NitrogenaseNitrogen FixationMolybdoferredoxinAcetyleneAzotobacterAzotobacter vinelandiiMolybdenumGenes, BacterialGenesDinitrogenase ReductaseKlebsiella pneumoniaeOxidoreductasesRhodospirillum rubrumFerredoxinsBase SequenceNitrogenBacterial ProteinsCloning, MolecularMolecular Sequence DataRhodobacter capsulatusDithioniteEscherichia coliMutationHydrogenAmino Acid SequenceEthaneAmmoniaOperonPlasmidsCyanobacteriaTricarboxylic AcidsAzospirillum brasilenseDNA, BacterialGenes, RegulatorMetalloproteins