AmmoniaWaterNitrate ReductaseWater SupplyFresh WaterNitrate Reductase (NADH)Silver NitrateBody WaterWater PurificationNitrogenWater PollutionWater Pollutants, ChemicalWater PollutantsNitrosomonasUreaNitrate Reductase (NAD(P)H)Quaternary Ammonium CompoundsGlutamate-Ammonia LigaseCarbamoyl-Phosphate Synthase (Ammonia)GlutamineChloratesAmmonium ChlorideHyperammonemiaAnion Transport ProteinsHydrogen-Ion ConcentrationNitrificationNitrogen RadioisotopesOxidation-ReductionWater DeprivationWater MovementsSeawaterDrinkingMolybdenumNitrogen IsotopesNitrogen CompoundsSoilManurePlant RootsWater SofteningOxidoreductasesMolecular Sequence DataBacteriaFertilizersPotassium CompoundsGalliumAmino AcidsIsosorbide DinitrateNitroglycerinDenitrificationGlutamate DehydrogenaseTemperatureNitric OxideGillsGlutaminaseCulture MediaSewageAirPhylogenyAquaporinsRiversHepatic EncephalopathyKineticsAcetylenePentaerythritol TetranitrateRNA, Ribosomal, 16SRumenNitrosomonas europaeaCarbonEnvironmental MonitoringTime FactorsArchaeaSoil MicrobiologyNitric AcidNitrogen FixationEscherichia coliWater WellsWater-Electrolyte BalancePlant LeavesGlutamate SynthaseWaste WaterGeologic SedimentsPhenylalanine Ammonia-LyaseChlorellaOxygenEcosystemGlutamatesCarbon DioxideDNA, RibosomalDNA, BacterialMethylaminesMethionine SulfoximineBacterial ProteinsSequence Analysis, DNABetaproteobacteriaUreaseMutationImmersionAnimal FeedNitrate Reductase (NADPH)Fatty Acids, Volatile