nitrogenase activity ( acetylene reduction assay ) in the nodulated non-leguminous angiosperm alnus glutinosa is inhibited within minutes when plants are exposed to a gas phase containing 90 % oxygen on returning the plants to air , nitrogenase activity recovers within a few hours , both in the presence of cycloheximide , which inhibits protein synthesis on 80 s ( eukaryotic ) ribosomes , and in the absence of inhibitor .
C0597295
protein synthesis
C0035553
ribosomes