title: Perspectives on the modern nitrogen cycle.
authors.affiliation: University of Colorado, USA.
authors.forename: Alan R
authors.initials: AR
authors.lastname: Townsend
authors.forename: Luiz A
authors.initials: LA
authors.lastname: Martinelli
authors.forename: Nancy B
authors.initials: NB
authors.lastname: Grimm
mesh_terms: D057231:Climate Change; D004777:Environment; D009584:Nitrogen / Q000737:chemistry* / Q000378:metabolism*; D009586:Nitrogen Fixation; D010758:Phosphorus / Q000737:chemistry / Q000378:metabolism; D026361:Reactive Nitrogen Species
chemical_list: D026361:Reactive Nitrogen Species; D010758:Phosphorus; D009584:Nitrogen