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All Journal Jurnal Ilmu dan Teknologi Kayu Tropis YASIN: Jurnal Pendidikan dan Sosial Budaya
Annisa Alfira
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Agriculture, Biological Sciences & Forestry Social Sciences Other

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Aktivitas Antioksidan Ekstrak Kulit Wuru (Antioxidant activity of Wuru Bark Extractives) Arief H Prianto; Annisa Alfira; Eka Putri
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 14, No 2 (2016): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/jitkt.v14i2.212

Abstract

Wuru (Cinnamomum cinereum Gamble) has many compounds which are potential as medicine. It’s spread out in Java, Sumatera and Kalimantan. Research of antioxidant activity of wuru barks is still limited. The objective of this study was to evaluate the antioxidant activity of wuru bark extract and its chemical composition. The barks were extracted using n-hexane, ethyl acetate and methanol. Antioxidant capacity was determined by 1,1-diphenyl-2-pikril-hidrazil (DPPH). Vitamin C was used as a comparison. Three fraction of methanol extract showed very high antioxidant activity. They have IC50 value 6.2, 7.89, and 13.3 ppm, respectively.
Pengaruh Model Pembelajaran Problem Base Learning terhadap Kemampuan Berfikir Kritis Siswa pada Pembelajaran Biologi Annisa Alfira; Rahmadhani Fitri
YASIN Vol 3 No 4 (2023): YASIN: Jurnal Pendidikan dan Sosial Budaya
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/yasin.v3i4.1529

Abstract

Facing the demands of technological developments, there are 4 competencies that must be possessed by students, one of which is the ability to think critically. This study aims to see the influence of the Problem Based Learning learning model from previous research research that has been published so that comparison results related to Problem Base Learning learning outcomes are obtained on students' critical thinking skills at the Senior High School (SMA) level in biology subjects. The method used in this study is a literature study of 5 articles published to Google Schoolar, Mendeley and other scientific publications. The findings of this study show that the Project Base Learning learning model has a positive
Co-Authors Arief H Prianto Eka Putri Rahmadhani Fitri