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KMID : 0545119940040010036
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Journal of Microbiology and Biotechnology
1994 Volume.4 No. 1 p.36 ~ p.40
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Isolation and Characterization of an Extremely Thermophilic Sulfur-metabolizing Bacterium from a Deep-sea Hydrothermal Vent System
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KWAK, YI-SEONG
KOBAYASHI, TETSUO/AKIBA, TERUHIKO
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Abstract
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A water sample was taken from a black smoker chimney of a deep-sea hydrothermal vent by using an unmanned submersible "Dolphin 3K". The temperature of the hydrothermal fluid from the black smoker was 276℃. After isolation by repeated serial dilutions, An extremely thermophilic bacterial strain was selected. The strain designated as DT1331, was an anaerobic, non-motile, coccoid shaped bacterium with about 0.5 to 1.0 ㎛ in diameter. The strain DT1331 could grow up to 93℃, but the optimum temperature of this strain was 80℃. The growth occurred in the pH range of 4.5 to 8.5 and the optimum pH was 6.0. The strain DT1331 required 1% to 5% NaCl for growth and cell lysis was observed below 1% NaCl concentration. The bacterium could grow on polypeptides such as tryptone, peptone, soytone and on proteins such as casein or gelatin. However, no growth was observed on single amino acids, sugar and organic acids. Hydrogen gas was detected slightly during growth. This bacterium obligately required elemental sulfur and hydrogen sulfide gas was produced during growth.
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