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The effect of oxygen on nitrogen fixation byAzotobacter

Authors
Journal
Biochimica et Biophysica Acta
0006-3002
Publisher
Elsevier
Publication Date
Volume
38
Identifiers
DOI: 10.1016/0006-3002(60)91236-1

Abstract

Abstract Measurements of nitrogen fixation in Azotobacter vinelandii plotted on a Lineweaver-Burk plot at oxygen concentrations of 10 and 20% indicate a competitive inhibition of nitrogen fixation by oxygen. At higher oxygen concentrations there was an additional inhibition of respiration and growth. The Michaelis constants for nitrogen fixation were 0.0107 and 0.0229 at 10 and 20% oxygen respectively. It is suggested that oxygen and nitrogen may compete as terminal hydrogen acceptors, nitrogen fixation thus being a form of respiration.

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