Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3620
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dc.contributor.authorSinha, Supurna-
dc.date.accessioned2008-07-31T10:30:07Z-
dc.date.available2008-07-31T10:30:07Z-
dc.date.issued2008-06-
dc.identifier.citationPhysical Review E, 2008, Vol.77, 061903en
dc.identifier.issnE-ISSN: 1550-2376-
dc.identifier.issnP-ISSN: 1539-3755-
dc.identifier.urihttp://hdl.handle.net/2289/3620-
dc.descriptionOpen Accessen
dc.description.abstractWe investigate the role of fluctuations in single-molecule measurements of torque-link (t-lk) curves. For semiflexible polymers of finite persistence length (i.e., polymers with contour length L comparable to the persistence length LP), the torque versus link curve in the constant-torque (isotorque) ensemble is distinct from the one in the constant-link (isolink) ensemble. Thus, one encounters the conceptually interesting issue of a “free energy of transition” in switching ensembles while making torque-link measurements. We predict the dependence on the semiflexibility parameter beta=L/LP of this extra contribution to the free energy, which shows up as an area in the torque-link plane. This can be tested against future torque-link experiments with single biopolymers. We bring out the inequivalence of torque-link curves for a stiff polymer and present explicit analytical expressions for the distinct torque-link relations in the two ensembles and the free-energy difference in switching ensembles in this context. The predictions of our work can be tested against single-molecule experiments on torsionally constrained biopolymers.en
dc.format.extent88284 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevE.77.061903en
dc.relation.urihttp://arxiv.org/abs/0805.2458en
dc.rights2008 The American Physical Societyen
dc.titleFree energy of twisted semiflexible polymersen
dc.typeArticleen
Appears in Collections:Research Papers (TP)

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