title: Non-nitrogen fixing mutants of Azotobacter chroococcum.
mesh_terms: D001395:Azotobacter / Q000378:metabolism* / Q000528:radiation effects; D009154:Mutation / Q000528:radiation effects*; D009586:Nitrogen Fixation / Q000528:radiation effects*; D010860:Pigments, Biological; D011830:Radiation Effects; D014466:Ultraviolet Rays
chemical_list: D010860:Pigments, Biological