NitrogenSweatLarreaNitrogen IsotopesDietary ProteinsMethylhistidinesNutritional RequirementsQuaternary Ammonium CompoundsAmmoniaFecesNitrogen FixationAmino AcidsEnergy IntakeBody WeightEnergy MetabolismNitrogen CompoundsNitrogen CycleBlood Urea NitrogenNitrogen DioxideReactive Nitrogen SpeciesNitrogen OxidesPII Nitrogen Regulatory ProteinsCarbonNitratesFertilizersGlutamate-Ammonia LigaseUreaSoilNitrogen Mustard CompoundsNitrogenaseSymbiosisBiomassPlant RootsGlutamineAcetylenePlant LeavesDigestionBacterial ProteinsAmmonium CompoundsGlutamate SynthaseGene Expression Regulation, BacterialAllantoinNitritesPhosphorusCulture MediaMolecular Sequence DataRoot Nodules, PlantNitrate ReductaseDenitrificationPoaceaePhotosynthesisCyanobacteriaEcosystemAnimal FeedGenes, BacterialOxidation-ReductionMedicago sativaKetoglutaric Acids