A Denitrifying Activity in an Aerobic Photosynthetic Bacterium, Erythrobacter sp. Strain OCh 114 |
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Authors: | Shioi Yuzo; Doi Michio; Arata Hiroyuki; Takamiya Ken-ichiro |
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Institution: | 1Division of Biology, Miyazaki Medical College Miyazaki 889-16, Japan
2Department of Biology, Faculty of Science, Kyushu University 33 Fukuoka 812, Japan |
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Abstract: | An aerobic photosynthetic bacterium, Erythrobacter sp. strainOCh 114, was capable of growth under anaerobic conditions inthe dark with nitrate as a terminal electron acceptor. The optimalnitrate concentration was about 6 mM for anaerobic growth, althougha wide range of concentrations from 1 to 400 mM were effective.A large amount of N2O gas was released during this anaerobicgrowth, indicating a denitrifying activity in this bacterium.Light had no stimulating or inhibiting effect on the rates ofanaerobic growth and gas release. The enzymes responsible forthe denitrifying activity, dissimilatory nitrate and nitritereductases, were present in aerobically grown cells. (Received February 19, 1988; Accepted May 16, 1988) |
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