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- W2127642917 abstract "When photosynthetic bacterium Rubrivivax gelatinosus CBS-2 was cultured under an atmosphere containing CO, a unique water-gas shift pathway is quickly induced. This bacterium is able to convert CO (and H2O) into H2 (and CO2). The terminal step involves a CO-linked hydrogenase. This hydrogenase is unique in its tolerance to O2, with a half- life of 21 hours when stirred in full air. By measuring H2-D2O (H-D) exchange reaction with a capillary mass spectrometer, we determined that this hydrogenase is also partially functional in an atmosphere containing up to 3% O2, carrying out the H-D exchange reaction at a linear rate throughout the 10-min measurement. This level of tolerance renders this hydrogenase suitable for scale-up application in which O2 is present simultaneously. In order to sustain long-term H2 production, we need to further understand the components involved and rate-limiting steps of the bacterial water-gas shift pathway. To achieve this goal, we performed mutant isolation and obtained seven mutants with enhanced CO shift rates, which are worthy of further investigations. Using a different approach to elucidate the components involved in CO shift pathway, we determined that once photo-reduced, a soluble ferredoxin of both a bacterial and of a blue-green algal source can link to the bacterial hydrogenase from CBS-2 to support H2 production. This finding strongly suggests that a ferredoxin could be involved in mediating H2 production from CO oxidation in Rx gelatinosus CBS-2." @default.
- W2127642917 created "2016-06-24" @default.
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- W2127642917 date "2001-01-01" @default.
- W2127642917 modified "2023-09-27" @default.
- W2127642917 title "BIOLOGICAL H2 FROM FUEL GASES AND FROM WATER" @default.
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