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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology
ANJA MERYANDINI
Dept. of Biology, Faculty of Science and Mathematics, Bogor Agricultural University, Bogor, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary

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CHARACTERIZATION OF THREE BENZOATE DEGRADING ANOXYGENIC PHOTOSYNTHETIC BACTERIA ISOLATED FROM THE ENVIRONMENT DWI SURYANTO; ANTONIUS SUWANTO; ANJA MERYANDINI
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 17 (2001)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (152.215 KB) | DOI: 10.11598/btb.2001.0.17.166

Abstract

Three  anoxygenic photosynthetic bacteria, DS-1, DS-4 and Cas-13, have been examinated  for  themorphological and physiological  properties. All strains were rod-shape cells with  a swollen terminal  endGram  negative, motile, non-halophilic, non-alkalophilic  and non-acidophilic,  and capable of utilizinbenzoate aerobically and photo-anaerobically. Sequence analysis of part of 16S rRNA genes showed that DS1 and Cas-13 were closely related to Rhodopseudomonas palustris Strain 7 with a similarity of 97%, whereaDS-4 may not be closely related to the former two strains with a similarity of 78% based on the constructephylogenic  tree. Spectral analysis indicated that the three  bacteria  had  bacteriochlorophyl  a  and normaspirilloxanthin series. Growth in medium enriched with vitamin and supplemented with benzoate as their sole C-sources wabetter than in medium without vitamin. Benzoate degradation in medium with vitamin was accelerated. Thability  to grow on benzoate without added vitamins indicated  that  the bacteria were able to synthesize  theown vitamins. Key words: anoxygenic photosynthetic bacteria/ benzoate degradation/ 16S rRNA gene.
CHARACTERIZATION OF XYLANASE FROM A XYLANOLYTIC- THERMOPHILIC BACTERIUM ISOLATED FROM GUNUNG PANCAR HOT SPRING, WEST JAVA ANTONIUS SUWANTO; DWI SURYANTO; ANJA MERYANDINI
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 17 (2001)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2001.0.17.167

Abstract

A xylanolytic-thermophilic bacterium (IT-08) was isolated from Gunung Pancar Hot Spring after two days of enrichment in Modified Thermus Medium (MTM) supplemented with 0.5% oat spelt xylan. 16S-rRNA sequence analysis indicated that IT-08 resembles Bacillus thermoleovorans, a species of thermophilic bacteria. When grown on xylan containing media, IT-08 produces a thermoactive xylanase. Xylanase from IT-08 was active at temperatures between 40 and 100°C, at pH values between 4.0 and 9.0 with optimum values obtained at 80°C and pH 6.0, respectively. SDS-PAGE and zymogram analysis demonstrated that a crude xylanase complex of IT-08 comprised two active bands with molecular masses of 78 and 60 kDa. Keywords: xylanase / xylanolytic-thermophilic bacteria
Co-Authors Antonius Suwanto DWI SURYANTO