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All Journal Lantanida Journal Jurnal Penelitian Pendidikan IPA (JPPIPA)
Rahmad Rizki Fazli
Universitas Syiah Kuala
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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VARIASI SUMBER KARBON TERHADAP PRODUKSI BIOSURFAKTAN OLEH BAKTERI HALOFILIK ISOLAT TAMBAK GARAM KAJHU ACEH BESAR Rahmad Rizki Fazli; Latifah Hanum; Mieke Alvionita; Said Ali Akbar
Lantanida Journal Vol 10, No 1 (2022)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v10i1.14108

Abstract

This research has isolated one type of halophilic bacterial strain from the salt pond of Kajhu Village with the code KJ-AB2. This bacterium grew optimally at 10% (w/v) NaCl so it was classified as moderate halophilic bacteria. Several types of halophilic bacteria are known to produce biosurfactants. Biosurfactants are surface active agents that are widely used in several pharmaceutical, food dan petroleum industries. The production of biosurfactants is strongly influenced by the type of carbon source used for bacterial growth. Olive oil, palm oil, sunflower oil, glucose dan glycerol are types of carbon sources used to see their effect in producing biosurfactants. This isolate growed well on the five carbon sources with an average OD600 2.001±0.293 at 72 hours of fermentation. Biosurfactant production was measured by oil spreading test (OST) every 24 hours until 120 hours of fermentation. The highest OST value was obtained when KJ-AB2 isolate was grown on biosurfactant production media using olive oil, sunflower oil dan palm oil with an average OST value of 5.6±0.6 cm, 4.7±0.6 cm, dan 4.6±0.7 cm, respectively.
DEVELOPMENT OF STUDENT WORKSHEETS BASED ON PEER LED TEAM LEARNING MODEL ON COLLOIDAL MATERIAL Zulfadli Zulfadli; Isyqa Silma; Habibati Habibati; Kana Puspita; Latifah Hanum; Rahmad Rizki Fazli
Lantanida Journal Vol 11, No 1 (2023)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v11i1.15704

Abstract

To further improve achievement of the given learning objectives, chemistry learning requires instructional materials that encourage active engagement of students. The goal of this research was to create student worksheets based on Peer Led Team Learning (PLTL) on colloid material, to establish the validity of student worksheets based on PLTL on colloid material, and assess teacher and student responses to worksheets. PLTL based students on colloid material that has been developed. This research approach is known as research and development (R&D), and it is carried out utilizing the 4D model (define, design, develop, and disseminate). Purposive sampling was used for the sample technique. The study was carried out at four schools: MAN 3, SMAN 5, SMAN 12, and SMAN 15 Adidarma Banda Aceh. Validating the practicality of student worksheets and questionnaire responses from teachers and students were used to obtain data. This study obtained the following results: (1) validation of the feasibility of student worksheets by expert validators of 92.3% and based on the chemistry teacher's assessment of 86.5% in the very good or valid category; (2) results of the teacher's responses to the students' worksheets obtained a percentage of 88.1% in the very good category; and (3) results of the students'responses to the students' worksheets obtained a percentage of 79.9% in the good category. Based on the findings, it is possible to infer that the student worksheet based on PLTL on colloid material is appropriate for use as teaching material on colloid material.
Audiovisual Media Based on Tapai Singkong Local Wisdom in Project-Based Learning for Science Concept Understanding, Environmental Care Attitudes, and SDGs Nurliza; Sri Winarni; A. Halim; Rahmad Rizki Fazli; Richa Purmayasari
Jurnal Penelitian Pendidikan IPA Vol 12 No 7 (2026)
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i7.15773

Abstract

Science instruction in many schools remains verbalistic and disconnected from students' everyday experiences, limiting conceptual understanding and environmental care attitudes. This study examined the effectiveness of audiovisual-based learning grounded in local wisdom for improving science concept understanding and environmental care attitudes among ninth-grade students at SMP Negeri 3 Singkohor, Aceh Singkil, using a sequential explanatory mixed-methods design. A one-group pretest-posttest design was applied to ten students using a validated 20-item multiple-choice instrument, followed by a qualitative phase with six purposively selected students representing high, medium, and low conceptual gain, examined through participatory observation, interviews, and documentation. The average score rose from 61.00 to 91.50, yielding an N-Gain of 0.79 (high category), though the small sample limits statistical generalization. Qualitative findings showed local wisdom bridged abstract concepts, and environmentally responsible behaviors emerged spontaneously at school, though this awareness did not consistently extend to plastic use at home. These results suggest that local-wisdom-based audiovisual learning can strengthen conceptual understanding and environmental awareness, while broader application warrants further testing.
Co-Authors A Halim Alvionita, Mieke Habibati Habibati Isyqa Silma Kana Puspita Latifah Hanum Nurliza Richa Purmayasari Said Ali Akbar Sri Winarni Zulfadli Zulfadli