Thymine-Hg(II)-thymine base pairs have been incorporated in an oligonucleotide duplex to study their effect on DNA-mediated charge transport. The introduction of a formally charged Hg atom inside the DNA base core does not significantly alter the charge hopping and trapping properties, as discussed in this paper. Hg(II) replaces the protons normally found on thymines within the complex and acts like a "big proton" in terms of its role in DNA charge transport.
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Joseph et al. (2007) studied this question.
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