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Journal of Tropical Life Science : International Journal of Theoretical, Experimental, and Applied Life Sciences
Published by Universitas Brawijaya
ISSN : 20875517     EISSN : 25274376     DOI : -
Core Subject : Agriculture, Social,
Agriculture, Biological Sciences & Forestry Environmental Science
The Journal of Tropical Life Science (JTLS) provides publication of full-length papers, short communication and review articles describing of new finding or theory in living system, cells and molecular level in tropical life science and related areas. The journal publishes articles that report novel findings of wide Tropical Life system phenomenon in the areas of biodiversity, agriculture, fisheries, health, husbandry, forestry and environmental technology. JTLS has 1 volume with 3 issues per year.
Arjuna Subject : -
Articles 15 Documents
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Search results for , issue "Vol. 15 No. 3" : 15 Documents clear
Composition, Diversity, and Habitat Association of Spider Species (Araneae) in Three Different Land Covers of Tangub City, Misamis Occidental, Philippines Revilleza, Chen; Socias, Maria Elezairah; Zaragoza-Magsayo, Monaliza Joy; Rivera, Rodrin; Bullong, Lynde
Journal of Tropical Life Science Vol. 15 No. 3
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.15.03.09

Abstract

Spiders are significant to ecosystems as they regulate insect populations, act as both predator and prey, and enhance biodiversity. This study examined the composition, diversity, and habitat association of spider species (Araneae) in the three different land covers of Tangub City, Misamis Occidental, Philippines. The samplings were particularly conducted in Barangay Banglay, predominantly an agricultural area, Barangay Hoyohoy, a mountainous terrain, and Barangay Caniangan, a riparian area. Transect walks and opportunistic sampling methods were used. 38 species belonging to 12 families under 27 genera were identified from the 782 individuals captured, of which 2 species were endemic and 36 non-endemics. The three sampling areas attained moderate diversity, ranging from 2.17 to 2.66, with Banglay ranking the highest. Furthermore, Banglay and Hoyohoy showed a higher similarity index value of 0.68, indicating a higher number of shared spider species, accounting for 16 species. The Canonical Correspondence Analysis (CCA) across sampling areas illustrated axis 1 as the primary ecological gradient influencing spider abundance and distribution, with eigenvalues ranging from 0.05 to 0.11. In Banglay, Herennia multipuncta and Arachnura melanura were strongly associated with both relative humidity and air temperature. In Hoyohoy, Neoscona sp. and Camaricus sp. prefer higher air temperature, while species such as Nephila pilipes, Nephila kuhlii, Nephilengys malabarensis, Gnathopalystes sp., Poltys sp., Cheiracanthium sp., and Leucauge decorata are highly influenced by relative humidity. And in Caniangan, species such as Nephila pilipes, Gasteracantha sp., and Thomisus labefactus, are closely associated with warmer microclimatic environments, whereas taxa such as Leucauge fastigata and Heteropoda venatoria prefer more humid conditions. However, low eigenvalues suggest that the measured environmental variables have minimal effect on spider species, and other factors may play a more significant role. Key threats include habitat degradation across all sampling areas. The study recommends implementing targeted conservation measures and enforcing policies to preserve the integrity of the areas and protect the spider populations.
High-Dose Gamma Irradiation Reduces Pathogenic Bacteria While Preserving Beneficial Taxa in Indonesian Traditional Food ‘Gudeg’ Pratama, Indra Mustika; Benita, Ashri Mukti; Hermanto, Feri Eko; Lasmawati, Deudeu; Kadir, Idrus; Sugoro, Irawan
Journal of Tropical Life Science Vol. 15 No. 3
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.15.03.10

Abstract

Gudeg, a traditional Indonesian dish, is highly susceptible to microbial spoilage. Irradiation technology can be utilized to extend the shelf life of gudeg while preserving its nutritional value. However, the effects of gamma irradiation on the bacterial abundance in food products have not been widely researched. This study investigated how gamma irradiation influences its bacterial community. Vacuum-packed gudeg was gamma-irradiated in a frozen condition at a dose of 20 kGy, with a dose uniformity ratio (DUR) of 1.08. The resulting microbiome was characterized via 16S rRNA sequencing, using non-irradiated gudeg as a comparison. Gudeg samples were then amplified using the standard 16S rRNA V3-V4 primers. After taxonomic classification, alpha diversity indices—Shannon, Margalef, Chao1, and ACE—were applied to compare species richness and evenness in irradiated and non-irradiated samples. The research results showed that irradiation substantially reduced Proteobacteria, particularly staphylococcal species, while preserving beneficial lactic acid bacteria, such as Weissella sp. The overall diversity slightly decreased, but pathogenic risks diminished, indicating extended shelf stability. These findings suggest gamma irradiation as an effective strategy to enhance gudeg's safety and longevity. Furthermore, they offer insights into broader applications of irradiation for preserving high-moisture, ready-to-eat foods and indicate that sustainable research into the effects of irradiation on spoilage microbes and specific pathogens in various traditional food products is possible.
Preparation, Optimization and Physicochemical Characterization of a Biodegradable Core-Shell Chitosan/Alginate Hydrogel Composite Misson, Mailin; Max Michael Samson; Yong , Wilson Thau Lym; Suryani Saallah; Hesham El Enshasy
Journal of Tropical Life Science Vol. 15 No. 3
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.15.03.14

Abstract

Excessive and inefficient fertilizer use in agriculture poses significant environmental and economic concerns, creating a demand for sustainable alternatives. Natural polymer-based hydrogels, particularly those derived from biopolymers such as chitosan and alginate, offer promising potential due to their biodegradability, biocompatibility, and water-retaining properties. However, limited studies have systematically optimized core–shell hydrogel systems based on natural polymers for their potential as nutrient carriers particularly in agricultural applications. The present study focuses on the preparation, statistical optimization and characterization of a core–shell chitosan/alginate (Chi/Alg) hydrogel system using CaCl₂ as a crosslinker. Key formulation parameters including polymer and crosslinker concentrations were optimized to enhance swelling capacity, water retention, and hydrogel yield. Results showed that higher chitosan concentrations led to significantly greater swelling (up to 1652%), while increased crosslinker concentrations accelerated water loss. Water retention improved at lower alginate–CaCl₂ concentrations, and hydrogel yield increased with higher alginate–chitosan ratios. Core–shell thickness varied with solidification time (1–40 minutes), ranging from 404.11 ± 18.47 µm to 735.33 ± 24.31 µm. Physicochemical characterization confirmed the materials’ structural composition and suitability as a nutrient carrier. SEM-EDX revealed particle sizes of 38–225 µm with porous, fibrous morphologies in hydrated form and successful Ca²⁺ crosslinking. FTIR spectra showed ionic interactions and characteristic shifts in amide groups. This study presents a novel, biodegradable core–shell hydrogel system optimized for nutrient carrier potential, contributing to the advancement of eco-friendly materials in sustainable agriculture.
Natural Deep Eutectic Solvent–Extracted Old and Young Mangrove Avicennia marina Leaves: Comparative Antibacterial Activity Against Propionibacterium acnes Djamaludin, Heder; Firdaus, Shelina Innasa; Suprayitno, Eddy; Yahya, Yahya; Arisandi, Desy; Ahmad, Mirza Gulam; Tambunan, Jeny Ernawati; Ahmad, Nurul Hawa; Ramli, Nurul Shazini; Kartikaningsih, Hartati
Journal of Tropical Life Science Vol. 15 No. 3
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.15.03.13

Abstract

Acne vulgaris is a common inflammatory skin disorder largely associated with the proliferation of Propionibacterium acnes. Although antibiotics are widely used for acne treatment, the increasing incidence of antibiotic resistance necessitates the exploration of effective natural alternatives. Mangrove plants are known to contain diverse bioactive compounds with antimicrobial potential. This study aimed to evaluate the antibacterial activity of Natural Deep Eutectic Solvent (NADES) extracts derived from young and old leaves of Avicennia marina against P. acnes. Extraction was conducted using citric acid–glucose-based NADES with different molar ratios: P1 (1:1), P2 (2:1), P3 (3:1), and P4 (4:1), to assess the effect of solvent composition on antibacterial performance. Antibacterial activity was determined using inhibition zone assays, while molecular docking analysis was performed to investigate interactions between extracted metabolites and P. acnes target proteins. The results showed that both young and old leaf extracts exhibited significant antibacterial activity, strongly influenced by the NADES formulation. Young leaf extracts produced the largest inhibition zone with the P4 formulation (24.51±0.75 mm) and the smallest with P1 (21.63±0.67 mm). Similarly, old leaf extracts showed maximum inhibition in P4 (37.38±4.34 mm) and minimum inhibition in P1 (22.62±1.40 mm). Increasing the proportion of citric acid enhanced the extraction of bioactive compounds responsible for antibacterial activity. Molecular docking confirmed strong binding affinities between key metabolites and P. acnes target proteins, supporting the experimental findings. Thus, NADES extracts of A. marina leaves, particularly those prepared using a 4:1 citric acid–glucose ratio, demonstrate strong potential as natural antibacterial agents for acne prevention and treatment.
Integrated Bacterial and Fungal Microbiome Profiling of Green Honey from Banggi Island, Sabah
Journal of Tropical Life Science Vol. 15 No. 3
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.15.03.15

Abstract

Green honey from Banggi Island, Sabah, is a premium product recognized for its distinctive color, yet its microbial composition remains poorly characterized. This study employed amplicon sequencing to investigate the microbial diversity of green honey, targeting the bacterial 16S rRNA V3 region and the fungal internal transcribed spacer one (ITS1) region. A total of 286 amplicon sequence variants (ASVs) were identified, comprising 270 bacterial and 16 fungal/yeast ASVs across 12 bacterial and 2 fungal phyla. The bacterial community was dominated by members of the phylum Pseudomonadota, with representative genera including Comamonas, Acidovorax, and Bacillus. Fungal profiling revealed a strong dominance of Zygosaccharomyces rouxii, accounting for over 98% of fungal reads. Overall, fungal sequencing reads substantially exceeded bacterial reads, indicating a fungal-enriched microbial profile in this honey sample. These findings provide the first integrated characterization of both bacterial and fungal communities in Banggi Island green honey. While the results highlight distinct microbial patterns potentially shaped by local environmental and floral factors, functional, safety, and bioactivity implications remain exploratory and warrant further investigation using complementary approaches.

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