Date of this Version
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. [Science 271 (1996) 1835] 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.
Kamien, R., Lubensky, T., Nelson, P. C., & O'Hern, C. S. (1996). Direct Determination of DNA Twist-Stretch Coupling. Europhysics Letters, 237-242. http://dx.doi.org/10.1209/epl/i1997-00231-y
Date Posted: 15 March 2017
This document has been peer reviewed.