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All Journal Alotrop Jurnal Pendidikan dan Ilmu Kimia
Elvinawati Elvinawati
University of Bengkulu
Chemistry Education

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PERBANDINGAN HASIL BELAJAR SISWA MENGGUNAKAN MEDIA CHEMOPOLY GAME DAN TOURNAMENT QUESTION CARDS Dui Sherly Viani; Amrul Bahar; Elvinawati Elvinawati
ALOTROP Vol 1, No 1 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i1.2718

Abstract

The low learning outcomes of the students is because in the learning process of teacher and student interaction only goes one way. Teachers often use lecture methods so that students tend to only accept what is given. This can make the students' motivation and activeness in following the lesson to be low. Therefore, researchers try to vary the cooperative learning model using Chemopoly Game media and Tournament Question Cards. This is quasi experimental research with population class X MIPA in SMAN 2 Kota Bengkulu and sample is class X MIPA C using media Tournament Question Cards and class X MIPA D using Chemopoly Game media. Data analysis used were mean score, normality test, homogeneity test, and t test. The average posttest grade of experiment I is 85,59 While for experiment class II is 79,38. Then t test and obtained tcount> ttable (2.62> 2.38). The results of this study indicate that there is a significant difference between student learning outcomes using Chemopoly Game media and Tournament Question Cards on basic chemical law materials.
AKTIVITAS ANTIOKSIDAN DAN ANTIBAKTERI EKSTRAK DAUN Jatropha gossypifolia L Nia Sapitri Pangestu; Nurhamidah Nurhamidah; Elvinawati Elvinawati
ALOTROP Vol 1, No 1 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i1.2707

Abstract

This study was conducted to determine the activity of Jatropha gossypifolia L (jarak merah’s) leaf extract as an antioxidant and antibactery against acne causing bacteria (Propionibacterium acnes). To obtain an J. gossypifolia L jarak merah’s leaf extract by maceration using 96% ethanol, and then fractionated with n-hexane and ethyl acetate. Testing of antioxidant activity by DPPH method and antibactery activity test by the paper disc method. Antioxidant activity test has done for ethanol fraction, ethyl acetate fraction and n-hexane fraction, while testing for antibacterial activity performed on fractions active as antioxidant. The test results demonstrate the antioxidant activity of ethyl acetate fraction and the ethanol fraction as a fraction very strong with IC50 value of 22.33 ppm for ethyl acetate fraction and 41.04 ppm for ethanol fraction. Then the fraction of ethyl acetate and ethanol fraction antibactery activity test, the result is known that both factions have the ability to inhibit the growth of bacteria Propionibacterium acnes demonstrated by the inhibition zone is formed. In 1000 ppm is formed diameter of the greatest inhibition zone that is equal to 6 mm for ethyl acetate fraction and 5 mm for ethanol fraction.
Co-Authors Amrul Bahar Dui Sherly Viani Nia Sapitri Pangestu Nurhamidah Nurhamidah