Abstract
Nitrogenase (acetylene reducing) activity, nitrogenase-mediated hydrogen evolution and hydrogenase-catalysed hydrogen uptake activity was studied in intact Azolla fronds. Nitrogenase activity was significantly influenced by various physiological parameters. When incubated under light, the rate of H 2 evolved by the fronds under anaerobic conditions was significantly higher than that under aerobic condition. H 2 uptake was significantly inhibited by both acetylene and carbon monoxide incubations.
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