Garuda - Garba Rujukan Digital

STUDI KOMPONEN KIMIA PELEPAH SAWIT VARIETAS TENERA DAN PENGEMBANGANNYA SEBAGAI MODUL PEMBELAJARAN KIMIA Arpinaini Arpinaini; Sumpono Sumpono; Ridwan Yahya
PendIPA Journal of Science Education Vol 1, No 1 (2017): october
Publisher : University of Bengkulu

This study aims to (1) determine the levels of the components of the Tenera variety of palm oil compounds including extractives, holocellulose, ? - cellulose, and lignin. (2) Analyze the utilization of the pulp of Tenera varieties as pulp raw materials based on their chemical components; (3) application of chemistry learning module to improving student learning outcomes. Determination of extractive substance content with TAPPI test methods Q: 204; lignin content T: 222; holocellulose Q: 9 levels and ?-cellulose content with TAPPI test methods T: 204. then lignin, holocellulose and ?-cellulose produced from the procedure were characterized by an IR spectrophotometer. The results of the study were module and implemented in ICHO students in SMAN 2 Kota Bengkulu. The data of the research results were analyzed by ANOVA test at 5% level. The results of the characterization of lignin, holocellulose and ?-cellulose with FTIR obtained a distinctive peak of the respective functional groups of the macromolecules. From the research also obtained the average value of chemical component content on the palm velvet varieties of tenera according to their part of base, middle, ends with mean for extractive substance 8.49%, 7,87%, 6,74%, lignin 20,7 %, 18.95%, 16.69%. holocellulose 81.57%, 80.33%, 79.24% and ?- cellulose 44.57%, 43.56%, 43.26%. Based on the results of the variance analysis, the difference in position (base, center, tip) on the palm oil of the tenera varieties on extractive, lignin, holocellulose and ?-cellulose substances has significant differences. Based on the chemical component classification of Indonesian wide wood leaf, sheep betera varieties of tenera in all three positions are used as pulp raw materials because they have moderate lignin content, high levels of Holocellulose and moderate levels of ?-cellulose. The result of module implementation in students there is a significant difference between pretest and posttest value. The use of modules in learning in science groups can improve student learning outcomes.

PENJERAPAN ZAT WARNA SINTETIS MENGGUNAKAN KARBON AKTIF KELAPA SAWIT DAN PENGEMBANGANNYA SEBAGAI BAHAN AJAR Efa Susanti; M.Lutfi Firdaus; Sumpono Sumpono
PendIPA Journal of Science Education Vol 1, No 1 (2017): october
Publisher : University of Bengkulu

This study aims to: (1) explain the ability of the active carbon absorption of Palm Oil Palm as a dye adsorbent Reactive Red and Direct Green (2) determines the pH, contact time, and weight of the optimum adsorbent and the influence of temperature using activated carbon. Reactive Red and Direct Green dyestuffs. (3) to explain the influence of video media usage on the improvement of learning result and critical thinking ability of students in Chemistry class XI MIPA E at SMAN 2 Kota Bengkulu. The procedure in this study is the activation of activated carbon of palm oil and activated, activated carbon characterization using FTIR, Determination of maximum wavelength (?), Calibration curve creation, Adsorption of substance by activated carbon of palm oil: determining pH, contact time, adsorbent weight, , adsorption isotherms, Determination of temperature effect, Adsorption Isotherm Determination, Determination of adsorption kinetics, Applications on dyestuffs. The data were analyzed. The result of pH variation, variation of adsorbent weight, and contact time were made curve so that pH, adsorbent weight, concentration and optimum contact time were obtained using Excel program. Using ANAVA one way, followed by KR-20 test and one sample t test. The results showed that there were: reactive red optimum wavelength 496 nm, optimum pH 3, optimum time 40 min, absorbent weight 150 mg, maximum absorbency KAPKS 32,73 mg / gr and direct green optimum wavelength 613 nm, with optimum pH 5, optimum time 40 minutes, absorbent weight 150 mg, maximum absorbency KAPKS 32.825 mg / gr. there is an increase of chemistry learning outcomes during the enrichment hours or outside of class hours and critical thinking skills of grade XI IPA E SMAN2 Kota Bengkulu using audio-visual media with average pretest score of 75 and average post test score 82.27 with four criteria critical thinking skills are less critical by 26%, critical enough 43%, critical 23% and very critical at 8%.

UJI EFEKTIFITAS ASAP CAIR CANGKANG BUAH KARET (Hevea braziliensis) SEBAGAI ANTIBAKTERI Bacillus subtilis Lia Retno Sari; Sumpono Sumpono; Elvinawati Elvinawati
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9033

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.

AKTIVITAS ANTIOKSIDAN METABOLIT SEKUNDER BAKTERI ENDOFIT AKAR TANAMAN Moringa oleifera L (Kelor) Zeta Kuntari; Sumpono Sumpono; Nurhamidah Nurhamidah
ALOTROP Vol 1, No 2 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i2.3483

[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).

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 Windy Novita Amalia; Hermansyah Amir; Sumpono Sumpono
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9026

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.

POTENSI AKTIVITAS ANTIOKSIDAN METABOLIT SEKUNDER DARI BAKTERI ENDOFIT PADA DAUN Moringa oleifera L Susi Juni Yati; Sumpono Sumpono; I Nyoman Candra
ALOTROP Vol 2, No 1 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i1.4744

[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.

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 Evi Elyani; Sumpono Sumpono; Hermansyah Amir
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9046

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.

Studi Komparasi Motivasi Belajar Kimia Siswa Kelas X Program Peminatan dan Lintas Minat di MAN 2 Kota Bengkulu Elinge Haster; Salastri Rohiat; Sumpono Sumpono
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9039

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.

MENGGUNAKAN MEDIA INTERNET DOCS.GOOGLE PADA POKOK BAHASAN REAKSI REDOKS KELAS X IPA DI SMAN 4 KOTA BENGKULU Aang Parade; Dewi Handayani; Sumpono Sumpono
ALOTROP Vol 2, No 1 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i1.4582

[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.

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 Rika Juwita Saputri; Sumpono Sumpono; Rina Elvia
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7489

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.

Title

Found 13 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 13 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 13 Documents
Search