Nicholas, D J Repression, derepression and activation of nitrogenase in Azotobacter vinelandii. [electronic resource] - Australian journal of biological sciences Mar 1976 - 147-61 p. digital Publication Type: Journal Article ISSN: 0004-9417 Subjects--Topical Terms: Ammonium ChlorideAzotobacter--enzymologyEnzyme ActivationEnzyme RepressionIronIsoenzymes--isolation & purificationNitrogenase--isolation & purification