NitrogenaseVanadiumAzotobacterEthaneVanadium CompoundsMetalloproteinsNitrogen FixationMolybdoferredoxinAcetyleneAzotobacter vinelandiiMolybdenumDinitrogenase ReductaseKlebsiella pneumoniaeRhodospirillum rubrumOxidoreductasesFerredoxinsAmmoniaNitrogenDithioniteOxidation-ReductionHydrogenRhodobacter capsulatusPII Nitrogen Regulatory ProteinsNitrogen IsotopesQuaternary Ammonium CompoundsChloride PeroxidaseVanadatesCyanobacteriaElectron Spin Resonance SpectroscopyBacterial ProteinsNitrogen CompoundsTungstenGenes, BacterialTricarboxylic AcidsNitrogen CycleBlood Urea NitrogenMethionine SulfoximineNitrogen DioxideAzospirillum brasilenseFlavodoxinGlutamate-Ammonia LigaseArgonIronRhizobiumUrochordataRhodopseudomonasKineticsGluconacetobacterSymbiosisReactive Nitrogen SpeciesClostridiumMolecular Sequence DataAnaerobiosisNitratesAmmonium ChloridePhenothiazinesSpectrophotometry, AtomicNonheme Iron ProteinsGene Expression Regulation, BacterialOxygenAnabaenaAzoarcusAnabaena variabilisElectron TransportCarbonImides