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All Journal Kappa Journal Bioscientist : Jurnal Ilmiah Biologi
Abdul Gani
Universitas Mataram
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Education Immunology & microbiology Physics Social Sciences Other

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Pengaruh Variasi Suhu Kalsinasi terhadap Struktur Kristal dan Sifat Mekanik Hidroksiapatit dari Limbah Cangkang Kerang Mutiara Susi Rahayu; Dian W. Kurniawidi; Siti Rubi’ah; Hurnah Hurnah; Abdul Gani; Siti Alaa
Kappa Journal Vol 9 No 3 (2025): Kappa Journal
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i3.33013

Abstract

Hydroxyapatite (HAp is widely known as a promising biomaterial because its chemical composition closely resembles that of human bone and teeth, making it suitable for biomedical uses such as bone tissue engineering and implant materials. This study explores how variations in calcination temperature (750–950 °C) affect the crystal structure and mechanical properties of HAp synthesized from Pinctada maxima shells—a calcium-rich biogenic waste. The crystal structure was analyzed using X-ray Diffraction (XRD), while mechanical properties were evaluated using a Tensilon testing machine. The XRD results showed a phase shift from the dominance of tricalcium phosphate (TCP) at low temperatures towards the dominant HAp phase at high calcination temperatures with improved crystallinity from 33.94% to 45.89%. The mechanical tests showed compressive strength values of 0.1981 to 0.3148 MPa and the elastic modulus of 14.941 to 26.721 MPa. The higher calcination temperature tends to increase the cristallinity, density, and compressive strength, but reduced elasticity due to a stiffer internal structure. These results indicate that changes in crystal structure have a direct effect on increasing the compressive strength and stiffnes of the material.  This study confirms the potential ofPinctada maxima shells as a sustainable calcium source for producing high-quality hydroxyapatite suitable for biomedical applications.
Ekowisata Mangrove Lembar Selatan: Tinjauan Sosial Ekonomi dan Pemanfaatan Ekologis dalam Mendukung Sustainable Circular Economy dan Pembelajaran IPA Kontekstual Abdul Gani; Ahmad Aris Arifin; Ahmad Fauzi; Muhammad Yustiqvar; Agil Al Idrus; A. Wahab Jufri
Bioscientist : Jurnal Ilmiah Biologi Vol. 13 No. 4 (2025): December
Publisher : Department of Biology Education, FSTT, Mandalika University of Education, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/bioscientist.v13i4.18407

Abstract

This study aims to analyze the ecological utilization of mangroves, examine the socio-economic aspects of the local community, and assess the relationship between these uses, conservation efforts, and the educational potential of the area. The urgency of the research lies in the need to integrate ecological utilization, socio-economic sustainability, and the application of a Sustainable Circular Economy, while simultaneously strengthening the role of mangrove ecotourism areas as sources of contextual science learning. The research employed a descriptive approach with data collected through structured in-depth interviews and questionnaires administered to 10 respondents. Data were analyzed using a mixed method, consisting of qualitative descriptive analysis for interview results and quantitative descriptive analysis for questionnaire data. The findings indicate that mangrove utilization is mainly limited to the collection of dead wood due to local regulations, while the exploitation of fauna (mollusks, crabs, and fish) is more dominant as a source of income. Community participation in conservation is relatively high, but knowledge regarding the medicinal benefits of mangroves remains low. These results highlight the need to strengthen sustainable, circular-economy-based utilization and to optimize the area as a source of contextual science learning.
Co-Authors A. Wahab Jufri Agil Al Idrus Ahmad Aris Arifin Ahmad Fauzi Alaa, Siti Dian Wijaya Kurniawidi Hurnah Hurnah Muhammad Yustiqvar Siti Rubi’ah Susi Rahayu