Twist-Stretch Elasticity of DNA

Details Twist-Stretch Elasticity of DNA Twist-Stretch Elasticity of DNA

1996-12-09

arxiv.org/abs/cond-mat/9612085v1

MRS Proceedings Vol. 463 (MRS, Pittsburgh, 1997)

Physics

Condensed Matter

Soft Condensed Matter

7 Pages, plain LaTeX, 1 included eps figure. To appear in the Proceedings of The Syposium on Statistical Mechanics in Physics

Scientific paper

The symmetries of the DNA double helix require a new term in its linear response to stress: the coupling between twist and stretch. Recent experiments with torsionally-constrained single molecules give the first direct measurement of this important material parameter. We extract its value from a recent experiment of Strick, et al. and find rough agreement with an independent experimental estimate recently given by Marko. We also present a very simple microscopic theory predicting a value comparable to the one observed.

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