title: pH dependence of EPR spectra of nitroxides containing ionizable groups.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D009589:Nitrogen Oxides; D013113:Spin Labels
chemical_list: D009589:Nitrogen Oxides; D013113:Spin Labels