Isolation and Characterization of CO_2-Fixing Hydrogen-Oxidizing Marine Bacteria

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概要

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• A Co_2-fixing bacterium, strain YN-1, that can fix Co_2 under chemoautotrophic conditions but not photoautotrophic conditions was isolated from seawater. Identification of the isolate was carried out using biochemical tests and 16S rDNA sequence analysis, and its characteristics were investigated. From the results of partial 16S rDNA sequence analysis, strain YN-1 showed low identity with previously reported hydrogen-oxidizing bacteria, Hydrogenovibrio marinus MH-110 and Hydrogenophilus thermoluteolus. This result indicates that strain YN-1 may be a new hydrogen-oxidizing marine bacterium. Strain YN-1 showed considerable Co_2 fixation ability during continuous cultivation even at high CO_2 concentration. Strain YN-1 used H_2 and CO_2 as energy and carbon sources, respectively. Growth characteristics were examined in batch and continuous cultivation with a view to improving the CO_2 fixation rate. The results showed that CO_2 fixation occurred in the absence of a light source and that the strain exhibited good growth at high CO_2 concentration(40%). On the other hand, the dry cell weight was 13.4 g/l following continuous cultivation for 76 h in 10% CO_2(0.1 l/min), and at that time the amount of fixed CO_2 was 18.08 g CO_2/l. This indicates that strain YN-1 can efficiently fix CO_2 even at high CO_2 concentrations, which would allow its application to the removal of industrially discharged CO_2.

• 社団法人日本生物工学会の論文
• 2001-05-25

著者

• IGARASHI Yasuo

  Department of Biotechnology, The University of Tokyo

• Igarashi Yasuo

  Department Of Biotechnology University Of Tokyo

• KIM Seongjun

  Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University

• Igarashi Yasuo

  Department Of Agricultural Chemistry The University Of Tokyo

• Kim Seongjun

  Department Of Adaptive Machine Systems Graduate School Of Engineering Osaka University

• Kim Seongjun

  Department Of Environmental Engineering Chonnam National University

• BAE SANGOK

  Department of Environmental Engineering, Chonnam National University

• KWAK KYUNGOH

  Department of Environmental Engineering, Chonnam National University

• CHUNG SEONYONG

  Department of Environmental Engineering, Chonnam National University

• Bae Sangok

  Department Of Environmental Engineering Chonnam National University

• Kwak Kyungoh

  Department Of Environmental Engineering Chonnam National University

• Chung S

  Department Of Environmental Engineering Chonnam National University

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