Volume 88, Number 1, October 2009
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||14 October 2009|
Global cross-over dynamics of single semiflexible polymers
Department of Physics, Technical University of Munich - 85748 Garching, Germany, EU
Corresponding author: email@example.com
Accepted: 16 September 2009
We present a mean-field dynamical theory for single semiflexible polymers which can precisely capture, without fitting parameters, recent fluorescence correlation spectroscopy results on single-monomer kinetics of DNA strands in solution. Our approach works globally, covering three decades of strand length and five decades of time: it includes the complex cross-overs occurring between stiffness-dominated and flexible bending modes, along with larger-scale rotational and center-of-mass motion. The accuracy of the theory stems in part from long-range hydrodynamic coupling between the monomers, which makes a mean-field description more realistic. Its validity extends even to short, stiff fragments, where we also test the theory through Brownian hydrodynamics simulations.
PACS: 87.15.H- – Dynamics of biomolecules / 87.14.gk – DNA / 82.35.Lr – Physical properties of polymers
© EPLA, 2009
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