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All Journal Biodiversitas Journal of Biological Diversity
YOGA DWI JATMIKO
Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Brawijaya. Jl. Veteran, Malang 65145, East Java, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Coffea liberica leaf and tree architecture model of confusing accession in Poncokusumo, Malang District, East Java, Indonesia ERONA WAFARETTA; YOGA DWI JATMIKO; WENNY BEKTI SUNARHARUM; LUCHMAN HAKIM
Biodiversitas Journal of Biological Diversity Vol. 24 No. 5 (2023)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d240563

Abstract

Abstract. Wafaretta E, Jatmiko YD, Sunarharum WB, Hakim L. 2023. Coffea liberica leaf and tree architecture model of confusing accession in Poncokusumo, Malang District, East Java, Indonesia. Biodiversitas 24: 3073-3080. Some Coffea liberica W.Bull varieties appear in the same garden with the same planting pattern in the Poncokusumo. This could be due to differences in tree architecture from one accession to another. This research aims to identify the architectural and morphological characteristics of C. liberica stems and leaves and determine differences in coffee variety accession through morphological differences in C. liberica plants and leaf architecture. The research was conducted from July 2021 to August 2022 in the C. liberica plantation in Poncokusumo Sub-district, Malang District, East Java, Indonesia. The research sample consisted of four C. liberica trees from each accession and was carried out in four stages: observation, data/image recording, measurement, and data analysis. This research found: each accession has a different plant architecture model and a different branching model; three accessions appear to have different leaf morphological characters, namely margin type, apex angle, and base angle; dendrogram and PCoA results show that each accession has significant differences. Further research at the genetic level and the effect of abiotic or biotic elements on the growth and development of this coffee tree is necessary to enlighten the C. liberica variety's high potential for the growth of this coffee production in the local community.
Isolation, identification, and enzyme optimization of proteolytic lactic acid bacteria from tuna viscera by-products YOGA DWI JATMIKO; ARLISA M. R. MUARIF
Biodiversitas Journal of Biological Diversity Vol. 26 No. 6 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d260621

Abstract

Abstract. Jatmiko YD, Muarif AMR. 2025. Isolation, identification, and enzyme optimization of proteolytic lactic acid bacteria from tuna viscera by-products. Biodiversitas 26: 2762-2772. Fish processing by-products, particularly protein-rich viscera, are underutilized despite their potential to be converted into bioactive peptides using protease enzymes produced by Lactic Acid Bacteria (LAB). This study aimed to isolate proteolytic LAB from tuna viscera, identify the strain with the highest proteolytic activity, and optimize the growth conditions for enhanced protease enzyme production. Proteolytic LAB were isolated from tuna viscera and screened for enzyme activity using skim milk agar and tyrosine-based assays. The isolate with the highest proteolytic activity was identified through 16S rDNA sequencing. Protease production was then optimized using Response Surface Methodology (RSM) based on a Central Composite Design (CCD) with Design-Expert software, evaluating the effects of pH, tuna viscera concentration, and incubation time. The proteolytic potential of 12 LAB isolates from tuna viscera was obtained. The isolate of VT11 showed the highest enzyme activity of 0.55 U mL-1 among the proteolytic LAB strains. After conducting 16S rDNA sequencing, VT11 was identified as Pediococcus pentosaceus, exhibiting 99.72% similarity. Furthermore, RSM analysis identified 24 hours of incubation at pH 5 with 15% tuna viscera as the optimal conditions for protease production by P. pentosaceus VT11.
Co-Authors ARLISA M. R. MUARIF ERONA WAFARETTA LUCHMAN HAKIM WENNY BEKTI SUNARHARUM