منابع مشابه
On 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 کاملNonaffine rubber elasticity for stiff polymer networks.
We present a theory for the elasticity of cross-linked stiff polymer networks. Stiff polymers, unlike their flexible counterparts, are highly anisotropic elastic objects. Similar to mechanical beams, stiff polymers easily deform in bending, while they are much stiffer with respect to tensile forces ("stretching"). Unlike in previous approaches, where network elasticity is derived from the stret...
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. ...
متن کامل3 Elasticity of semiflexible polymer networks with flexible cross - links
Recent experiments have demonstrated that the nonlinear elasticity of in vitro networks of the biopolymer actin is dramatically altered in the presence of a flexible cross-linker such as the cytoskeletal protein filamin. The basic principles governing the mechanical properties of such networks, however, remain poorly understood. Here we describe an effective medium theory of flexibly cross-link...
متن کاملScale-dependent non-affine elasticity of semiflexible polymer networks
The cytoskeleton of eukaryotic cells provides mechanical support and governs intracellular transport. These functions rely on the complex mechanical properties of networks of semiflexible protein filaments. Recent theoretical interest has focused on mesoscopic properties of such networks and especially on the effect of local, non-affine bending deformations on mechanics. Here, we study the impa...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2003
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.91.108103