title: The effect of oxygen and benzoquinone concentration on the reversible spectrophotometric changes accompanying the photooxidation of porphyrins at low pH values.
mesh_terms: D002734:Chlorophyll / Q000528:radiation effects*; D000431:Ethanol; D006863:Hydrogen-Ion Concentration; D007211:Indoles / Q000528:radiation effects; D008027:Light; D000432:Methanol; D010084:Oxidation-Reduction; D010100:Oxygen; D010777:Photochemistry; D011809:Quinones; D011830:Radiation Effects; D013053:Spectrophotometry
chemical_list: D007211:Indoles; D011809:Quinones; D002734:Chlorophyll; D000431:Ethanol; D010100:Oxygen; D000432:Methanol