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All Journal Jurnal Biologi Tropis Berita Biologi
Ari Hepi Yanti
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology

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Antibacterial Activity of Streptomyces sp. NrASA6 Culture Extract Isolated from Nypa Palm Worm Substrate against Escherichia coli, Staphylococcus aureus, and Aeromonas sp. NrBF9 Henno Wisnu Putra; Kurniatuhadi, Rikhsan; Tri Rima Setyawati; Ari Hepi Yanti
Jurnal Biologi Tropis Vol. 24 No. 1 (2024): Januari - Maret
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v24i1.6469

Abstract

Aquaculture is an effort to maintain aquatic commodities aimed at increasing cultivation. Probiotics are one of the components needed to serve as food additives that can prevent pathogenic bacterial infections in animals. One of the Actinomycetes species that has the potential to be used as a probiotic is Streptomyces sp. These species are known to be able to inhibit patogenic bacterial infections. The purpose of this research is to know about the antibacterial activity of the isolates Streptomyces sp. NrASA6 inhibiting the growth of Escherichia coli, Staphylococcus aureus, and Aeromonas sp. NrBF9, as well as the optimal for the test bacteria. The methods used in the antibacterial test are the agar diffusion method with pits and the swabbing method on the surface of medium MHA. The test treatment included incubation on time for Streptomyces sp. NrASA6, divided into 10, 15, 20, and 25 days. The tests were conducted at incubating temperatures of 30 °C and the diameter of the clear zone for 24 and 48 hours. The results of this research were that Streptomyces sp. NrASA6 made slowly for the patogenic bacterial Aeromonas sp. NrBF9 with a diameter of 16.97±1.15 mm for 24 hours, while an inhibition zone did not form on Escherichia coli and Staphylococcus aureus bacteri. The characteristic inhibiton of culture extract 15 days for Streptomyces sp. NrASA6 is bacteriostatic. The incubation period of Streptomyces sp. NrASA6 is influential in the stationary phase, namely 15th days after incubation.
KEPADATAN DAN POLA PERSEBARAN KELASI (Presbytis rubicunda) DI BUKIT BAKA TAMAN NASIONAL BUKIT BAKA BUKIT RAYA KALIMANTAN BARAT Pranadi, Resqi; Junardi; Ari Hepi Yanti; Marsaidi, Dodi
Berita Biologi Vol 24 No 2 (2025): Berita Biologi
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/berita_biologi.2025.4945

Abstract

Kelasi (Presbytis rubicunda) adalah salah satu spesies endemik pulau Borneo dan Karimata yang termasuk kedalam satwa liar dilindungi dan berstatus rentan (vulnerable). Berbagai ancaman terhadap kelasi dapat mempengaruhi kepadatan dan pola persebarannya. Tujuan dari penelitian ini untuk mengetahui kepadatan dan pola persebaran kelasi di jalur pendakian Bukit Baka kawasan Taman Nasional Bukit Baka Bukit Raya. Pengamatan kelasi menggunakan metode line transect distance sampling (LTDS) dengan variasi metode King. Analisis data untuk mendapatkan nilai kepadatan kelasi didapatkan menggunakan formula metode King sedangkan pola persebaran kelasi menggunakan formula indeks Morisita terstandarisasi. Pengambilan data dilakukan sepanjang 14,99 km dengan tiga kali ulangan yang mendapatkan 16 individu dengan jumlah individu paling banyak ditemukan pada pagi hari. Kepadatan individu kelasi didapatkan sebesar 6,7 individu/km2 dengan pola persebaran seragam.
Co-Authors Henno Wisnu Putra Junardi Junardi Marsaidi, Dodi Pranadi, Resqi Rikhsan Kurniatuhadi, Rikhsan Tri Rima Setyawati