title: The photochemistry of purine components of nucleic acids. I. The efficiency of photolysis of adenine and guanine derivatives in aqueous solution.
abstract: It has been shown that the quantum yield of the photochemical conversion of adenine and the corresponding nucleosides and nucleoside 5'-phosphates in liquid (pH 5.6 and 2.0) and frozen aqueous solutions do not exceed 10(-4). The quantum yield of the photoconversion of guanine-containing nucleosides and nucleoside 5'-phosphates in liquid aqueous solution (pH 5.6) after removal of oxygen by passing through nitrogen and in the frozen state do not exceed 0.3 x 10(-4). The quantum yield in oxygen-containing liquid aqueous solutions increase to 0.3 x 10(-3), i.e. to values commensurate with the quantum yield of pyrimidine photolysis.
mesh_terms: D000225:Adenine; D000227:Adenine Nucleotides; D000241:Adenosine; D006147:Guanine; D006150:Guanine Nucleotides; D006151:Guanosine; D006863:Hydrogen-Ion Concentration; D010100:Oxygen; D010313:Partial Pressure; D010782:Photolysis; D011789:Quantum Theory; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature; D013997:Time Factors
chemical_list: D000227:Adenine Nucleotides; D006150:Guanine Nucleotides; D006151:Guanosine; D006147:Guanine; D000225:Adenine; D000241:Adenosine; D010100:Oxygen