title: Nitrogen fixation by nitrate reductase deficient mutants of Rhizobium japonicum.
mesh_terms: D009154:Mutation; D009565:Nitrate Reductases / Q000235:genetics*; D009586:Nitrogen Fixation; D012231:Rhizobium / Q000235:genetics / Q000378:metabolism*
chemical_list: D009565:Nitrate Reductases