Nitrate ReductaseNitratesNitrogen FixationNitrate ReductasesNitrite ReductasesQuaternary Ammonium CompoundsNitrogenNitrogen CompoundsAnion Transport ProteinsGene Expression Regulation, BacterialNitritesGenes, BacterialRhizobiaceaeOperonBacterial ProteinsCyanobacteriaNitrogenaseCarbonSymbiosisSinorhizobium melilotiPhotosynthesisMolecular Sequence DataRhizobiumPlant RootsAnabaenaIsopteraKlebsiella pneumoniaeAspergillus nidulansChlamydomonas reinhardtiiBase SequenceMutationGlutamate SynthaseGlutamate-Ammonia LigaseCarbon DioxideFixation, OcularNitrogen IsotopesDNA, BacterialAmmoniaPlant LeavesCulture MediaFracture FixationArabidopsisMultigene FamilyAmino Acid SequenceSulfurEscherichia coliFungal ProteinsNitrate Reductase (NADH)PII Nitrogen Regulatory ProteinsComplement Fixation TestsTissue FixationSilver NitrateNitrogen CycleGlutamate DehydrogenaseRibulose-Bisphosphate CarboxylaseTrans-ActivatorsAutotrophic ProcessesAdenosine PhosphosulfateSulfatesNitrogen DioxidePromoter Regions, GeneticTranscription FactorsBiomassBlood Urea NitrogenFertilizersSequence AlignmentSulfate AdenylyltransferaseCarbohydrate MetabolismBone ScrewsGlutamate Synthase (NADH)Oxidoreductases Acting on Sulfur Group DonorsChlorophyllPlant TranspirationKetoglutaric AcidsOxidation-ReductionReactive Nitrogen SpeciesPhylogenyLightCarbon IsotopesAmino AcidsGene Expression Regulation, PlantAcetyleneGlutamineBone PlatesAchromobacterSoilOxidoreductasesPlant ShootsChloratesSeawaterPlantsPlant ProteinsNitrogen OxidesPotassium CompoundsMetabolic Networks and PathwaysExternal FixatorsFixativesMethanolMolybdenumPlants, Genetically Modified