title: [Effect of irradiation intensity on the production of free radicals by near-UV photosensitization of frozen adenine solutions with an inorganic phosphate].
abstract: The effect of light intensity on the production of free radicals by near-UV photosensitization at 77 K of frozen aqueous solutions of adenine in the presence of inorganic phosphate has been studied. A quantitative estimation of relative concentrations of the products: hydrogen atoms (H*), adenine, phosphate and OH* radicals was carried out using the computer analysis of EPR spectra of irradiated samples. It was found that the formation of phosphate and OH* radicals in a photosystem results predominantly from the absorption of two photons in the band of illumination. The production of H* occurs in two ways, which involve the absorption of one photon or two photons.
authors.forename: T A
authors.initials: TA
authors.lastname: Lozinova
authors.forename: A V
authors.initials: AV
authors.lastname: Lander
mesh_terms: D000225:Adenine / Q000737:chemistry / Q000528:radiation effects*; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals / Q000737:chemistry; D005615:Freezing; D010710:Phosphates / Q000737:chemistry / Q000528:radiation effects*; D017785:Photons; D012996:Solutions
chemical_list: D005609:Free Radicals; D010710:Phosphates; D012996:Solutions; D000225:Adenine