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Literature Study on Food Preservation Methods and Their Effects on Product Quality and Shelf Life Novelina Andriani Zega; Mashati Bate'e; Marina Gea; Dewi Sandra Zamili; Irene Infak Halawa; Lestariani Zebua; Seniman Putri Sari Zega
GEN BIONIX: Jurnal Ilmiah Pendidikan Biologi Vol 4 No 2 (2026): GEN BIONIX: Jurnal Ilmiah Pendidikan Biologi
Publisher : Program Studi Pendidikan Biologi - Universitas Nias

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56207/genbionix.v4i2.962

Abstract

Food preservation is an essential technology in the food industry aimed at maintaining product quality, ensuring food safety, and extending shelf life. Various preservation methods have been developed, ranging from conventional techniques such as refrigeration, freezing, drying, and fermentation to modern technologies including vacuum packaging, Modified Atmosphere Packaging (MAP), edible coatings, and non-thermal processing. This article aims to review different food preservation methods and analyze their effects on food quality and shelf life based on published scientific studies. The research employed a literature review method by collecting and analyzing relevant national and international journal articles on food preservation technologies. The findings indicate that each preservation method operates through different mechanisms to inhibit microbial growth, enzymatic activity, and chemical reactions responsible for food deterioration. Refrigeration and freezing effectively slow biological spoilage, while drying reduces moisture content and limits microbial growth. Fermentation enhances product stability and may improve functional properties. Furthermore, modern preservation technologies, such as MAP, edible coatings, and non-thermal methods, have demonstrated greater effectiveness in maintaining nutritional value, color, texture, and sensory characteristics of food products. Combining multiple preservation techniques often provides superior results in extending shelf life without significantly compromising product quality. Therefore, selecting appropriate preservation methods is crucial for maintaining food quality, ensuring safety, and minimizing postharvest losses during storage and distribution.
Teacher Professionalism in Learning Implementation An Exploratory Study at SMP Negeri 5 Lahewa Marina Gea; Asnil Zebua; Erlin Karlin Telaumbanua; Esni Perdamaian Gulo; Ike Nirwana Waruwu; Riska Indah Ester Liana Zebua; Natalia Kristiani Lase
GEN BIONIX: Jurnal Ilmiah Pendidikan Biologi Vol 4 No 2 (2026): GEN BIONIX: Jurnal Ilmiah Pendidikan Biologi
Publisher : Program Studi Pendidikan Biologi - Universitas Nias

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56207/genbionix.v4i2.980

Abstract

Teacher professionalism is one of the key factors influencing the quality of education and the effectiveness of learning implementation in schools. This study aimed to explore teacher professionalism in learning implementation at SMP Negeri 5 Lahewa, North Nias Regency, Indonesia. The study employed a descriptive qualitative approach. Data were collected through interviews, observations, and documentation involving the school principal and a science teacher as key informants. The collected data were analyzed using data reduction, data presentation, and conclusion drawing techniques. The findings revealed that teacher professionalism at SMP Negeri 5 Lahewa is generally well implemented. Most teachers have obtained teaching certification and demonstrate commitment to their professional responsibilities. Teachers prepare instructional materials, teaching modules, worksheets, and learning media before conducting classroom instruction. Learning activities are carried out using various teaching methods that encourage student participation and active engagement. The school also supports teacher professionalism through academic supervision, participation in teacher professional development programs, seminars, training activities, and subject teacher forums (MGMP). In science learning, teachers attempt to connect scientific concepts with students’ daily experiences and utilize available laboratory facilities to support practical activities. However, several challenges remain, including differences in students’ learning abilities and limitations in laboratory facilities. Overall, teacher professionalism at SMP Negeri 5 Lahewa contributes positively to the effectiveness of learning implementation and educational quality improvement.