title: Nitrogen fixation in the rumen of a living sheep.
mesh_terms: D000114:Acetylene / Q000378:metabolism; D000821:Animal Feed; D000818:Animals; D005030:Ethylenes / Q000378:metabolism; D008697:Methane / Q000378:metabolism; D009586:Nitrogen Fixation; D012417:Rumen / Q000382:microbiology*; D012756:Sheep; D013997:Time Factors
chemical_list: D005030:Ethylenes; D000114:Acetylene; D008697:Methane