Abstract
The nitrogen-fixing, grass-associated bacterium Azoarcus sp. BH72 was characterized with respect to its terminal oxidases. Inhibitory respiratory analysis revealed the presence of at least one cytochrome c oxidase and one quinol oxidase. The cytochrome c oxidase was preferably used by the cells under aerobic, whereas the quinol oxidase seemed to be dominant under microaerobic, nitrogen-fixing conditions. Differential spectroscopy and heme analysis of the membrane preparations indicated that the cytochrome c oxidase is probably of the cb type. © 1997 Federation of European Biochemical Societies.
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