Abstract
The terminal respiratory chain of the aerobic nitrogen-fixing bacterium Azotobacter vinelandii was investigated by photochemical action spectra. Terminal cytochrome oxidases a2, a1 and o were confirmed as being the terminal oxidases for the physiological substrates NADH and L-malate. TMPD/ascorbate, not giving coupled phosphorylation uses cytochrome a1 and possibly an o type. DCPIP/ascorbate, giving coupled phosphorylation uses neither cytochrome a1 nor a2.
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