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All Journal HAYATI Journal of Biosciences Journal of Tropical Life Science : International Journal of Theoretical, Experimental, and Applied Life Sciences Journal of Biotechnology and Natural Science International Journal of Renewable Energy Development
Wikantyoso, Bramantyo
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology

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Antimicrobial Production by an Actinomycetes Isolated from The Termite Nest Krishanti, Ni Putu Ratna Ayu; Zulfina, Deni; Wikantyoso, Bramantyo; Zulfitri, Arpiwi; Yusuf, Sulaeman
Journal of Tropical Life Science Vol 8, No 3 (2018)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (497.087 KB)

Abstract

Actinomycetes are Gram positive bacteria that have been detected in diverse ecological niches. Their member species are known to be a main source of various bioactive compounds. The discovery of Actinomycetes from diverse and unexplored resources has also been linked to increased opportunities to obtain novel bioactive compounds. Insect nest material is being investigated as a new source of novel antimicrobial producing Actinomycetes, which could be harnessed for therapeutic potential. A total of 10 Actinomycetes isolates were collected from the nest of Nasutitermes sp. in Pananjung Pangandaran Nature Reserve. These isolates were evaluated for antimicrobial activity against the challenge bacteria (Eschericia coli, Staphylococcus aureus, Bacillus subtilis, Serratia Marcescens) and fungi (Fomitopsis palustris, Fusarium oxysporum, Trichoderma viridae) by dual culture method. The result revealed that several isolate were active against fungi and bacteria. Isolate Pn-TN2 showed the highest level of antibacterial inhibition and the highest antifungal inhibition with Inhibition Rate value more than 80%. By morphological and 16S rRNA gene sequence analysis strongly suggested that the isolate Pn-TN2 belonged to Streptomyces prasinopilosus. We suggested that termite nest is a potential source of bioactive strains of cultivable Actinomycetes for future biotechnological needs.
Morphological Structure of the Body Setae as Mechanoreceptor on the Mesonotum of Telenomus remus Nixon (Hymenoptera, Platygastridae) Wikantyoso, Bramantyo; Putra, Ichsan Luqmana Indra
Journal of Biotechnology and Natural Science Vol. 3 No. 1 (2023): June
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/jbns.v3i1.9424

Abstract

Telenomus remus is parasitoid on many Lepidpoteran. Morphological analysis on T. remus is important to understand their behavior and assest the quality of parasitoid comes from the mass rearing process. However, the information of T. remus body setae cuticle characteristics were limited. This study aimed to explore the body setae on the mesonotum of of T. remus by using electron microscopy analysis and characterize their cuticle characterisics to infer the putative function of the body setae. The results showed structures that support the body setae on the mesonotum as mechanoreceptor. The structure included the long and dangling seta peg, a socket, and a gap between a socket and the base of the seta peg. The putative function related to the biology and behavior of T. remus were discussed.
Termites as Soil Engineers: A Study on Organic Carbon and Nutrient Dynamics using Baiting Techniques in Tropical Forest Ecosystem Febriani, Sri Rezeki; Ariyanto, Dwi Priyo; Cahyono, Ongko; Tarmadi, Didi; Wikantyoso, Bramantyo; Himmi, Setiawan Khoirul; Zaki, Muhamad Khoiru
HAYATI Journal of Biosciences Vol. 33 No. 2 (2026): March 2026
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.4308/hjb.33.2.394-403

Abstract

This study explores how termite activity affects soil chemistry, those are Soil Organic Matter (SOC) and nutrient dynamics in pine and mahagony forest of varying ages in the Bromo Forest, Indonesia. Termite activity was assessed using wooden poles placed in PVC pipes as bait, which also served for soil sampling. The results showed significant differences in SOC and total NPK levels among different pole damage classes in each forest. The highest values were observed in pole damage class 4. Termite-influenced soil, especially those affected by the genera Macrotermes sp., Microtermes sp., and Schedorhinotermes sp., showed the highest concentrations of SOC and NPK (4.97%, 0.51%, 15.42 mg/100 g, and 45.9 mg/100 g, respectively). The termite diversity index showed moderate diversity in all pine forests and low diversity in mahogany forests. The termite diversity index indicated moderate diversity in pine forests and low diversity in mahogany forests, likely influenced by bait type. These results demonstrate that termite activity significantly enhances soil nutrient content and can be used as an indicator of soil fertility status in tropical forest ecosystems.
Enhancing solid fuel potential of water hyacinth: A study on chemical modification through composting and demineralization Mustagfirin, Mustagfirin; Hermawan, Dede; Nawawi, Deded Sarip; Kusumah, Sukma Surya; Ismayati, Maya; Sutiawan, Jajang; Ningrum, Riska Surya; Wikantyoso, Bramantyo
International Journal of Renewable Energy Development Vol 15, No 1 (2026): January 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.61468

Abstract

Rapid growth makes water hyacinth (WH) an exceptional biomass resource, but its low calorific value and elevated ash content hinder its application as a sustainable green energy source. This study aims to enhance the quality of water hyacinth as a solid fuel by increasing lignin content through composting and decreasing ash content by demineralization. The composting period for water hyacinth was modified to 4, 7, 11, and 15 days, followed by a demineralization process employing two solvents: water and 5% nitric acid (HNO₃). Proximate, ultimate, and chemical studies were conducted on water hyacinth before and following treatment to ascertain its specific alterations. This study indicates that after 15 days of composting, the lignin fraction increased from 10.01% to 15.14%. Demineralization employing a combination of water and nitric acid can substantially reduce ash content (19.4%). The demineralization of raw materials during composting is more efficacious in diminishing ash content than the demineralization of raw materials before composting. The most significant reduction was 46.17%, observed in the 11-day WH composting, where the ash content decreased from 22% to 11.84%. According to the results, modified WH is a viable raw material for solid fuel due to its enhanced lignin content and reduced ash level.
Co-Authors Dede Hermawan Deded Sarip Nawawi Dwi Priyo Ariyanto Febriani, Sri Rezeki Himmi, Setiawan Khoirul Ichsan Luqmana Indra Putra, Ichsan Luqmana Indra Ismayati, Maya Krishanti, Ni Putu Ratna Ayu Kusumah, Sukma Surya Muhamad Khoiru Zaki Mustagfirin Mustagfirin Ningrum, Riska Surya Ongko Cahyono Sutiawan, Jajang Tarmadi, Didi Yusuf, Sulaeman Zulfina, Deni Zulfitri, Arpiwi