HydrogenHydrogen BondingHydrogen PeroxideHydrogen SulfideNitrogen FixationNitrogen IsotopesNitrogen CompoundsNitrogen CycleBlood Urea NitrogenNitrogen DioxideReactive Nitrogen SpeciesNitrogen OxidesPII Nitrogen Regulatory ProteinsCarbonHydrogen CyanideNitratesOxidation-ReductionAmmoniaModels, MolecularFertilizersQuaternary Ammonium CompoundsOxidantsCatalaseMolecular Sequence DataUreaGlutamate-Ammonia LigaseHydrogen-Ion ConcentrationAmino AcidsNitrogenaseDeuterium Exchange MeasurementWaterKineticsBacterial ProteinsSoilCrystallography, X-RayNitrogen Mustard CompoundsAcetyleneSymbiosisMolecular StructureProtein ConformationBiomassMagnetic Resonance SpectroscopyOxygenCystathionine gamma-LyaseModels, ChemicalGasesHydrogenasePeroxidasesAmino Acid SequenceReactive Oxygen SpeciesGlutamineGene Expression Regulation, BacterialBinding SitesPlant RootsPlant LeavesCatalysisMutationTemperatureCulture MediaFermentationMethaneSulfidesOxidoreductasesSulfurAnaerobiosisThermodynamicsDigestionMolecular ConformationEscherichia coliNitritesPhotosynthesisProtonsBacteriaCarbon DioxideHydroxyl RadicalBase SequenceBreath TestsTime FactorsCyanobacteriaGenes, BacterialProtein Structure, SecondaryStereoisomerismPhosphorusElectron Spin Resonance SpectroscopyAmmonium CompoundsGlutamate SynthaseAllantoinFree RadicalsSuperoxide DismutaseRoot Nodules, PlantMass SpectrometryProtein BindingCattleAntioxidantsNitrate ReductaseStructure-Activity RelationshipEcosystemHydroxidesAnimal FeedPoaceae