Nitrate ReductaseNitrogen FixationNitrogen CompoundsNitrogen IsotopesNitrate Reductase (NADH)Silver NitrateNitrogen CycleNitrogen DioxideBlood Urea NitrogenReactive Nitrogen SpeciesQuaternary Ammonium CompoundsFertilizersNitrogen OxidesAmmoniaNitrate Reductase (NAD(P)H)PII Nitrogen Regulatory ProteinsCarbonAnion Transport ProteinsChloratesPlant RootsSoilNitratesMolybdenumGlutamate-Ammonia LigaseDenitrificationNitrogenNitric OxidePotassium CompoundsOxidation-ReductionMolecular Sequence DataUreaGalliumGene Expression Regulation, BacterialIsosorbide DinitrateNitroglycerinBiomassBacterial ProteinsCulture MediaNitrogenasePlant LeavesAmino AcidsSymbiosisPentaerythritol TetranitrateNitrogen Mustard CompoundsOxidoreductasesAmmonium CompoundsCyanobacteriaAcetyleneMutationGlutaminePlant ShootsNitric AcidGenes, BacterialNitrous OxideSoil MicrobiologyWater Pollutants, ChemicalBacteriaHydrogen-Ion ConcentrationEscherichia coliChlorellaPhylogenyOxygenOperonHydroponicsNitrate Reductase (NADPH)DNA, BacterialSulfurEcosystemAgricultureSeawaterGlutamate SynthaseDrug TolerancePhotosynthesisPteridinesRNA, Ribosomal, 16SRoot Nodules, PlantPhosphorusWater Pollution, ChemicalEnzyme RepressionKineticsPlant ProteinsFresh WaterTungsten CompoundsGene Expression Regulation, PlantDigestionSequence Analysis, DNAFermentationPoaceaeCarbon DioxideArginineBiodegradation, EnvironmentalPlantsEnvironmental MonitoringGeologic SedimentsTime FactorsArabidopsisAmino Acid SequenceAllantoinZea maysManure