Physics – Biological Physics
Scientific paper
2003-01-14
Journal of Chemical Physics 118, 9864--9874 (2003)
Physics
Biological Physics
12 pages 10 figures. Revtex4
Scientific paper
10.1063/1.1569905
Motivated by recent experiments on DNA torsion-force-extension characteristics we consider the writhing geometry of open stiff molecules. We exhibit a cyclic motion which allows arbitrarily large twisting of the end of a molecule via an activated process. This process is suppressed for forces larger than femto-Newtons which allows us to show that experiments are sensitive to a generalization of the Calugareanu-White formula for the writhe. Using numerical methods we compare this formulation of the writhe with recent analytic calculations.
Maggs A. C.
Rossetto Vincent
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