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• W2057155384 abstract "The objective of this study was to analyse in vivo the effect of oxygen on the nitrogenase of Bacillus polymyxa. The culture technique employed in this study prevented spore formation by B. polymyxa during the entire period of exposure to acetylene. Under these conditions the acetylene-reduction assay allowed quantification of nitrogenase activity over long incubation periods (44 h). Nitrogenase activity was highest in cells harvested in the late logarithmic phase. At [Formula: see text] of 0.19 and 0.37 kPa, acetylene reduction was inhibited by 80 and 100%, respectively. This switch-off effect could be reversed through oxygen exhaustion, either by flushing the culture with N 2 or by cellular respiration, suggesting a respiratory protection mechanism for the nitrogenase complex in B. polymyxa. Oxygen consumption measured by a closed-chamber respirometer showed a linear increase up to a [Formula: see text] of 0.2 kPa. Above 0.3 kPa a saturation in oxygen consumption was observed. Exposure to high oxygen pressures resulted in an irreversible loss of nitrogenase activity. The oxygen inhibition pattern was shown to be similar to that in other microaerophilic and anaerobic nitrogen-fixing microorganisms. Key words: Bacillus polymyxa, nitrogenase, oxygen inhibition, reversibility, respiration." @default.
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• W2057155384 date "1991-10-01" @default.
• W2057155384 modified "2023-09-27" @default.
• W2057155384 title "Reversibility of oxygen switch-off effect on Bacillus polymyxa nitrogenase" @default.
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• W2057155384 doi "https://doi.org/10.1139/m91-133" @default.
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