Electron spin resonance study of electron transfer rates in DNA: determination of the tunneling constant beta for single-step excess electron transfer

Article Abstract:

Issues concerning electron transfer in DNA at low temperatures in an aqueous glassy medium are considered. In this system, electrons were generated by radiation and trapped on DNA. The transfer distances and rates were found to correlate with intercalator electron affinities determined by density functional theory.

Oxidation-reduction reaction, Oxidation-reduction reactions

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Electron spin resonance study of electron transfer in DNA: inter-double-strand tunneling processes

Article Abstract:

The frozen glassy aqueous (D2O) solutions of DNA at various concentrations are employed in order to test for inter-DNA-double-strand electron transfer. It is found that extensive tunneling of electrons and holes in frozen D2O aqueous solutions (ices) and solid DNA (hydrated to 21 waters per nucleotide) can be explained by inter-double-helix transfer.

Electric properties, Chemistry, Physical and theoretical, Physical chemistry, Aqueous solution reactions, Chemical properties

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Electron spin resonance study of the temperature dependence of electron transfer in DNA: Competitive processes of tunneling, protonation at carbon, and hopping

Article Abstract:

Electron spin resonance (ESR) spectroscopy is employed to investigate the effects of temperature on excess electron and hole transfer through DNA. It is found that the tunneling of electrons from DNA radicals to MX is the dominant process at temperatures less than or equal to 77 K.

Analysis, Usage, Electron paramagnetic resonance spectroscopy, Tunneling (Physics), Properties

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