Phosphorescence and Electron Spin Resonance Studies of the uv‐Excited Triplet State of DNA
作者： R. O. Rahn , R. G. Shulman , J. W. Longworth
DOI: 10.1063/1.1728051
关键词: Photochemistry 、 Phosphorescence 、 Electron paramagnetic resonance 、 Excited state 、 Thymidine 、 Triplet state 、 Thymine 、 DNA 、 Chemistry 、 Quantum yield 、 Physical and Theoretical Chemistry 、 General Physics and Astronomy
摘要: The phosphorescence of native DNA at 77°K is characterized by a broad band peaked (4480±30) A, and decay time (0.28±0.03) sec. quantum yield 0.002 considerably lower than the yields AMP GMP pH 7. Upon denaturing or degrading, was partly replaced characteristic from purines. efficiently quenched Mn2+ ions bound to DNA. Poly dAT had with (0.32±0.03) sec which similar thymidine 11 but showed no contribution adenine residues. Because similarity between poly phosphorescence, we inferred that originates in thymine bases. These inferences were confirmed observations ``Δm=2'' transitions triplet‐state ESR DNA, dAT, ionized thymidine. values Hmin 1054, 1046, 1067 G, respectively, all very different th...
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