This title appears in the Scientific Report : 2003 

Deformation of semiflexible chains
Winkler, R. G.
Theorie II; IFF-TH-II
The @journal of chemical physics, 118 (2003) S. 2919 - 2928
Melville, NY American Institute of Physics 2003
2919 - 2928
Journal Article
Kondensierte Materie
Journal of Chemical Physics 118
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The force-extension relation and the end-to-end distribution function are calculated in the constant force and constant extension ensemble, respectively, for a semiflexible chain of Gaussian segments. Qualitative differences are found for these quantities when the persistence length is on the order of the chain length. In particular, beyond a certain persistence length, the free energy assumes two extreme values in the constant extension ensemble corresponding to zero force at zero and at a finite extension. The comparison of the force-extension relation with experimental results on DNA exhibits excellent agreement. The approach provides a simple expression for the end-to-end distribution function which is in excellent agreement with Monte Carlo simulations of the Kratky-Porod semiflexible chain model. (C) 2003 American Institute of Physics.