On the asymmetric elasticity of twisted dsDNA

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Title:	On the asymmetric elasticity of twisted dsDNA
Authors:	周子聰;Zhou, Zi-cong;黎璧賢;Lai, Pik-yi
Contributors:	淡江大學物理學系
Keywords:	Biopolymer;dsDNA;Elasticity
Date:	2005-05-01
Issue Date:	2009-12-31 10:39:16 (UTC+8)
Publisher:	Elsevier
Abstract:	We present an analytical-based proof for the consistency of two asymmetric elastic models of the double-stranded DNA in the regime around the B -form. We derive the shape equations in terms of Euler angles for a uniform ribbon with noncircular cross section and spontaneous torsion. We study the conditions to form a helical ribbon for the model and find that the Euler angle ψψ must be either 0 or π/2π/2. We find that the helix is always stable or at least metastable for the model, and there is either a continuous or discontinuous transition of extension, from a twisted straight ribbon to a helical ribbon. An “over-collapse” phenomena of extension is observed for the ribbon under twisting. The stability of the helix and the intrinsic asymmetric elasticity under twisting are also studied.
Relation:	Physica A: Statistical Mechanics and its Applications 350(1), pp.70-83
DOI:	10.1016/j.physa.2004.11.031
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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