title: Letter: UV-induced free radicals in frozen acidic solutions of levulinic acid.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals; D005615:Freezing; D006863:Hydrogen-Ion Concentration; D007982:Levulinic Acids / Q000528:radiation effects*; D012996:Solutions; D014466:Ultraviolet Rays
chemical_list: D005609:Free Radicals; D007982:Levulinic Acids; D012996:Solutions