Article Per Year (5 Year)
p-Index From 2020 - 2025
0.23
P-Index
This Author published in this journals
All Journal CHEDS: Journal of Chemistry, Education, and Science JOURNAL OF CHEMICAL NATURAL RESOURCES (JCNaR)
Yusak, Yuniarti
Unknown Affiliation
Biochemistry, Genetics & Molecular Biology Chemistry Education Materials Science & Nanotechnology

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
PERBANDINGAN HASIL BELAJAR SISWA MENGGUNAKAN MODEL PEMBELAJARAN KOOPERATIF TIPE STAD DAN NHT Hura, Hidayati; Yusak, Yuniarti; Budianto, Budianto; Hasanah, Uswatun
CHEDS: Journal of Chemistry, Education, and Science Vol 3, No 1 (2019)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (856.526 KB) | DOI: 10.30743/cheds.v3i1.3888

Abstract

Penelitian ini untuk mengetahui perbandingan hasil belajar siswa yang diajarkan dengan menggunakan model pembelajaran kooperatif tipe STAD dengan tipe NHT. Populasi yang digunakan 2 kelas masing-masing 30 siswa. Dimana kelas X-KA1 menjadi kelas eksperimen I (NHT) dan kelas X-KA4 menjadi kelas eksperimen II (STAD). Sampel yang digunakan adalah random sampling.  Data berdistribusi normal yaitu Lhitung ˂ Ltabel (0,0882˂0,161) untuk nilai postes kelas eksperimen I (NHT) dan  Lhitung ˂ Ltabel (0,0493˂0,161) untuk nilai postes kelas eksperimen II (STAD). Uji Homogenitas pada hasil postes diperoleh Fhitung  ˂ Ltabel (1,28˂1,86) sehingga disimpulkan populasi bersifat homogen. Nilai rata-rata postes pada kelas eksperimen I (NHT) adalah  = 5,82  dengan standar deviasi adalah S = 2,12 dan nilai rata-rata postes pada kelas eksperimen II (STAD) adalah  = 4,78 dengan standar deviasi S = 1,56. Uji hipotesis nilai thitung = 8,455 sedangkan nilai ttabel = 2,002 sehingga thitung ttabel, dengan demikian H0 ditolak dan Ha diterima.
Study on Analysis of Vitamin C and β-Carotene Levels From Tamarillo (Solanum betaceaum Cav.) Fruit Produced Between Shoot Grafting of Tamarillo with Lancing Plant (Solanum mauritianum) Zaidar, Emma; Safitri, Irma; Yusak, Yuniarti
Journal of Chemical Natural Resources Vol. 3 No. 2 (2021): Journal of Chemical Natural Resources
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (373.471 KB) | DOI: 10.32734/jcnar.v3i2.9342

Abstract

Research on studies analysis levels of vitamin C and β-carotene of the Tamarillo fruit shoot grafting between the Tamarillo plant and Lancing plant has been conducted. Analysis of vitamin C level was performed by iodometric method, and analysis of β- carotene levels were calculated using UV-Vis spectrophotometer. The research result showed that the level of vitamin C of Tamarillo fruit was 1.596%, the level of vitamin C of Lancing fruit was 0.401%, and the level of vitamin C of Tamarillo fruit grafting outcomes was 1.202%. While the level of β-carotene of Tamarillo fruit was 208.95 ppm, the level of β-carotene of Lancing fruit was 36.11 ppm and the level of - carotene of Tamarillo fruit grafting outcomes was 253.64 ppm. It can be concluded that the vitamin C levels of Tamarillo fruit grafting outcomes decreased slightly. While the β-carotene levels of Tamarillo fruit grafting outcomes increased.
Co-Authors Budianto Budianto Hura, Hidayati Irma Safitri Uswatun Hasanah Zaidar, Emma