title: The possible failure of 15N to affect fhe ESR spectrum of the non-heme iron proteins of Azotobacter vinelandii.
mesh_terms: D001395:Azotobacter / Q000032:analysis*; D001426:Bacterial Proteins / Q000032:analysis*; D004578:Electron Spin Resonance Spectroscopy; D007501:Iron / Q000032:analysis*; D009584:Nitrogen; D010313:Partial Pressure; D011868:Radioisotopes
chemical_list: D001426:Bacterial Proteins; D011868:Radioisotopes; D007501:Iron; D009584:Nitrogen