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Charge motion within DNA stacks, probed by measurements of electric conductivity and by time-resolved and steady-state damage yield measurements, is determined by a complex mixture of electronic effects, coupling to quantum and classical degrees of freedom of the atomic motions in the bath, and the effects of static and dynamic disorder. The resulting phenomena are complex, and probably cannot be...
The electronic coupling Vda is the parameter which determines most strongly how the charge-transfer rate between donor and acceptor depends on the distance between the sites and the mutual orientation of donor and acceptor moieties. We discuss quantum chemical procedures to estimate electronic coupling matrix elements of hole transfer in DNA. The two-state model...
It has been widely considered that the wavefunction of an extra electron or hole on the base stack of a DNA molecule is confined to a single site, i.e., base or base pair. There is, however, a theorem that an extra carrier on a one-dimensional chain minimizes its energy by forming a large polaron polaron large , its wavefunction extended over a number of sites. Thus it is expected, and calculations...
In this review investigations of hole and electron transfer processes in DNA after γ-irradiation at low temperatures are described. These experiments suggest that at low temperatures DNA is a good ion radical trap, one which traps 30 to 60% of all electrons and holes produced by radiation. Electrons are trapped at the pyrimidine bases, cytosine and thymine, whereas holes are trapped mainly on guanine...
The nucleic acid analog 2-aminopurine (2AP) can be site-specifically incorporated into oligonucleotides without significantly affecting the thermal stabilities of DNA DNA duplexes. Because the absorption band of 2AP extends beyond 300 nm, it can be selectively ionized with intense 308-nm excimer laser pulses by a tandem two-photon absorption mechanism yielding site-specifically positioned 2AP radical...
Introduction The redox reactions of the guanine nucleobase have received considerable attention because of the importance of these redox reactions in aging and metabolism [1], the potential utility of these oxidations in analytical techniques for detection of nucleic acids [2–5], and for use as donors in studies of electron-transfer reactions along the DNA double helix [6–8]. Electrochemistry is a...
Charge migration along DNA molecules has attracted scientific interest for over half a century. Reports on possible high rates of charge transfer between donor and acceptor through the DNA, obtained in the last decade from solution chemistry experiments on large numbers of molecules, triggered a series of direct electrical transport measurements through DNA single molecules, bundles, and networks...
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