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BP: Fachverband Biologische Physik

BP 29: Posters: Biopolymers \& Biomaterials

BP 29.21: Poster

Donnerstag, 17. März 2011, 17:15–20:00, P3

About the stiffening-fluidization paradox in cell mechanics — Lars Wolff, •Andrea Kramer, and Klaus Kroy — ITP, Uni Leipzig

We examine the effect of inelastic breaking and reforming of transient bonds on the linear and nonlinear mechancis of biopolymer networks theoretically. We combine a natural mathematical representation of the kinetics of weak bonds with phenomenlogical models for the linear rheology, such as the Glassy Wormlike Chain or a generic power-law fluid, and thereby extend their range of validity to nonlinear experimental situations. We show that bond breaking can lead to robust non-Maxwellian absorption patterns in the linear and weakly nonlinear rheology, which are to a large extent independent of the particular viscoelastic model chosen. We further show that transient bond breaking and reforming can resolve the stiffening-fluidization paradox of cell mechanics, i.e. that a material vulnerable to transient bond breaking can show strain or stress stiffening and fluidization, depending on the particular experimental protocol.