Twist-Stretch Elasticity of DNA
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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.
7 Pages, plain LaTeX, 1 included eps figure. To appear in the Proceedings of The Syposium on Statistical Mechanics in Physics and Biology, MRS 1996 Fall Meeting
7 Pages, plain LaTeX, 1 included eps figure. To appear in the Proceedings of The Syposium on Statistical Mechanics in Physics and Biology, MRS 1996 Fall Meeting