laboratoire de physique statistique
 
 
laboratoire de physique statistique

Publications

Rechercher
Jean-François ALLEMAND 


PHYSICAL REVIEW LETTERS 


1
P U B L I C A T I O N S



 
2009
Measurement of the Torque on a Single Stretched and Twisted DNA Using Magnetic Tweezers - Mosconi, Francesco and Allemand, Jean Francois and Bensimon, David and Croquette, Vincent
PHYSICAL REVIEW LETTERS 102 (2009) 
LPS


Abstract : We deduced the torque applied on a single stretched and twisted DNA by integrating the change in the molecule's extension with respect to force as it is coiled. While consistent with previous direct measurements of the torque at high forces (F > 1 pN), this method, which is simple and does not require a sophisticated setup, allows for lower force estimates. We used this approach to deduce the effective torsional modulus of DNA, which decreases with force, and to estimate the buckling torque of DNA as a function of force in various salt conditions.