Actin-based propulsion of functionalized hard versus fluid spherical objects
نویسندگان
چکیده
منابع مشابه
Actin-based propulsion of spatially extended objects
We propose a mathematical model of the actin-based propulsion of spatially extended obstacles. It starts from the properties of individual actin filaments and includes transient attachment to the obstacle, polymerization as well as cross-linking. Two particular geometries are discussed, which apply to the motion of protein-coated beads in a cell-like medium and the leading edge of a cell protru...
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Two theoretical models dominate current understanding of actin-based propulsion: microscopic polymerization ratchet model predicts that growing and writhing actin filaments generate forces and movements, while macroscopic elastic propulsion model suggests that deformation and stress of growing actin gel are responsible for the propulsion. We examine both experimentally and computationally the 2...
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A. E. Carlsson Department of Physics, Washington University, St. Louis, Mo. 63130 (Dated: February 2, 2008) Abstract Theory and experiment have established that F-actin filaments are strongly attached to the intracellular parasites (such as Listeria) they propel with “comet tails”. We consider the implications of these observations for propulsion. By calculating the motion produced in various m...
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We study the motion of oil drops propelled by actin polymerization in cell extracts. Drops deform and acquire a pearlike shape under the action of the elastic stresses exerted by the actin comet, a tail of cross-linked actin filaments. We solve this free boundary problem and calculate the drop shape taking into account the elasticity of the actin gel and the variation of the polymerization velo...
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The self-propulsion of a sphere immersed in a polar liquid or ferrofluid is studied on the basis of ferrohydrodynamics. In the electrical case an oscillating charge density located inside the sphere generates an electrical field that polarizes the fluid. The lag of polarization with respect to the electrical field due to relaxation generates a time-independent electrical torque density acting o...
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ژورنال
عنوان ژورنال: New Journal of Physics
سال: 2008
ISSN: 1367-2630
DOI: 10.1088/1367-2630/10/2/025001