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Growth and flocculation of a marine photosynthetic bacterium Rhodovulum sp

A marine photosynthetic bacterium (PS88), identified as Rhodovulum sp., with flocculating ability was isolated from the sea sediment mud of a shrimp cultivation farm in Thailand. This bacterium flocculated in glutamate/malate medium during aerobic dark or anaerobic light cultivation. The flocculatin...

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Bibliographic Details
Published in:Applied microbiology and biotechnology 1998, Vol.50 (6), p.682-691
Main Authors: WATANABE, M, SASAKI, K, NAKASHIMADA, Y, KAKIZONO, T, NOPARATNARAPORN, N, NISHIO, N
Format: Article
Language:English
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Summary:A marine photosynthetic bacterium (PS88), identified as Rhodovulum sp., with flocculating ability was isolated from the sea sediment mud of a shrimp cultivation farm in Thailand. This bacterium flocculated in glutamate/malate medium during aerobic dark or anaerobic light cultivation. The flocculating ability was enhanced with the increase of NaCl concentration to 6% (w/v). When PS88 was grown in glutamate/malate medium containing 3.5% NaCl, protein, RNA and DNA were produced exocellularly and there was flocculation. The yields of DNA, RNA and protein were 8.3, 62.5 and 48.5 mg/g dry cell, respectively. The flocculated cells were deflocculated by treatment with a nucleolytic enzyme such as RNase or DNase, while amylase, protease, trypsin, cellulase and pectinase had no deflocculating effect. These results suggest that the exocellular nucleic acids are active in flocculation.
ISSN:0175-7598
1432-0614
DOI:10.1007/s002530051351