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All Journal Journal of Agriculture and Applied Biology Journal of Agriculture and Applied Biology ( JAAB) Journal of Mathematical Pedagogy (JOMP)
Saputri, Dina
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Mathematics Social Sciences Other

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The Impact of Mathematical Learning based on Sorogan Methods Assisted by Peer Tutors against Students' Mathematical-Concepts Understanding Saputri, Dina; Budiman, Haris; Putra, Rizki Wahyu Yunian
Journal of Mathematical Pedagogy (JoMP) Vol. 1 No. 1: December 2019
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jomp.v1n1.p9-17

Abstract

This study aims to determine the effect of learning with Sorogan Methods on students' mathematical-concept understanding, knowing the effect of peer tutors on students' mathematical-concept understanding and find out the increase between sorogan methods assisted peer tutor and students' mathematical-concept understanding. The method used in this study was the Quasy Experiment method, this study used a one way variance analysis (ANAVA) technique with unequal cells. The results showed that there was an influence of the Sorogan Method on students' mathematical-concept understanding, where the Sorogan Method was better than the conventional learning model. There was an influence of the Peer Tutor Method on students 'understanding of mathematical concepts, where the Peer Tutor Method was better than the Conventional Learning Model. There was an increase in the Sorogan method of peer tutor assistance on students' mathematical-concept understanding. This study shows that the Peer Tutor Assisted Sorogan method has a good effect on students' mathematical-concept understanding.Keywords: the sorogan method, students mathematical-concept understanding, peer tutors.
Antioxidant Activity of Endophytic Bacterial Extract Isolated from Clove Leaf (Syzygium aromaticum L.) Sogandi, Sogandi; Triandriani, Widya; Saputri, Dina; Suhendar, Usep
Journal of Agriculture and Applied Biology Vol 1 No 1 (2020): Journal of Agriculture and Applied Biology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (344.084 KB) | DOI: 10.11594/jaab.01.01.02

Abstract

Clove (Syzygium aromaticum L.) is one type of spice plant that has high antioxidant content because of the high eugenol compounds. However, iso-lating these bioactive compounds require a significant amount of biomass. A known alternative solution to overcome the problems is through the utiliza-tion of endophytic bacteria in clove leaves. Endophytic cloves leaf bacteria can be a good antioxidant resource. Endophytic bacteria are bacteria that grow in plant tissues that is not pathogenic, which can replace these plants. The aim of this study is isolating endophytic bacterial from clove leaves, screening endophytic bacteria, determining potential endophytic bacteria as producer antioxidant compounds, and identifying potential isolate using 16S rRNA. This study used endophytic bacteria isolated from clove leaves (Syzygium aromaticum L.). Antioxidant activity determined using DPPH method. It was founded 7 isolates of endophytic bacteria namely WDY1, WDY2, WDY3, WDY4, WDY5, WDY6, and WDY7. The isolate WDY6 shows the highest antioxidant activity. WDY6 isolate is identical to Staphylococcus sp. with a 100% similarity. Staphylococcus sp. has the highest antioxidant activ-ity in the stationary phase. The content of chemical compounds from WDY6 isolates is pyrazine that belongs to alkaloids.
Antioxidant Activity of Endophytic Bacterial Extract Isolated from Clove Leaf (Syzygium aromaticum L.) Sogandi, Sogandi; Triandriani, Widya; Saputri, Dina; Suhendar, Usep
Journal of Agriculture and Applied Biology Vol 1 No 1 (2020): Journal of Agriculture and Applied Biology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jaab.01.01.02

Abstract

Clove (Syzygium aromaticum L.) is one type of spice plant that has high antioxidant content because of the high eugenol compounds. However, iso-lating these bioactive compounds require a significant amount of biomass. A known alternative solution to overcome the problems is through the utiliza-tion of endophytic bacteria in clove leaves. Endophytic cloves leaf bacteria can be a good antioxidant resource. Endophytic bacteria are bacteria that grow in plant tissues that is not pathogenic, which can replace these plants. The aim of this study is isolating endophytic bacterial from clove leaves, screening endophytic bacteria, determining potential endophytic bacteria as producer antioxidant compounds, and identifying potential isolate using 16S rRNA. This study used endophytic bacteria isolated from clove leaves (Syzygium aromaticum L.). Antioxidant activity determined using DPPH method. It was founded 7 isolates of endophytic bacteria namely WDY1, WDY2, WDY3, WDY4, WDY5, WDY6, and WDY7. The isolate WDY6 shows the highest antioxidant activity. WDY6 isolate is identical to Staphylococcus sp. with a 100% similarity. Staphylococcus sp. has the highest antioxidant activ-ity in the stationary phase. The content of chemical compounds from WDY6 isolates is pyrazine that belongs to alkaloids.
Co-Authors Gios Adhyaksa Rizki Wahyu Yunian Putra Sogandi, Sogandi Triandriani, Widya usep suhendar