Accueil >
Production scientifique
 |
Statistical physics and computational methods for conformation, spatial organisation and dynamics of biopolymers
Auteur(s): Walter J.-C.
(Séminaires)
Babraham Institute (Cambridge, GB), 2014-02-14 |
|
|
Unwinding relaxation dynamics of a polymer: a model for single bio-macromolecules ? 
Auteur(s): Walter J.-C.
Conference: Architecture et Dynamique Nucléaire (ADN) (Jussieu, FR, 2014-04-10)
Ref HAL: hal-01955909_v1
Exporter : BibTex | endNote
Résumé: The relaxation dynamics of a polymer wound around a fixed obstacle constitutes a fundamental instance of polymer with twist and torque, and it is also of relevance for DNA denaturation dynamics. We investigate it by simulations and Langevin equation analysis. The latter predicts a relaxation time scaling as a power of the polymer length times a logarithmic correction related to the equilibrium fluctuations ofthe winding angle. The numerical data support this result and show that at short times the winding angle decreases as a power law. This is also in agreement with the Langevin equation provided a winding-dependent friction is used, suggesting that such reduced description of the system captures the basic features of the problem.
|
|
Statistical physics and computational methods for conformation, spatial organisation and dynamics of biopolymers
Auteur(s): Walter J.-C.
(Séminaires)
LMBE (Toulouse, FR), 2014-02-14 |
|
Modeling bacterial DNA segregation
Auteur(s): Walter J.-C.
(Séminaires)
LMGM-IBC (Toulouse, FR), 2014-12-15 |
|
|
|
Unwinding relaxation dynamics of a polymer: a model for single bio-macromolecules ?
Auteur(s): Walter J.-C.
Conference: The Physics of Soft and Biological Matter (Cambridge, GB, 2014-04-15)
Ref HAL: hal-01955881_v1
Exporter : BibTex | endNote
Résumé: The relaxation dynamics of a polymer wound around a fixed obstacle constitutes a fundamental instance of polymer with twist and torque, and it is also of relevance for DNA denaturation dynamics. We investigate it by simulations and Langevin equation analysis. The latter predicts a relaxation time scaling as a power of the polymer length times a logarithmic correction related to the equilibrium fluctuations of the winding angle. The numerical data support this result and show that at short times the winding angle decreases as a power law. This is also in agreement with the Langevin equation provided a winding-dependent friction is used, suggesting that such reduced description of the system captures the basic features of the problem.
|
|
|
|
Rotational dynamics of entangled polymers
Auteur(s): Walter J.-C., Laleman Michiel, Baiesi Marco, Carlon Enrico
Conference: Brownian Motion in Confined Geometries (Dresden, DE, 2014-03-17)
Actes de conférence: EPJ-ST, vol. 223 p.1-13 (2014)
Texte intégral en Openaccess : 
Ref HAL: hal-01100019_v1
Ref Arxiv: 1409.0378
DOI: 10.1140/epjst/e2014-02327-3
WoS: 000346416400012
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
4 Citations
Résumé: Some recent results on the rotational dynamics of polymers are reviewed and extended. We focus here on the relaxation of a polymer, either flexible or semiflexible, initially wrapped around a rigid rod. We also study the steady polymer rotation generated by a constant torque on the rod. The interplay of frictional and entropic forces leads to a complex dynamical behavior characterized by non-trivial universal exponents. The results are based on extensive simulations of polymers undergoing Rouse dynamics and on an analytical approach using force balance and scaling arguments. The analytical results are in general in good agreement with the simulations, showing how a simplified approach can correctly capture the complex dynamical behavior of rotating polymers.
Commentaires: 13 pages; 7 figures; proceedings of the International Workshop on "Brownian Motion in Confined Geometries", Max Planck Institute for the Physics of Complex Systems in Dresden from 17 - 21 March 2014; to appear in EPJ-ST
|
