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Applied and Environmental Microbiology
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General Microbial Ecology

Extremely Barophilic Bacteria Isolated from the Mariana Trench, Challenger Deep, at a Depth of 11,000 Meters

Chiaki Kato, Lina Li, Yuichi Nogi, Yuka Nakamura, Jin Tamaoka, Koki Horikoshi
Chiaki Kato
The Deep Star Group, Japan Marine Science and Technology Center Yokosuka 237, Japan
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Lina Li
The Deep Star Group, Japan Marine Science and Technology Center Yokosuka 237, Japan
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Yuichi Nogi
The Deep Star Group, Japan Marine Science and Technology Center Yokosuka 237, Japan
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Yuka Nakamura
The Deep Star Group, Japan Marine Science and Technology Center Yokosuka 237, Japan
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Jin Tamaoka
The Deep Star Group, Japan Marine Science and Technology Center Yokosuka 237, Japan
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Koki Horikoshi
The Deep Star Group, Japan Marine Science and Technology Center Yokosuka 237, Japan
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ABSTRACT

Two strains of obligately barophilic bacteria were isolated from a sample of the world’s deepest sediment, which was obtained by the unmanned deep-sea submersible Kaiko in the Mariana Trench, Challenger Deep, at a depth of 10,898 m. From the results of phylogenetic analysis based on 16S rRNA gene sequences, DNA-DNA relatedness study, and analysis of fatty acid composition, the first strain (DB21MT-2) appears to be most highly similar to Shewanella benthica and close relatives, and the second strain (DB21MT-5) appears to be closely related to the genus Moritella. The optimal pressure conditions for growth of these isolates were 70 MPa for strain DB21MT-2 and 80 MPa for strain DB21MT-5, and no growth was detected at pressures of less than 50 MPa with either strain. This is the first evidence of the existence of an extreme-barophile bacterium of the genus Moritella isolated from the deep-sea environment.

  • Copyright © 1998 American Society for Microbiology
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Extremely Barophilic Bacteria Isolated from the Mariana Trench, Challenger Deep, at a Depth of 11,000 Meters
Chiaki Kato, Lina Li, Yuichi Nogi, Yuka Nakamura, Jin Tamaoka, Koki Horikoshi
Applied and Environmental Microbiology Apr 1998, 64 (4) 1510-1513; DOI:

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Extremely Barophilic Bacteria Isolated from the Mariana Trench, Challenger Deep, at a Depth of 11,000 Meters
Chiaki Kato, Lina Li, Yuichi Nogi, Yuka Nakamura, Jin Tamaoka, Koki Horikoshi
Applied and Environmental Microbiology Apr 1998, 64 (4) 1510-1513; DOI:
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