2024-03-28T11:59:47Z
https://ejournal.unib.ac.id/alotropjurnal/oai
oai:ojs.localhost:article/2736
2017-12-24T15:19:17Z
alotropjurnal:ART
oai:ojs.localhost:article/2746
2017-12-24T15:19:18Z
alotropjurnal:ART
oai:ojs.localhost:article/3483
2017-12-24T15:19:15Z
alotropjurnal:ART
AKTIVITAS ANTIOKSIDAN METABOLIT SEKUNDER BAKTERI ENDOFIT AKAR TANAMAN Moringa oleifera L (Kelor)
Kuntari, Zeta
Sumpono, Sumpono
Nurhamidah, Nurhamidah
[ANTIOXIDANT ACTIVITY OF SECONDARY METABOLITE FROM ENDOFIT BACTERIA OF Moringa oleifera L (KELOR) ROOTS] The purpose of this research was aims to isolate and measure the ability of antioxidant activity from secondary metabolites produced by endophytic bacteria that grow in the live tissue root of Moringa oleifera L. (kelor). Endophytic bacteria were purified and cultured using a solid Murashige-skoog (MS) medium for 3 days at room temperature. Secondary metabolites were obtained by centrifugation process at a rate of 3000 rpm for 20 minutes. The bacterial fermentation process using Nutrient Broth (NB) medium for 72 hours with a shaker speed at 170 rpm . The suspension supernatant was extracted with a maceration method using 86% ethyl acetate, followed by vacuum rotary evaporator concentration at 40 ° C. The extract antioxidant activity test was performed using the DPPH (1,1-diphenyl-2-picrylhydrazyl) method using a UV-Vis spectrophotometer at 517 nm wavelength and ascorbic acid as standard. The result of DPPH test showed that the antioxidant activity of ethyl acetate extract of endophytic bacterial from root of M. oleifera L root has IC50 value at 315, 396 ppm. Based on these results, it can be concluded that the secondary metabolite extract of endophytic bacterial from M. oleifera L root classified as weak antioxidant (IC50> 250 ppm).
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3483
10.33369/atp.v1i2.3483
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3483/1856
oai:ojs.localhost:article/3507
2017-12-24T15:19:15Z
alotropjurnal:ART
STUDI PERBANDINGAN PEMBELAJARAN KOOPERATIF MENGGUNAKAN MEDIA CHEMICAL DOMINO CARD DAN FLASH CARD
Gusti, Nina
Bahar, Amrul
Handayani, Dewi
[COMPARISON STUDY OF COOPERATIVE LEARNING USING CHEMICAL DOMINO CARD AND FLASH CARD MEDIA] This study aims to measure differences in the results of chemistry learning between experimental class 1 classes that apply Chemical Domino Card learning media with experimental class 2 that apply Flash Card media at nomenclature of chemical compounds topics in class X IPA SMA Negeri 2 Kota Bengkulu at 2016 / 2017 academic year. Use of these two learning media is considered from the practicality, advantages, and effectivenes The type of research is a quasi experimental research with the population of all students of class X MIPA in SMA Negeri 2 Kota Bengkulu at 2016/2017 academic year , which a sample class is X MIPA E and X MIPA F. Implementation of research conducted by using two experimental class, X MIPA E which uses Chemical Domino Card media and class X MIPA F using Flash Card media. Data analysis used are mean value, homogeneity test, normality test and t test. The average value of posttest experimental class I for first and second meeting is 77,5 and 79,72, while for experiment class II is 86,94 and 88,61. Then t test is done by using difference of pretest and posttest value of student, which is obtained that both at first meeting and second t count> t table that is 2,44> 2,38081 (first meeting) and 2,81> 2,38081 (second meeting ). The results of this study indicate that there is a significant difference of student learning outcomes using Chemical Domino Card and Flash Card media on the nomenclature of chemical compounds
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
https://ejournal.unib.ac.id/alotropjurnal/article/view/3507
10.33369/atp.v1i2.3507
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
oai:ojs.localhost:article/3508
2017-12-24T15:19:15Z
alotropjurnal:ART
UJI FRAKSI ETIL ASETAT DAUN Peronema canescens TERHADAP Plasmodium berghei PADA Mus musculus
Ramadenti, Fuji
Sundaryono, Agus
Handayani, Dewi
[DETERMINATION OF ETHYL ACETATE FRACTION FROM Peronema canescens LEAF EXTRACT AGAINST Plasmodium berghei INFECTED Mus musculus] This study was conducted to identify secondary metabolite compounds contained in ethanol extract and ethyl acetate fraction from Peronema canescens leaf (sungkai) and to measure the effect of ethyl acetate fraction on anti plasmodium activity on Mus musculus infected by Plasmodium berghei. The ethyl acetate extract was obtained by maceration of leaves with 96% ethanol solution in3 days followed by fractionation by ethyl acetate for further test. 25 of male white M. musculus with the weight 20-40 g and 6-8 weeks old , divided into 5 groups with 5 head / group. Groups 3, 4 and 5 are treated and groups 1 and 2 are controls. The negative control will be given food and drink only, and for positive control group will be given chloroquine with dose 0,028, 0,056, and 0,084 g / KgBW. Development of levels of parasitemia were calculated by by observing a thin blood smear with giemsa staining under a microscope , observed until the parasitemia in the blood had reached 20-30% to be given a 3-day follow-up treatment, and then for the next 7 days after it was given treatment.. Anti-plasmodium activity test is determined by the number of parasitemia, percent growth and resistance of parasitemia in the blood. Data were analyzed by using one way anova method (? = 0,05 and 0,01). The results showed that the secondary metabolite compounds found in the ethyl acetate fraction of P.canescens leaf, namely alkaloids, flavonoids, tannins and phenolics and at a dose of 0.056 g / KgBW ethyl acetate fraction can inhibit the growth of parasitemia in the blood of M. musculus by 50 , 89% , with greater percentage of parasitemic inhibition compared with positive and negative control group.
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3508
10.33369/atp.v1i2.3508
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3508/1869
oai:ojs.localhost:article/3509
2017-12-24T15:19:16Z
alotropjurnal:ART
PERBANDINGAN HASIL BELAJAR SISWA MENGGUNAKAN MEDIA Daily ChemQuiz DAN PERMAINAN Ranking One Chemistry Quiz
Utari, Tiya Rurin
Bahar, Amrul
Handayani, Dewi
[COMPARISON OF STUDENTS LEARNING RESULT USING MEDIA Daily Chem Quiz AND GAMES Ranking One Chemistry Quiz] The aim of this research is to know the difference of students' chemistry learning result using Daily Chem Quiz (DC Quiz) and Ranking One Chemistry Quiz (ROC Quiz) media at class X MIPA in SMA Negeri 1 Bengkulu Tengah 2016 / 2017 academic year. This research is quasi research experiment. The independent variables are DC Quiz and ROC Quiz media, the dependent variable is the students' learning result and the control variable is the Think-Pair-Share (TPS) cooperative learning methods. The population is all students of class X MIPA at 2016/2017 academic year consisting of 4 classes, and to determine the sample is done by homogeneity test then taken by simple random sampling. The selected sample is the class X MIPA 3 as experiment class I using DC Quiz and class X MIPA 1 as experimental class II using RC Quiz . Data analysis used were mean score, normality test, homogeneity test, and t test. Based on posttest value of both class, it is known that the average value of posttest at experiment class I is 78.79 and at experiment class II is 84,77. The result of data analysis shows that the data is normally distributed and has homogeneous variance and obtained t count> ttabel (2,47> 2,39). The results of this study indicate that H0 rejected and Ha accepted in other words there is a significant difference between student learning outcomes using DC Quiz media and RC Quiz media.
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3509
10.33369/atp.v1i2.3509
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3509/1870
oai:ojs.localhost:article/3510
2017-12-24T15:19:16Z
alotropjurnal:ART
ANALISIS KAPASITAS ADSORPSI SILIKA DARI PASIR PANTAI PANJANG BENGKULU TERHADAP PEWARNA RHODAMINE B
Madina, Fitri Esa
Elvia, Rina
Candra, I Nyoman
[ANALYSIS OF SILICA ADSORPTION CAPACITY FROM THE SAND OF PANTAI PANJANG BENGKULU AGAINST RHODAMINE B DYES ] This research was aimed to study the adsorption capacity of synthetic silica on Rhodamine B dyes. Synthetic silica was obtained from the sand of Pantai Panjang Bengkulu by alkali fusion method using KOH at 360 °C for 4 hours in furnace to obtain potassium silicate crystals (K2SiO3). The crystals were then added 500 mL aqua DM, stirred and sterilized for 24 hours folloed by filtered. The filtrate was dropped with 10 M HCl solution until the pH of filtrate solution reached at 1 to 2 and formed a silent white gel for 24 hours. Moreover, the gel was filtered with filter paper and washed with aqua DM until pH is neutral and free from KCl, and dried in an oven at 60 °C for 18 hours. The obtained silica powder is then smoothed with mortar and weighed. The adsorbent of Rhodamine B dyes using the synthetic silica powder was performed on pH variation at 2, 3, 4, 5, 6, and 7 , and variation of contact time at 10, 20, 30, 40, 50, and 60 min. The results showed that the optimum condition of adsorption of Rhodamine B by silica from Pantai Panjang sand occured at optimum pH 2 and optimum contact time 20 minutes; with adsorption capacity of 4.95 mg / g and 4.79 mg/g; and with adsorption efficiency of 99.00% and 95.89%.
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3510
10.33369/atp.v1i2.3510
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3510/1871
oai:ojs.localhost:article/3511
2017-12-24T15:19:16Z
alotropjurnal:ART
HUBUNGAN ANTARA SARANA LABORATORIUM TERHADAP KETERAMPILAN PROSES SAINS SISWA KELAS XI MIPA 5 DI SMA NEGERI 3 KOTA BENGKULU
Simanjuntak, Nola Desti Pratiwi
Rohiat, Salastri
Elvinawati, Elvinawati
[RELATIONSHIP BETWEEN LABORATORY FACILITIES AND STUDENT PROCESS SKILLS AT CLASS XI MIPA 5 IN SMA NEGERI 3 KOTA BENGKULU] The purpose of this study was to determine the relationship of laboratory facilities to students' science process skills in the laboratory. This research is a correlational research. The population in this study is all students of class XI MIPA 5 academic year 2016/2017 in SMA Negeri 3 Kota Bengkulu. This research uses total sampling technique so that the entire population is used as research sample. The independent variable (x) in this research is chemical laboratory equipment and dependent variable (y) is the science process skill of students in laboratory of SMA Negeri 3 Kota Bengkulu.. Data collection in this research using questionnaire instrument with 30 items and observation sheet with 15 items . Technique of data analysis using expert validity test, questionnaire analysis, observation analysis of science process skill, normality test, linearity test, correlation analysis and hypothesis test. Data analysis using the help of SPSS 16 program. The results of data processing correlation coefficient (r) obtained that is equal to 0.387 at 5% significance level. . The result of hypothesis test shows that Ha is accepted which means there is a significant correlation between laboratory facilities and science process skill of students in laboratory on chemistry learning of students of class XI MIPA 5 SMA Negeri 3 Kota Bengkulu academic year 2016/2017
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3511
10.33369/atp.v1i2.3511
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3511/1872
oai:ojs.localhost:article/3515
2017-12-24T15:19:16Z
alotropjurnal:ART
ANTIOXIDANT AND CYTOTOXICITY PROPERTIES OF ETHYL ACETATE FRACTIONS OF Pandanus tectorius FRUIT AGAINST HELA CELL LINES
Musa, Noor Suryani
Ramli, Nadia Madiha
Saidin, Jasnizat
Andriani, Yosie
Antioxidant agents play an important role in inhibiting free radical molecules activity thus preventing the cancer disease. This current study aimed to evaluate antioxidant and cytotoxicityproperties of ethyl acetate fractions of Pandanustectorius fruit extract on HeLa cell lines. The radical scavenging activity was measured by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) method. The cytotoxicity was measured by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay against human HeLa cell lines. The result showed that all ethyl acetate fractions of P. tectoriusfruit had high antioxidant property. All of seven fractions of the ethyl acetate extract were observed based on the IC50 value and had high DPPH free radical scavenging activity with the IC50 value range from 0.3 to 2.4 mg/ml compare to positive control,quercetin(IC50= 0.2 mg/ml). Based on the DPPH free radical scavenging activity (antioxidant property), three of seven fractions were chosen for the MTT assay to analyze their cytotoxic activity as anticancer potential agent against HeLa cell lines.From MTT result, one of tree fractions were showed cytotoxicity activity against HeLa cell lines with the IC50value is 12 µg/ml (less than 30 µg/ml), while anothertwo fractions was found not cytotoxic against HeLa cell lines.It is clearly indicated that P. tectoriusfruit has a very good potential as antioxidant and anticancer agent.
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3515
10.33369/atp.v1i2.3515
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3515/1873
oai:ojs.localhost:article/3525
2017-12-24T15:19:17Z
alotropjurnal:ART
HUBUNGAN PERSEPSI SISWA KELAS X MIPA DI SMA NEGERI SEKOTA BENGKULU TAHUN AJARAN 2016/2017 TENTANG VARIASI GAYA MENGAJAR GURU DENGAN HASIL BELAJAR KIMIA
Lestari, Indah Ayu
Amir, Hermansyah
Rohiat, Salastri
[RELATIONS OF STUDENTS PERCEPTION AND VARIATION TEACHING STYLE WITH CHEMISTRY LEARNING OUTCOMES AT CLASS X MIPA IN SMA NEGERI KOTA BENGKULU IN 2016/2017 ACADEMICS YEAR ] In teaching and learning activities at school, often faced with the problem of low student learning outcomes. Student learning outcomes is one indicator to measure success in the implementation of learning process. Student learning outcomes are influenced by several factors, both external and internal factors. One of the internal factors that can affect student learning outcomes is perception. The object of perception here is the variation of the teacher's teaching style. The purpose of this study is to obtain data about students' perceptions about the variation of teaching style of chemistry teacher and student chemistry learning outcomes in SMA Negeri Kota Bengkulu academic year 2016/2017. Polpulation in this research is all students of class X of MIPA in State Senior High School of Bengkulu which amounted to 1620 students. The technique of determining the sample that will be used by the researcher is Proportional Random Sampling technique and the sample is 324 students. Data analysis used in this research is descriptive analysis, normality test, linearity, correlation and hypothesis test. Based on the analysis, the correlation coefficient value is 0.232 > 0.11 (r count t > r table), and t count > t table (4,312 > 1,967), indicating that there is a significant positive correlation between students' perception about teacher teaching style variation and student's chemistry learning result.
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3525
10.33369/atp.v1i2.3525
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3525/1879
oai:ojs.localhost:article/3529
2017-12-24T15:19:17Z
alotropjurnal:ART
SKRINING FITOKIMIA DAN AKTIVITAS ANTIOKSIDAN BEBERAPA FRAKSI DARI KULIT BATANG JARAK (Ricinus communis L.)
Agustina, Wulan
Nurhamidah, Nurhamidah
Handayani, Dewi
[PHYTOCHEMICAL SCREENING AND ANTIOXIDANT ACTIVITY OF SOME FRACTIONS FROM BARK OF CASTOR (Ricinus communis L.)]. The Phytochemical screening was conducted to determine secondary metabolites found in the bark of castor (Ricinus communis L.).The test results of phytochemical screening that has been done presence of phenolic, flavonoids, alkaloids, saponins, and terpenoids. Extraction is done by maceration using ethanol 96%. Tests performed on the fraction of the antioxidant activity of ethanol, ethyl acetate, n-hexane, and ascorbic acid as compared to using DPPH. The results of measuring the antioxidant activity using Uv-Vis Spectrophotometer IC50 values obtained succession namely fraction of ethanol, ethyl acetate, n-hexane, and ascorbic acid, 33,38, 24,38, 289, 05 and 12, 48 ppm. Fraction of ethanol and ethyl acetate has a very strong antioxidant activity due IC50<50 ppm while the n-hexane fraction very weak antioxidant activity. Phenolic and flavonoids the bark of castor that can be potentially as antioxidants
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3529
10.33369/atp.v1i2.3529
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3529/1880
oai:ojs.localhost:article/3530
2017-12-24T15:19:17Z
alotropjurnal:ART
PERBANDINGAN HASIL BELAJAR SISWA DENGAN METODE INDEX CARD MATCH DAN BAMBOO DANCING
Novela, Moli
Bahar, Amrul
Amir, Hermansyah
[COMPARISON OF STUDENT LEARNING OUTCOMES BEETWEN INDEX CARD MATCH AND BAMBOO DANCING LEARNING METHOD] In the learning process teachers often use lecture methods so that students tend to only accept what is given by teachers and many students who feel chemistry lessons are difficult and confusing lessons. This results in low student learning outcomes. One effort that can be done by using the teacher method is varied, one of which is the method of Index Card Match and Bamboo Dancing. This research type is experiment. The population is all students in class X MIPA SMA Negeri 2 Kota Bengkulu as many as 216 students. The sample selection was done by homogeneity test with the result obtained by class X MIPA C (experimental class I) which applied Index Card Match method and X MIPA D (experiment II class) applying Bamboo Dancing method. Data analysis used is normality test, homogeneity test and t test. In this study the results of learning are seen the value of the difference between the average pretest and posttest, where obtained for class X MIPA C is 53.75 and class X MIPA D is 45.55. Then t test is obtained where t test t > t table (3,76 > 2,38), so it can be concluded that there is a significant difference between student learning result using Index Card Match method with Bamboo Dancing on chemical compound nomenclature material.
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3530
10.33369/atp.v1i2.3530
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3530/1881
oai:ojs.localhost:article/3534
2017-12-25T22:48:00Z
alotropjurnal:ART
UJI BIOFUEL HASIL PERENGKAHAN METIL ESTER DARI LIMBAH CAIR PABRIK MINYAK KELAPA SAWIT DENGAN KATALIS MoNi/HZ
Sari, Dian Kartika
Sundaryono, Agus
Handayani, Dewi
[CONVERSION OF LIQUID WASTE OIL PALM OIL FACTORY BECOME BIOFUEL WITH MONi / HZ CATALYST] This study aims to produce biofuel from liquid waste oil PMKS with worditik cracking using catalystMoNi / HZ. This study involves the preparation of a catalyst performed by means of a separate impregnation, this impregnation lasting for 12 hours. The next stage of sample preparation includes heating, filtering, degumming, bleaching and ALB determination, followed by the production of methyl esters through esterification and transesterification processes. Then the obtained methyl ester was cracked using a catalyst for 2 hours at 380 °C and followed by distillation of the product for 2 hours at 380 °C, followed by distillation step at 380 °C to obtain methyl ester. The physical characteristics of biofuel resulting from the catalytic cracking reaction of the methyl ester using the MoNi / HZ catalyst of the PMKS wastewater include the acid number 1.92 mg KOH / g, density 0.803 g/cm3, kinematic viscosity 1,113 cSt, a pour poin of 0oC and fog poin at 1,43 oC. Biofuel resulting from catalytic cracking using this MoNi / HZ catalyst of very high biofuel acid numbers can be used in areas that have a cold climate. the biofuel viscosity of the experimental results has not matched the viscosity of gasoline or kerosene, so it can not be used as fuel equivalent to gasoline and kerosene with the composition of 100% biofuel density from biofuel is still slightly above gasoline and kerosene
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3534
10.33369/atp.v1i2.3534
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3534/1882
oai:ojs.localhost:article/3535
2017-12-25T23:10:23Z
alotropjurnal:ART
IMPLEMENTASI KURIKULUM 2013 BAGI GURU KIMIA DI SMA NEGERI SEKOTA BENGKULU
Clorawati, Ahaky Roza
Rohiat, Salastri
Amir, Hermansyah
[IMPLEMENTATION OF 2013 CURRICULUM FOR CHEMICAL TEACHERS IN SMA Negeri AT BENGKULU ] This research is a description research conducted from SMA Negeri 1 to SMA Negeri 10 Kota Bengkulu for chemistry teacher in 2016/2017 academic year. This study aims to describe the implementation of the 2013 curriculum for chemistry teachers in the SMA Negeri in Bengkulu City. The population of this research is all the chemistry teachers who teach in ten SMA Negeri in Bengkulu consisting of 42 teachers. Samples were taken by proportional random sampling technique as much as 20%, but the samples taken are teachers who have implemented the curriculum 2013. Obtained final sample of 26 teachers. In this study, a questionnaire was used to collect data, including indicators of the overall implementation of the curriculum, scattered on 53 points of statement, using Likert Scale with a score of 1 to 4. which was then processed using Statistical Product Service Solution(SPSS)16 program. The results showed that the implementation of the 2013 curriculum, the average percentage of teachers who have implemented is 66.67% with the category mostly implemented. Specifically that is, planning obtained at 65,385%, implementation obtained at 57,692%. and assessment of learning result obtained at 76,923% with category mostly executed.
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3535
10.33369/atp.v1i2.3535
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3535/1883
oai:ojs.localhost:article/3539
2017-12-26T16:30:46Z
alotropjurnal:ART
ANALISIS Hg2+ DENGAN MENGGUNAKAN NANOPARTIKEL PERAK (NPP) SEBAGAI INDIKATOR KOLORIMETRI DENGAN METODE SPEKTROFOTOMETRI
Adriansyah, Renaldi
Firdaus, M. Lutfi
Elvinawati, Elvinawati
[ANALYSIS OF Hg2+ USING NANOPARTIKEL METAL (NPP) AS A COLORIMETRY INDICATOR WITH SPECTRUMFOTOMETRY METHOD]. Mercury (Hg) is heavy metal with high toxicity that often pollutes the aquatic environment. Concentration of Hg (II) ions is usually determined by using ICP-MS and AAS but because its price relatively expensive an alternative is needed to determine concentration of Hg. Therefore, the purpose of the study was to conduct synthesis of silver nanoparticles (NPP) by utilizing extract of Phyllanthus acidus ceremin fruit as a colorimetric indicator for alternative analysis concentration of Hg metal in digital image. Bio NPP used as a colorimetric indikator of Hg metal in this study was synthesized at optimum condition. The optimum condition of Bio NPP synthesis was obtained on the ratio of extract volume of P. acidus fruit and AgNO3 1: 1 and the duration of exposure to sunlight for 1 hour.The formed Bio NPP knew to be selective against Hg (II) metal ions characterized by the change of Bio NPP color from brownish yellow to clear. In addition, the Bio NPP that has been synthesized in this study can be used as a colorimetric indicator of Hg metal analysis using spectrofotometer uv-vis with detection limit 7.56 ppb.
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3539
10.33369/atp.v1i2.3539
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3539/1885
oai:ojs.localhost:article/3546
2017-12-27T13:49:48Z
alotropjurnal:ART
PERBANDINGAN HASIL BELAJAR KIMIA MODEL PEMBELAJARAN PROBLEM BASED LEARNING DAN THINK TALK WRITE
Wahyuni, Nadya Dirma
Bahar, Amrul
Handayani, Dewi
[COMPARISON FROM LEARNING OUTCOMES OF PROBLEM BASED LEARNING MODELS AND THINK TALK WRITE MODELS ] Each learning model has advantages and disadvantages in every process.This research intent to know the difference student studying result on chemical learning among brazes that utilize learning model Problem Based Learning (PBL) with class that utilize learning model Think is Write's Talc (TTW) on jurisdictional material – chemical base law at class X SMA Negeri 10 Kota Bengkulu's . This research constitute quasi's experiment. Students learned result on observational it is seen from pretest's point and posttest difference. On class that utilize Problem Based Learning (PBL) model , increasing average value from student kognitiv as big as 49,23. Meanwhile class that utilize Think is Write's Talc (TTW) model , increasing average value learned student kognitiv as big as 56,33. Hypothese was tested by use of t test (? = 0,01) to result at t test = 3,53 < t table = 2,38. Research result to point out that are distinctive result that significan among between class that utilize Problem Based Learning (PBL ) model and class that utilize Think is Write's Talk (TTW) model.
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3546
10.33369/atp.v1i2.3546
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3546/1892
oai:ojs.localhost:article/3547
2017-12-27T23:15:58Z
alotropjurnal:ART
AKTIVITAS ANTIOKSIDAN DAN ANTIBAKTERI EKSTRAK DAUN Strobilanthes crispus Bl (Keji Beling) ) TERHADAP Staphylococcus aureus DAN Escherichia coli
Adibi, Sukaina
Nordan, Hendry
Ningsih, Septri Nurjaya
Kurnia, Moga
Evando, Evando
Rohiat, Salastri
[ANTIXOXIDANT AND ANTIBACTERIA ACTIVITIES OF Strobilanthes crispus Bl (Keji Beling) EXTRACT AGAINST Stapylococcus Aureus AND Escherichia coli] Strobilanthes crispus Bl (Keji Beling) is one of herbs that has been used for the treatment of several types of diseases such as kidney stones, gall stones, diabetes, cholesterol, tumors and others. The purpose of this study was to determine the value of antioxidant activity (IC50) and antibacterial activity of ethanol extract of leaf vermicelli against Staphylococcus aureus and Escherichia coli bacteria. Antioxidant test was performed using DPPH method and vitamin C was used as standard. While the antibacterial activity test done by paper disc method. Amphicillin is used as a positive control and aquades as a negative control. Ethanol extract of leaf vermicelli able to counteract free radical of DPPH with IC50 value that is: 102.85 ppm and IC50 value from vitamin C as comparative solution equal to 19.268 ppm. The results of antibacterial inhibition test of ethanol extract of vile leaf on S. aureus bacteria with extract concentration of 20% (0 mm), 40% (2.5 mm), 60% (3.25 mm), and 80% (4.75) were included Weak and 100% (5.75 mm) including Medium, and E.coli antibacterial inhibition in the extract con- tacts of 20% (0 mm), 40% (2 mm), 60% (2.25 mm), 80% (4.25 mm) were weak, and 100% (5.25 mm ) including moderate. So it is known that the extract of ethanol leaves vile at 100% concentration can inhibit the growth of S. aureus bacteria and E. coli bacteria characterized by the formation of the largest clear zone diameter at the concentration. But the strength of its bacteria is still not effective to inhibit the growth of both test bacteria.
University of Bengkulu
2017-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/3547
10.33369/atp.v1i2.3547
ALOTROP; Vol. 1 No. 2 (2017)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/3547/1893
oai:ojs.localhost:article/4581
2018-05-23T07:16:01Z
alotropjurnal:ART
PEMANFAATAN EKSTRAK AIR BUAH Flacourtia inermis Roxb. (LOBI-LOBI) SEBAGAI PENGAWET IKAN LAUT
Pribadi, Ade
Nurhamidah, Nurhamidah
Elvinawati, Elvinawati
[THE UTILIZATION OF Flacourtia inermis Roxb. (LOB-LOBI ) FRUIT WATER EXTRACTS AS A MARINE FISH PRESERVATIVE] This research aims to determine the magnitude of the concentration and the length of time the optimum soaking water extracts of fruit Flacourtia inermis Roxb. (lobi-lobi ) as well as measuring its potential for use as a preservative in marine fish. Sample marine fish used is Kerapu Macan (Epinephelus fuscogultatus). The concentration of water extract from the fruit of F.inermis Roxb is at levels at 10, 20, 30 and 40% with soaking time each at 1, 2 and 3 hours for any variation of the concentration. Observation of the level of the fish freshness is done with a variety of storage time of 12, 18, and 24 hours at room temperature to any variation of the concentration of extract and soaking time. The parameters used in determining the level of the freshness of the sample fish is a rate of Total Volatile Bases (TVB), moisture content, and pH. The results of the research done indicate that extracts water from the fruit of F.inermis Roxb L are potential for use as a preservative of marine fish based on the values of pH and the levels of TVB. The most optimum concentration and soaking time in Kerapu Macan fish preserve during its storage was soaking with a concentration of 30% for 1 hour, i.e., able to withstand the pace of the decline of the quality of the Kerapu Macan sample for 18 hours at room temperature: with the pH 6.7 and fish TVBvalue at 29.4 mgN/100 g.
University of Bengkulu
2018-05-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4581
10.33369/atp.v2i1.4581
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4581/2483
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4582
2018-05-23T08:24:32Z
alotropjurnal:ART
MENGGUNAKAN MEDIA INTERNET DOCS.GOOGLE PADA POKOK BAHASAN REAKSI REDOKS KELAS X IPA DI SMAN 4 KOTA BENGKULU
Parade, Aang
Handayani, Dewi
Sumpono, Sumpono
[USING THE DOCS. GOOGLE INTERNET MEDIA ON THE REDOX REACTION SUBJECT IN CLASS X IPA SMAN 4 BENGKULU CITY ] This research aims to know the results of learning: students in the class who are not given the preparation of learning at home, knowing the results of the teaching of students in a given grade of preparatory study at home using internet media, knowing the Docs. Google the difference in the results of student learning in the classroom are not given preparation home study with the results of a survey of students in a provided a homework preparatory sign Docs. Google internet media. The methods used in this research was quasi-experimental research is the entire population with grade X IPA SMAN 4 city of Bengkulu, Sample research, i.e., class experiments and classroom control. The results of the study in this research result of students pretest and posttest. Based on the results of the research conducted in mind that there is a significant difference between the results from student learning in the classroom are not given preparation home study with the results of a survey of students in a given a homework preparation home study using internet media Docs. Google via t-tests using SPSS 16 program. The learning outcomes of students in a given grade of preparatory education at home using Google Docs. Indicates the average rating of 77.0 while learning results of students in the class who are not given a homework preliminary with the average value of 68.6. Student Learning Outcomes in a given class homework preparation using Docs. Google may provide better results on the subject of redox reactions.
University of Bengkulu
2018-05-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4582
10.33369/atp.v2i1.4582
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4582/2484
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4588
2018-05-24T08:17:28Z
alotropjurnal:ART
KARAKTERISASI ISOTERM ADSORPSI DARI ION LOGAM BESI (Fe) PADA TANAH DI KOTA BENGKULU
Apriyanti, Hesti
Candra, I Nyoman
Elvinawati, Elvinawati
[CHARACTERIZATION OF THE ADSORPTION FROM IRON METAL IONS ISOTHERM ON THE SOIL IN BENGKULU CITY] Level of micronutrient elements Fe takes part in determining the fertility rate of agricultural land. Continuous oxidation of Fe the soil will cause soil poisoning, due to the soil saturated in absorb of Fe. This research aims to determine the characteristics of the soil, adsorption and its ability in absorption isotherm on Fe metal. Soil samples were taken from the farm in the city of Bengkulu. The characteristics of the soil tested, i.e., water content, pH, and soil type. Adsorption isotherm type is a determination as Langmuir or Freundlich isotherm. Soil sample after it is dried and cleaned and then milled and sieved at 100 mesh sieve. Moisture content is measured by dried in an oven for 24 hours and the measurement of the difference between the initial and the final weight of the soil. Determination of soil pH is measured by the pH meter on the CaCl2, and soil type is determined by calculating the percentage of sand, silt, and clay from the soil. Maximum adsorption capacity is determined from Fe adsorption isotherm after getting the pH, the weight of adsorbent and optimum contact time. Adsorption Isotherm was determined by adsorption of aqueous Fe variation at the concentration of 2.5; 5; 10; 15; 20; and 25 ppm on optimum pH and weight, and stirred at an optimum contact time, then filtered and measured its absorbance with UV-Vis spectrophotometer. Results of research results in the form of moisture content average 23.5%, soil pH value at 5 and soil type, i.e., dusty clay with the dominant form of Isotherm adsorption is a Freundlich isotherm, and the capacity of soil in adsorbing of iron on this research obtained is amounting to 45.6.
University of Bengkulu
2018-05-24
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4588
10.33369/atp.v2i1.4588
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4588/2485
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4600
2018-05-25T07:12:11Z
alotropjurnal:ART
PENERAPAN MODEL PEMBELAJARAN INKUIRI DENGAN MEDIA DART BOARD UNTUK MENINGKATKAN HASIL BELAJAR KIMIA Di KELAS XI IPA 1 SMA NEGERI 9 KOTA BENGKULU TAHUN AJARAN 2016/2017
Wulandari, Defrilina Sri Eka
Bahar, Amrul
Elvinawati, Elvinawati
[THE APPLICATION OF INQUIRY LEARNING MODEL WITH DART BOARDMEDIA TO IMPROVE THE STUDIED RESULTS OF CHEMISTRY IN CLASS XI IPA 1 SMA NEGERI 9 CITY OF BENGKULU AT 2016/2017 ACADEMIC YEAR] This research aims to improve the learning outcomes and student activity model of learning by implementing a inkuiri dart board with media in class XI IPA 1 SMA Negeri 9 Bengkulu city at 2016/2017. Academic year. This research is a class action research. This research was conducted in three cycles consisting of 4 stages each namely planning, implementation, observation, and reflection. The subject of this research is the whole grade X IPA 1 SMA N 9 Bengkulu city on 2016/2017 academic year. From the results, it can be concluded that the process of learning to apply inquiry learning models by using a Dart Board media proved can improve the activity and outcomes of study chemistry grade XI IPA 1 SMA Negeri 9 Bengkulu city on 2016/2017 academic year. It can be seen from the average value of students in Ist cycle are 61.61, classical absorption 77.02% and learning of classical completeness at 19.35%..In Iind Cycle obtained an average score of students amounted to 71.29; absorption of conventional 79.21% and completeness studied conventional 35.48%. In IIIth cycle received an average rating of students at 84.51; absorption of conventional 84.51% and completeness studied classical 90.32%.. For the entire sequence of an increase in the activity of the students which can be seen from the mean value – 1st cycle averages of 22.5, 2nd cycle at 25; and in 3th cycle at 29.
University of Bengkulu
2018-05-25
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4600
10.33369/atp.v2i1.4600
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4600/2487
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4601
2018-05-25T08:34:59Z
alotropjurnal:ART
AKTIVITAS FRAKSI ETANOL DARI EKSTRAK DAUN Peronema canescens TERHADAP TINGKAT PERTUMBUHAN Plasmodium berghei
Prasiwi, Dhea
Sundaryono, Agus
Handayani, Dewi
[THE ACTIVITY OF THE Peronema canescens LEAVES ETHANOL EXTRACTS FRACTION AGAINST Plasmodium berghei GROWTH RATE ] The purpose of this research was to identify the secondary metabolites of compounds contained in the fraction of ethanol from leaves of Peronema canescens (Sungkai) as well as to measure the level of activity of ethanol fraction antiplasmodium leaf P.canescens against the male mice (Mus musculus) infected with Plasmodium berghei which is parasitic hemaprotozoa that can cause malaria in rodents such as rats and mice as well as molecular similarity with the parasite Plasmodium. falciparum that causes malaria in humans. The methods used in this study i.e. in maceration extraction methods to attract secondary metabolite compounds from the leaves of P.canescens followed by oil bath method to get a fraction of ethanol with the purpose of separating polar compounds from a mixture of secondary metabolite compounds contained in the sample leaf P.canescens. Assay activity against antiplasmodium males mice infected with P. berghei is done by dividing into the 5 mice group treatment i.e. Group K (-) that are quads, group K (+) given kloroquin anti malarial drug, and P1, P2, P3, which each group was given a dose of ethanol fraction from leaves of P. canescens with each dose of 0.028 (P1); 0.056 (P2), and 0.0084 g/kgBB (P3).The results of research conducted showed that administering ethanol fraction from leaves of P. canescens antimalarial activity can increase with very real on the best dose of kg BB 0084 g i.e. with the percentage inhibition of 54.06%.
University of Bengkulu
2018-05-25
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4601
10.33369/atp.v2i1.4601
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4601/2490
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4628
2018-05-27T08:47:17Z
alotropjurnal:ART
ANALISIS KEMAMPUAN BERPIKIR KRITIS MATA PELAJARAN KIMIA PADA SISWAKELAS XI IPA SMAN 1 KEPAHIANG
Yunita, Selly
Rohiat, Salastri
Amir, Hermansyah
[ANALYSIS OF THE CRITICAL THINKING ABILITY FROM CHEMICAL SUBJECTS IN STUDENTS OF CLASS XI IPA SMAN 1 KEPAHIANG] This research aims to know the critical thinking ability of students. Type of this research is descriptive research using quantitative methods. This research was carried out in SMA Negeri 1 Kepahiang on September 2 to 8 may in 2017. The population in this research is the entire class XI IPA are registered on the even-numbered school year 2016/2017 semester. As the samples are taken at class XI IPA 6 of 32 participants. Data collection is done with the test in the form of reserved descriptions as much as 10 round the whole includes indicators of critical thinking from the taxonomy of Bloom that is level (C2) understand (C3), apply (C4), analyzing and evaluating (C5). Test results obtained from the analysis of results the percentage of students with the ability to answer a question of thinking very critically at 15,6%, quite critical at 53,2 %, and less critical at 31,2 %, with an average value of 61.81. From the average of the values obtained showed that students who have average value included in the category of being. Based on the analysis of the data collected can be inferred levels of critical thinking ability of the students in class XI IPA 6 SMA Negeri 1 Kepahiang at school 2016/2017 academic year can be grouped in a category group are of 53,2 %, middle , 15,6 % at high group and 31,2 % at low groups. From the results, it can be concluded that overall students in grades at XI IPA 6 SMA Negeri 1 Kepahiang even 2016/2017 academic year with the ability to enough think critically.
University of Bengkulu
2018-05-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4628
10.33369/atp.v2i1.4628
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4628/2521
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4630
2018-05-28T07:41:30Z
alotropjurnal:ART
POTENSI EKSTRAK METABOLIT SEKUNDER Eugenia uniflora L. SEBAGAI BAHAN PENGAWET TAHU
Tria, Genesis
Nurhamidah, Nurhamidah
Amir, Hermansyah
[POTENTIAL OF Eugenia uniflora L SECONDARY METABOLITES EXTRACT AS A TOFU PRESERVATIVE]. The purpose of this research is to know the secondary metabolite compounds from the Eugenia uniflora L (Dewandaru) fruit extracts , as well as to measure the potential of water extract from the fruit of E. uniflora L for the use in the tofu preserve as well as measure the impact of the addition of water extract of the fruit of E. uniflora L against moisture, pH, protein on tofu. The process of preserving test against tofu on the research done by soaking time at 2, 3 and 4 hour with each variation of the concentration of extract at 10, 15 and 20% as well as the observation time at 24 and 48 hours for each treatment.The result of the test water extract of the fruit of the phytochemical profile E. uniflora L showed the content of alkaloids, flavonoids, phenolic , saponins and steroid compounds. Test results from the granting of water extract from the fruit of E.uniflora L in the preserve of tofu with the variation of concentration and soaking time is proven to affect the value of water content, pH, and protein on tofu that was tested.The results of the research done indicate that the granting of a water extract of the fruit of E.uniflora L proven useful to be used as a natural preservative for tofu at 24 hours with a 20% concentration and a soaking time at 2 and 3 hours. From the results, it can be concluded that water extracts from the fruit of E.uniflora L. potential to be used as a natural preservative for tofu.
University of Bengkulu
2018-05-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4630
10.33369/atp.v2i1.4630
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4630/2525
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4646
2018-05-29T21:02:00Z
alotropjurnal:ART
SINTESIS DAN KARAKTERISASI XEROGEL HASIL KOPRESIPITASI DARI PASIR PANTAI PANJANG BENGKULU
Meyori, Finni
Elvia, Rina
Candra, I Nyoman
[SYNTHESIS AND CHARACTERIZATION OF XEROGEL RESULTS OF COPRECIPITATION OF LONG BEACH BENGKULU BEACH]. This research aims to synthesize and characterization to Xerogel which synthesizes from Pantai Panjang sands Bengkulu. The method used for this study to synthesizes Xerogel is to use the coprecipitation method. Qualitative XRF test against raw sand materials that were used show that the content of the element is the most significant element of Si. The first stages of the synthesis of Xerogel is a purification of the sand sample.. Xerogel synthesis is carried out in two phases, namely the manufacture of aqueous solutions of Sodium Silicate and continued with the formation of a gel. The production of Sodium Silicate solution is done using the NaOH concentration at 5, 6 and 7 M. Gel formation process is done by adding a solution of HCl 10 M into the solution of Sodium Silicate, followed by process of filtration, washing and drying in the oven. The results showed that the optimum conditions of synthesis of Xerogel obtained using 6 M NaOH , with a yield obtained is amounting at 0.8%. The results of the test by XRD shows that the silica crystal structure on Xerogel are amorphous-shaped. SEM-EDS test results show that the acquired Xerogel on research has a smooth texture and size is not homogeneous with the highest content of elements are the elements Si and O. PSA test shows that particle size in Xerogel an average at 191.4 nm.
University of Bengkulu
2018-05-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4646
10.33369/atp.v2i1.4646
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4646/2536
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4672
2018-05-31T22:11:39Z
alotropjurnal:ART
PREPARASI DAN KARAKTERISASI MIKROKRISTALIN SELULOSA (MCC) BERBAHAN BAKU TANDAN KOSONG KELAPA SAWIT (TKKS)
Effendi, Fepri
Elvia, Rina
Amir, Hermansyah
[PREPARATION AND CHARACTERIZATION OF MICROCRYSTALLINE CELLULOSE (MCC) MADE FROM EMPTY PALM OIL BUNCHES (TKKS)] Empty Palm bunches (TKKS) is solid waste from industrial processing of oil palm (Elaeis guineensis Jacq) that have a high cellulose content. This research aims to synthesize Microcrystalline Cellulose (MCC) from TKKS and determine the characteristics of the MCC produced. The manufacturing process begins with the MCC delignifikasi multistage pulping TKKS using mixed of 3.5% HNO3 and NaNO2 in temperatures of 90 ?C for 2 hours, followed by heating of a mixture of 2% NaOH and Na2SO3 2 % at temperature 50?C for 2 hours. The second stage of the lignification process is done using NaOH 17.5 %, followed by hydrolysis towards ?-Cellulose lignification results with heating in the aqueous solution of HCl at concentrations of 3, 3.5 and 4 M for 30, 45 and 60 minutes. From the results obtained from the hydrolysis of the optimum yield of 80.73 %, i.e., MCC that use concentration of HCl 3 M for 30 minutes. MCC produced then analyzed using FTIR, XRD, and PSA. FTIR absorption for MCC results showed an of waves number on a 3375.43 cm-1 and 2899,01cm-1, indicating the presence of hydroxyl OH and CH.The results of the analysis with the PSA suggests that MCC has generated a measure of particle diameter 0.5281 µm. Using XRD analysis results that MCC has a degree of crystallinity of 86,79 %. And the results of testing the content of carbohydrates in MCC produced shows levels of carbohydrates of 88.36 %.
University of Bengkulu
2018-05-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4672
10.33369/atp.v2i1.4672
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4672/2563
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4689
2018-06-02T09:18:18Z
alotropjurnal:ART
PENERAPAN MODEL DISCOVERY LEARNING DENGAN MENGGUNAKAN MEDIA VIDEO UNTUK MENINGKATKAN AKTIVITAS BELAJAR DAN HASIL BELAJAR SISWA KELAS XI IPA 1 SMAN 1 KOTA BENGKULU
Medianty, Sitti Utami
Bahar, Amrul
Elvinawati, Elvinawati
[APPLICATION OF DISCOVERY LEARNING MODEL BY USING VIDEO MEDIA TO INCREASE LEARNING ACTIVITIES AND STUDENT LEARNING RESULT CLASS XI IPA 1 SMAN 1 BENGKULU CITY]. The research has goals to improve the activity and learning outcomes chemistry at XI IPA 1 class in SMA Negeri 1 Bengkulu that consist of 30 students: 23 girls and 7 boys. This study is research of class action on thermochemistry subjects by discovery learning model. This research consist three cycle on four stage: planning, action, absorption, and reflection. The data collected using test and non test that consist of post test and observation sheet of activity teacher and student. The data processed using quantitative simple analysis techniques: average score of observation sheet of activity teacher and student, average score, absorption percentage clasical, andclasssical learning completness percentage. From the reseult, we can conculded that chemistry learning process applying discovery learning model using video can improve activity and outcomes learning chemistry student. It can be see from the average score of students. In the first cycle is 69.33 in which the percentage of classical absorption is 86.67 and classical learning completeness is 66.67. The average score of the second cycle is 71,33 in which the percentage of classical absorption is 89.17 and classical learning completeness is 73.33. The students’ average score of the third cycle is 81.33 in which the percentage of classical absorption is 90.37 and classical learning completeness is 86.67. The teacher’s activities of the learning process in the first cycle get average score 26.5 and it is good category, the second cycle is 27.5 and it is good category, the third cycle is 30 and it is good category too. Meanwhile, the student’s activities in the first cycle get average score 22.5 and it is good category, the second cycle is 25 and it is a good category, the third cycle is 27 and it is good category.
University of Bengkulu
2018-06-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4689
10.33369/atp.v2i1.4689
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4689/2575
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4709
2018-06-05T06:30:05Z
alotropjurnal:ART
PENENTUAN PARAMETER ADSORPSI SILIKA SINTETIK DARI CANGKANG KELAPA SAWIT TERHADAP KANDUNGAN AMMONIUM PADA LIMBAH CAIR TAHU
Karimullah, Rizki
Elvia, Rina
Amir, Hermansyah
[DETERMINATION OF SYNTHETIC SILICA ADSORPTION PARAMETERS OF OIL PALM SHELLS AGAINST THE CONTENT OF AMMONIUM ON LIQUID TOFU WASTE] This research aims to determine adsorption capacity of synthetic silica synthesized from Palm Oil (Elaeis guineensis Jacq) shells ashes against the content of Ammonium on tofu liquid waste . The shell sample soaked in a solution of HCl 10% for 2 hours, charred at a temperature of 300 °C for 3 hours ago ashed at 600 °C for 2 hours. Then ash soaked with HCl 1.2 M for 24 hours. Taken 120 g of ash shells and then mixed right while heated with 160 mL 4 M NaOH. The residue obtained is heated at a temperature of 5000 °C for 30 minutes, cooled to room temperature and retrieved the Na2SiO3 particle.The particle then dissolved into 200 ml aquademin and settled at 12 hours, filtered and filtratnya ditetesi with HCL 1 M while stirring, until the white gel is formed and settled in the next 24 hours, filtered, and dried at a temperature of 120 °C for 2 hours, an silica powder obtained as result. Ammonium Adsorption is done with mass variation 0125, 0.25, 0.5, 0.75, and 1 g silica as well as variations of the contact time of 15, 30, 60, 90, and 120 minutes. The results showed Ammonium adsorption at tofu liquid waste by silica synthesis from the Palm Oil shell ashes occurs with a maximum mass of 0.25 g and optimum contact time of 30 minutes with a capacity of adsorption of 2.581 mg/L and 3,154 mg/L as well as with adsorption efficiency at 61.9% and 76.8%.
University of Bengkulu
2018-06-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4709
10.33369/atp.v2i1.4709
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4709/2580
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4738
2018-06-09T10:27:45Z
alotropjurnal:ART
EKSPERIMEN KINETIKA ENZIM MENGGUNAKAN MODEL INKUIRI TERBIMBING UNTUK MENINGKATKAN KETRAMPILAN BERPIKIR KREATIF MAHASISWA
Amida, Nadia
Supriyanti, F.M. Titin
Liliasari, Liliasari
[EXPERIMENT OF ENZYME KINETICS USING GUIDED INQUIRY MODEL FOR ENHANCING CREATIVE THINGKING SKILLS] Purpose of this study was enhancing creative thinking skills of students using guided inquiry model through experiments of enzyme kinetics based on local materials. Method of this research was quasi-experimental methods, with pretest-posttest nonequivalent control group design. Subjects of this study were chemistry students enrolled in biochemistry lab course, consisted of 18 students in the experimental class and 19 students in control class. Instrument in this study were essay test that involves 3 indikators of creative thinking skills (i.e. fluency, flexibility, and elaboration) and also student worksheets. The results showed that the experiments of kinetics enzyme using guided inquiry model have been enhance creative thinking skills in medium category with a value of N-gain average of 0.66. Two indikators classified in the high category are fluency and elaborationwith the value of N-gain 0,71. Meanwhile, indikator of flexibility in the medium category with a value of N-gain 0,56.
University of Bengkulu
2018-06-09
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4738
10.33369/atp.v2i1.4738
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4738/2598
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4740
2018-06-10T07:41:02Z
alotropjurnal:ART
HUBUNGAN MINAT BELAJAR SISWA DENGAN PRESTASI BELAJAR SISWA PADA MATA PELAJARAN KIMIA DI SMA NEGERI 1 TEBAT KARAI DAN SMA NEGERI 1 KABUPATEN KEPAHIANG
Rozikin, Slamet
Amir, Hermansyah
Rohiat, Salastri
[RELATIONSHIP OF STUDENTS LEARNING ACHIEVEMENTS WITH STUDENTS LEARNING INTEREST IN THE CHEMISTRY SUBJECTS AT SMA NEGERI 1 TEBAT KARAI AND SMA NEGERI 1 KEPAHIANG] This study aims to measure the significance of relationships of interest in learning chemistry with the result of chemical learning students in class X IPA residing in SMA Negeri 1 Tebat Karai and a in SMA Negeri 1 Kepahiang at 2016/2017 academic year.. The research is the correlation research. The population in this research is the whole class of X IPA grade in SMAN 1 Tebat Karai and SMAN 1 Kepahiang at 2016/2017 academic year with total population 218 students who at was a total sample of research. Data collection techniques in the study used the instruments form of the interest in learning chemistry. Data analysis tested using correlation analysis, test validity, reliability, linear regression and hypothesis testing. Based on the analysis of the data obtained to the conclusion that there was a significant positive relationship between interest in study with the results of the study chemistry well in SMA Negeri 1 Tebat Karai and SMA Negeri 1 Kepahiang, indicated from the value of F test is greater than F table (30.225 > 3.885) with contributions amounting to 76.4% with the most significant influence indicator is an understanding of the concept of the learning materials with the value of the average correlation of 0,377, 14. From the results of research conducted obtained the conclusion that that interest in learning affects student learning results in class X SMA Negeri 1 Tebat Karai and SMA Negeri 1 Kepahiang.
University of Bengkulu
2018-06-10
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4740
10.33369/atp.v2i1.4740
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4740/2599
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4744
2018-06-13T22:35:27Z
alotropjurnal:ART
POTENSI AKTIVITAS ANTIOKSIDAN METABOLIT SEKUNDER DARI BAKTERI ENDOFIT PADA DAUN Moringa oleifera L
Yati, Susi Juni
Sumpono, Sumpono
Candra, I Nyoman
[POTENTIAL ANTIOXIDANT ACTIVITY OF SECONDARY METABOLITES FROM ENDOPHYTE BACTERIA ON Moringa oleifera L LEAF] This research aims to know the similarities between secondary compound metabolites produced by endophyte bacterial on host leaves and from Moringa oleifera L (kelor) leaves as well as determine the magnitude of antioxidant activity compounds of secondary metabolites produced by bacterial endophyte. Based on the results of the test compound is secondary metabolite in both samples, for secondary metabolite compounds in the extract of the leaves of M. oleifera L. contains identified steroid compounds, flavonoids, saponins, tannins and phenolic compounds, while for metabolites secondary bacterial endophyte undetectable on the existence of any secondary metabolite compounds.For testing of antioxidants on endophyte bacterial extracts of leaves of M. oleifera L is done using the DPPH method, performed on variations of the concentration of 200, 400, 600, 800, and 1000 ppm with Ascorbic acid as a comparison. The results of the test get an IC50 of M. oleifera L leaf extract at 243.67 ppm, and supernatan extract from endophyte bacterial at 492 ppm. The IC50 values showed antioxidant activity in secondary metabolite compounds derived from extracts of the leaves of M. oleifera L which has an extreme antioxidant category. The amount of antioxidant activity for secondary metabolite compound extracts of bacterial endophyte on leaves of M. oleifera L category is feeble, and to extract the supernatan activity is weak compared to the value of the antioxidant activity of Ascorbic acid.
University of Bengkulu
2018-06-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4744
10.33369/atp.v2i1.4744
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4744/2602
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/4807
2018-06-26T12:39:45Z
alotropjurnal:ART
PEMBUATAN DAN KARAKTERISASI METIL SELULOSA DARI BONGGOL DAN KULIT NANAS (Ananas comosus)
Rahmidar, Lena
Wahidiniawati, Seruni
Sudiarti, Tety
[MAKING AND CHARACTERIZATION OF CELLULOSE METHOD OF BONGGOL AND LEATHER LEATHER (Ananas comosus)] Wastes of core and peel of pineapple are often not utilized properly, in fact the waste has nutritional content that can be useful. Carbohydrate content in the waste is large enough and allows to be utilized. The purpose of this research is for converting glucose into cellulose and synthesized into methylcellulose. The first stage is glucose from core and peel of pineapple converted into microbial cellulose with Acetobacter xylinum bacteria with the addition of nitrogen and carbon sources. The second stage is synthesis of methylcellulose with methylene chloride and the solvent aquadest/acetone. The dried microbial cellulose was firstly swelled with NaOH addition, then methylation by addition of solvent and methylene chloride and then refluxed at 50-60. Then methyl cellulose neutralized, washed and dried at 50.The FTIR results showed typical cellulose uptake for cellulose microbial pineapple core at wave number 3377.36 cm-1 for OH bonds and 2935.66 cm-1 for CH bonds and in cellulose microbialpineapple peel at wave number 3377.36 cm-1 for OH bonds and 2935.66 cm-1 for the CH bonds. The ratio OH/CH of methyl cellulose-acetone has a smaller value in the core and peel of pineapple concluded that acetone is more efficient to use as a solvent at the methylation. The substitution value of the core and peel of pineapple skin is estimated to below based on the solubility test results.
University of Bengkulu
2018-06-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/4807
10.33369/atp.v2i1.4807
ALOTROP; Vol. 2 No. 1 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/4807/2654
Copyright (c) 2018 Alotrop
oai:ojs.localhost:article/7474
2019-05-21T13:55:04Z
alotropjurnal:ART
UJI AKTIVITAS ASAP CAIR CANGKANG BUAH KARET (Hevea brassiliensis) DAN APLIKASINYA DALAM PENGHAMBATAN KETENGIKAN DAGING SAPI
Putri, Haulia Dwi
Sumpono, Sumpono
Nurhamidah, Nurhamidah
This research was aimed to know the degree of Fenol compound, total acid and the activity of liquid smoke of Rubber (Hevea brassiliensis) Seed Shell also the application in obstructing the rancidity of beef. The Fenol compound was determined by using Reagen Follon-Ciocalteu. The total acid was determined by using the method of titrated acids.The ability as the antioxidant was tested by DPPH method and the ability of obstructing the rancidity of beef was done by measuring the alteration of TBA value in beef as long as saved. The result was shown the fenol compound in liquid smoke of Rubber Seed Shell as much as 0,84 % and the acetic acid content was 4.725%. The antioxidant test was produced IC50 value as much as 101.27 ppm. According to the IC50 value which got from the test that the liquid smoke of Rubber Seed Shell were included in moderate category. The increment of the liquid smoke of Rubber Seed Shell were able to suppress the rancidity of beef during the storage time. It was marked by the decreasing of TBA value in beef as given in treatment A1 (liquid smoke 4% ) and A2 liquid smoke 6%. The treatment without the liquid smoke (A0) increased the TBA value from 0.05 mgMDA/Kg on day (0) to 0.615 mgMDA/Kg on day 6. The treatment of concentration liquid smoke 4% (A1) increased from 0.039 mgMDA/Kg on day (0) to 0.395 mgMDA/Kg on day 6. The treatment of concentration liquid smoke 6% (A2) increased from 0.031 mgMDA/Kg on day 0 to 0.209 mgMDA/Kg on day 6.
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7474
10.33369/atp.v2i2.7474
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7474/3694
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7475
2019-05-21T14:22:48Z
alotropjurnal:ART
PERBEDAAN HASIL PEMBELAJARAN PROBLEM BASED LEARNING (PBL) MENGGUNAKAN MIND MAPPING DAN SUMMARIZES PADA KELAS XI IPA MAN 1 KOTA BENGKULU TAHUN AJARAN 2017/2018
Kasih, Alfia Novera Indah Esa
Bahar, Amrul
Rohiat, Salastri
This study aims to determine differences in ProblemBased learning (PBL) using mind mapping ( PBL-mind mapping) and summarizes (PBL –summarizes) on the subject of ionic equilibrium in saline solution. The type of research used is quasi experimental research with population class XI IPA in MAN 1 Kota Bengkulu 2017/2018 academic year which amounted to 152 people and samples taken from normal and homogenous population by random sampling technique so that got sample that is class XI IPA 1 (PBL -Mind Mapping) as an experiment 1 with 36 people and class XI IPA 2 (PBL-Summarizes) as an experiment 2 which is 38 people.Data obtained in the form of cognitive domain learning results obtained from test results in the form of pretest and post-test. Data analysis used were mean score, normality test, homogeneity test, and hypothesis / t test with significance value ? = 0.05 calculated with SPSS 16.0 for Windows. Student learning outcomes in this study seen from the value of difference between pretest and post-test values. The average of pretest and post-test difference of experimental class 1 and 2 students were 56.11 and 49.21 and t-test obtained t-count value is greater than t-table (2.088> 1.99).The results of the data show that there are significant differences between the experimental classes 1 and 2 and show that the result of learning PBL using mind mapping is better with KKM achievement of 83.4% than the result of learning PBL using summarizes with KKM exhaust amounted to 68.4%.
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7475
10.33369/atp.v2i2.7475
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7475/3695
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7478
2019-05-22T07:21:42Z
alotropjurnal:ART
BIOSORPSI ION LOGAM BERAT Cu(II) DAN Cr(VI) MENGGUNAKAN BIOSORBEN KULIT KOPI TERXANTHASI
Adriansyah, Renaldi
Restiasih, Elyn Novta
Meileza, Nessi
There are several methods that have been used to remove and reduce the contamination of heavy metal ions.Among theseveral methods, biosorpsi is a cheap and high efficiency method. One of the organic materials that have potential to become heavy metal ion biosorbent was coffee skin.However, to improve the performance of coffee skin in adsorption of heavy metal ions Cu (II) and Cr (VI) then biosorbent need to be modified through xanthation process.This xanthation process carried out by reacting the coffee skin with carbon disulfide compounds in an alkaline condition.This study aims to determine the ability of xanthated coffe skin biosorbentin adsorption of Cu (II) and Cr (VI) metal ions and to know the optimum condition of the metal ion adsorption process byxanthated coffe skin biosorbent. From this research we got the optimum mass of Cu (II) and Cr (VI) metal ion adsorption of 0.45 and 0.6 gram. The optimum pH of Cu(II) and Cr(VI) metal ions adsorption occurs at pH 4.While the optimum contact time occurs at 100 minutes for Cu (II )metal ion adsorption and 80 minutes for Cr (VI) metal ion adsorption. In addition, the maximum biosorption capacity of xanthated coffeskin biosorbent in adsorption of Cu (II) and Cr(VI) metal ions respectively 62.5 mg/g and 8.064 mg/g. So it can be concluded that xanthated coffe skin biosorbenthave a better ability to adsorb Cu (II) metal ions than Cr (VI) metal ions.
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7478
10.33369/atp.v2i2.7478
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7478/3696
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7479
2019-05-22T07:31:07Z
alotropjurnal:ART
PERBANDINGANHASIL BELAJAR SISWA MENGGUNAKAN MODEL PEMBELAJARAN KOOPERATIF TIPE MAKE A MATCH (MM) DANTEAM GAMES TOURNAMENT (TGT) PADA MATA PELAJARAN KIMIA DI KELAS X IPA MAN 1 KOTA BENGKULU
Syofiana, Nova
Rohiat, Salastri
Amir, Hermansyah
This study aimed to determine differences in students’learning outcomes using cooperative learning model with Make A match and Team Games Tournament on chemistry subject of X IPA in MAN 1 Kota Bengkulu.A quasi-experimental (quasi experiment) was used as research model.Population of this research was all of X IPA students which was137 students,then,there were 74 students as sample of this research taken from two classes, X IPA1 and X IPA 3.The techniques in data analysis used mean value,questionnaire analysis,normality test,homogeneity test,and t-test with significant ? = 0,05.The data collecting technique was done by usinga SPSS16 program for windows.The data on students learning outcomes were seen by differences between pre-test and post-test.Experiment 1class had 47.44 as the average of the differences and Experiment 2 class had43.79 as the average of the differences.The result showed that the students learning outcomes were influenced by learning motivation.Additionally,the data of students learning outcomes in both classes obtained from the learning motivation percentage which were 83,84% categorized as very good and 7,49% as good.From the resultof this study,it could be concluded that, generally,either the learning outcomes or students learning motivation in applying cooperative learning model,TGT type is higher than MM type.It showed that t count > t table,where 1.7515 > 1.6662 forlearning outcomes and 8.9804 > 1.6662 for students learning motivation.In the sameway,there is a significant difference between learning outcomes and students learning motivation by applying cooperative learning model in two types,namely Make A Match (MM) and Team Games Tournament (TGT).
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7479
10.33369/atp.v2i2.7479
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7479/3697
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7480
2019-05-22T07:54:41Z
alotropjurnal:ART
PEMANFAATAN SILIKA DARI PASIR PANTAI LINAU UNTUK MENGURANGI KADAR AMMONIUM DALAM LIMBAH CAIR TAHU
Nurbaiti, Chrisnia
Elvia, Rina
Chandra, I Nyoman
The purpose of this study was to synthesize silica from Linau beach sand and its application as an adsorbent in reducing ammonium content in tofu liquid waste. Silica synthesis was carried out using the Sol-gel method using raw materials of 20 grams of refined sand, by dissolving sand into 160 mL NaOH 4 M while being heated and stirred constantly at 1050C for 90 minutes, and then filtered using filter paper. The residue obtained was calcined at 500oC for 30 minutes. The solid obtained is dissolved into 200 mL aqua DM so that it becomes a sodium silica solution. The sodium silicate solution was obtained, then added 1 M HCl solution drop by drop until it was obtained pH 7, and then left for 18 hours until a gel was formed and continued with washing using aqua DM and filtered with filter paper. The gel obtained was then dried at 1050C for 8 hours in the oven to obtain silica powder. Silica redemen produced from silica synthesis from Linau beach sand was obtained at 0.405%. The results showed that the synthesis silica from Linau beach sand was able to reduce ammonium content in tofu wastewater with the yield parameters in the form of tofu waste content decreasing at optimum mass 0, 25 grams, contact time 15 minutes with adsorption efficiency of 32.59%
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7480
10.33369/atp.v2i2.7480
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7480/3698
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7481
2019-05-22T08:13:50Z
alotropjurnal:ART
PERBANDINGAN AKTIVITAS DAN HASIL BELAJAR KIMIA SISWA SMAN 2 ARGAMAKMUR PADA PEMBELAJARAN MENGGUNAKAN TEAM ASSISTED INDIVIDUALIZATION DAN GROUP INVESTIGATION BERBASIS KURIKULUM 2013
Dewi, Ria Kemala
Sumpono, Sumpono
Rohiat, Salastri
This research was aimed to know the differences between the student’s chemical learning activities and achievement by using a models called Team Assisted Individualization and Group Investigation based on Curriculum 2013. The samples in this research is class X MIA 3 (Team Assisted Individualization) and X MIA 6 (Group Investigation). The result of this research is learning activities and achievement and than the analysis used are the score and percentage of mean, normality tests, homogeneity tests, hypothesis tests. The observation result of student’s learning activities in the 1 and 2 of experimental class was 78.79% and 68,18%. The mean score of student’s achievement for experimental class 1 and 2 was 80,56 and 75,31. The result of t test obtained tcount > ttable, 10,6 > 1,0 for learning activities and 3,36 > 2,30 for achievement. It means there was a significant differences between the student’s chemical learning activities and achievement by using both models of learning.
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7481
10.33369/atp.v2i2.7481
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7481/3699
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7483
2019-05-22T12:14:45Z
alotropjurnal:ART
KAPASITAS ADSORPSI ARANG AKTIF CANGKANG BINTARO (Cerbera odollam) TERHADAP ZAT WARNA SINTETIS REACTIVE RED-120 DAN REACTIVE BLUE-198
Aisyahlika, Siti Zaya
Firdaus, M. Lutfi
Elvia, Rina
The objective of this research was to utilize bintaro shell waste (Cerbera odollam). The morphology of bintaro shell is similar with coconut shell and the contains of lignin and cellulose is higher than coconut. Bintaro shell waste used as activated charcoal to remove environmental pollution caused by synthetic dyes waste of batik industry. The adsorbents were then applied to remove of Reactive Red-120 (RR) and Reactive Blue-198 (RB) dyes in aqueous solution using Visible Spectrophotometer analysis method. Bintaro shell was dried, cut and carbonized at 400°C for 1 hour, then activated with ZnCl2 20% for 24 hours at 27°C and dryed in oven at 105°C for 30 minutes. The activated charcoal of bintaro shell has proven afford to adsorbing RR and RB dyes. The optimum conditions (pH, contact time, adsorbent weight and temperature) were determined to obtain best adsorption capacity. The optimum of conditions for RR occured at pH 2, contact time of 40 minutes and adsorbent weight 100 mg while RB occurred at pH 11, contact time of 60 minutes and adsorbent weight 50 mg and with each the temperature 30°C. At optimum conditions the adsorption isotherm followed Freundlich model with maximum adsorption capacity obtained for RR and RB were 332.6 and 243.9 mg/g, respectively.
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7483
10.33369/atp.v2i2.7483
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7483/3700
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7484
2019-05-22T12:24:31Z
alotropjurnal:ART
PENERAPAN MODEL PEMBELAJARAN KOOPERATIF TIPE COURSE REVIEW HORAY(CRH) UNTUK MENINGKATKAN MOTIVASI DAN HASIL BELAJAR KIMIA SISWA SMA N 1 KOTA BENGKULU
Zulhulaifah, 1Nurul
Nurhamidah, Nurhamidah
Elvinawati, Elvinawati
This study is a classroom action research applying the Course Review Horay learning model on the subject of basic chemical laws and chemical reaction equations in three cycles with four stages: planning, implementation, observation and reflection on each cycle aimed at improving motivation, activity and results learning chemistry of students of class X IPA 5 SMA N 1 Kota Bengkulu academic year 2017/2018. The study was conducted in March-April of 2018 with a total of 27 students, consisting of 17 women and 10 men. The data were obtained using questionnaire of motivation, posttest and observation sheet of teacher and student activity, which was processed using simple quantitative analysis technique, mean score of motivation questionnaire and observation sheet, percentage of classical absorption and classical learning completeness. From the results of this study it can be concluded that the application of CRH learning model proved able to increase the students' motivation, activity and chemistry learning achievement to reach the minimum mastery criteria of ?75 in the third cycle. Student learning motivation increased every cycle from pre cycle up to cycle III 35,69% (low), 38,95% (low), 59,71% (medium) and 78,96% (high) respectively. The activities of teachers and students also increased each cycle in a row: teacher activity scores: 36, 38 and 38.5 with good category and student activity score: 29 (enough), 37,5 and 38 with good category. Student learning outcomes in cycle I obtained an average value of 54.3; 54.3% classical absorption and 16% classical learning completeness. In cycle II, the average score is 72.5; 72.5% classical absorption and 57.69% classical learning completeness. In cycle III, the average score is 78.76; 78.76% classical absorption and 84.61% classical learning completeness
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7484
10.33369/atp.v2i2.7484
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7484/3701
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7486
2019-05-23T06:59:26Z
alotropjurnal:ART
Pembuatan Biofuel dari Limbah Cair PMKS dengan Katalis MoCo-HZ
Muryati, Tyas Sri
Sundaryono, Agus
Handayani, Dewi
This research aims to convert vegetable oils contained in Palm Oil Mill waste (PMKS) into biofuels through the cracking process with MoCo-HZ catalyst . PMKS Liquid waste will be prepared with a process of a filtering, degumming, bleaching, warming, and free Fatty Acids determination. The results obtained are then converted into biofuel with catalytic cracking with use of MoCo-HZ catalyst . Then the cracking products will to test for specified physical characteristics of biofuel eq : acid number , density, viscosity, pour point and cloud point. . The research results showed that the MoCo-HZ catalyst is able to convert vegetable oils contained in the PMKS liquid waste will be cracked into biofuel. Conversion yield obtained is amounting to 48.19%. The physical characteristics of the test results against biofuels produced from the cracking process has not met the standard of comparison from gasoline and kerosene. This is shown by the still high number of biofuel produced acids amounting to 1.72 mg KOH/gr. higher than the numbers of sour gasoline (0.748 mg KOH/gr) and Kerosene (0.935 mg KOH/gr). The result of the test of density, viscosity, pour point and cloud point against biofuels produced from the cracking process have meet standard compared to gasoline and kerosene respectively 0.807 gr/cm for density, 1.056 cSt viscosity for viscosity , and 0 º C and 1.33 each º C to the freezing point and the cloud point..
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7486
10.33369/atp.v2i2.7486
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7486/3703
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7489
2019-05-24T14:07:57Z
alotropjurnal:ART
PERBANDINGAN HASIL DAN MINAT BELAJAR KIMIA SISWA KELAS X IPA MENGGUNAKAN MODEL PEMBELAJARAN KOOPERATIF SNOWBALL THROWING DAN TALKING STICK PADA KURIKULUM-2013 DI SMAN 10 KOTABENGKULU
Saputri, Rika Juwita
Sumpono, Sumpono
Elvia, Rina
The purpose of this research to determine the difference in learning outcome and interest of students on chemistry learning between class which applied snowball throwing and class which applied talking stick learning model on nomenclatur of chemical compounds material in curriculum-2013 of grade X IPA in SMA Negeri 10 Bengkulu City. Research conducted is a research with the type of quasi experiment. Analysis of the data used are mean values, normality test, homogeneity test, and t-test. Chemistry learning outcome data obtained pretest and posttest value where average improvement value of cognitive learning result for snowball throwing class and talking stick class are 56,970 and 45,606. While the interest of students learning of both experiment classes procure percentage are 81,567% and 75,373%. The result of t test with significant level (? = 0,05), then got value for tcount >ttable is 4,734 > 1,669 for learning result and 3,596 > 1,669 for interest learning. The results showed that there were significant differences in learning outcomes and learning interest between classes that applied snowball throwing learning and classes that applied the talking stick learning model.
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7489
10.33369/atp.v2i2.7489
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7489/3704
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7492
2019-05-27T10:21:00Z
alotropjurnal:ART
POTENSI SITOTOKSIK DAN ANTIBAKTERI EKSTRAK DAUN Laportea interrupta (L.) Chew (JELATANG AYAM) TERHADAP Staphylococcus aureus
Safitri, Okti Mindi
Nurhamidah, Nurhamidah
Amir, Hermansyah
This research aims to determine the profile of phytochemicals, determine the level of cytotoxic extract toward the larva of Artemia salina Leach by using Brine Shrimp Lethality Test (BSLT) method, and to measure how much the activity of antibacteria leaf ekstract of Laportea Interrupta (L.) Chew (Jelatang Ayam ) toward the Staphylococcus aureus bacteria. The leaf of L. interrupta (L.) Chew are dried and grinded well. The half of grinded sample are tested by phytochemical profile and another one are ekstracted by using etanol liquid for three days then they are evaporated. The result of fitokimia leaf L. interrupta (L.) Chew test contains secondary metabolite alkaloid, tanin, terpenoid, and saponin. The result of cytotoxic extract of leaf L. interrupta (L.) Chew toward the A. salina Leach is obtained LC50 for 93,33 ppm, so, the L. interrupta (L.) Chew is toxic because it is in the range of 31 ppm to 1000 ppm and it can be potentially as a anticancer agents. The eksract of Jelatang Ayam leaf can obstruct the growth of S. aureus, on 5 x 104 clear zone concentration that formed 9 mm being medium categorized. The more concentration of the Jelatang leaf ekstract then more its obstruction energy.
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7492
10.33369/atp.v2i2.7492
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7492/3705
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7558
2019-06-13T21:24:47Z
alotropjurnal:ART
PENERAPAN MODEL PEMBELAJARAN PROBLEM BASED INSTRUCTION (PBI)DENGAN MENGGUNAKAN MEDIA AUDIO-VISUAL UNTUK MENINGKATKAN AKTIVITAS BELAJARDAN HASIL BELAJAR SISWA DI SMA N09 KOTA BENGKULU
Mutaqwiyati, Isna
Nurhamidah, Nurhamidah
Amir, Hermansyah
This research was aimed to find out the student’s improvement of learning activity and learning outcome as the implementation of Problem Based Instruction (PBI) by using audio-visual media. The subject of this research was the students at grade X MIPA 3 of SMA N 09 Bengkulu Ciyty academic year of 2017/2018 which consisted of 27 students, on the subject of of chemistry’s basic laws and stoichiometry. This research was conducted by the researcher by using three cycles which consisted of four steps; planning, action, observation and reflection. The data collections were tests and non tests which consisted of post test and student’s learning activity observation sheets. The data of this research was analyzed by using simple quantitative data analysis; the student’s average score, the percentage of classical absorption and the percentage of classical learning mastery. Based on the result of this research can be concluded that the implementation of PBI by using audio-visual media improved student’s learning activity and learning outcomes in each cycle and achieved the clasical learning outcomes in cycle III. The improvements of student’s average score was; score 23 (Fair) of cycle I; score 26,33 (good) of cycle II; and score 28,66 (good) cycle III. The average score of teacher observation sheets of each cycles were; 25,66 fpr the first cycle (good), 28 for the second cycle (good), and 29,66 in the last cycle (good). There was also improvements of the students’ percentage of classical learning mastery from in cycle I 51,85%, to 66,66% in cycle II and 85,15% in cycle III.
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7558
10.33369/atp.v2i2.7558
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7558/3757
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7559
2019-06-13T21:43:05Z
alotropjurnal:ART
ANALISIS ION MERKURI (II) MENGGUNAKAN NANO PARTIKEL PERAK TERIMOBILISASI PADA KERTAS SARING
Meileza, Nessi
Firdaus, M. Lutfi
Elvinawati, Elvinawati
The aims of this research is improve stability and sensitivity of silver nanoparticles (NPP) immobilizatied on filter paper. Silver nanoparticles synthesized by reducing the ascorbic acid using a chemical reduction method. Immobilization NPP on filter paper is done with the technique of immobilization (immunosystem) is the process of molecular bonding reagent in supporting materials, so physically bound NPP the surface of filter paper is composed of cellulose fibers. The results obtained for the stability of immobilization NPP on filter paper can be last up to stable 60-daywhile liquid NPP stability can only last for 30 days. To maintained the stability ofimmobilization on filter paper is saved in a closed box. For the determination of sensitivity of immobilization NPP in the filter paper test is performed against the mercury (II) ion with each different concentrations. The results obtained for sensitivity of immobilization NPP on the filter paper is analyzed in digital image can be detect mercury (II) ion until the concentration of ppb. The results of measurement Limit of Detection (LOD) or limit the smallest NPP can detect mercury (II) ion is under 0.863 ppb, while liquid NPP able to detect only concentration 1.448 ppb.. The results of this research NPP immobilization on filter paper can be an alternative to increasingstability and sensitivity of NPP compared with liquid NPP, and can be applied into the colourimetry indicator is inexpensive and practical to analysis of mercury (II) ion in the digital image.
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7559
10.33369/atp.v2i2.7559
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7559/3758
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7560
2019-06-13T21:55:08Z
alotropjurnal:ART
PERBANDINGAN HASIL BELAJAR MENGGUNAKAN MODEL PEMBELAJARAN KOOPERATIF TIPE STAD DAN CRH PADA MATERI HIDROLISIS GARAM
Amida, Nadia
Andromeda, Andromeda
Bahrizal, Bahrizal
Lesson about hydrolysis requires students to understand the concepts hydrolyzed from type of salt which is then applied in the calculation. In learning process, students direct involvement is necessary, so that it is used a method that can increase the activity of students. Student Teams Achievement Division (STAD) cooperative learning and Course Review Horey (CRH) expected to create learning that has caharacterized as student centered. This research aims to reveal students' learning outcomes using STAD cooperative learning and CRH on the hydrolisis material in class XI SMAN 8 Padang. This type of research is experimental research using a randomized study design Control Group Posttest-Only Design is expanded. The study population was a class XI IPA SMAN 8 Padang. Giving a test at the end of the study as many as 25 pieces of matter objectively. Results of tests of normality and homogeneity of the two classes that both classes of samples obtained samples were normally distributed and had homogeneous variance. After being tested on a real level t = 0.05 with degrees of freedom (df) of 59 obtained t of 2.53 while t table of 1.67. From the research shows that the learning outcomes of students with STAD cooperative learning model is significantly higher than the results of student learning with cooperative learning model CRH hydrolysis of salts in the material in class XI of SMAN 8 Padang.
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7560
10.33369/atp.v2i2.7560
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7560/3759
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/7561
2019-06-13T22:08:33Z
alotropjurnal:ART
KARAKTERISASI NANOPARTIKEL KITOSAN EKSTRAK DAUN UBIJALAR (Ipomoea batatas L.) MENGGUNAKAN METODE GELASI IONIK
Putri, Ade Indriani
Sundaryono, Agus
Chandra, I Nyoman
The purpose of this study is to determine and measure the results of the characterization of Chitosan nanoparticle synthetized from leaves of sweet potato (Ipomoea batatas l.) extracts . The methods used to make nanoparticles is made with Ionic Gelation method based on electrostatic interaction between the Hydroxyl Amine on Chitosan with cluster of negative charge from the polianion NaTPP with conditioned surfactant Tween 80 used as surfactant. Characterization test of nanoparticle morphology in this study obtained using the Fourier Transformation Infra Red (FTIR), and Particle Size Analyzer (PSA). Results with FTIR characterization test from the obtained Chitosan-white purple sweet potato leaf extract nanoparticles has a cluster of N-H and P = O that show the occurrence of ammonium ion interaction between Chitosan with polianion from NaTPP and sweet potato leaves. The interaction seen from wave number and intensities O-H shifting from pure Chitosan at 3425.56 cm-1 to 3427, 51 cm-1, as well as on pure Chitosan N-H absorption undergoes a shift from 1597, 06 cm-1 to becomes 1629.85-1 cm-1, which shows that there has been a cross connective between ammonium ion on Chitosan and Posphat from NaTPP and white purple sweet potato leaf extract. The results of the analysis from the PSA, is known to the average Nanokitosan particle sizes extracts from white purple sweet potato leaf extracts with the addition of NaTPP i.e. of 302.6 nm and that the aim of the research on Chitosan nanoparticle synthesis has been successfully done.
University of Bengkulu
2019-05-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/7561
10.33369/atp.v2i2.7561
ALOTROP; Vol. 2 No. 2 (2018)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/7561/3760
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9019
2019-09-23T11:10:25Z
alotropjurnal:ART
PEMANFAATAN EKSTRAK BUAH Morus alba L. (Murbei) SEBAGAI PENGAWET ALAMI IKAN Selaroides leptolepis (Selar)
Nastiti, Diah Sari
Nurhamidah, Nurhamidah
Chandra, I Nyoman
The purpose of this study is to measure the influence of concentration and time of soaking of fruit extracts Morus alba l. (Mulberry) is effective as a preservative Selaroides leptolepis fish (Trevally). Samples taken of coral in the fruit of the Holy City of Argamakmur, North Bengkulu and trevally fish samples taken directly from the beach, the village Plow Jakat, province of Bengkulu. Fruit samples grinded using a blender and aqueous extracts are obtained through maceration method using aquades and filtered so that retrieved the mulberry and subsequent solution diluted with aquades be a concentration of 20, 40, 60 and 80% (v/v). Phytochemicals profile test to determination of secondary metabolites in extracts. The test is done through the methods of preserving this soaking on a several concentrations variation and soaking time with without soaking as control. The variation of the concentrations is done at a concentration of 10, 20, 30 and 40%, with soaking time variation 1, 2 and 3 hours. Variation of time observations were at 12, 18 and 24 hours and test the chemical content in the form of a test of water content, levels of Total Volatile Bases (TVB), and pH values. Phytochemical test results obtained the presence of saponins, alkaloids, terpenoids, phenolic and flavonoid compounds and do not contain steroids. The results showed that the extract of Mulberry fruits proved capable of lowering the pH and the levels of TVB but does not affect the water content of the fish. Soaking time variations do not affect the water content, pH and the levels of TVB. From the results obtained that the use of the mulberry fruit extract at concentrations of 30% with long submergence 1 hour most optimal for use as a preservative natural for S. leptolepis up to 18 hours at room temperature to the value pH 6.7 and TVB at 27.2 mg N%.
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9019
10.33369/atp.v3i1.9019
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9019/4423
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9026
2019-09-23T11:10:25Z
alotropjurnal:ART
STUDI PERBANDINGAN KEMAMPUAN BERPIKIR KRITIS SISWA MENGGUNAKAN MODEL KOOPERATIF TIPE TAKE AND GIVE DAN THINK PAIR SQUARE DI KELAS XI IPA SMA NEGERI 1 REJANG LEBONG
Amalia, Windy Novita
Amir, Hermansyah
Sumpono, Sumpono
The purpose of this research is to measure the difference of improvement of students' critical thinking ability by applying the cooperative model Take and give type with Think Pair Square type on salt hydrolysis material in grade XI IPA SMA Negeri 1 Rejang Lebong academic year 2017 / 2018. This study was conducted with a population of 201 students from 6 IPA classes and a sample of 68 students from 2 classes it class XI IPA 1 as experiment 1 and XI IPA 5 as experiment 2 which can be from normality and homogeneity test. The research is a kind of quasi experiment. Data analysis used is normality test, homogeneity test and hypothesis test. The students' critical thinking ability data is obtained from the pretest and posttest values at the beginning of the meeting and at the end of the meeting. This critical thinking skills test consists of 15 essay questions. The average increase in critical thinking skills for Take and give classes with Think Pair Square class is 44,757 and 51,683. By testing the hypothesis using t test with a significant level of 0.05, then obtained the value for t hitung> t table is 3.081> 1.668. The results showed that students' critical thinking skills with the classes that apply the Think Pair Square learning model is better than the class that applied the Take and give learning model.
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9026
10.33369/atp.v3i1.9026
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9026/4424
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9027
2019-09-23T11:10:25Z
alotropjurnal:ART
ANALISIS KEMAMPUAN TANAH DI DAERAH PEMUKIMAN KOTA BENGKULU DALAM MENJERAP ALKYL BENZENE SULPHONATE (ABS) DAN LINEAR ALKYLBENZENE SULPHONATE (LAS)
Ananda, Fikri
Candra, I Nyoman
Elvinawati, Elvinawati
This research aims to know the ability of land in a residential area of the city of Bengkulu in adsorbed Alkyl Benzene Sulphonate (ABS) and Linear Alkyl Benzene Sulphonate (LAS). Soil samples were taken at five-point i.e. the backyard of Balai Buntar, Fatmawati Airport, Beringin Raya , Pematang Gubernur and Simpang Nakau with a drill ground at a depth of 20 cm and cleaned from garbage impurity. Then the soil characterized include moisture content, pH, texture and the organic content and ABS and ALS adsorbsition measured using UV-vis spectrophotometers att 222-223 nm wavelengths. In this research tested the influence of pH, pulp and optimum contact time contacts from soil sample at in ABS and ALS adsorbsition The adsorbtion pattern is known as the Freundlich and Langmuir parameters. Based on research, generally, it can be concluded that the land in the residential area of Bengkulu city has characteristic average water content – average 23%, pH average – average 5.35 and it's Turn dusty clay. The optimum condition from soil in adsorbs from Alkyl Benzene Sulphonate (ABS) occurs at pH 3, a mass of 1 g and 2 hours of contact time with the adsorption capacity of 0.874 mg/g, while for Linear Alkyl Benzene Sulphonate (LAS) adsorption the optimum soil conditions occur at pH 2, mass 0.5 g and 1-hour contact time with the adsorption capacity of 1.607 mg/g. The pattern of soil adsorption against ABS tends to follow the Langmuir equation whereas against LAS tend to follow the Freundlich equation. Adsorpstion of soil samples in Bengkulu City against ABS belongs to low and adsorpstion against LAS belongs to very low
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9027
10.33369/atp.v3i1.9027
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9027/4425
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9028
2019-09-23T11:10:25Z
alotropjurnal:ART
PERBANDINGAN PEMBELAJARAN SAINTIFIK MENGGUNAKAN MODEL KOOPERATIF TIPE STUDENT FASILITATOR AND EXPLAINING (SFE) DAN STUDENT TEAMS ACHIEVEMENT DIVISION (STAD) TERHADAP HASIL BELAJAR KIMIA
Astiani, Florentina
Bahar, Amrul
Amir, Hermansyah
This study aims to determine differences in student learning outcomes in chemistry learning using cooperative learning model of Student Facilitator and Explaining (SFE) type and Student Teams Achievement Division (STAD) on the subject of compound nomenclature. This research type is quasi experiment research with population that is class X MIPA in SMAN 9 Kota Bengkulu even semester of academic year 2017/2018 while sample is class X MIPA 2 and class X MIPA 4 obtained from result of normality test and homogeneity test. Student learning outcomes in this study is seen from the difference between pretest and posttest values. Data analysis used were mean value, normality test, homogeneity test and hypothesis test (t test). The average of pretest and posttest difference of the students in the experimental class I (SFE) was obtained 58.70 while in the experimental class II (STAD) obtained the value 54.25. So it can be concluded that student learning outcomes that apply SFE type cooperative model is higher than student learning outcomes that apply STAD type. After testing hypothesis with significant level (? = 0,05), then obtained tcount value> ttable that is 1.782819 > 1.67469. The results showed that there was a significant difference between experimental class I using SFE type cooperative learning model and experiment II class using STAD type.
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9028
10.33369/atp.v3i1.9028
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9028/4426
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9033
2019-09-23T11:10:25Z
alotropjurnal:ART
UJI EFEKTIFITAS ASAP CAIR CANGKANG BUAH KARET (Hevea braziliensis) SEBAGAI ANTIBAKTERI Bacillus subtilis
Sari, Lia Retno
Sumpono, Sumpono
Elvinawati, Elvinawati
The purpose of this research was know the effectiveness quid smoke the liquid smoke of the rubber (Hevea braziliensis) shell.The manifacture and purification of liquid smoke is carried out by 4 stages: pyrolysis, sedimentation, distillation, redestilate. The first of the research is calculating phenol levels, total acid, pH, and type weights The results showed that the feeding of rubber (Hevea braziliensis) shell liquid Smoke proved to inhibit the growth of bacteria Bacillus subtilis where the higher the concentration of liquid smoke, the greater the resistance. The phenol levels contained in the liquid smoke of the rubber shells were obtained at 0.84% with a total acid rate of 4.725%, and a pH at 2.548 and a density at 1.004. Antibacterial test using disc paper with see diameter clear zone. Bacterial using is pure cultur Bacillus subtiis bacteria. The concentration liquid smoke to antibacteral test is 5%, 10%, 15%, 20% and 25%. Of the five treatment obtained KHM 20% with diameter clear zone is 5,21 mm. Analysis results using One Way ANOVA obtained F hitung ? f tabel then there Significant differences Against the resulting clear zone.
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9033
10.33369/atp.v3i1.9033
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9033/4427
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9034
2019-09-23T11:10:26Z
alotropjurnal:ART
PERBANDINGAN HASIL BELAJAR KIMIA SISWA MENGGUNAKAN MODEL PEMBELAJARAN WORD SQUARE DAN MODEL PEMBELAJARAN SCRAMBLE DI MAN 2 KOTA BENGKULU
Shintia, Weny
Bahar, Amrul
Elvia, Rina
This study aimed to compare the chemistry learning outcomes of students with using word square model learning and scramble model learning in grade X MAN 2 Kota Bengkulu on the subject of chemistry compound nomenclature. This was quasy experimental research and held in March to May 2018. Population in this study is the entire class X MIA in MAN 2 Kota Bengkulu 2017/2018 academic year, amounting to 149 students. Sample is class X MIA 1 and class X MIA 3. The sample of the research is class X MIA 1 with 32 students and class X MIA 3 with 33 students. Data analysis used normality test, homogeneity test and hypothesis test (t test). Data analysis was performed using Statistical Package for The Social Science (SPSS) version 16.Improvement student’s learning outcomes in this research was taken from difference assess of pretest and posttest. At experiment class of I average value improvement of student’s learning outcomes was 50.32. while at experiment class of II, average value improvement of student’s learning outcomes was 44.4 . through some statistic test, there was t-test (? = 0.05) which done test the hypothesis to obtained the test result was t value = 2.174 and t tabel = 1.998. The result of data analysis showed that were significant differences in student learning outcomes between the class which implemented word square model learning and the class which implemented scramble model learning. Student learning outcomes that apply the word square model of learning better than student learning outcomes that apply the scramble model of learning.
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9034
10.33369/atp.v3i1.9034
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9034/4428
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9038
2019-09-23T11:10:26Z
alotropjurnal:ART
PROFIL FITOKIMIA DAN PENGARUH EKSTRAK TANGKAI DAUN TALAS KEMUMU (Colocasia gigantea Hook.f ) TERHADAP JUMLAH LEUKOSIT Mus musculus
Asri, Rofiqa
Handayani, Dewi
Sundaryono, Agus
This research aims to identify secondary metabolite compounds in Talas kemumu leaf stalk (Colocasia gigantea Hook.f) and to determine the effect of extract on the number of male Mus musculus leukocytes that have been induced aspirin. Aspirin is used to increase the number of M.musculus leucocytes.The method used in this research is the method of extraction by maceration to attract secondary metabolites of active compounds C.gigantea leaf stalk and the measurement of blood leukocyte counts are calculated using a hemocytometer (improved neubauer). Test of the effect of the leaf stalk of C.giganteaextract on the number leukocytes of M.musculus was performed by dividing into 5 groups with 5 replications according to the Federer formula, namely K (-) were given distilled water, K (+) were given aspirin, P1, P2 and P3 are each given a dose of extract of C.gigantea leaf stalk of 0,028 g/KgBB, 0,056 g/KgBB and 0,084 g/KgBB. The results showed that the identification of phytochemical profile in C.gigantea leaf stalk contains secondary metabolite compounds such as alkaloids, flavonoids, terpenoids, tannins and saponins. The results shows that giving of C.gigantea leaf stalk extract can reduce the number of leukocytes M.musculus which have induced aspirin. The giving of C.gigantea leaf stalk extract can decrease the number of aspirin-induced M.musculus leukocytes. This is evident from the results of One Way Anova analysis and the Smallest Real Difference Test (BNT) because in each treatment group has a significant influence. The effective dose that has the greatest activity in decreasing the number of M.musculus leukocytes found in the P1 treatment of 0,028 g /KgBB can decrease the blood leukocyte count by 6,830 / mm3.
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9038
10.33369/atp.v3i1.9038
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9038/4429
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9039
2019-09-23T11:10:26Z
alotropjurnal:ART
Studi Komparasi Motivasi Belajar Kimia Siswa Kelas X Program Peminatan dan Lintas Minat di MAN 2 Kota Bengkulu
Haster, Elinge
Rohiat, Salastri
Sumpono, Sumpono
The purpose of this research was to measure differences chemistry learning motivation of tenth grade students class at major (MIPA) and cross-major (IPS) courses in MAN 2 Bengkulu city. The population in this research is 260 students from 8 classes consisting of four MIPA classes and four IPS classes and also become sample in this research. The type of this research is quantitative descriptive that aims to provide a description of the variables of learning chemistry motivation in the class of major (MIPA) and cross-major (IPS) and emphasize the analysis on data figures obtained by statistical methods. Chemical learning motivation data obtained from the results of a questionnaire motivation to learn chemistry. Questionnaire of motivation to learn chemistry consists of 61 items that validity tested by using SPSS (Statistical Package for the Social Sciences) program to obtain 54 valid items and 7 invalid items and tested reliability with Cronbach's Alpha value of 0.897 and this questionnaire is stated reliable. The research questionnaires were analyzed using normality test, homogeneity test and hypothesis test. The average value of students' learning motivation of major (MIPA) and cross-major (IPS) in chemistry subjects was 197.19 and 189.71 in the good category. The hypothesis testing by using the test T 0.05 at significant level, then it was gained value namely 2.8027 > 1.6508. The results showed that there is a significant difference between major courses and cross-major courses in the chemistry learning motivation of tenth grade students. Motivation to learn chemistry in the major courses better than cross-major courses.
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9039
10.33369/atp.v3i1.9039
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9039/4430
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9040
2019-09-23T11:10:26Z
alotropjurnal:ART
IDENTIFIKASI PROFIL FITOKIMIA DAN UJI AKTIFITAS ANTIOKSIDAN EKSTRAK DIETIL ETER DAUN SURIAN (Toona sinensis (A.Juss) M.Roem) DENGAN METODE DPPH.
Nurhamidah, Nurhamidah
Nurdin, Hazli
Manjang, Yunazar
Dharma, Abdi
Surian Toona sinensis (A.Juss) M. Roem is a plant that is widely used by the community in the field of medicine such as fever, diarrhea, blood booster, tonic and others. This study aims to determine the secondary metabolite compounds found in leaf extracts of Toona sinensis and test the antioxidant activity using the 2,2-diphenyl-1- (2,4,6-trinitrophenyl) -hydrazinyl (DPPH) method. Identification of secondary metabolites by alkaloids, terpenoids, steroids, flavonoids, phenolics, saponins, coumarin and carotenoids. Toona sinensis leaf was extracted using methanol as a solvent. The resulting extract was saponified with a KOH solution in methanol. The saponification results were extracted again with diethyl ether solvent. The ether layer obtained was washed with distilled water, then dried with Na2SO4 and evaporated to dry, then tested its antioxidant activity. The identification results show Surian leaves contain all secondary metabolites except alkaloids. The antioxidant activity parameters of the Surian extract (Toona sinensis) are indicated by the% inhibitory and IC50 values. Test results showed diethyl ether extract had moderate category of antioxidant activity with IC50 122, 3752 ?g / mL
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9040
10.33369/atp.v3i1.9040
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9040/4431
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9041
2019-09-23T11:10:26Z
alotropjurnal:ART
HUBUNGAN IMPLEMENTASI CONTEXTUAL TEACHING AND LEARNING (CTL) DENGAN HASIL BELAJAR SISWA MATA PELAJARAN KIMIA DI KELAS X MIA SMA NEGERI 8 KOTA BENGKULU
Andiko, Pebri Tri
Rohiat, Salastri
Elvinawati, Elvinawati
This study aims to analyze the relationship of Contextual Teaching and Learning (CTL) implementation with students' learning outcomes in X class MIA SMA Negeri 8 Kota Bengkulu at 2017/2018 Academic year. This type of research is correlational research. The population in this research is class X MIA SMA Negeri 8 Kota Bengkulu 2017/2018 Academic year and research using total sampling technique where all population used also become sample of research with total 166 students. Data collection techniques in this study using questionnaires, observation sheets and students' chemistry learning results. Data analysis using Pearson correlational analysis and validation test, reliability, normality, linearity (with F test) , and hypothesis test. Based on the results of data analysis that has been done, obtained general conclusion of a positive relationship between the application of Contextual Teaching and Learning (CTL) with the results of students learningoutcomes in X class MIA SMA Negeri 8 Kota Bengkulu at 2017/2018 Academic year, indicated by the value rhitung obtained greater than the value of tabell r (0.704> 0.1281) with the level of correlation into the category of strong / high, it means there is a positive and strong relationship between the application of Contextual Teaching and Learning with student learning outcomesin X class MIA SMA Negeri 8 Kota Bengkulu at 2017/2018 Academic year.
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9041
10.33369/atp.v3i1.9041
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9041/4432
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9042
2019-09-23T11:25:33Z
alotropjurnal:ART
PEMBUATAN NANOPARTIKEL-PERAK EKSTRAK DAUN UBI JALAR ORANGE (Ipomoea batatas L.) DENGAN METODE BIOREDUKSI DAN UJI AKTIVITAS TERHADAP JUMLAH TROMBOSIT Mus musculus
Trinanda, Ririn
Sundaryono, Agus
Handayani, Dewi
This study aims to make silver nanoparticles (NPP) of orange Sweet potato extract (Ipomoea batatas L.) using bioreduction method and test the effect of giving silver nanoparticles - leaf extract of Ipomoea batatas L. orange (Ipomoea batatas L.) to the number of thrombocyte from male of Mus musculus induced by aspirin. The precursor used is 1 mM AgNO3 solution and as bioreductor is an antioxidant compound in orange sweet potato extract (Ipomoea batatas L.). The ratio of AgNO3 1 mM solution volume and orange sweet potato leaf extract is 9: 1 with 2 hours time. The characteristic test again obtained NPP is done using FTIR and Particle Size Analyzer (PSA) using Dynamyc Light Scattering method (DLS). The results showed that from the PSA analysis is known the average size of NPP – I. Batatas, L leaf extract is an average of 86.0 nm with a polydispersity value (PDI) of 0.17 < 1 that indicates that the NPP-leaf extract particle size distribution It is less homogeneous and are less stable.The results show that the administration of silver nanoparticles - orange sweet potato extract (Ipomoea batatas L.) can increase the platelet count of male mice significantly Dose of 0.014 g / Kgbb of 259,600 / mm3.
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9042
10.33369/atp.v3i1.9042
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9042/4439
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9043
2019-09-23T11:10:26Z
alotropjurnal:ART
oai:ojs.localhost:article/9046
2019-09-23T11:10:26Z
alotropjurnal:ART
PERBANDINGAN PEMBELAJARAN KOOPERATIF TIPE STRUCTURED NUMBERED HEADS (SNH) DAN NUMBERED HEAD TOGETHER (NHT) TERHADAP KEMAMPUAN BERPIKIR KREATIF SISWA KELAS X MIPA SMAN 6 KOTA BENGKULU
Elyani, Evi
Sumpono, Sumpono
Amir, Hermansyah
The purpose of this research is to measuring the comparison of students creative thinking ability between cooperative learning model type Stuctured Numbered Heads (SNH) and Numbered Head Together (NHT) on nomenclatur of chemical compounds material in curriculum 2013 of grade X MIPA SMA Negeri 6 Bengkulu city school year 2017/2018. This research is a quasi-experimental research with total population 118 students and sample 57 students with class X MIPA D as experiment class I that apply cooperative learning model type SNH and class X MIPA B as experiment class II applying cooperative learning model type NHT. Analysis of the data used are mean values, Percentage Indicator, normality test, homogeneity test, and hypothesis test (t test). The students' creative thinking ability in this study is seen from the difference between pretest and posttest. In the experimental class I, the average value of students creative thinking ability was 51,851 while the experimental class II was 46,916. The result of t test (? = 0,05) obtained tcount> ttable is 2,645> 2,0040 indicates the accepted hypothesis means that there is a significant difference between students' creative thinking ability using cooperative learning model type SNH and NHT, where the model of cooperative learning type SNH is more influential on students’ creative thinking ability compared with cooperative learning type model NHT.
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9046
10.33369/atp.v3i1.9046
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9046/4435
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9047
2019-09-23T11:10:26Z
alotropjurnal:ART
Preparasi dan Karakterisasi Katalis Mo-Ni/HZ dengan Metode Impregnasi untuk Cracking Katalitik Minyak Limbah Cair Pengolahan Kelapa Sawit menjadi Bahan Bakar Nabati
Lestari, Shinta
Sundaryono, Agus
Elvia, Rina
This study aims to determine the characteristics of Mo-Ni/HZ catalysts and test the ability of Mo-Ni/HZ catalysts in converting vegetable oils into biofuels through catalytic cracking reactions.Catalyst preparation is carried out by the impregnation method which begins with activation of natural zeolite.Impregnation is carried out by dissolution, reflux, filtration, drying and calcination.Catalyst characterization included the determination of the distribution of metals in zeolites using IR spectroscopic analysis and total acidity of the catalyst by ammonia adsorption gravimetric method.Preparation of samples prior to cracking is heating, degumming and bleaching.Catalytic cracking was carried out at 280oC using Mo-Ni/HZ catalyst for 100 minutes.The constituent components of the cracking results were analyzed by GC-MS and IR spectroscopy.The results obtained from the catalytic cracking process were then determined by physical characteristics which included density, viscosity, fog point and pour point test.Based on the shift of wave number in IR spectroscopy, it can be concluded that the Ni and Mo metals are embedded in the HZ.This Mo-Ni/HZ catalyst has total acidity of 8.39 mmol/gammonia.The results of the study prove that the Mo-Ni/HZ experiment proved to be able to crack oil frompalm oil processing wastewater by 91.46% to composition C=O ester CH aliphatic.The physical characteristics of cracking productshave parameters density of 0.93 g/cm3, a viscosity of 26.60 cSt, a fog point of 15oC and pour point of 11.67oC.
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9047
10.33369/atp.v3i1.9047
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9047/4436
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9048
2019-09-23T11:10:26Z
alotropjurnal:ART
PENERAPAN MODEL PEMBELAJARAN MENCARI PASANGAN DAN BERTUKAR PASANGAN DALAM KELOMPOK DISKUSI TERHADAP HASIL BELAJAR SISWA PADA MATERI SISTEM KOLOID KELAS XI IPA MAN 1 KOTA BENGKULU
Aprianika, Sella
Bahar, Amrul
Rohiat, Salastri
This study aims to determine differences in student learning outcomes using a model of learning make a match with a model partner switch the subject matter colloidal system class XI IPA MAN 1 Bengkulu City in the academic year 2017/2018. The research population of all classes XI IPA amounted to 4 classes with a total population of 151 students. The sampling of the research was done by normality test and homogeneity test before the study population. Obtained a sample of research that consists of 2 classes of class XI IPA 1 as an experimental class I that apply the model make a match and class XI IPA 2 as an experimental class II using a model parten switch. Student learning outcomes are seen from the postest score. Students' learning outcomes in the make a match class had an average of 82.714 while in the partner switch the average pair was 77.5. This shows that the model of make a match is more effectively used in the process of learning in class than the model of partner switch. From the t test-t test on both experiment classes is obtained tcount and ttable = 1.707> 1.666 (? = 0,05). The results show that H0 is rejected and Ha is accepted which means that there is a significant difference between the learning result of the students using make a match model and the learning model partner switch on the material of the colloidal system.
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9048
10.33369/atp.v3i1.9048
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9048/4437
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9049
2019-09-23T11:10:27Z
alotropjurnal:ART
PENERAPAN KEMOMETRIK PADA METODE CITRA DIGITAL UNTUK ANALISIS ION MERKURI (II) DENGAN INDIKATOR NANOPARTIKEL PERAK
Dinata, Angga Aprian
Firdaus, M. Lutfi
Elvia, Rina
Digital image method in quantitative analysis usually uses one of the RGB primary color components (Red, Green, Blue), so that not all digital image data can be extracted. Then needed a method that can render the whole RGB values as variables in quantitative analysis are known as chemometric. This research aims to know the influence of the application of chemometric against the sensitivity of the digital image. Chemometry method used is the Principal Component Regression (PCR) and Partial Least Square (PLS) using Unscramber X software from Camo software, USA.. This method is applied for the quantitative analysis of Mercury (II) ion with silver nanoparticles (NPP) immobilization on filter paper indicator. The research results showed that chemometric has a good influence against the level of the Limit of Detection (LOD) of the digital image, where the level of LOD with chemometric application of the Principal Component Regression (PCR) is 0.4311 ppb, and Partial Least Square (PLS) is 0.4310 ppb smaller than without the application of chemometric Single Linear Regression (SLR) at 0.837 ppb.
University of Bengkulu
2019-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9049
10.33369/atp.v3i1.9049
ALOTROP; Vol. 3 No. 1 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9049/4438
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9873
2019-12-19T22:01:33Z
alotropjurnal:ART
PENERAPAN MODEL PEMBELAJARAN AUDITORY, INTELLECTUALY DAN REPETITION (AIR) DENGAN MENGGUNAKAN MEDIA PEMBELAJARAN KARTU ARISAN UNTUK MENINGKATKAN AKTIVITAS DAN HASIL BELAJAR SISWA KELAS X MIA 1 SMAN 8 KOTA BENGKULU
Sumiati, Diana
Bahar, Amrul
Handayani, Dewi
This study aimed to improve learning activities and learning outcomes of students in class X MIA 1 of Senior High School (SMAN) 8 Bengkulu on the subject of chemical bonds through the application of Auditory, Intellectualy, and Repetition (AIR) learning models by using learning media with lottery card. This study is a classroom action research consisting of three cycles, each cycle consisting of four stages, planning, action, observation and reflection. In collection of data was done by non-test and test methods, teacher observation sheets, student observation sheets and post-test. The data was processed by using simple quantitative data analysis techniques, the total value of each student, the average value, the percentage of absorptive power, learning completeness and the average observation score.The results of the study in the 2018/2019 school year showed that the application of the Auditory Intellectualy Repitition learning model using learning media with lottery cards in class X MIA 1 of SMA Negeri 8 Kota Bengkulu could improve teacher activities, student activities and student chemistry learning outcomes. This can be seen from the average score of teacher activities in the first cycle to the third cycle in a row : 23, 27.5 and 31.5. Student activity also showed improvement in each cycle. The average score of student activity in cycle I to cycle III was sequentially 20, 25 29.5. Learning outcomes also increase in each cycle. This can be seen from the average value of the test results in each cycle, in the first cycle of 61.82, in the second cycle of 67.88, in the third cycle of 79.09. Classical absorption in cycle I, cycle II, cycle III are 61.82%, 67.88%, 79.09%, with the percentage of completeness learning in each cycle of 42%, 73%, and 87.8 %.
University of Bengkulu
2019-12-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9873
10.33369/atp.v3i2.9873
ALOTROP; Vol. 3 No. 2 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9873/4889
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9874
2019-12-19T22:22:34Z
alotropjurnal:ART
STUDY ON Hibiscus tiliaceus LEAVES AS ANTIBACTERIAL AND ANTIOXIDANT AGENTS
Samsudin, Mohamad Syahmie
Andriani, Yosie
Sarjono, Purbowatiningrum Ria
Syamsumir, Desy Fitrya
This study aimed to evaluate antioxidant and antibacterial activities of methanol, hexane, dichloromethane, ethyl acetate, and water crude sample fractions of H. tiliaceus leaves. Various type of samples play an important role to determining which compound that will give the positive results in antioxidant test (inhibiting free radical scavenging activity) which they probably have potency for preventing the cancer disease. Furthermore, those types of samples were also tested to the antibacterial test as their possibilities to be created as new antibiotics in the future. This research also focused on what compound groups that actually present in H. tiliaceus leaves by using the phytochemistry test. Antioxidant potency of H. tiliaceus leaves extracts for the radical scavenging activity for quantitative assay was measured by the 2,2-diphenyl-1-picrylhydrazyl (DPPH) method. The antibacterial potency was measured by the Muller Hinton Agar (MHA) by applied the sample chemical crude in the plate. The result showed that all chemical crude of H. tiliaceus leaves has high antioxidant property as methanol crude (MC) 308.416%; hexane crude (HC) 232.837%; dichloromethane crude (DC) 150.837%; ethyl acetate crude (EC) 73.623% and water crude (WC) 71.777% with respected to the readings of 100% from quercetin (Q) as a positive control. From antibacterial result, entire samples had shown the positive results towards both gram positive (Staphylococcus aureus and Bacillus subtilis) and gram negative bacteria (Klebsiella pneumonia and Escherichia coli). The ranges of the inhibition zone were both at 7-10 mm and 10-15 mm. The phytochemistry test determine that the samples actually contained a lot of compounds which were proteins, carbohydrates, phenols/tannins, flavonoid, terpenoids, glycosides and also steroid. It is clearly indicated that H. tiliaceus leaves have potential to be used against the antioxidant and also as new antibacterial agents
University of Bengkulu
2019-12-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9874
10.33369/atp.v3i2.9874
ALOTROP; Vol. 3 No. 2 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9874/4890
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/9911
2019-12-27T20:54:17Z
alotropjurnal:ART
PERBANDINGAN HASIL BELAJAR SISWA MENGGUNAKAN PEMBELAJARAN KOOPERATIF TIPE TEAM GAMES TOURNAMENT (TGT) DENGAN MEDIA ULAR TANGGA DAN MEDIA PUZZLE DI KELAS XI SMA NEGERI 01 BENGKULU TENGAH
Syafitri, Aisha
Amir, Hermansyah
Elvinawati, Elvinawati
This study aims to determine the comparison of student learning outcomes using cooperative learning type Teams Games Tournament (TGT) with media snake ladder and media puzzle in class XI SMA Negeri 01 Bengkulu Tengah Year 2017/2018 on the subject of colloidal system. This research is a quasi experimental research with the population of all students of class XI SMA Negeri 01 Bengkulu Tengah and the sample is XI MIPA 3 experiment I applying Snake Ladder media and XI MIPA 4 as experiment class II which apply puzzle media. Student learning outcomes in this study is seen from the difference between pretest and posttest values. In the experimental class I which uses snake ladder media, the average value of the increase in students' cognitive learning outcomes is 43.30. Whereas in the experimental class II that uses media puzzle, the average value of the increase in students' cognitive learning outcomes is 35.97. From a series of statistical tests conducted hypothesis testing using t-test with a significant level of 0.01 obtained tHitung> tTable (2.42> 2.39). The results showed that there was a significant difference between the learning outcomes of students who were taught by cooperative learning using Snake Media Appliance and Puzzle media. The result of this research can be concluded that in general the result of student learning by applying cooperative learning model of Team Games Tournament (TGT) type with snake ladder media is higher than with puzzle media on colloidal system subject.
University of Bengkulu
2019-12-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/9911
10.33369/atp.v3i2.9911
ALOTROP; Vol. 3 No. 2 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/9911/4895
Copyright (c) 2019 Alotrop
oai:ojs.localhost:article/10120
2020-01-14T11:33:32Z
alotropjurnal:ART
UPAYA PENINGKATAN SENSITIVITAS NANOPARTIKEL PERAK UNTUK ANALISIS ION MERKURI(II) SECARA CITRA DIGITAL DENGAN PENAMBAHAN NaCl
Prasetia, Edo
Firdaus, M. Lutfi
Elvinawati, Elvinawati
The very small concentration of mercury (Hg) in the environment is difficult to detect, so an accurate and sensitive method is needed in order to detect the concentration. Therefore, the purpose of this study was to develop an accurate and sensitive method based on the use of digital imaging methods and silver nanoparticles (AgNPs) as colorimetric sensors for mercury(II) ions (Hg2+) analysis. The process of making AgNPS is done by a bottom up method involving a reduction reaction. The precursor used is 1 mM AgNO3 solution and as bioreductor is an antioxidant compound present in extract of chili pepper (Capsicum frutescens L) with ratio 1: 9. Contact time variation 15, 30, 45, 60 min and 1, 2, 7 days. Addition of NaCl 0.5 and 1 M NaCl were used to increase the sensitivity of AgNPs as colorimetric sensors of Hg2+ ions. Digital Image Method is used to analyze Hg2+ ions at ppb concentration level. The results of the most optimum silver nanoparticles synthesized at the time of solar heating is 60 minutes. The addition of NaCl 0.5 M and 1 M into AgNPs is able to increase the sensitivity of AgNPs. Limit of Detection (LoD) of AgNPs added NaCl 0.5 M and 1 M was able to detect Hg2 + ions by 3.02 ppb and 2.46ppb.
University of Bengkulu
2019-12-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/10120
10.33369/atp.v3i2.10120
ALOTROP; Vol. 3 No. 2 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/10120/5067
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/10121
2020-01-14T11:38:18Z
alotropjurnal:ART
PERBANDINGAN HASIL BELAJAR KIMIA SISWA MENGGUNAKAN MODEL PEMBELAJARAN JIGSAW DAN THINK PAIR SHARE (TPS) DENGAN PENDEKATAN SCIENTIFIC PADA KELAS X IPA DI SMAN 3 KOTA BENGKULU TAHUN AJARAN 2018/2019
Pepi, Pepi
Amir, Hermansyah
Elvia, Rina
This study aims to compare the Think Pair Share (TPS) and Jigsaw learning models with the Scientific approach to the results and interest in learning chemistry in the mole concept material in class X MIPA SMAN 3 Kota Bengkulu. This research was carried out in January-April 2019. This type of research was a quasi-experimental study with a population of all classes of X MIPA totaling 180 students. How to obtain samples through normality and homogeneity tests through cluster random sampling technique, where two classes of research samples were obtained, namely Experiment 1 class which applied Think Pair Share (TPS) learning model and experimental class 2 which applied the Jigsaw learning model. Based on the results of the study it was concluded that the two learning models proved to be able to increase students' learning outcomes and interest in chemistry and reach KKM, namely 76 with the acquisition of the N-Gain Score in the Think Pair Share (TPS) learning model of 0.71 and in the Jigsaw learning model of 0, 79 where both values of N-Gain Score have a high category. The results of students' interest in learning chemistry in the experimental class 1 were 75.93% with good categories and the results of the learning interest in the experimental class 2 were 82.01% with very good categories. The results of hypothesis testing through t test on the cognitive aspect sig. (2-tailed) of 0.002 and in the affective aspect of 0,000. It states that there are significant differences in the results and interest in learning chemistry that apply Think Pair Share (TPS) and Jigsaw learning models with the Scientific approach.
University of Bengkulu
2019-12-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/10121
10.33369/atp.v3i2.10121
ALOTROP; Vol. 3 No. 2 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/10121/5068
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/10122
2020-01-14T11:41:47Z
alotropjurnal:ART
UJI AKTIVITAS ANTIBAKTERI DAUN JERUK KALAMANSI (Citrofortunella microcarpa) TERHADAP BAKTERI Staphylococcus aureus DAN Escherichia coli
Oktasila, Deza
Nurhamidah, Nurhamidah
Handayani, Dewi
This study aims to examine the antibacterial activity of ethanol extract and essential oil of Kalamansi citrus leaves (Citrofortunella microcarpa) against Staphylococcus aureus and Escherichia coli bacteria. The raw material of Kalamansi citrus leaves is obtained from the Village of Pondok Kubang, Bengkulu Tengah (3.70060S, 102.35780E). Ethanol extract from Kalamansi citrus leaves was obtained by maceration using ethanol 96%, then ethanol extract was made dilution concentration 40 ; 20; , 10; and 5%. The essential oil of Kalamansi citrus leaves is obtained by water-vapor distillation, then made variations of concentration 20;, 15;, 10; and 5%. The method used to test the antibacterial activity is the paper disc diffusion method , the antibacterial activity is shown by the diameter of the inhibiting zone formed. The data of antibacterial test result were analyzed by using One Way Anova test which showed the effect of treatment on the growth of test bacteria seen from the value (P <0,01) and continued by Duncan test to know the effect of the treatment. The results showed that ethanol extract of Kalamansi citrus leaves had antibacterial activity against S. aureus and E. coli bacteria with moderate inhibitory diameter is 7.20 and 5.73 mm at concentration 40%, while antibacterial activity on essential oil of Kalamansi citrus leaves is categorized as strong with inhibition zone diameter is 14.83 and 13.00 mm at concentration 20%.
University of Bengkulu
2019-12-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/10122
10.33369/atp.v3i2.10122
ALOTROP; Vol. 3 No. 2 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/10122/5069
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/10495
2020-02-29T19:22:32Z
alotropjurnal:ART
PERBANDINGAN MODEL PEMBELAJARAN KOOPERATIF TIPE STUDENT TEAMS ACHIEVEMENT DIVISION DAN TEAM GAMES TOURNAMENT BERBANTUAN MEDIA KARTU KATION ANION TERHADAP HASIL BELAJAR KIMIA
Rosmalara, Anisa
Elvia, Rina
Rohiat, Salastri
This study aims to determine the differences in student chemistry learning outcomes between classes that apply the Student Teams Achievement Division (STAD) learning model with a class that applies the Team Games Tournament (TGT) learning model to chemical compounds. This type of research is quasi-experimental with a population of class X IPA Academic Year 2018/2019 which amounts to 204 students. Samples were obtained from the results of the normality test and homogeneity test, namely class X IPA 4 which applied the STAD learning model with cation anion media and class X IPA 6 which applied the TGT learning model with anion cation card media. This study was conducted in January-March 2019. Analysis of the data used is the average (mean), normality test, homogeneity test, and hypothesis testing (u test). In general, the two models were able to improve learning outcomes, where the STAD learning model obtained higher results, namely 79.723. Data on students' chemistry learning outcomes were obtained from the pretest and posttest values where the average value of the increase in cognitive learning outcomes for the STAD class and the TGT class was 57,222 and 46,944. Through a series of statistical tests hypotheses were tested using the u test with a significant level (? <0.05) indicating the value (Sig. 2-tailed) of 0,000. This shows that there are significant differences in learning outcomes between classes applying the STAD learning model assisted by anion cation cards with classes that apply the TGT learning model assisted by anion cation cards.
University of Bengkulu
2019-12-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/10495
10.33369/atp.v3i2.10495
ALOTROP; Vol. 3 No. 2 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/10495/5198
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/10496
2020-02-29T19:31:42Z
alotropjurnal:ART
PENGARUH KADAR Aspergillus niger TERHADAP PRODUKSI BIOETANOL DARI BONGGOL PISANG KEPOK ( Musa paradisiaca L)
Junaini, Junaini
Elvinawati, Elvinawati
Sumpono, Sumpono
This study aims to determine the effect of Aspergillus niger levels on bioethanol production in banana cobs using Saccharfication Simultation Fermentation (SSF) method. This research uses banana kepok (Musa paradisiaca L.) obtained from Enggano Island of Bengkulu Province. Enggano Island is one of the outermost islands of Bengkulu Province which has a coordinate point of 5023'25,000 '' LS - 102014'16,000 '' BT. Samples of banana done preparation before the hydrolysis and fermentation process by smoothing the banana cobs using a blender until it becomes mush. Samples in the form of slurry were then added by Aspergillus niger and Sccharomyces cerevisiae. Hydrolysis performed for 72 hours which then continued with the fermentation process for 5 days. In the study there were 5 treatments: addition of Aspergillus niger 107 CFU/mL, addition of 10 mL Saccharomyces cerevisiae, addition of 10 mL Saccharomyces cerevisiae + Aspergillus niger 106 CFU/mL, 10 mL Saccharomyces cerevisiae + Aspergillus niger 107CFU/mL and 10 mL Saccharomyces cerevisiae + Aspergillus niger 108CFU/mL. The fermentation results were distilled and then measured the ethanol content by the specific gravity method. Ethanol content obtained from each treatment were 3.995%, 6.218%, 6.825%, 9.065%, and 12.348%, respectively. From one-way analysis test can be obtained the value of Fcount and Ftabel respectively are 25.73 and 5.19, so the value of Ftable< Fcount which means each treatment has a different result significantly.
University of Bengkulu
2019-12-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/10496
10.33369/atp.v3i2.10496
ALOTROP; Vol. 3 No. 2 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/10496/5199
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/10497
2020-02-29T19:39:41Z
alotropjurnal:ART
PERBANDINGAN MODEL PEMBELAJARAN KOOPERATIF TIPE THINK TALK WRITE (TTW) DAN CREATIVE PROBLEM SOLVING (CPS) TERHADAP MINAT DAN HASIL BELAJAR KIMIA SISWA
Pratiwi, Ghea Sefriza
Bahar, Amrul
Elvia, Rina
The purpose of this study is to describe the comparison of Think Talk Write learning models and Creative Problem Solving learning models to the interests and learning outcomes of chemistry in basic chemical law material. This research was conducted in January-May 2019. The research conducted was a kind of quasi-experimental research. The population of this study was class X MIA, totaling 136 students in SMAN 8 Kota Bengkulu in the academic year 2018/2019. Sampling was carried out after the normality and homogeneity test, so the X MIA 2 class was selected using Think Talk Write and X MIA 3 models that used the Creative Problem Solving model with a total of 68. Analysis of the data used was mean, normality test, test homogeneity, interest questionnaire analysis, N-Gain Score test and hypothesis test (t test). In general, both of these learning models are able to increase students 'interest and learning outcomes of chemistry, where the percentage of students' interest in learning chemistry in the Think Talk Write model is 80.5% and categorized as good, for the class of Creative Problem Solving model the percentage is 76.6% and also categorized as good. For the value of N-Gain score on Think Talk Write (TTW) class is and categorized as high while in the Creative Problem Solving class is 0.62 and is categorized as medium. The t-test results on the affective aspects are sig. (2-tailed) of 0.015 and on the cognitive aspect of 0.001. It states that there are significant differences in the interest and learning outcomes of chemistry that apply the Think Talk Write (TTW) learning model and Creative Problem Solving
University of Bengkulu
2019-12-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/10497
10.33369/atp.v3i2.10497
ALOTROP; Vol. 3 No. 2 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/10497/5200
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/10498
2020-02-29T20:12:42Z
alotropjurnal:ART
SINTESIS METIL ESTER DARI LIMBAH KELAPA SAWIT DENGAN SONOCHEMISTRY DAN CRACKING MENJADI BIOFUEL DENGAN KATALIS CrMo/HZ
Dhani, Jertadi Putri
Sundaryono, Agus
Handayani, Dewi
This study aims to calculate the percentage methyl ester converted to biofuel through catalytic cracking reaction,analyzes component and determine characteristics using catalyst CrMo/HZ. This research begins with impregnation sample preparation which includes heating oil,degumming,bleaching and determination free fatty acid (FFA). Methyl ester obtained from liquid waste conversion crude palm oil through an esterification and transesterification reaction with H2SO4 and NaOH catalyst with sonochemistry methode is a method that utilizes ultrasonic waves origanating from a device is ultrasonic cleaner for one hour at temperature 60oC. The methyl ester obtained was cracked with a CrMo/HZ catalyst which was carried out for 2 hours at temperatur 380oC. To find out the components of compounds formed in methyl ester, an analysis was performed using GCMS then characteristics of biofuel are determined from the result of catalytic cracking obtained through acid number testing,density,viscosity,pour point and fog point. The result obtained from the conversion of methyl ester to biofuel with Crmo/HZ Catalyst Is 60,17% And For Testing The Physical Characteristics Of Biofuel Namely The Acid Number 1,87 Mg KOH/G, density 0,804 g/cm3, viscosity 1,162 Cst, pour point 0oC and fog point 1,4oC. The result of cracking produce a consituent component of biofuel namely gasoline 33,67%, kerosene 16,26%, gas oil 10,24% beside that, there are still methyl ester as much as21,89%.
University of Bengkulu
2019-12-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/10498
10.33369/atp.v3i2.10498
ALOTROP; Vol. 3 No. 2 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/10498/5201
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/10507
2020-03-01T17:02:09Z
alotropjurnal:ART
IMPLEMENTASI MODEL PEMBELAJARAN LEARNING CYCLE 5E PADA MATERI HIDROLISIS GARAM DI KELAS XI MIPA SMAN 1 BENGKULU TENGAH TAHUN AJARAN 2018/2019
Safitri, Isnaini
Handayani, Dewi
Rohiat, Salastri
This study aims to determine the effect of the implementation of the 5E Learning Cycle learning model on increasing mastery of concepts in the subject matter of salt hydrolysis. This research was conducted at SMAN 1 Bengkulu Tengah in the 2018/2019 class XI MIP academic year in one meeting. The trial implementation of the 5E Learning Cycle model uses a pre-experimental research design with the form of one-group pretest-posttest design. The study was conducted in February 2019 at SMAN 1 Bengkulu Tengah. The population in this study were students of class XI MIPA in SMA Negeri 1 Bengkulu Tengah academic year 2018/2019 which amounted to 126 people. Determination of the study sample was carried out by testing the normality of the population. The study sample was taken using simple random sampling technique obtained by students of class XI MIPA 1, the number of students was 31 people. The instruments used consisted of student response questionnaire sheets and concept mastery assessment sheets. Student response data, mastery of concepts were analyzed descriptively and their improvement was analyzed by analysis of gain scores. The results showed that students gave a positive response to the 5E learning cycle model with an average value of 4.2 from a maximum value of 5 which indicated that students felt greatly helped by learning with the 5E Learning Cycle model. This is also supported by a high score increase on mastery of concepts which obtained an average value of 76.97 which is in the effective category. Based on the results of the study, it was concluded that the implementation of the 5E learning cycle model in the subject matter of effective salt hydrolysis to improve mastery of concepts in class XI MIPA SMAN 1 Bengkulu Tengah Academic Year 2018/2019.
University of Bengkulu
2019-12-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/10507
10.33369/atp.v3i2.10507
ALOTROP; Vol. 3 No. 2 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/10507/5204
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/10508
2020-03-01T17:12:39Z
alotropjurnal:ART
PERBANDINGAN SENSITIVITAS NANOPARTIKEL PERAK DENGAN REDUKTOR ALBUMIN DARI TELUR AYAM DAN BEBEK UNTUK ANALISIS MERKURI
Azhar, Fikri Fadillah
Elvinawati, Elvinawati
Nurhamidah, Nurhamidah
The aims of this study were determine the protein level of chicken egg albumin (Gallus Sp.) And duck egg albumin (Anas domestica) also optimum conditions, sensitivity, and LOD values of silver nanoparticles (NPP) synthesized using bioreductors of chicken (Gallus Sp.) egg albumin and duck (Anas domestica) egg albumin for analysis of mercury ions (II). This research was conducted at the Laboratory of Chemistry FKIP UNIB on April - July 2019. Protein levels of chicken egg albumin and duck egg albumin were obtained in the amount of 0.210 gr / 100 ml and 0.234 gr / 100ml, respectively. The NPP synthesized in this study was carried out by mixing silver precursors derived from 10 mM AgNO3 solution and 1% albumin solution as bioreductors of each chicken egg albumin solution and duck egg albumin. The optimum condition of NPP synthesized using chicken egg albumin bioreductor and duck egg albumin was the same, with the number of comparisons between AgNO3 and albumin solutions namely 1: 2 and stirring time of 30 minutes. The results showed that NPP synthesized using chicken egg albumin and egg albumin ducks had good sensitivity to Hg metal with the addition of Hg metal concentrations above 50 ppm that be marked with significant color changes from brownish yellow to clear. LOD values in each NPP synthesized using bioreductors of chicken egg albumin and duck egg albumin were 3334 ppm and 2,238 ppm, so that NPP synthesized using bioreductor of duck egg albumin was more sensitive than NPP synthesized using bioreductor of chicken egg albumin for mercury metal analysis. This is influenced by the differences of protein levels of chicken egg albumin and duck egg albumin where the protein level of duck egg was higher than the protein level of chicken egg.
University of Bengkulu
2019-12-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/10508
10.33369/atp.v3i2.10508
ALOTROP; Vol. 3 No. 2 (2019)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/10508/5205
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13693
2020-12-01T15:22:53Z
alotropjurnal:ART
PENERAPAN MODEL PEMBELAJARAN TIME TOKEN UNTUK MENINGKATKAN KEMAMPUAN BERTANYA DAN HASIL BELAJAR KIMIA SISWA KELAS X MIPA 1 SMAN 09 KOTA BENGKULU TAHUN AJARAN 2017/2018
Damayanti, Ufi
Bahar, Amrul
Rohiat, Salastri
Research the act of this class carried out of date 01 February 2018 – 08 March 2018aims to (1) enhance the capacity of ask a student to lose their; (2) increase yields of of students to study, declaration of relinquishing his her to see liveliness of teachers and students in the process of learning to promote disorder to. A subject in this research is a student X MIPA 1 SMAN 09 city Bengkulu school year 2017/2018 on the subject of redox reactions, which amounted to 28 students. The research results show that the implementation of learning cooperative type time token can improve the ability ask students, improve learning outcomes students, and improving liveliness teachers and students in learning in subject matter reaction redoks the result of which have be completed in cycle 3rd. On the ability of cycle I ask students 75 % rate of C1, 15 % rate of C2, 10 % rate of C3 and 28,57 % student learning. Cycle II ask students 65,22 % rate of C1, 21,74 % rate of C2, 13.04 % rate of C3 with 64,29 % student learning. The cycle III ask student 4,35 % rate of C1, 78,26 % rate of C2, and 17,39 % rate of C3, with 89,29 % student learning (who has achieved indicators of the quality of the success of research and KKM). To liveliness teachers from the cycle I, II, and III each 25, 27, and 30, while liveliness students in each 21, 24, and 28
University of Bengkulu
2020-12-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13693
10.33369/atp.v4i1.13693
ALOTROP; Vol. 4 No. 1 (2020)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13693/6729
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13695
2020-12-01T15:40:36Z
alotropjurnal:ART
ANALISIS KADAR MERKURI PADA BIOTA AIR DENGAN NANOPARTIKEL PERAK SECARA CITRA DIGITAL DI LOKASI PENAMBANGAN EMAS KABUPATEN LEBONG
Nordan, Hendry
Firdaus, Mochamad Lutfi
Elvia, Rina
This study aimed at determining of how the sensitivity of silver nanoparticles (NPP) in detecting metal mercury in aquatic biota samples through digital imagery. The Sampling of aquatic biota was carried out in the gold mining location of Lebong Tambang village in Lebong district (102 ° 12'00 "-102 ° 18'05" BT and 3 ° 10'00 "-3 ° 17 ' 00 "LS.) The aquatic biota samples analyzed included fish, shellfish, shrimp and plants as well as comparison samples such as water and sediment. The Analysis of mercury level was carried out from December 2018 - March 2019 by using NPP of digital imagery method. The digital imagery method was used as a detector to replace the conventional spectrophotometer. The result of mercury level in aquatic biota with NPP in digital imagery was susceptible compared to the UV-Vis spectrophotometry method. It can be seen from the Limit Of Detection (LOD) score of the digital imagery method with the SLR data analysis technique by using a digital camera that is equal to 2.305 ppb, where the score was smaller than the LOD value in spectrophotometry which is 300 ppb. The results of the analysis of mercury level by using digital imagery method were obtained the concentration on pool shells of 196.8 ppb, in pond fish samples of 155.7 ppb, in shrimp samples of 81.2 ppb, in river fish samples of 81.1 ppb, and in plant samples of 50.9 ppb. thus, these results indicate that the presence of mercury ions in the samples of aquatic biota tested has levels above the threshold, which means samples of fish, shrimp, shellfish and plants were risk to be consumed
University of Bengkulu
2020-12-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13695
10.33369/atp.v4i1.13695
ALOTROP; Vol. 4 No. 1 (2020)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13695/6730
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13704
2020-12-02T11:30:13Z
alotropjurnal:ART
PENGEMBANGAN MODUL LARUTAN PENYANGGA BERBASIS PENDEKATAN TERPADU STEM
Tripripa, Amelia
Amir, Hermansyah
Rohiat, Salastri
This study aims to determine the feasibility, student response and effectiveness of buffer solution modules based on the integrated STEM approach developed. This research is a development research adapted from the development model of Borg and Gall. The study was conducted in January - April 2019 at SMAN 09 Kota Bengkulu. The research data were obtained from the results of interviews, validation questionnaires, student response questionnaires and understanding tests. The selection of the trial class was carried out through a normality test for all class XI MIPA with a total subject of 111 students. The results of the trial were obtained by two respondent classes namely XI MIPA 1 for trial use and XI MIPA 2 for product testing with a total of 38 students. The results of the validation test obtained an average assessment of material experts 4.3 and 4.7 media experts who were both in the range of 4,2 ? < 5 with a very valid classification. In product testing and usage tests, the average score of students' responses was 4.3 with a very interesting classification. The effectiveness of the module is seen from the understanding test with the percentage of student learning completeness of 86.21% reaching the KKM which is categorized as effective. So it can be concluded that, in general, the module based on the solution based on the STEM approach developed can be used in the learning process in class XI MIPA SMAN 09 Kota Bengkulu in the academic year 2018/2019.
University of Bengkulu
2020-12-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13704
10.33369/atp.v4i1.13704
ALOTROP; Vol. 4 No. 1 (2020)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13704/6734
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13705
2020-12-02T12:59:17Z
alotropjurnal:ART
ISOLASI DAN IDENTIFIKASI BAKTERI ASAM LAKTAT DARI MAKANAN TRADISIONAL SUKU REJANG DI PROVINSI BENGKULU: “LEMEA”
Kurnia, Moga
Amir, Hermansyah
Handayani, Dewi
This study aims to specify the genus of lactic acid bacteria (LAB) in "lemea" and measure the activity of LAB isolates in producing lactic acid. The sample "lemea" came from one of the home industries in Daspetah Village, Ujan Mas District, Kepahiang Regency which was fermented for 7 days. The research was conducted from February to May 2019, at the Learning Laboratory of Biology and Chemistry, Faculty of Teacher Training and Education, University of Bengkulu. Isolation of LAB from "lemea" using selective media De Man, Rogosa and Sharpe (MRS) supplemented with 0.5% CaCO3 using the pour plate method. The steps of this study include, sampling "lemea", isolation of LAB, identification of macroscopic and microscopic bacteria (Gram staining) and determining% of lactic acid levels using the titration method to measure the activity of LAB isolates. The results identification of BAL isolates in "lemea" obtained two LAB isolates with codes of LK1 and LK2 isolates that had cocci, Gram positive and did not have spores. The measurements results of LAB activity in producing lactic acid, for LK1 isolates, obtained lactic acid levels of 1.92% while LK2 isolates were 1.56% of the local mass. According to the results identification,LK1 and LK2 isolates are the genus Leuconostoc and the highest activity in producing lactic acid in LK isolates.
University of Bengkulu
2020-12-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13705
10.33369/atp.v4i1.13705
ALOTROP; Vol. 4 No. 1 (2020)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13705/6737
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13707
2020-12-02T14:56:44Z
alotropjurnal:ART
PENGEMBANGAN E-MODUL KIMIA BERBASIS METAKOGNISI MENGGUNAKAN APLIKASI EDMODO
Indira, Shiba Meike
Sundaryono, Agus
Elvia, Rina
Metacognition is one of the factors that influence academic achievement, so it is very important in each student's learning activities. The objective of this research was to find out the level of feasibility and students response to E-chemistry-based metacognition using the edmodo application as teaching material to train students' knowledge and metacognition experience of students of the XI MIPA class of SMA Negeri 2 Kota Bengkulu T/P 2018/2019 on acid-base material. This research was an Research & Development (R&D) using the 4D development model limited to the development stage. The development of this emodule uses the edmodo application and in its using the flipped classroom learning model. Information worthy of being used as teaching of expert assessments and student responses to limited testing and field testing. The assessment of e-module was carried out by media experts, it was obtained that e-module is very feadible to use without revision with an evaluation percentage of 93%, an assessment by material experts and practitioners ( chemistry teacher) was very feasible to use without revision with an evaluation percentage of 92%, then the metacognition –based was assessed by material experts was obtained e- module was very feasible to use without revision with a percentage of 88% so that based on the results of expert evaluations, e-module could testedon a limited trial class and field trial. Sample selection in limited trials and field trials obtained from the results of normality tests conducted on january 3,2019 from the popuation of class XI Mipa A- XI Mipa F as many 190 students obtained 15 students XI Mipa C as samples ini limited trials and 31 students XI Mipa E in the field trial. Response of students in limited trials carried out on january 14,2019 and field tests on january 30,2019 amounting to 86% and 84% this shows that the use of emodules is very teasible to use as teaching materials and obtained information that e-module can train the ability of metacognition students of the XI MIPA SMA Negeri 2 Kota Bengkulu T/P 2018/2019 in particular the knowledge and metacognition experience of student from less trained to being trained.
University of Bengkulu
2020-12-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13707
10.33369/atp.v4i1.13707
ALOTROP; Vol. 4 No. 1 (2020)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13707/6740
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13708
2020-12-02T15:31:42Z
alotropjurnal:ART
UJI SITOTOKSIK DAN AKTIVITAS ANTIBAKTERI EKSTRAK DAUN PANDAN LAUT (Pandanus Odorifer) TERHADAP BAKTERI Staphylococcus aureus
Puspasari, Shinta
Nurhamidah, Nurhamidah
Amir, Hermansyah
This study aims to determine the activity of marine pandanus extract(Pandanus odorifer) as cytotoxic and antibacterial to Staphylococcus aureus bacteria. This research begins with phytochemical test conducted to find out the secondary metabolite compounds contained in the leaves of P. odorifer. Cytotoxic testing was performed using BSLT method. An antibacterial test was performed against the activity in inhibiting the growth of S. aureus bacteria using a modified disc diffusion method. The results of phytochemical tests showed that ethanol extract of pandanus leaves contain saponin, flavonoids, tannin and terpenoid compounds. The results of cytotoxic test of sea pandan have a very strong toxic level with LC50 value of 4.3557 ppm.The result of measurement of the highest inhibiting zone diameter was obtained at the concentration of 5x104 ppm is 6 mm with the power of inhibitory that is medium. Based on the results of this study can be concluded that the leaves of sea pandan are cytotoxic and have activity as antibacterial
University of Bengkulu
2020-12-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13708
10.33369/atp.v4i1.13708
ALOTROP; Vol. 4 No. 1 (2020)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13708/6741
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13709
2020-12-02T22:08:30Z
alotropjurnal:ART
PENGEMBANGAN E-MODUL KIMIA BERBASIS KEMAMPUAN BERPIKIR KREATIF DENGAN MENGGUNAKAN KVISOFT FLIPBOOK MAKER
Romayanti, Cici
Sundaryono, Agus
Handayani, Dewi
The aim of this research is to determining level of feasibility and response of students from the development of e-modules in chemistry course based on creative thinking ability using the Kvisoft Flipbook Maker on material electrolyte and non-electrolyte solution in SMA Negeri 9 Kota Bengkulu. The type of research used is R & D (Research & Development), which uses the ADDIE development model (analysis, design, development, implementation, evaluation) with the limitation of stage until implementation. The results of this research show that the chemistry-based E-Module based on creative very feasible and feasible to use with the validation results from media experts was 97.7%, material expert validation was 90.2%, readability the small group trials conducted by 9 students in class X MIPA 2 was 97.04% and student responses in the large group trial conducted by 25 students in class X MIPA 1 was 86.4% (very feasible category). This shows that e-modules in chemistry course based on the ability to think creatively by using the kvisoft flipbook maker are very suitable to be used in the learning process
University of Bengkulu
2020-12-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13709
10.33369/atp.v4i1.13709
ALOTROP; Vol. 4 No. 1 (2020)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13709/6747
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13711
2020-12-03T11:46:56Z
alotropjurnal:ART
PROFIL FITOKIMIA DAN UJI SITOTOKSIK EKSTRAK ETANOL TUMBUHAN Zanthoxylum acanthopodium DC (ANDALIMAN) MENGGUNAKAN METODE BSLT
Panggabean, Liis
Nurhamidah, Nurhamidah
Handayani, Dewi
The purpose of this study was to determine the phytochemical profile of Zanthoxylum acanthopodium DC plant (Andaliman) and to know the extract part of plant ethanol Z acanthopodium DC as the best anticancer agent. Root basal samples, stem bark, leaves and fruit Z acanthopodium DC as much as 3 Kg, then dried up and smoothed. Fine samples of root, bark, leaves and fruit of Z acanthopodium DC were each weighed 450 gr and each sample was extracted using 5 L ethanol solvent. Root extract, bark, leaves and fruit Z anthoxylum acanthopodium DC obtained from extraction weighed as much as 1 g, then each of them in concentrations of 10, 100, and 1000 ppm. Cytotoxic tested using BSLT method with shrimp larvae of 10 tail, then determined LC50 by using relationship between probit and log of concentration. Each sample of fine roots, bark, leaves and fruit Z acanthropodium DC were weighed 3 grams. Then press the phytochemical profile. Phytochemical profile test results of each sample of acanthopodium DC Z showed the presence of alkaloids, flavonoids, tannins, terpenoids and saponins. The largest alkaloid content is found on the skin of stems and roots (++) with Papaya leaf comparison, the largest flavonoid content of bark (++) skin with peach flower compound, tannin leaf and tanug (+++) seedlings with Avocado seed comparator, and the largest Kandugan saponin on bark (+++) with the comparative Starfruit Wuluh. In the cytotoxic test results, each leaf extract of stem, leaves, roots and Z acanthopodium DC fruit has potential as an anticancer agent because the liberating LC50 in each sample is in the range 30-1000 ppm. The extract part of the stem bark has the greatest potential as an anticancer compared to fruits, leaves and roots. Because bark leaf extract has LC50 so that 57,677 ppm compared to root of 65,313 ppm, leaves of 77, 983 ppm, and fruit of 191,426 ppm. Usually root samples, stem bark, leaves and fruit Z acanthopodium DC can be used as an anticancer because of the content of flavonoids, saponins, alkaloids, tannins, and terpenoids.
University of Bengkulu
2020-12-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13711
10.33369/atp.v4i1.13711
ALOTROP; Vol. 4 No. 1 (2020)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13711/6766
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13714
2020-12-03T14:39:29Z
alotropjurnal:ART
ANALISIS MISKONSEPSI SISWA PADA MATERI KONSEP REDOKS MENGGUNAKAN CERTAINTY OF RESPONSE INDEX (CRI) DI SMA NEGERI 9 KOTA BENGKULU
Yuniarti, Endah
Bahar, Amrul
Elvinawati, Elvinawati
This research aimed to describe the student misconceptions and find out the cause of misconceptions on Redox Reaction lesson at the tenth grade of Senior High School 9 Bengkulu in 2018/2019 Academic Year. Research conduct on April 15th until May 24th, 2019. The design of this research is descriptive method. The samples were taken through simple random sampling technique are 67 students of tenth grade MIPA SMA N 9 Kota Bengkulu so that 30 students were sampled. Essay test by Certainty of Response Index (CRI) and interview were used as the instruments of this research. Based on the analysis of research data shows there are misconceptions students. The analysis results show that misconceptions occurred at all sub concept on redox concept so the percentage of misconceptions that occur amounted to 35,7% in the overall student. The results showed the highest percentage of misconceptions in the amount of 46% at sub concept to determine reduction oxidation based on oxidation number on molecules and ion. The lowest percentage of misconceptions in the amount of 23% at indicator to in the sub concept of understanding oxidation and reduction in a redox reaction in terms of changes in oxidation number. Based on the results of interviews, causes of student misconception are derived from internal and external factors. Internal factors are derived from students such as students' associative thinking, student apperception and wrong intuition, students' abilities are lacking, low of students' motivation and learning interests during the learning process, students' learning methods, and students' selfconfidence in CRI values and external factors such as methods learning and limited learning resources.
University of Bengkulu
2020-12-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13714
10.33369/atp.v4i1.13714
ALOTROP; Vol. 4 No. 1 (2020)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13714/6767
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13715
2020-12-03T14:51:52Z
alotropjurnal:ART
PENENTUAN POTENSI EKSTRAK KULIT BATANG TUMBUHAN SIKKAM (Bischofia javanica Blume) SEBAGAI ANTIOKSIDAN DENGAN METODE DPPH DAN SITOTOKSIK DENGAN METODE BSLT
Manurung, Dapot Parulian
Sundaryono, Agus
Amir, Hermansyah
This study aims to determine the level of antioxidant activity of Sikkam bark extract (Bischofia javanica Blume) and its potential as an anticancer agent. This research was conducted in November 2018 - April 2019 in the Laboratory of Chemical Education Guidance and Counseling and Basic Science Laboratory, University of Bengkulu. The sample in this study was obtained from Gunung Mariah village in Simalungun district, North Sumatra. The method used in this study was extraction using maceration, liquid-liquid fractionation, phytochemical test, DPPH (Diphenylpicrylhiydrazyl) test and BSLT test (Brine Shrimp Lethality Test). Extraction maceration using ethanol 96%, fractionation using a solvent n-hexane and ethyl acetate, phytochemical tests using Mayer's reagent, Lieberman-Burchard, FeCl3 1% and H2SO4 2N, antioxidant test using DPPH (1,1-diphenyl-2-picrylhydrazyl) and cytotoxic tests using shrimp Artemia salina Leach larvae. The results of the study on maceration of 800 grams of Sikkam bark obtained a crude extract of 53.6 grams (6.7%). Fractionation from 10 grams of crude extract obtained 7.24 gram ethanol fraction (72.4%), ethyl acetate fraction 2.14 gram (21.4%) and n-Hexane fraction 0.39 gram (3.9%). Phytochemical test results obtained the content of alkaloids, flavonoids, tannins, saponins and terpenoids with the highest yield on tannin compounds. The antioxidant activity test results obtained IC50 values in crude extracts of 20.94 ppm, ethanol fraction 36.29 ppm, ethyl acetate fraction 83.28 ppm and n-Hexane fraction 39.13 ppm which showed that crude extract, ethanol fraction, n-Hexane fraction were categorized as very strong antioxidants and Ethyl acetate fraction is categorized as a strong antioxidant. The cytotoxic test results using crude extract obtained an LC50 value of 54,827 ppm which showed that Sikkam bark extract was toxic so that it was potential as an anticancer agent.
University of Bengkulu
2020-12-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13715
10.33369/atp.v4i1.13715
ALOTROP; Vol. 4 No. 1 (2020)
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13715/6768
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13731
2020-12-13T22:28:18Z
alotropjurnal:ART
oai:ojs.localhost:article/13832
2021-07-07T12:14:58Z
alotropjurnal:ART
PENGARUH MODEL PEMBELAJARAN FLIPPED CLASSROOM TERHADAP HASIL BELAJAR KIMIA SISWA PADA MATERI LARUTAN PENYANGGA DI SMAN 5 KOTA BENGKULU
Khumairah, Rantika
Sundaryono, Agus
Handayani, Dewi
The purposes of this study is to know student learning outcomes of chemistry using flipped classroom learning model and know influence of flipped classroom learning model to on buffer solution. The study was conducted in February-March of 2019 in SMAN 5 Bengkulu City This study is pre-experimental design with one-grup pretes-posttest design. Population of this study is all of XI MIPA’s student which a total of 216 students with sample of this study is XI MIPA 5’s student which a total of 36 students. Technique of sampling in this study is used with purposive sampling technique. Instrument of this study used test of learning outcomes with 20 items pretest and posttest. Analysis of the data used are mean values, normality test, homogeneity test, and t-test to the student learning outcomes. Based on normality test and homogeneity test obtained that pretest and posttest have normal distribution and distributed to homogeneous. Average value of pretest and posttest are 60,1 and 80,0. The result of hypotheses using t-test showed that value of significance is 0.000 < 0.05, so flipped classroom model influenced of significance to student learning outcomes. The result of this study showed that flipped classroom learning model can positive influence to learning outcomes and increased student learning outcomes on buffer solution in XI MIPA 5 SMA N 5 Bengkulu city on academic year of 2018/2019.
University of Bengkulu
2020-12-04
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13832
10.33369/atp.v4i2.13832
ALOTROP; Vol. 4 No. 2 (2020); 92-97
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13832/6831
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13833
2021-07-07T12:14:58Z
alotropjurnal:ART
ISOLASI BAKTERI DARI TANAH TEMPAT PEMBANGAN AKHIR (TPA) AIR SEBAKUL SEBAGAI AGEN BIODEGRADASI LIMBAH PLASTIK POLYETHYLENE
Sari, Desy Purnama
Amir, Hermansyah
Elvia, Rina
This study aims to obtain the bacteria of Pseudomonas from the land of TPA Air Sebakul Bengkulu City as a plastic degrading agent and measure the ability of bacteria to degrade Low Density Polyethylene (LDPE) and Oxium plastic. The research was conducted from February to August 2019, at the Laboratory of Biology and Chemistry Learning, Faculty of Teacher Training and Education, University of Bengkulu. Air Sebakul landfill samples were taken at the coordinate point 3o49 '27.8 "S 102o20 '48.4" E. Isolation of plastic degrading bacteria using selective media King's B Agar added with 2% Polyethylen Glycol (PEG) to test the ability to develop bacterial isolates in plastic-based media. The steps of this research are bacterial isolation, bacterial purification and bacterial selection, macroscopic and microscopic identification of bacteria (Gram staining) and plastic biodegradation test with Mineral Salt Agar (MSM) media. Determination of the% weight loss of LDPE and oxium plastics in the biodegradation process was carried out for 30 days with time variations of 10, 20 and 30 days. The results of bacterial isolation based on morphological characteristics and gram staining test of P-1 bacterial isolate have similarities with Pseudomonas aeruginosa. So that the P-1 bacterial isolate is thought to be a Pseudomonas aeruginosa bacterium. The bidoegradation of LDPE and oxium plastics with isolates of P-1 bacteria for 10, 20 and 30 days respectively was able to degrade oxium plastics by 2.43, 5.17 and 9.86% while LDPE plastics by 1.13, 2 and 1 , 17%.
University of Bengkulu
2020-12-04
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13833
10.33369/atp.v4i2.13833
ALOTROP; Vol. 4 No. 2 (2020); 98-106
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13833/6832
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13834
2021-07-07T12:14:58Z
alotropjurnal:ART
PERBANDINGAN MODEL PEMBELAJARAN PROBLEM SOLVING DAN PROBLEM BASED LEARNING TERHADAP KEMAMPUAN BERPIKIR KRITIS SISWA KELAS XI MIA MAN 2 KOTA BENGKULU
Sani, Ida Nurjelita
Bahar, Amrul
Elvinawati, Elvinawati
The aim of this study to determine the comparison of Problem Solving (PS) and Problem Based Learning (PBL) models to critical thinking skills of student on buffer solution material. This type of research is quasi experimental research with posttest only control group design research design. The population of this study is all class XI IPA of MAN 2 Bengkulu City academic year 2018/2019 as many 133 students. The analysis of the data was used the normality test, homogeneity test, and hypothesis test. The research sample was taken by purposive sampling technique. Data on the results of students' critical thinking skills are obtained from the value of the posttest or final test. Posttest is done by using test instruments in the form of descriptive tests as many as 6 items, each of which has a different critical thinking indicator. Previous test instruments were tested and analyzed to see the level of validity, reliability, differentiation and the level of difficulty of the questions. The results of the study showed that the average value of students' critical thinking ability achievement in the experimental class 1 was higher than that of the experimental class 2 students which were 74.09 and 70.22. Based on these results, the experimental class 1 which applied the problem solving learning model was better at improving students' thinking skills than the experimental class 2 which applied a problem-based learning model. Hypothesis testing with the T-test at the 0.05 significance level yields a sig value. (2-tailed)> level of signicant which is 0.147> 0.05 so that Ho is accepted. Thus, it can be concluded that there is no significant difference between the critical thinking skills of the experimental class 1 students who apply PS models and experimental class 2 students who apply the PBL model.
University of Bengkulu
2020-12-04
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13834
10.33369/atp.v4i2.13834
ALOTROP; Vol. 4 No. 2 (2020); 107-116
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13834/6833
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13835
2021-07-07T12:14:58Z
alotropjurnal:ART
PENGEMBANGAN METODE CITRA DIGITAL BERBASIS APLIKASI ANDROID UNTUK ANALISIS ION LOGAM Cr(VI)
Hitsmi, Marti
Firdaus, Mochamad Lutfi
Nurhamidah, Nurhamidah
The presence of heavy metals in the environment can be a serious problem because it is harmful to human health. One of the heavy metal ions that pollute the environment is the Cr6+ metal ion. The usual tool used to analyze metal ions is Cr6+ is the Atomic Absorption Spectrometry (AAS) and Inductively Couple Plasma (ICP) which are very expensive and require trained personnel. The purpose of this study was to design a simple detector for Cr6+ metal ions as an alternative to conventional methods using AAS and ICP. The detection tool was developed using the android-based digital image method with SLR data analysis techniques obtained from the reaction of the metal ion complex Cr6 + with the compound dhypenilcarbazida (DPC). The parameters of the tool measured were accuracy, selectivity and sensitivity with the reaction of DPC compounds as complexes. The comparison level of this method is the complex method with DPC using a UV-Vis spectrophotometer. This research was carried out in the Chemistry Laboratory FKIP UNIB in November 2018 until March 2019. The implementation of tool parameters was tested to samples of aquatic environments in Bengkulu City, namely PDAM Kota Bengkulu water, tap water of FKIP UNIB Dean, Lake UNIB water, Sungai Hitam water and water Pantai Panjang. The results showed that the detection of Cr6+ metal ions made by the android-based digital image method had better accuracy, selectivity and sensitivity than conventional methods. The DPC is selective for Cr6 + metal ions with a change in color from clear to violet, at a wavelength of 540 nm. Accuracy was checked using a UV-Vis spectrophotometer with 99% accurate results. After that, test sensitivity to Cr6 + metal ions. using the android application method generates a Limit of Detection (LOD) of 6.7 ppb. The detector that was developed was applied to water samples in the city of Bengkulu, it turned out that all of the water samples showed that the levels of Cr6+ metal ions were still below the threshold determined by the Minister of Health Regulation, so it was still safe to use in everyday life.
University of Bengkulu
2020-12-04
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13835
10.33369/atp.v4i2.13835
ALOTROP; Vol. 4 No. 2 (2020); 117-124
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13835/6834
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13862
2021-07-07T12:14:58Z
alotropjurnal:ART
PERBANDINGAN HASIL BELAJAR KIMIA SISWA ANTARA MODEL PEMBELAJARAN KOOPERATIF TIPE STAD DAN CORE DI SMAN 2 KOTA BENGKULU TAHUN PELAJARAN 2018/2019
Utari, Citra
Rohiat, Salastri
Nurhamidah, Nurhamidah
This study aims to see whether or not there are differences in student chemistry learning outcomes between classes that apply STAD and CORE type cooperative learning models to buffer solution material in class XI MIPA Bengkulu City 2 High School 2018/2019. The study was conducted in March-April 2019. This type of research is Quasi research experiments. The population of this study was students of class XI MIPA with a population of 243 students. Sampling was carried out after the homogeneity and normality test, so the class XI MIPA A and XI MIPA B was selected as the research sample with random sampling technique with a sample of 60 students. The first experimental class uses the STAD learning model and the experimental class II uses the CORE learning model. Student learning outcomes data obtained from the value of the pretest and posttest. The two treatments given can improve learning outcomes with the average value of the pretest of experimental class I and experiment II namely 27.83 and 33.83 then the average value of the posttest of experimental class I and experiment II is 80 and 80.2 which means the posttest value has reached KKM which is 75. Hypothesis testing is done using a significant level (? = 0.05), the value obtained for t count> t table is 2,286> 1,672. These results can be concluded that there are significant differences in learning outcomes between the experimental class I and experiment II on the buffer solution material
University of Bengkulu
2020-12-04
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13862
10.33369/atp.v4i2.13862
ALOTROP; Vol. 4 No. 2 (2020); 125-132
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13862/6837
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/13864
2021-07-07T12:14:58Z
alotropjurnal:ART
POTENSI EKSTRAK TUMBUHAN ANDALIMAN (Zanthoxylum acanthopodium DC.) SEBAGAI ANTIBAKTERI Staphylococcus aureus
Sepriani, Oma
Nirhamidah, Nurhamidah
Handayani, Dewi
The aims of this study is to determine the secondary metabolite compounds in Roots, stem bark, leaves and fruit of Andaliman (Zanthoxylum acanthopodium DC), and determine the most potent part of Andaliman plant extract in inhibiting the growth of Staphylococcus aureus bacteria. Andaliman plant taken in Simarpingan, Sipaholon village sub district of North Sumatra. Part of the Andaliman plantar are cleaned, cut into small pieces and then dried and mashed, samples that have been finely phytochemically tested and extracted. Testing of secondary metabolite compound by doing phytochemical screening of roots, stem bark, leaves and fruit of Andaliman, alkaloid test using meyers reagent, terpenoid test and steroid using TLC plate with eluent n-hexana : ethyl acetate with ratio 6:4, flavonoid test using soluton HCl and Mg band, saponin test using soap test, tannin test using ferro (III) chloride solution. Test of antibacterial activity using disc diffusion method. Phytochemical results showed that all parts of the plant andaliman contain secondary metabolite compounds namely alkaloids, flavonoids, terpenoids, tannins and also saponins. The result of antibacterial activity test of leaf extract of leaf and leaf which has the most potential as antibacterial of S.aureus is bark. Because it able to inhibit S.aureus growth with 11 mm inhibition zone at concentration 5x104 ppm, which is included in the strong category. In addition to skin of andaliman leaf stem is also potential as an antibacterial with a 10 mm inhibition zone at concentration 5x104 ppm, which is included in the medium category.
University of Bengkulu
2020-12-04
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/13864
10.33369/atp.v4i2.13864
ALOTROP; Vol. 4 No. 2 (2020); 133-139
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/13864/6838
Copyright (c) 2020 Alotrop
oai:ojs.localhost:article/16478
2021-06-28T17:55:57Z
alotropjurnal:ART
PERBANDINGAN MODEL PEMBELAJARAN KOOPERATIF TIPE TEAM ASSISTED INDIVIDUALIZATION (TAI) DAN THINK PAIR SHARE (TPS) TERHADAP MINAT DAN HASIL BELAJAR KIMIA SISWA
PERBANDINGAN MODEL PEMBELAJARAN KOOPERATIF TIPE TEAM ASSISTED INDIVIDUALIZATION (TAI) DAN THINK PAIR SHARE (TPS) TERHADAP MINAT DAN HASIL BELAJAR KIMIA SISWA
Napitupuluh, Elfrida
Elvia, Rina
Rohiat, Salastri
Minat Belajar
Hasil Belajar
Team Assisted Individualization
Think Pair Share
Penelitian ini bertujuan untuk menentukan perbedaan minat dan hasil belajar kimia siswa dengan menggunakan model pembelajaran Team Assisted Individualization dan model pembelajaran Think Pair Share pada materi persamaan reaksi kimia di SMAN 8 Kota Bengkulu Tahun Ajaran 2018/2019. Penelitian ini dilakukan pada bulan Februari - April 2019. Jenis penelitian ini adalah kuasi eksperimen. Populasi penelitian ini adalah siswa kelas X MIA dengan jumlah populasi 136 siswa. Pengambilan sampel dilakukan setelah uji homogenitas dan normalitas maka terpilih kelas X MIA 2 yang menerapkan model Team Assisted Individualization dan X MIA 3 yang menerapkan model Think Pair Share sebagai sampel penelitian dengan teknik purposive sampling dengan jumlah sampel 68 siswa. Analisis data yang digunakan adalah rata-rata (mean), uji normalitas, uji homogenitas,uji N-Gain Score dan uji hipotesis (uji t). Hasil penelitian secara umum menunjukkan bahwa penerapan model Team Assisted Individualization mampu memberikan hasil belajar yang lebih tinggi dari model Think Pair Share. Data hasil belajar kimia siswa diperoleh dari nilai pretest dan postest dengan selisih hasil belajar untuk kelas eksperimen I adalah 59,411 dan kelas eksperimen II adalah 57,647, berdasarkan nilai pretest dan postest didapatkan perolehan nilai N-Gain Score pada kelas eksperimen 1 besar 0,765 dan kelas eksperimen 2 sebesar 0,707. Sedangkan minat belajar kimia siswa pada kedua kelas memperoleh persentase sebesar 81,272% untuk model pembelajaran Team Assisted Individualization dan 76,647% untuk model pembelajaran Think Pair Share. Hasil uji t pada aspek kognitif didapatkan nilai sig.(2-tailed) sebesar 0,013 dan pada aspek afektif minat belajr sebesar 0,000. Hal tersebut menyatakan bahwa terdapat perbedaan yang signifikan pada minat dan hasil belajar kimia yang menerapkan model pembelajaran Team Assisted Individualization dan Think Pair Share
Penelitian ini bertujuan untuk menentukan perbedaan minat dan hasil belajar kimia siswa dengan menggunakan model pembelajaran Team Assisted Individualization dan model pembelajaran Think Pair Share pada materi persamaan reaksi kimia di SMAN 8 Kota Bengkulu Tahun Ajaran 2018/2019. Penelitian ini dilakukan pada bulan Februari - April 2019. Jenis penelitian ini adalah kuasi eksperimen. Populasi penelitian ini adalah siswa kelas X MIA dengan jumlah populasi 136 siswa. Pengambilan sampel dilakukan setelah uji homogenitas dan normalitas maka terpilih kelas X MIA 2 yang menerapkan model Team Assisted Individualization dan X MIA 3 yang menerapkan model Think Pair Share sebagai sampel penelitian dengan teknik purposive sampling dengan jumlah sampel 68 siswa. Analisis data yang digunakan adalah rata-rata (mean), uji normalitas, uji homogenitas,uji N-Gain Score dan uji hipotesis (uji t). Hasil penelitian secara umum menunjukkan bahwa penerapan model Team Assisted Individualization mampu memberikan hasil belajar yang lebih tinggi dari model Think Pair Share. Data hasil belajar kimia siswa diperoleh dari nilai pretest dan postest dengan selisih hasil belajar untuk kelas eksperimen I adalah 59,411 dan kelas eksperimen II adalah 57,647, berdasarkan nilai pretest dan postest didapatkan perolehan nilai N-Gain Score pada kelas eksperimen 1 besar 0,765 dan kelas eksperimen 2 sebesar 0,707. Sedangkan minat belajar kimia siswa pada kedua kelas memperoleh persentase sebesar 81,272% untuk model pembelajaran Team Assisted Individualization dan 76,647% untuk model pembelajaran Think Pair Share. Hasil uji t pada aspek kognitif didapatkan nilai sig.(2-tailed) sebesar 0,013 dan pada aspek afektif minat belajr sebesar 0,000. Hal tersebut menyatakan bahwa terdapat perbedaan yang signifikan pada minat dan hasil belajar kimia yang menerapkan model pembelajaran Team Assisted Individualization dan Think Pair Share
University of Bengkulu
2021-06-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/16478
10.33369/atp.v5i1.16478
ALOTROP; Vol. 5 No. 1 (2021); 1-10
2615-2819
eng
https://ejournal.unib.ac.id/alotropjurnal/article/view/16478/7949
Copyright (c) 2021 Elfrida Napitupuluh, Rina Elvia, Salastri Rohiat
oai:ojs.localhost:article/16479
2021-06-28T17:55:57Z
alotropjurnal:ART
STUDI PERBANDINGAN MODEL PEMBELAJARAN LEARNING CYCLE 5E DAN GUIDED DISCOVERY LEARNING MENGGUNAKAN MEDIA VIDEO PEMBELAJARAN TERHADAP HASIL BELAJAR KIMIA SISWA
Kartini, Putri
Bahar, Amrul
Elvinawati, Elvinawati
Learning Cycle 5E
Guided Discovery Learning
Video Pembelajaran
Hasil Belajar
Penelitian ini bertujuan untuk melihat perbedaan hasil belajar kimia siswa yang menerapkan model pembelajaran Learning Cycle 5E dengan Guided Discovery Learning menggunakan media video pembelajaran pada materi kesetimbangan ion dalam larutan garam di kelas XI MIA SMAN 08 Kota Bengkulu. Penelitian dilakukan pada bulan Februari – Juli 2019 tahun pelajaran 2018/2019. Jenis penelitian ini adalah Quasi eksperimen research. Populasi penelitian ini adalah seluruh siswa kelas XI MIA yang berjumlah 136 siswa. Pengambilan sampel dilakukan setelah uji normalitas dan homogenitas.Setelah diuji normalitas dan homogenitasnya, maka sampel ditentukan dengan teknik random sampling sebanyak dua kelas. Kelas eksperimen 1 yaitu kelas XI MIA 3 yang berjumlah 34 siswa menerapkan model pembelajaran Learning Cycle 5E sedangkan kelas eksperimen 2 yaitu kelas XI MIA 4 yang berjumlah 35 siswa menerapkan model pembelajaran Guided Discovery Learning.Data hasil belajar siswa diperoleh dari nilai pre-test dan post-test dan data diolah menggunakan uji normalitas, uji homogenitas dan uji hipotesis dengan taraf signifikan 0,05. Hasil penelitian secara umum, kedua model pembelajaran yang diterapkanterbukti dapat meningkatkan hasil belajar siswa dan sudah mencapai standar nilai KKM yaitu 75. Kelas yang menerapkan model pembelajaran Learning Cycle 5E mendapatkan hasil belajar yang lebih tinggi dibandingkan kelas yang menerapkan model pembelajaran Guided Discovery Learning. Nilai rata-rata post-test kelas eksperimen 1 dan eksperimen 2 yaitu 82,35 dan 77,14 yang berarti nilai post-test telah mencapai standar nilai KKM, kemudian nilai selisih rata-rata pre-test dan post-test kelas eksperimen 1 dan eksperimen 2 yaitu 57,06 dan 52,57. Berdasarkan selisih nilai rata-rata pre-test dan post-test kelas eksperimen 1 lebih tinggi dibandingkan kelas eksperimen 2. Pengujian hipotesis didapatkan nilai signifikansi > 0.05 yaitu 0.214. Hasil uji hipotesis disimpulkan bahwa tidak terdapat perbedaan yang signifikan antara kelas yang menerapkan model pembelajaran Learning Cycle 5E dengan kelas yang menerapkan model pembelajaran Guided Discovery Learningmenggunakan media video pembelajaran.
University of Bengkulu
2021-06-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/16479
10.33369/atp.v5i1.16479
ALOTROP; Vol. 5 No. 1 (2021); 11-18
2615-2819
ind
https://ejournal.unib.ac.id/alotropjurnal/article/view/16479/7950
Copyright (c) 2021 Putri Kartini, Amrul Bahar, Elvinawati Elvinawati
oai:ojs.localhost:article/16482
2021-06-28T17:55:57Z
alotropjurnal:ART
PERBANDINGAN PEMBELAJARAN KOPERASI TIPE TWO STAY TWO STRAY (TSTS) DAN GROUP INVESTIGATION (GI) TERHADAP HASIL BELAJAR KIMIA
Krisma, Apria Haja
Handayani, Dewi
Nurhamidah, Nurhamidah
Hasil belajar
Two stay two stray
Group investigation
Penelitian ini bertujuan untuk menentukan perbedaan hasil belajar antara kelas yang menerapkan model pembelajaran Two stay two stray dengan kelas yang menerapkan model Group investigation pada materii perkembangan teori atom di kelas X IPA SMA Negeri 9 kota Bengkulu. Penelitian yang dilakukan merupakan penelitian dengan jenis eksperimen semu.Analisis data yang digunakan adalah rata-rata (mean), uji normalitas, uji homogenitas, dan uji hipotesis (uji U). Populasi pada penelitian ini yaitu seluruh kelas X IPA sebanyak tiga kelas. Sampel pada penelitian ini sebanyak dua kelas, yaitu kelas X IPA 2 sebagai kelas eksperimen I dan kelas X IPA 3 sebagai kelas eksperimen II.Data hasil belajar kimia siswa diperoleh dari nilai pretes dan postes. Hasil dari nilai rata-rata pretes dan postes sebesar 33,751 dan 74,643 untuk kelas exsperimen I sedangkan pada kelas exsperimen II nilai pretest dan postest sebesar 30,385 dan 72,308 dengan rata-rata nilai selisih untuk kelas two stay two stray dan group investigation adalah sebesar 41,072 dan 41,923. Data tersebut menyimpulkan bahwa kelas eksperimen II lebih efektif dalam meningkatkan hasil belajar siswa dibandingkan pada kelas eksperimen II meskipun nilai rata-rata yang diperoleh dari kedua kelas masih dibawah setandar KKM.Berdasarkan hasil uji Hipotesis (uji U) dengan taraf signifikansi < 0,05 didapatkan nilai signifikansi hitunga sebesar 0,466. Hal ini menunjukkan bahwa tidak terdapat perbedaan yang signifikan antara model pembelajaran two stay two stray dengan model pembelajaran group investigation.
University of Bengkulu
2021-06-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/16482
10.33369/atp.v5i1.16482
ALOTROP; Vol. 5 No. 1 (2021); 19-26
2615-2819
ind
https://ejournal.unib.ac.id/alotropjurnal/article/view/16482/7951
Copyright (c) 2021 Apria Haja Krisma, Dewi Handayani, Nurhamidah Nurhamidah
oai:ojs.localhost:article/16483
2021-06-28T17:55:57Z
alotropjurnal:ART
STUDI PERBANDINGAN HASIL BELAJAR KIMIA SISWA MENGGUNAKAN MODEL PEMBELAJARAN PROBLEM BASED LEARNING (PBL) DAN DISCOVERY LEARNING PADA MATERI LARUTAN PENYANGGA
Anjelina, Rina
Elvinawati, Elvinawati
Nurhamidah, Nurhamidah
Hasil belajar
Problem Based Learning (PBL)
Discovery Learning
Tujuan dari penelitian ini untuk mengetahui perbandingan hasil belajar kimia siswa menggunakan model pembelajaran Problem Based Learning (PBL) dan Discovery Learning pada materi larutan penyangga. Penelitian ini dilakukan pada bulan Januari - April 2019. Penelitian yang dilakukan merupakan jenis penelitian eksperimen semu. Populasi penelitian ini adalah kelas XI IPA yang berjumlah 70 siswa di SMAN 2 Bengkulu Utara tahun ajaran 2018/2019. Pengambilan sampel dilakukan setelah uji homogenitas dan normalitas maka terpilih kelas XI IPA 1 yang menggunakan model Discovery Learning dan XI IPA 3 yang menggunakan model Problem Based Learning (PBL) dengan jumlah 47 siswa. Analisis data yang digunakan adalah rata-rata (mean), N-Gain Score, uji normalitas, uji homogenitas, dan uji hipotesis (uji t). Hasil penelitian secara umum menunjukkan bahwa penerapan model Discovery Learning mampu memberikan hasil belajar yang lebih tinggi dibandingkan model Problem Based Learning (PBL) di SMAN 2 Bengkulu Utara tahun ajaran 2018/2019. Nilai rata-rata pretest-posttest pada kelas Problem Based Learning (PBL) sebesar 45 dan pada kelas Discovery Learning sebesar 53,91. Hasil uji t pada aspek kognitif didapatkan nilai sig. (0,042). Hal tersebut menyatakan bahwa terdapat perbedaan yang signifikan pada hasil belajar siswa yang menerapkan model Problem Based Learning (PBL) dan Discovery Learning.
University of Bengkulu
2021-06-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/16483
10.33369/atp.v5i1.16483
ALOTROP; Vol. 5 No. 1 (2021); 27-34
2615-2819
ind
https://ejournal.unib.ac.id/alotropjurnal/article/view/16483/7952
Copyright (c) 2021 Rina Anjelina, Elvinawati Elvinawati, Nurhamidah Nurhamidah
oai:ojs.localhost:article/16484
2021-06-28T17:55:57Z
alotropjurnal:ART
ANALISIS KEMAMPUAN BERPIKIR KRITIS SISWA PADA MATERI REAKSI REDUKSI OKSIDASI (REDOKS) DI MAN 1 KOTA BENGKULU
Andraini, Maya Riski
Rohiat, Salastri
Elvia, Rina
Kemampuan Berpikir Kritis
Materi Reaksi Reduksi Oksidasi
Indikator Facione
Penelitian ini bertujuan untuk mengetahui dan mengindentifikasi kemampuan berpikir kritis siswa pada materi reaksi reduksi oksidasi (redoks) di MAN 1 Kota Bengkulu berdasarkan indikator dari facione yang dilakukan pada bulan Maret – Agustus 2020. Populasi penelitian ini adalah seluruh siswa kelas XI MIPA MAN 1 Kota Bengkulu berjumlah 220 siswa. Sampel penelitian sebanyak 112 siswa. Jenis penelitian adalah deskriptif kuantitatif. Instrumen penelitian yang digunakan adalah instrumen tes berupa soal uraian, rubrik penilaian dan pedoman penskoran serta instumen non tes berupa lembar validasi ahli. Hasil penelitian menunjukkan bahwa kemampuan berpikir kritis siswa di kelas XI MIPA MAN 1 Kota Bengkulu pada materi reaksi reduksi oksidasi yaitu memiliki kemampuan sangat kritis dengan persentase 4%, memiliki kemampuan kritis dengan persentase 22%, memiliki kemampuan cukup kritis dengan persentase 18%, memiliki kemampuan kurang kritis dengan persentase 47% dan memiliki kemampuan tidak kritis dengan persentase 9%. Skor rata-rata kemampuan berpikir kritis siswa sebesar 56,14 yang berada pada kategori cukup kritis. Untuk hasil persentase berdasarkan tiap indikator dari facione yaitu, indikator interpretasi sebesar 40% termasuk dalam kategori kurang kritis, indikator inferensi sebesar 67% termasuk dalam kategori kritis, indikator eksplansi sebesar 63% termasuk dalam kategori cukup kritis, indikator self regulation sebesar 70% termasuk dalam kategori kritis, indikator analisis sebesar 56% termasuk dalam kategori cukup kritis, indikator evaluasi sebesar 40% termasuk dalam kategori kurang kritis.
University of Bengkulu
2021-06-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/16484
10.33369/atp.v5i1.16484
ALOTROP; Vol. 5 No. 1 (2021); 35-41
2615-2819
ind
https://ejournal.unib.ac.id/alotropjurnal/article/view/16484/7953
Copyright (c) 2021 Maya Riski Andraini, Salastri Rohiat, Rina Elvia
oai:ojs.localhost:article/16485
2021-06-29T12:36:13Z
alotropjurnal:ART
KARAKTERISASI ADSORBEN KARBON AKTIF DARI SABUT PINANG (Areca catechu ) TERHADAP KAPASITAS ADSORPSI ZAT WARNA INDIGOSOL BLUE 04-B
Fitriansyah, Ahmad
Amir, Hermansyah
Elvinawati, Elvinawati
Adsorpsi
arang aktif
sabut pinang
Indigosol Blue 04-B
Penelitian ini bertujuan untuk mengkarakterisasi arang aktif yang dibuat dari sabut pinang ( Areca catechu) dan untuk menentukan bagaimana pengaruh pH, waktu kontak, berat adsorben dan suhu pada proses adsorpsi zat warna Indigosol Blue 04-B serta menentukan kapasitas adsorpsinya. Pembuatan arang aktif dilakukan dengan cara karbonasi dan aktivasi. Aktivator yang digunakan yaitu H3PO4 10% dengan waktu perendaman selama 24 jam dan suhu aktivasi 1500C selama 30 menit. Karakterisasi dilakukan dengan menggunakan Spektrofotometri UV-Vis dan Brunauer-Emmet-Teller (BET). Panjang gelombang optimum larutan zat warna Indigosol Blue 04-B yang diperoleh dari karakterisasi dengan menggunakan spektrofotometer UV- Vis sebesar 580 nm. Luas permukaan yang dihasilkan oleh arang aktif sabut pinang yaitu 41,101 m2/g. Jenis isoterm yang diuji yaitu isoterm Langmuir dan Freundlich. Kondisi optimum adsorpsi pada zat warna Indigosol Blue 04-B yaitu pada pH 7, waktu kontak 40 menit, berat adsorben 50 mg dan pada suhu 25 0C. Kapasitas adsorpsi arang aktif sabut pinang terhadap zat warna Indigosol Blue 04-B dengan menggunakan isoterm Freundlich adalah sebesar 19,8 mg/g.
University of Bengkulu
2021-06-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/16485
10.33369/atp.v5i1.16485
ALOTROP; Vol. 5 No. 1 (2021); 42-54
2615-2819
ind
https://ejournal.unib.ac.id/alotropjurnal/article/view/16485/7954
Copyright (c) 2021 Ahmad Fitriansyah, Hermansyah Amir
oai:ojs.localhost:article/16487
2021-06-28T17:55:57Z
alotropjurnal:ART
ANALISIS MISKONSEPSI SISWA MENGGUNAKAN TES DIAGNOSTIK ESAI BERBANTUAN CRI (CERTAINTY OF RESPONSE INDEX) PADA POKOK BAHASAN ASAM BASA
Izza, Raudha Isminiarti
Nurhamidah, Nurhamidah
Elvinawati, Elvinawati
Miskonsepsi
Penyebab Miskonsepsi
Certainty of Response Index (CRI)
Asam Basa.
Penelitian ini bertujuan untuk mengidentifikasi miskonsepsi dan penyebab miskonsepsi siswa kelas XI MIPA pada konsep asam basa di SMAN 6 Kota Bengkulu Tahun Pelajaran 2019/2020. Metode yang digunakan dalam penelitian ini adalah deskriptif kuantitatif. Populasi dalam penelitian ini adalah seluruh siswa kelas XI MIPA SMAN 6 Kota Bengkulu dengan jumlah sampel sebanyak 50 siswa. Instrumen yang digunakan adalah instrumen tes diagnostik berupa soal esai yang disertai dengan metode Certainty of Response Index (CRI), angket serta wawancara diagnosis. Hasil Penelitian menunjukkan miskonsepsi siswa pada materi asam basa dengan persentase miskonsepsi secara keseluruhan sebesar 25,38% . Miskonsepsi tertinggi terjadi pada sub konsep menetukan derajat keasaman yaitu sebesar 36,6% dan miskonsepsi terendah terjadi pada sub konsep menganalisis persamaan reaksi asam basa bronsted lowry yaitu sebesar 13,3%. Berdasarkan hasil angket dan wawancara, penyebab miskonsepsi siswa berasal dari faktor internal dan eksternal. Faktor internal berasal dari siswa seperti pemikiran assosiatif siswa, apresiasi dan intuisi siswa yang salah, kemampuan siswa yang kurang, rendahnya motivasi dan minat belajar siswa selama proses pembelajaran, cara belajar siswa, dan tingkat kepercayaan diri siswa pada nilai CRI dan faktor eksternal seperti metode pembelajaran yang digunakan dan keterbatasan sumber belajar.
University of Bengkulu
2021-06-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/16487
10.33369/atp.v5i1.16487
ALOTROP; Vol. 5 No. 1 (2021); 55-63
2615-2819
ind
https://ejournal.unib.ac.id/alotropjurnal/article/view/16487/7955
Copyright (c) 2021 Raudha Isminiarti Izza, Nurhamidah Nurhamidah, Elvinawati Elvinawati
oai:ojs.localhost:article/16488
2021-06-28T17:55:57Z
alotropjurnal:ART
PENGARUH PEMANFAATAN MEDIA PRESENTASI ONLINE PREZI PADA MATERI KONSEP MOL TERHADAP HASIL BELAJAR SISWA (Studi Eksperimen di Kelas X MIPA SMAN 9 Bengkulu Utara)
PENGARUH PEMANFAATAN MEDIA PRESENTASI ONLINE PREZI PADA MATERI KONSEP MOL TERHADAP HASIL BELAJAR SISWA (Studi Eksperimen di Kelas X MIPA SMAN 9 Bengkulu Utara)
Ikram, Ahmad Fadli Zil
Elvia, Rina
Handayani, Dewi
Hasil belajar
respon siswa
media online
presentasi Prezi
pendekatan saintifik.
Hasil belajar
respon siswa
media online
presentasi Prezi
pendekatan saintifik.
Penelitian ini bertujuan mengetahui pengaruh pemanfaatan media presentasi online Prezi pada materi konsep mol terhadap hasil belajar siswa Kelas X MIPA SMA N 9 Bengkulu Utara Tahun Ajaran 2018/2019. Jenis penelitian ini adalah kuasi eksperimen. Data berupa N-Gain Score, lembar observasi guru, angket respon siswa. Analisis data menggunakan rata-rata, uji normalitas, uji homogenitas, dan uji hipotesis (uji t). Data hasil belajar siswa diperoleh dari nilai pretest dan posttest dengan rata-rata 34,636 dan 71,545 untuk kelas eksperimen sedangkan pada kelas kontrol 27,407 dan 61,407. Pemanfaatan media online Prezi mendapat nilai N-Gain Score sebesar 0,587 diperoleh dari rata-rata pretest dan posttest. Hasil observasi guru kimia pembelajaran berlangsung dengan baik dengan skor total 20. Respon siswa dari angket berisi 10 pernyataan sangat positif dengan persentase 81,93%. Berdasarkan hasil uji hipotesis (Uji t) dengan taraf signifikansi < 0,05 didapat nilai 0,000423. Hal ini menunjukkan bahwa pembelajaran kimia yang menggunakan media presentasi online Prezi dengan pendekatan saintifik lebih baik daripada pembelajaran konvensional.
Penelitian ini bertujuan mengetahui pengaruh pemanfaatan media presentasi online Prezi pada materi konsep mol terhadap hasil belajar siswa Kelas X MIPA SMA N 9 Bengkulu Utara Tahun Ajaran 2018/2019. Jenis penelitian ini adalah kuasi eksperimen. Data berupa N-Gain Score, lembar observasi guru, angket respon siswa. Analisis data menggunakan rata-rata, uji normalitas, uji homogenitas, dan uji hipotesis (uji t). Data hasil belajar siswa diperoleh dari nilai pretest dan posttest dengan rata-rata 34,636 dan 71,545 untuk kelas eksperimen sedangkan pada kelas kontrol 27,407 dan 61,407. Pemanfaatan media online Prezi mendapat nilai N-Gain Score sebesar 0,587 diperoleh dari rata-rata pretest dan posttest. Hasil observasi guru kimia pembelajaran berlangsung dengan baik dengan skor total 20. Respon siswa dari angket berisi 10 pernyataan sangat positif dengan persentase 81,93%. Berdasarkan hasil uji hipotesis (Uji t) dengan taraf signifikansi < 0,05 didapat nilai 0,000423. Hal ini menunjukkan bahwa pembelajaran kimia yang menggunakan media presentasi online Prezi dengan pendekatan saintifik lebih baik daripada pembelajaran konvensional.
University of Bengkulu
2021-06-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
application/pdf
https://ejournal.unib.ac.id/alotropjurnal/article/view/16488
10.33369/atp.v5i1.16488
ALOTROP; Vol. 5 No. 1 (2021); 64-73
2615-2819
eng
ind
https://ejournal.unib.ac.id/alotropjurnal/article/view/16488/7956
https://ejournal.unib.ac.id/alotropjurnal/article/view/16488/7957
Copyright (c) 2021 Ahmad Fadli Zil Ikram, Rina Elvia, Dewi Handayani
5add91f541d8ad6c3664bf9ebb46f354