Oxygen is prevalent in the atmosphere as gaseous diatomic
oxygen (O2), in the hydrosphere as water (H2O), and the geosphere
as oxides of various metal and metalloid elements. Oxygen
is prevalent in biological molecules and commercial compounds.
Examples of the latter include phenol,
For more information:
Medline for oxygen metabolism AND bacteria
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oxygen concentrations for Azotobacter vinelandii and Escherichia
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