Characteristics of alternating current hopping conductivity in DNA sequences
Ma Song-Shan(马松山)a)†, Xu Hui(徐慧)a), Wang Huan-You(王焕友)a)b), and Guo Rui(郭锐)a)
a School of Physical Science and Technology, Central South University, Changsha 410083, China; b Department of Physics, Xiangnan University, Chenzhou 423000, China
Abstract This paper presents a model to describe alternating current (AC) conductivity of DNA sequences, in which DNA is considered as a one-dimensional (1D) disordered system, and electrons transport via hopping between localized states. It finds that AC conductivity in DNA sequences increases as the frequency of the external electric field rises, and it takes the form of $\sigma_{\rm ac}(\omega)\sim \omega^2 \ln^2(1/\omega)$. Also AC conductivity of DNA sequences increases with the increase of temperature, this phenomenon presents characteristics of weak temperature-dependence. Meanwhile, the AC conductivity in an off-diagonally correlated case is much larger than that in the uncorrelated case of the Anderson limit in low temperatures, which indicates that the off-diagonal correlations in DNA sequences have a great effect on the AC conductivity, while at high temperature the off-diagonal correlations no longer play a vital role in electric transport. In addition, the proportion of nucleotide pairs p also plays an important role in AC electron transport of DNA sequences. For p < 0.5, the conductivity of DNA sequence decreases with the increase of p, while for p ≥ 0.5, the conductivity increases with the increase of p.
Received: 03 January 2009
Revised: 19 January 2009
Accepted manuscript online:
Fund: Project supported by the Doctoral
Program Foundation of Institutions of Higher Education, China (Grant
No 20070533075).
Cite this article:
Ma Song-Shan(马松山), Xu Hui(徐慧), Wang Huan-You(王焕友), and Guo Rui(郭锐) Characteristics of alternating current hopping conductivity in DNA sequences 2009 Chin. Phys. B 18 3591
Fractals in DNA sequence analysis Yu Zu-Guo (喻祖国), Vo Anh, Gong Zhi-Min (龚志民), Long Shun-Chao (龙顺湖). Chin. Phys. B, 2002, 11(12): 1313-1318.
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