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Science 19 October 2001:
Vol. 294. no. 5542, p. 473
DOI: 10.1126/science.294.5542.473b
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Many experimental and theoretical studies have been aimed at elucidating the mechanism for the transport of electrons and holes through DNA. Barnett et al. (p. 567) have now used molecular dynamics simulations and first-principles structure calculations to show that even the hydrated counterions that interact with phosphate groups can exert a large effect on the rate of hole transport. Inclusion of the hydrated ion favors correlated motions of the helix that facilitate transport. Experimental studies revealed that electron transport rates are reduced in DNA strands containing uncharged methylphosphonate bridges.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)