Article Per Year (5 Year)
p-Index From 2021 - 2026
0.444
P-Index
This Author published in this journals
All Journal Reaktor Bioma : Berkala Ilmiah Biologi Jurnal Natur Indonesia Biopropal Industri JURNAL BIOLOGI INDONESIA Squalen Bulletin of Marine and Fisheries Postharvest and Biotechnology ANNALES BOGORIENSES Jurnal Pascapanen dan Bioteknologi Kelautan dan Perikanan Teknologi Indonesia Annales Bogorienses Berita Biologi
Ahmad Thontowi
Research Center for Biotechnology-LIPI
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Energy Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology

Published : 27 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 4 Documents
Search
Journal : ANNALES BOGORIENSES

 1 
Optimization of Substrate and Starter Cell Concentrations for Dibenzothiopene Biodegradation by Indigeneous Marine Bacteria Mauricauda olearia LBF-1-0009, Alcanivorax xenomutants LBF-1-0018, and Stakelama pacifica LBF-1-0031 Yetti, Elvi; Thontowi, Ahmad; Yopi, Yopi
ANNALES BOGORIENSES Vol 21, No 2 (2017): Annales Bogorienses
Publisher : Research Center for Biotechnology - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (646.12 KB) | DOI: 10.14203/ab.v21i2.300

Abstract

Dibenzothiophene (DBT) and its derivatives have been widely used as model organic sulfur compounds in petroleum, included their biodegradation process. The abilities of microorganisms to degrade pollutants are significantly influenced by various factors such as microbial species, nutrients and environmental parameters. In this research, we carried out further study to determine optimal condition for DBT biodegradation regarding with substrate and strains cell concentration by several indigenous marine bacteria from Indonesia. These three isolates were belong to Mauricauda olearia, Alcanivorax xenomutants, and Stakelama pacifica, with homology result 99% each. Optimal dibenzothiophene as substrate reached by all isolates is 100 ppm, while cell concentration or microbial numbers that gave highest growth for all isolates is 20 based on conversion of OD600 nm measurement.  
Polyaromatic Hydrocarbon Degradation and Dioxygenase Gene Detection from Alteromonas alvinellae Bt05 Thontowi, Ahmad; Rahmani, Nanik; Yopi, Yopi
ANNALES BOGORIENSES Vol 17, No 1 (2013): Annales Bogorienses
Publisher : Research Center for Biotechnology - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/75

Abstract

Bt05 is marine bacterium which was isolated from the Jakarta Bay, Indonesia. The aim of this study was to characterize PAHs-degrading property, molecular identification by partial analysis of 16S rRNA gene and to partially analyze dioxygenase gene of Bt05 isolate. Our further study on this isolate revealed that it could degrade three PAHs (phenanthrene, dibenzothiophene, fluorene) between 60%–90% within 11 days at 100 ppm level. This finding indicated the potential of the isolate for bioremediation of PAHs. The isolate was identified as Alteromonas alvinellae by phylogenetic analysis of 16S rRNA gene sequence. Sequence analysis of the PCR product of PAH dioxygenase genes amplified using two primer set (iiDA and ppAH) of the isolate were identified 97% as naphthalene dioxygenase gene (phaAc) and 58% as 1,2-dioxygenase.
Alkane Degradation and Detection of Mono-xygenase Gene from Alcanivorax sp. from Jakarta Bay Thontowi, Ahmad; Yopi, Yopi
ANNALES BOGORIENSES Vol 15, No 2 (2011): Annales Bogorienses
Publisher : Research Center for Biotechnology - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/48

Abstract

Alkanes is a major component of crude oil that can be hydrolized by enzyme alkane monooxygenase from bacteria. Nine oil-degrading bacteria were analyzed their capability to degrade alkanes (pristane and paraffin). The result of growth test on paraffin and pristane were showed that 9 isolates could be devided into two groups. First group (BL09, BL31 and BL45) could degrade both paraffin and pristane, and second group (BL01, BL06, BL44, BL057, BL058 and BL071) preferred to degrade paraffin than pristane. Three isolates (BL09, BL31 and BL45) have activity to decrease paraffin and pristane until less 50% remain. Based on homology analysis of 16S rRNA gene sequences showed that isolates No. BL09, BL31 and BL45 were identified as Alcanivorax sp. and the partial sequences of the alkB gene from those three isolates are showing 66-68% of identity compare with some mono-oxygenase gen from database of genbank.Keywords: biodegradation, alkane, monooxygenase, cloning, alkB
Medium Chain and Long Chain Alkanes Hydroxylase Producing Whole Cell Biocatalyst From Marine Bacteria Thontowi, Ahmad; Yetti, Elvi; Yopi, Yopi
ANNALES BOGORIENSES Vol 22, No 1 (2018): Annales Bogorienses
Publisher : Research Center for Biotechnology - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/ab.v22i1.329

Abstract

Alkanes are  major component of crude oil that could be hydrolyzed by the enzyme of alkane hydroxylase. The are three types of alkane hydroxylase based on the chain length of alkane such as short-chain length/SCL (C2-C4), medium-chain length/MCL (C5-C17), and long-chain length/LCL (C>18). The aims of this study were to characterize and identify alkanes-degrading bacteria from these bacteria. The 30 strains from marine were grown on MCL (Pentane-C5H12, Decane-C10H22, and Pentadecane-C15H32) and LCL (n-Paraffin-C12H19C17 and branch of Pristane-C19H40). The study showed twenty-nine isolates have the ability to degrade alkanes compounds, whereas 14 isolates have grown ability on MCL and LCL medium, 11 isolates have the ability to grow on MCL and n-LCL, 3 isolates have the ability only to grow on MCL medium and 1 isolate has the ability only grow on n-LCL medium. The growth test result indicated that 29 isolates have medium-chain alkane monooxygenase and long-chain alkane hydroxylase. Based on 16S rDNA gene analysis, we obtained twenty nine of oil- degrading bacteria, namely a-proteobacteria (57 %), g-proteobacteria (30 %), Flavobacteria (7 %), Bacilli (3%) and Propionibacteriales (3 %). g-Proteobacteria and a-proteobacteria which seems to play an important role in the alkane biodegradation.
Co-Authors - Yopi A.A. Ketut Agung Cahyawan W ADE ANDRIANI Anja Meryandini Atit Kanti BAMBANG SUNARKO Elvi Yetti, Elvi Endang Kusdiyantini Euis HERMIATI Faradila Ayu, Near Putri Hadi, Sofjan Hadi, Sofjan Hapzi Ali Kholida, Lutfi Nia Kusmiati Kusmiati Laksana, Raden Permana Budi Maemonah, Maemonah N Nurhayati NANIK RAHMANI Ni Nyoman Tri Puspaningsih Ni'mahtuzahroh, Ni'mahtuzahroh NUNIK SULISTINAH Nuzul Farini, Nuzul Oktaviani, Maulida Purkan Purkan, Purkan Purwoko, Agus Putra, Filemon Jalu Nusantara Riksfardini Annisa ERMAWAR Safitriani, Safitriani Safitriani, Safitriani Siti Mardiana Sri Listiyowati Sukma Nuswantara Suryani Suryani Susiana Purwantisari Takashi Watanabe Tanjung, Puspasari Noerwan Tanjung, Puspasari Noerwan Wijaya, Hans YOPI YOPI