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All Journal Biodiversitas Journal of Biological Diversity
HANASIA HANASIA
Department of Medical Laboratory Technology, Faculty of Medicine, Universitas Palangka Raya. Jl. Yos Sudarso, Palangka Raya 74874, Central Kalimantan, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Isolation and characterization of acetic acid bacteria from pineapple peel fermentation (Ananas comosus) NATALIA SRI MARTANI; HANASIA HANASIA; OKTAVIANI NAULITA TURNIP; HANDAYANI HALIK; I GDE HARY EKA ADNYANA
Biodiversitas Journal of Biological Diversity Vol. 26 No. 2 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d260227

Abstract

Abstract. Martani NS, Hanasia, Turnip ON, Halik H, Adnyana IGHE. 2025. Isolation and characterization of acetic acid bacteria from pineapple peel fermentation (Ananas comosus). Biodiversitas 26: 789-798. Pineapple (Ananas comosus) is rich in bioactive compounds and is often considered waste, especially its peel. The fermentation of pineapple peel can yield value-added goods, including probiotic drinks that promote digestive health. Acetic Acid Bacteria (AAB) are significant microorganisms in fermentation, converting ethanol into acetic acid, hence offering preservation advantages and probiotic qualities. This study aimed to isolate and characterize acetic acid bacteria from the fermentation of pineapple peel and evaluate its antibacterial properties. The fermentation occurred spontaneously without the use of a starting culture, utilizing three distinct formulas. On the third day of fermentation, the fermented liquid was extracted and characterized by 16S rRNA gene sequencing. The findings indicated that the identified AAB was Acetobacter fabarum strain 2567, exhibiting 97% homology. The antibacterial activity of A. fabarum filtrate at concentrations of 5-75% was tested against the pathogens Escherichia coli and Shigella dysenteriae using the disk diffusion method; however, no antibacterial activity was observed against either pathogen. The study underscores the need for further research to evaluate the antibacterial potential of A. fabarum against other pathogens using methods such as micro-dilution or well diffusion, highlighting the urgency of this line of investigation.
Moonlight-driven zooplankton migration shapes phytoplankton distribution in a tropical peatland pond EVI VERONICA; ARDIANOR ARDIANOR; SALAMPAK DOHONG; NATALINA ASI; AFENTINA AFENTINA; HANASIA HANASIA
Biodiversitas Journal of Biological Diversity Vol. 26 No. 9 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d260944

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Abstract. Veronica E, Ardianor, Dohong S, Asi N, Afentina, Hanasia. 2025. Moonlight-driven zooplankton migration shapes phytoplankton distribution in a tropical peatland pond. Biodiversitas 26: 4746-4760. The interaction between phytoplankton and zooplankton plays a vital role in regulating aquatic ecosystem dynamics. This study explored the vertical distribution of phytoplankton in relation to zooplankton abundance under varying lunar light conditions and assessed the influence of selected physicochemical parameters. The research was conducted in Beje Pond, Peat Techno Park (PTP), Universitas Palangka Raya, Central Kalimantan, Indonesia, with sampling performed at seven depth intervals (0-180 cm) every three days over a one-month period. A total of 20 phytoplankton species were identified, with seven dominant taxa consistently observed: Chlamydomonas nivalis, Chlorogonium elongatum, Asterococcus superbus, Staurastrum tetracerum, Zygnema sp., Closterium praelongum, and Skeletonema costatum. Phytoplankton abundance ranged from 810 to 2,232 cells/L, peaking during half-moon conditions. Zooplankton abundance reached a maximum of 765 ind/L during the ninth sampling under dim moonlight, with apparent temporal offset from phytoplankton peaks. This pattern suggests the possibility of zooplankton diel vertical migration modulated by lunar illumination. Principal Component Analysis (PCA) showed that Dissolved Oxygen (DO), temperature, and pH together accounted for 84.6% of the environmental variance. Spearman correlation analysis indicated significant positive correlations (p < 0.05) between DO and phytoplankton abundance (r = 0.59), and between phytoplankton and zooplankton (r = 0.53). No significant correlations were observed between pH and phytoplankton or between DO and zooplankton. While patterns suggest possible vertical variation linked to diel cycles and lunar phase, these findings remain correlative. Further integrative studies are recommended to investigate the ecological mechanisms driving these distributions in tropical peatland waters.
Porphyromonas gingivalis prevalence and gyrA gene detection linked to mercury exposure in periodontitis among gold miners HELENA JELITA; HARUN ACHMAD; SYAMSUL ARIFIN; DAHLIA HERAWATI; IRENE EDITH RIEUWPASSA; RASMIDAR SAMAD; ANDI ROFIAN SULTAN; HANASIA HANASIA; FIRDAUS HAMID
Biodiversitas Journal of Biological Diversity Vol. 27 No. 4 (2026)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d270437

Abstract

Abstract. Jelita H, Achmad H, Arifin S, Herawati D, Rieuwpassa IE, Samad R, Sultan AR, Hanasia, Hamid F. 2026. Porphyromonas gingivalis prevalence and gyrA gene detection linked to mercury exposure in periodontitis among gold miners. Biodiversitas 27 (4): d270437. https://doi.org/10.13057/biodiv/d270437. The oral cavity is a dynamic ecosystem hosting diverse anaerobic microorganisms that influence oral health. Porphyromonas gingivalis, a key Gram-negative anaerobe, is strongly implicated in periodontitis pathogenesis. Chronic mercury (Hg) exposure, particularly among artisanal gold miners, has been associated with microbial dysbiosis and antibiotic resistance genes. This study investigated the relationship between salivary Hg levels, subgingival anaerobic bacteria, detection of P. gingivalis and gyrA in periodontitis among gold miners. A cross-sectional design included 60 participants (30 gold miners and 30 non-gold miners). Subgingival plaque was cultured anaerobically and identified using Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS); Polymerase Chain Reaction (PCR) detected P. gingivalis and gyrA. Salivary Hg concentrations were determined using Atomic Absorption Spectrophotometry with a Mercury Vapor Unit (AAS-MVU). Median salivary Hg levels were significantly higher in miners than non-miners (0.09 µg/L [0.03-0.22] vs. 0.03 µg/L [0.03-0.03]; p<0.001), although all values remained below the 5 µg/L salivary threshold. Culture recovery was low, identifying Prevotella denticola and P. melaninogenica among miners and Bifidobacterium sp. among non-miners. PCR detected P. gingivalis in 80.00% of miners and 63.33% of non-miners (p = 0.152). In contrast, gyrA detection was higher in miners (19/30, 63.33%) than in non-miners (10/30, 33.33%, p = 0.020). Mann–Whitney analysis showed no significant differences between salivary Hg and detection of P. gingivalis (p = 0.420) or gyrA (p = 0.953). However, a significant association between P. gingivalis and gyrA was observed using the Chi-square test (χ² = 22.191, p<0.001; φ = 0.61). Although P. gingivalis prevalence did not differ significantly, chronic low-dose Hg exposure was associated with higher gyrA detection and distinct anaerobic bacteria in miners, suggesting Hg may be associated with resistance-related microbial dynamics in periodontal biofilms. Larger studies using quantitative PCR and metagenomic approaches are needed to clarify underlying mechanisms.
Co-Authors AFENTINA AFENTINA ANDI ROFIAN SULTAN ARDIANOR ARDIANOR DAHLIA HERAWATI EVI VERONICA FIRDAUS HAMID HANDAYANI HALIK HARUN ACHMAD HELENA JELITA I GDE HARY EKA ADNYANA IRENE EDITH RIEUWPASSA NATALIA SRI MARTANI NATALINA ASI OKTAVIANI NAULITA TURNIP RASMIDAR SAMAD SALAMPAK DOHONG SYAMSUL ARIFIN