Nitric Oxide SynthaseNitrogen FixationNitrogen OxidesNitrogen IsotopesNitrogen CompoundsNitric Oxide Synthase Type IINitrogen CycleBlood Urea NitrogenNitrogen DioxideOxidesReactive Nitrogen SpeciesNitric Oxide Synthase Type IIINitratesNitric Oxide Synthase Type IPII Nitrogen Regulatory ProteinsNitritesZinc OxideArginineCarbonAmmoniaFertilizersNG-Nitroarginine Methyl EsterQuaternary Ammonium Compoundsomega-N-MethylarginineGlutamate-Ammonia LigaseEnzyme InhibitorsUreaAmino Acid OxidoreductasesSoilNitrogen Mustard CompoundsNitrogenaseNitroso CompoundsS-Nitroso-N-AcetylpenicillamineAmino AcidsSymbiosisCyclic GMPOxidation-ReductionBiomassNitroprussidePenicillaminePlant RootsEndothelium, VascularGlutamineMolsidominePlant LeavesPeroxynitrous AcidRats, Sprague-DawleyFerrosoferric OxideMolecular Sequence DataBacterial ProteinsCitrullineS-NitrosoglutathioneVasodilationOxygenDenitrificationTime FactorsMagnesium OxideAcetyleneDigestionDose-Response Relationship, DrugFerric CompoundsGene Expression Regulation, BacterialNitrate ReductaseCulture MediaAllantoinRats, WistarCells, CulturedS-NitrosothiolsAmmonium CompoundsGlutamate SynthaseGuanylate CyclasePhosphorusRoot Nodules, PlantEnzyme InductionVasodilator AgentsPoaceaeAnimal FeedReactive Oxygen SpeciesKineticsCarbon DioxidePhotosynthesisAluminum OxideDeuterium OxideOxidoreductasesCattleEcosystemGasesCyanobacteriaGenes, BacterialOxidative StressAir PollutantsHydrogen-Ion ConcentrationBacteriaLipopolysaccharidesRNA, MessengerMutationBreath TestsBiopterinFree Radical ScavengersModels, Biological