PHENOMENA AND PROCESSES      Chemical Phenomena [G02]      Chemical Phenomena           Biochemical Phenomena [G02.111]           Biochemical Phenomena                Acid Base Equilibrium [G02.111.007]                Acid Base Equilibrium                Acylation [G02.111.012] +                Acylation +                Aerobiosis [G02.111.017]                Aerobiosis                Agglutination [G02.111.026] +                Agglutination +                Alkylation [G02.111.035] +                Alkylation +                Allosteric Regulation [G02.111.044]                Allosteric Regulation                Amination [G02.111.053]                Amination                Anaerobiosis [G02.111.062]                Anaerobiosis                Autotrophic Processes [G02.111.071] +                Autotrophic Processes +                Base Composition [G02.111.080]                Base Composition                Binding, Competitive [G02.111.084]                Binding, Competitive                Biocatalysis [G02.111.086]                Biocatalysis                Biomineralization [G02.111.092]                Biomineralization                Biosynthetic Pathways [G02.111.098]                Biosynthetic Pathways                Biotinylation [G02.111.109]                Biotinylation                Body Composition [G02.111.130] +                Body Composition +                Brain Chemistry [G02.111.150]                Brain Chemistry                Carbohydrate Metabolism [G02.111.158] +                Carbohydrate Metabolism +                Citric Acid Cycle [G02.111.165]                Citric Acid Cycle                Cyclization [G02.111.180]                Cyclization                Dealkylation [G02.111.188] +                Dealkylation +                Deamination [G02.111.192]                Deamination                Decarboxylation [G02.111.195]                Decarboxylation                DNA Cleavage [G02.111.210]                DNA Cleavage                DNA Methylation [G02.111.218]                DNA Methylation                DNA Repair [G02.111.222] +                DNA Repair +                DNA Replication [G02.111.225] +                DNA Replication +                Down Regulation [G02.111.240]                Down Regulation                Electron Transport [G02.111.248]                Electron Transport                Energy Transfer [G02.111.255] +                Energy Transfer +                Enzyme Activation [G02.111.263]                Enzyme Activation                Esterification [G02.111.270]                Esterification                Halogenation [G02.111.323]                Halogenation                Heterotrophic Processes [G02.111.375]                Heterotrophic Processes                Hydrogenation [G02.111.380]                Hydrogenation                Hydroxylation [G02.111.385]                Hydroxylation                Kinetics [G02.111.490]                Kinetics                Lipid Peroxidation [G02.111.515]                Lipid Peroxidation                Lipogenesis [G02.111.528]                Lipogenesis                Lipolysis [G02.111.534]                Lipolysis                Lipoylation [G02.111.540]                Lipoylation                Membrane Fluidity [G02.111.550]                Membrane Fluidity                Molecular Mimicry [G02.111.560]                Molecular Mimicry                Molecular Structure [G02.111.570] +                Molecular Structure +                Nitrogen Cycle [G02.111.587] +                Nitrogen Cycle +                     Denitrification [G02.111.587.250]                     Denitrification                     Nitrification [G02.111.587.500]                     Nitrification                     Nitrogen Fixation [G02.111.587.750]                     Nitrogen Fixation                Nitrosation [G02.111.595]                Nitrosation                Nucleic Acid Denaturation [G02.111.603]                Nucleic Acid Denaturation                Nucleic Acid Hybridization [G02.111.611] +                Nucleic Acid Hybridization +                Nucleic Acid Renaturation [G02.111.619]                Nucleic Acid Renaturation                Osmoregulation [G02.111.635] +                Osmoregulation +                Osmosis [G02.111.655] +                Osmosis +                Peptide Biosynthesis [G02.111.660] +                Peptide Biosynthesis +                Phosphorylation [G02.111.665] +                Phosphorylation +                Phototrophic Processes [G02.111.669] +                Phototrophic Processes +                Prenylation [G02.111.672] +                Prenylation +                Protein Aggregation, Pathological [G02.111.675]                Protein Aggregation, Pathological                Protein Binding [G02.111.679]                Protein Binding                Protein Folding [G02.111.688] +                Protein Folding +                Protein Modification, Translational [G02.111.691] +                Protein Modification, Translational +                Protein Multimerization [G02.111.694]                Protein Multimerization                Protein Stability [G02.111.700] +                Protein Stability +                Proteolysis [G02.111.720]                Proteolysis                Proteostasis [G02.111.730]                Proteostasis                RNA Cleavage [G02.111.740]                RNA Cleavage                RNA Folding [G02.111.750]                RNA Folding                RNA Processing, Post Transcriptional [G02.111.760] +                RNA Processing, Post Transcriptional +                RNA Stability [G02.111.780] +                RNA Stability +                Sequence Homology [G02.111.810] +                Sequence Homology +                Signal Transduction [G02.111.820] +                Signal Transduction +                Structure Activity Relationship [G02.111.830] +                Structure Activity Relationship +                Substrate Cycling [G02.111.833]                Substrate Cycling                Substrate Specificity [G02.111.835]                Substrate Specificity                Transcription, Genetic [G02.111.873] +                Transcription, Genetic +                Up Regulation [G02.111.905]                Up Regulation PHENOMENA AND PROCESSES      Chemical Phenomena [G02]      Chemical Phenomena           Organic Chemistry Phenomena [G02.607]           Organic Chemistry Phenomena                Acylation [G02.607.063] +                Acylation +                Alkylation [G02.607.094] +                Alkylation +                Amination [G02.607.110]                Amination                Carbon Cycle [G02.607.125] +                Carbon Cycle +                Cyclization [G02.607.133]                Cyclization                Dealkylation [G02.607.141] +                Dealkylation +                Deamination [G02.607.157]                Deamination                Decarboxylation [G02.607.188]                Decarboxylation                Esterification [G02.607.250]                Esterification                Glycosylation [G02.607.299]                Glycosylation                Hydrogenation [G02.607.324]                Hydrogenation                Hydroxylation [G02.607.348]                Hydroxylation                Isomerism [G02.607.445] +                Isomerism +                Maillard Reaction [G02.607.522]                Maillard Reaction                Nitrogen Cycle [G02.607.560] +                Nitrogen Cycle +                     Denitrification [G02.607.560.250]                     Denitrification                     Nitrification [G02.607.560.500]                     Nitrification                     Nitrogen Fixation [G02.607.560.750]                     Nitrogen Fixation                Nitrosation [G02.607.598]                Nitrosation                Oxidative Coupling [G02.607.765]                Oxidative Coupling                Phosphorylation [G02.607.780]                Phosphorylation PHENOMENA AND PROCESSES      Biological Phenomena [G16]      Biological Phenomena           Ecological and Environmental Phenomena [G16.500]           Ecological and Environmental Phenomena                Air Ionization [G16.500.050]                Air Ionization                Biofouling [G16.500.100]                Biofouling                Carbon Cycle [G16.500.150] +                Carbon Cycle +                Climatic Processes [G16.500.175] +                Climatic Processes +                Cosmic Radiation [G16.500.200]                Cosmic Radiation                Environment [G16.500.275] +                Environment +                Eutrophication [G16.500.285] +                Eutrophication +                Geologic Sediments [G16.500.320] +                Geologic Sediments +                Meteorological Concepts [G16.500.750] +                Meteorological Concepts +                Nitrogen Cycle [G16.500.768] +                Nitrogen Cycle +                     Denitrification [G16.500.768.249]                     Denitrification                     Nitrification [G16.500.768.500]                     Nitrification                     Nitrogen Fixation [G16.500.768.600]                     Nitrogen Fixation                Ozone Depletion [G16.500.785]                Ozone Depletion                Refugium [G16.500.819]                Refugium                Rhizosphere [G16.500.853]                Rhizosphere                Steam [G16.500.887]                Steam                Water Cycle [G16.500.943]                Water Cycle                Water Movements [G16.500.971] +                Water Movements + PUBLIC HEALTH      Environmental Health [SP4]      Environmental Health           Environmental Chemistry [SP4.097]           Environmental Chemistry                Biochemical Reactions [SP4.097.021]                Biochemical Reactions                     Biogeochemical Cycle [SP4.097.021.194]                     Biogeochemical Cycle                          Carbon Cycle [SP4.097.021.194.640]                          Carbon Cycle                          Phosphorus Cycle [SP4.097.021.194.645]                          Phosphorus Cycle                          Nitrogen Cycle [SP4.097.021.194.650]                          Nitrogen Cycle

Nitrogen Cycle - Preferred

Concept UI	M0542469
Scope note	The circulation of nitrogen in nature, consisting of a cycle of biochemical reactions in which atmospheric nitrogen is compounded, dissolved in rain, and deposited in the soil, where it is assimilated and metabolized by animals, plants, bacteria, and fungi, eventually returning to the atmosphere by bacterial decomposition of organic matter.
Preferred term	Nitrogen Cycle
Entry term(s)	Cycle, Nitrogen Cycles, Nitrogen Nitrogen Cycles