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All Journal BIOLINK (Jurnal Biologi Lingkungan, Industri, Kesehatan) EKSAKTA : Jurnal Penelitian dan Pembelajaran MIPA Jurnal Biolokus: Jurnal Penelitian Pendidikan Biologi dan Biologi Martabe : Jurnal Pengabdian Kepada Masyarakat PeTeKa NUSANTARA : Jurnal Ilmu Pengetahuan Sosial Journal of Natural Sciences Jurnal Pijar MIPA
Sahlan Tuah
Universitas Muhammadiyah Tapanuli Selatan
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemistry Economics, Econometrics & Finance Education Environmental Science Mathematics Physics Social Sciences

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MODEL PEMBELAJARAN KONTEKSTUAL DALAM PENINGKATAN KEMAMPUAN BERPIKIR KRITIS BELAJAR BIOLOGI SISWA DI SMA MUHAMMADIYAH 11 PADANGSIDIMPUAN Tuah, Sahlan
PeTeKa (Jurnal Penelitian Tindakan Kelas dan Pengembangan Pembelajaran) Vol 7, No 1 (2024): PeTeKa (Jurnal Penelitian Tindakan Kelas dan Pengembangan Pembelajaran) Publish
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/ptk.v7i1.139-146

Abstract

The purpose of this study is to determine the improvement of critical thinking learning skills, increase in student biology learning activities, improve the management of biology learning through the application of contextual learning models on plantae material in grade X of SMA Muhammadiyah 11 Padangsidimpuan. The validation of the second cycle test above shows that from the questions prepared, 5 questions are invalid and 10 questions are valid according to the calculation. in the first cycle an average score of 74.32 was obtained with the number of students who completed it as many as 18 people and the remaining 7 students were declared incomplete with the applicable KKM score of 75, then the PKK score of the overall learning outcomes of the first cycle was 72.02%. In the second cycle, an average score of 78.4 was obtained with the number of students who completed reaching KKM, namely 75 was 21 people and the remaining 4 people were declared incomplete, obtained by PKK in the second cycle was 84.18% categorized (Very Good).
PENERAPAN PENDEKATAN KONTEKSTUAL BERBANTUAN LEMBAR KERJA SISWA (LKS) TERHADAP PENINGKATAN HASIL BELAJAR SISWA DI SMA NEGERI 6 PADANGSIDIMPUAN Tuah, Sahlan
NUSANTARA : Jurnal Ilmu Pengetahuan Sosial Vol 10, No 12 (2023): NUSANTARA : Jurnal Ilmu Pengetahuan Sosial
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jips.v10i12.2023.5474-5485

Abstract

The problem in this study is that the learning process in the classroom is still carried out conventionally, where learning is still dominated by teachers. So far, students learn science only based on the material in the textbook and are very far from the real life of students The purpose of this study is to determine the improvement of student biology learning outcomes through the application of a contextual approach to Cell Reproduction material in class XII of SMA Negeri 6 Padangsidimpuan for the 2021-2022 academic year. This type of research is Classroom Action Research. Where the subject of the study was class XII students of SMA Negeri 6 Padangsidimpuan consisting of 29 students. While data collection techniques and tools are tests and observations. Based on the results of the biology learning outcomes test of cycle I students of 68.9% and cycle II of 82.7%. And the results of an increase in student activity levels in cycle I by 61.7% and in cycle II by 76.3% then an increase in teacher activity in managing learning cycle I by 73.6% and cycle II by 80%.
Implementasi Model Pembelajaran Diskusi Kelas Upaya Meningkatkan Minat Peserta Didik Di Kelas VIII MTs Muhammadiyah 22 Padangsidimpuan Bangun Ritonga, Sahor; Dongoran, Putoro; Tuah, Sahlan
NUSANTARA : Jurnal Ilmu Pengetahuan Sosial Vol 6, No 2 (2019): NUSANTARA : Jurnal Ilmu Pengetahuan Sosial
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jips.v6i2.2019.221-226

Abstract

Rumusan masalah dalam penelitian ini adalah kurangnya minat peserta didik terhadap mata pelajaran Pendidikan Pancasila dan Kewarganegaraan. Penelitian ini bertujuan untuk mengetahui seberapa besar implementasi model pembelajaran diskusi kelas upaya meningkatkan minat belajar mata pelajaran pendidikan pancasila dan kewarganegaraan. Jenis penelitian yang digunakan penulis adalah penelitian Asosiatif. Instrumen penelitian adalah angket . Penulis menetapkan skor tertinggi yaitu 5 dan terendah 1. Berdasarkan analisis diatas maka diperoleh rhitung  0,835 dengan melihat daftar rtabel dengan jumlah tabel 28, selanjutnya dikonsultasikan dengan rtabel dengan taraf kesalahan yang yang ditetapkan 1% maka diperoleh harga 0,478 ternyata rhitung lebih besar dari pada rtabel yakni 0,8350,478, maka hipotesis alternative (Ha) dapat diterima artinya ada implementasi model pembelajaran diskusi kelas upaya meningkatkan minat belajar peserta  didik  di  kelas  VIII  MTs  Muhammadiyah  22  Padangsidimpuan.
Exploration of Salam Leaf Extract (Syzygium polyanthum) as a Natural Indicator for Acid-Base Titration: Color Stability and Endpoint Accuracy Nasirsah, Nasirsah; Fatma, Fatma Suryani Harahap; Siregar, Rabiyatul Adawiyah; Siregar, Elda Sari; Tuah, Sahlan
Jurnal Pijar Mipa Vol. 20 No. 7 (2025): in Progress
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v20i7.10547

Abstract

Acid-base indicators play an important role in titration, but the use of synthetic indicators such as phenolphthalein is increasingly criticized for being toxic, carcinogenic, and environmentally unfriendly. Therefore, this study was conducted with the aim of developing bay leaf extract (Syzygium polyanthum) as a safer, natural indicator, thereby supporting the concept of green chemistry. The study was carried out in four stages, namely first, extraction with ethanol: water solvent (70:30 and 50:50), second, color change test in pH 4, 7, and 10 buffer solutions using visual documentation and UV-Vis spectrophotometry. Third, validation of effectiveness in HCl–NaOH titration with phenolphthalein as a comparator. Additionally, stability and reproducibility tests were conducted over a 7-day storage period. The results showed that bay leaf extract remained stable for at least seven days, exhibiting a significant λmax change profile at 405–425 nm, which varied according to pH changes. This indicates the sensitivity of phenolic pigments to acidic, neutral, and basic conditions. In titration validation, the extract with 50/50 solvent showed an identical titrant volume to phenolphthalein (25.0 mL; deviation 0%), while the 70/30 solvent showed a deviation of -14.6%. Stability tests showed that the extract was relatively stable for up to 7 days in dark conditions with a decrease in absorbance <10%, while reproducibility tests produced inter-user variations <5%. These findings suggest that bay leaf extract has strong potential as a reliable, stable, and consistent natural indicator, making it a worthy alternative to synthetic indicators in environmentally sustainable chemistry education and research laboratories.
Co-Authors Abubakar Abubakar Adrian, Muhammad Andes Fuady Dharma Harahap Andes Fuady Harahap Andes Fuady Harahap, Andes Arni Maya Atifah, Yusni Bangun Ritonga, Sahor Dakkal Harahap Dongoran, Putoro Elda Sari Siregar Elisa Elisa Elisa Elisa Fatma Suryani Harahap Fatma, Fatma Suryani Harahap Fauzi Siregar, Rahmat Gusmaniar, Gusmaniar Hamid Marpaung, Paisal Harahap, Andes Fuady Dharma Hasanah Nasution Heni Mulyani Pohan Herdiani Herdiani Ira Anugrah Jalilah Azizah Lubis N Ginting Nasirsah, Nasirsah Nur Sahara Nur Sahara Nurkholidah Siregar Nurmaini Ginting Padhilah, Suci Rabiyatul Adawiyah Siregar Rabiyatul Adawiyah Siregar Rizky Ariaji, Rizky Saputra, Riska Siregar, Nurkholidah Viva Mulyana Zulhandri Zulhandri