期刊
EUROPHYSICS LETTERS
卷 76, 期 2, 页码 346-352出版社
EDP SCIENCES S A
DOI: 10.1209/epl/i2006-10254-x
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The diffusion of charged semiflexible polymers is studied by hydrodynamic simulations. The salt-dependent diffusion constant exhibits a shallow minimum at a screening length comparable to the polymer length. Fluorescence correlation spectroscopy data for 394 bp ds-DNA fragments confirm the relative insensitivity of diffusion over a wide range of salt concentrations. A scaling expression for the diffusion constant of a neutral semiflexible chain encompassing the rod, the intermediate ideal and the asymptotic swollen regime is constructed.
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