Nitrogen FixationAmmoniaNitrogen IsotopesNitrogen CompoundsNitrogen CycleBlood Urea NitrogenNitrogen DioxideGlutamate-Ammonia LigaseUreaReactive Nitrogen SpeciesGlutamineNitrosomonasPII Nitrogen Regulatory ProteinsNitrogen OxidesCarbamoyl-Phosphate Synthase (Ammonia)Quaternary Ammonium CompoundsAmmonium ChlorideNitratesNitrificationNitrogenCarbonHyperammonemiaAmino AcidsFertilizers