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Minarni Rama Jura
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Journal : Media Eksakta

 1 
ANTIOXIDANT ACTIVITY TEST OF LIDAH MERTUA (SANSEVIERIA TRIFASCIATA P.) LEAVES EXTRACT USING 1,1-DIPHENIL-2-PIKRILHIDRAZIL Rihanah Rihanah; Minarni Rama Jura
Media Eksakta Vol 16 No 1 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (459.014 KB) | DOI: 10.22487/me.v16i1.735

Abstract

Antioxidant activity test of lidah mertua (Sansevieria trifasciata P.) leaves extract using 1,1-diphenil-2-picrylhydrazyl has been carried out. The purpose of this study was to determine the antioxidant activity of ethanol extracts of old and young leaves of lidah mertua (Sansevieria trifasciata P.). The radical concentration of 1,1-diphenil-2-picrylhydrazyl (DPPH) after the addition of ethanol extracts of old and young leaves of lidah mertua was determined using a UV-Vis spectrophotometer. The concentrations used in the ethanol extracts of old and young leaves of lidah mertua were 20 ppm, 40 ppm, 60 ppm, 80 ppm and 100 ppm. The IC50 values obtained ​​of ethanol extracts of old and young leaves of lidah mertua were 131.336 ppm and 144.568 ppm respectively, while IC50 value ​​of vitamin C as a comparison was 65.433 ppm. It can be seen that the antioxidant ethanol extracts of old and young leaves of lidah mertua are moderate compared to vitamin C.
Pengaruh Model Brain Based Learning (BBL) Terhadap Hasil Belajar Siswa Kelas XI pada Materi Laju Reaksi Hikmah Hasan Basri; Sri Mulyani Sabang; Minarni Rama Jura
Media Eksakta Vol 17 No 1 (2021)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (355.932 KB) | DOI: 10.22487/me.v17i1.835

Abstract

This study aimed to determine the influence of Brain Based Learning (BBL) model toward learning outcomes of chemistry in grade XI at SMA 7 Palu. The method used was a quasi-experiment with pretest-posttest control group design. Sampling was done by purposive with the sample of class XI Science 2 as the experimental class and class XI Science 5 as the control class. Data of students’ learning outcome was tested using non-parametric statistical analysis, i.e the Mann-Whitney test (U-Test).  Analysis of the data obtained the value of students’ learning outcomes in the experimental class (x ̅_1) was 89.16 with a standard deviation of 10.96, while in the control class students the (x ̅_2) value was 56.47 with a standard deviation of 11.50. Hypothesis testing obtained a Zcount value was 5.68 which was in the acceptance area of H1, so tha H1 was accepted and H0 was rejected. This mean that the average score of students’ learning outcomes of the experimental class was not the similar to the control class. This study concluded that the Brain Based Learning (BBL) model influenced students’ learning outcomes on reaction rate at SMAN 7 Palu..
Co-Authors Afadil Agustin Tiwow Aharudin Aharudin Ahmad Idris Alfinda D. Nande Andriana Andriana Awanda Awanda Baharuddin Hamzah Dahlia Sofiyatun Hikmah Hasan Basri Ijirana Irwan Said karmila karmila Kasmudin Mustapa Mery Napitupulu Mestawaty Mestawaty Moh. Husaini Nur Intan Nur Qamariya Nurafni Nurafni Nurasiah Nurasiah Nurdin Rahman Nurhikmah Nurhikmah Nurida Nurida Patangari, Intan Y. Paulus Hengky Abram Ratman Ratman Ratman Ratman Ria Lumbantobing Rihanah Rihanah Setiawan, Topan Sitti Aminah Sri M. Sabang Sri M. Sabang Sri Mulyani Sabang Sulaeha, Siti Supriadi Supriadi Tahril Taupik Hidayat Tri Ulandari Astaring Ulfiana Ulfiana Wayan N. Sugiani Yunita Rosida