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All Journal JBIO: jurnal biosains (the journal of biosciences) Jurnal Pelita Pendidikan
Mhd Yusuf Nasution
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Immunology & microbiology Medicine & Pharmacology Social Sciences

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Coliform AND Escherichia coli TESTS IN THE AIR OF THE WELLS OF THE VILLAGE SIDO MAKMUR KUALA DISTRICT LANGKAT DISTRICT Wulandari Wulandari; Mhd Yusuf Nasution; Hudson Sidabutar; Ahmad Shafwan S Pulungan
JBIO: jurnal biosains (the journal of biosciences) Vol 8, No 1 (2022): JBIO: jurnal biosains (the journal of biosciences)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jbio.v8i1.18755

Abstract

Dug well water is a source of clean water that is used by 99.39% of the residents of Sido Makmur Village, Kuala District, Langkat District to meet their daily needs. The majority of people who have cow pens around dug wells trigger the importance of conducting microbiological water quality research, given the existence of dug wells that are very vulnerable to cow manure contamination. Therefore the research sample was taken based on the distance of the dug well with a cattle pen that is less than 5 meters. Five samples from Inpres Hamlet, Petak Dua Hamlet, Handayani Hamlet, Sidorejo Hamlet and Mandailing Hamlet were tested using the Most Probable Number (MPN) method in the North Sumatra Province Health Laboratory, to determine the presence of Coliform and Escherichia coli through the estimation test, assertion test , and test the completeness and coloring of grams. Then a biochemical reaction test is performed to confirm the presence of Escherichia coli. The results showed that all dug well water samples with sample codes ASG 01, ASG 02, ASG 03, ASG 04 and ASG 05 were positively polluted by Coliform through assertion tests with total Coliform exceeding the 80% threshold and below the threshold of 20% based on Minister of Health Regulation No. 416 / MENKES / PER / IX / 1990 concerning Requirements and Supervision of Water Quality. Then there is also the content of Escherichia coli in the five samples which exceeds the established threshold, the positive results of E.coli have also been strengthened through the results of gram staining and biochemical reaction tests. Therefore the dug well water samples tested are not feasible or do not meet the microbiological quality requirements for clean water.
PERBEDAAN HASIL BELAJAR SISWA MENGGUNAKAN MODEL KOOPERATIF GROUP INVESTIGATION DENGAN SNOWBALL THROWING PADA MATERI STRUKTUR DAN FUNGSI JARINGAN TUMBUHAN Sri Lestari; Mhd Yusuf Nasution
Jurnal Pelita Pendidikan Vol 7, No 3 (2019): Jurnal Pelita Pendidikan
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpp.v7i3.13793

Abstract

Penelitian ini bertujuan untuk mengetahui perbedaan hasil belajar siswa yang diajar menggunakan model pembelajaran kooperatif Group Investigation dengan Snowball Throwing pada materi Struktur dan Fungsi Jaringan Tumbuhan di kelas XI IPA SMA Negeri 1 Binjai Kabupaten Langkat Tahun Pembelajaran 2018/2019. Populasi dalam penelitian ini adalah seluruh siswa kelas XI IPA SMA Negeri 1 Binjai yang terdiri dari 4 kelas. Sampel diambil secara acak dan diperoleh sampel untuk kelas Group Investigation (XI IPA 1) sebanyak 35 orang dan untuk kelas Snowball Throwing (XI IPA 2) sebanyak 35 orang. Instrumen yang digunakan adalah tes hasil belajar siswa dalam bentuk pilihan ganda yang berjumlah 25 soal yang sudah divalidkan terlebih dahulu. Hasil analisis data menunjukkan postest kelas Group Investigation dengan nilai rata-rata SD ± 79,2, sedangkan kelas Snowball Throwing  dengan nilai rata-rata SD ± 56,22. Hasil uji t-test diperoleh thit > ttab yaitu 511,9 > 1,99 dengan taraf signifikan α = 0,05, jadi Ha diterima dan Ho ditolak. Hal ini menunjukkan adanya perbedaan hasil belajar siswa dengan menggunakan model pembelajaran kooperatif tipe Group Investigation dengan tipe Snowball Throwing pada materi struktur dan fungsi jaringan tumbuhan kelas XI IPA SMA Negeri 1 Binjai Kabupaten Langkat T.P 2018/2019.Kata Kunci : Group Investigation, Hasil Belajar Siswa, Snowball Throwing
ANALISIS KEMAMPUAN KOGNITIF DAN KESULITAN BELAJAR SISWA MATERI SISTEM EKSKRESI DI SMA NEGERI 1 KARANG BARU Fitri Amini; Mhd Yusuf Nasution; Mulkan Mulkan; Hartati Sugito
Jurnal Pelita Pendidikan Vol 6, No 4 (2018): Jurnal Pelita Pendidikan
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpp.v6i4.11053

Abstract

This study aims to determine students' learning difficulties in the excretory system material in terms of cognitive aspects and learning indicators as well as the factors causing student learning difficulties in class XI IPA 1 Karang Baru at the year learning 2017/2018. The research design used is quantitative descriptive. Samples were taken by purposive sampling with a total of 95 students. The technique of data collection used  diagnostic and questionnaire tests. The results showed that the percentage of students' learning difficulties from the highest to the lowest on the cognitive aspects they are C6, C4, C5, C3, C1 and C2 of 47.37%,for amount 46.5%, 46.00%, 39.61%, 34.74 % and 26.53%. The percentage of student learning difficulties based on indicators on the excretion system material are  indicator 1 amount 28.95% medium category, indicator 2 amount 46.02% of very high category, indicator 3 amount 39.89% of high category and indicator 4 amount 42.32% of category high. Internal and external factors that cause the learning difficulties of learning difficulties from the highest to the lowest percentage are family (63,15%), interest (63,02%), school (63,00%), psychology (46,57%), teaching methods (45,21%), material (44,42%), motivation (44,21%), media (44,21%), teachers (44,12%) and health (44,03%).Keywords: Cognitive Aspects, Learning Indicators, Learning Difficulties, Excretion Systems
Co-Authors Ahmad Shafwan S Pulungan Fitri Amini Hartati Sugito Hudson Sidabutar Mulkan Mulkan SRI LESTARI Wulandari Wulandari