期刊
JOURNAL OF CHEMICAL PHYSICS
卷 118, 期 21, 页码 9864-9874出版社
AMER INST PHYSICS
DOI: 10.1063/1.1569905
关键词
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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 femtonewtons 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. (C) 2003 American Institute of Physics.
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