منابع مشابه
Nonlinear elasticity of stiff biopolymers connected by flexible linkers.
Networks of the biopolymer actin, cross-linked by the compliant protein filamin, form soft gels. They can, however, withstand large shear stresses due to their pronounced nonlinear elastic behavior. The nonlinear elasticity can be controlled by varying the number of cross-links per actin filament. We propose and test a model of rigid filaments decorated by multiple flexible linkers that is in q...
متن کاملWrithe distribution of stiff biopolymers.
Motivated by the interest in the role of stiff polymers like actin in cellular processes and as components of biopolymer networks like the cytoskeleton, we present a statistical mechanical study of the twist elasticity of stiff polymers. We obtain simple, approximate analytical forms for the writhe distribution at zero applied force. We also derive simple analytical expressions for the torque-t...
متن کاملNonlinear elasticity of composite networks of stiff biopolymers with flexible linkers.
Motivated by recent experiments showing nonlinear elasticity of in vitro networks of the biopolymer actin cross-linked with filamin, we present an effective medium theory of flexibly cross-linked stiff polymer networks. We model such networks by randomly oriented elastic rods connected by flexible connectors to a surrounding elastic continuum, which self-consistently represents the behavior of ...
متن کاملOn the Elasticity of Stiff Polymer Networks
The mechanical properties of cytoskeletal actin bundles play an essential role in numerous physiological processes including hearing, fertilization, cell migration and growth. Cells employ a multitude of actin-binding proteins to regulate actively bundle dimensions and crosslinking properties to suit biological function. The mechanical properties of actin bundles vary by orders of magnitude dep...
متن کاملElasticity of floppy and stiff random networks.
We study the linear and nonlinear elastic behavior of amorphous systems using a two-dimensional random network of harmonic springs as a model system. A natural characterization of these systems arises in terms of the network coordination (average number of springs per node) relative to that of a marginally rigid network deltaz: a floppy network has deltaz<0, while a stiff network has deltaz>0. ...
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ژورنال
عنوان ژورنال: Physical Review E
سال: 2007
ISSN: 1539-3755,1550-2376
DOI: 10.1103/physreve.76.061801