Nitrogen FixationNitrogen IsotopesNitrogen CompoundsNitrogen CycleBlood Urea NitrogenNitrogen DioxideReactive Nitrogen SpeciesNitrogen OxidesPII Nitrogen Regulatory ProteinsCarbonAmmoniaNitratesFertilizersQuaternary Ammonium CompoundsGlutamate-Ammonia LigaseUreaSoilNitrogen Mustard CompoundsNitrogenaseSymbiosisAmino AcidsBiomassPlant RootsGlutamineAcetylenePlant LeavesDigestionBacterial ProteinsMarrubiumGlutamate SynthaseGene Expression Regulation, BacterialAllantoinNitritesPhosphorusCulture MediaMolecular Sequence DataRoot Nodules, PlantNitrate ReductaseDenitrificationPoaceaePhotosynthesisEcosystemAnimal FeedTortureOxidation-ReductionMedicago sativaKetoglutaric AcidsBacteriaFermentationSoil MicrobiologyNutritional RequirementsRhizobiumGlutamate DehydrogenaseGATA Transcription FactorsSinorhizobium melilotiSoybeansAir PollutantsCarbon DioxideRumenMutationGene Expression Regulation, FungalTreesAgricultureSulfurPlant ShootsNitrificationHydrogen-Ion ConcentrationManureFabaceaeParenteral Nutrition, TotalFreezingAtmosphereNitrate ReductasesAir PollutionGlutamate Synthase (NADH)Body WeightPlantsDietBase SequenceGasesZea maysAmino Acids, EssentialParenteral NutritionEnvironmental MonitoringPanicumAmmonium ChlorideAzotobacterOxygenTime FactorsOxidoreductasesNitric OxideNitrous OxideModels, BiologicalPlant ProteinsSeawaterCrops, AgriculturalOzoneFecesSaccharomyces cerevisiaeGlutamate Dehydrogenase (NADP+)