منابع مشابه
Crawling cell locomotion revisited.
C ell crawling is of primary importance for such fundamental biological processes as embryonic development, wound healing, inflammation, and cancer metastasis (1). Motion of cells along extracellular substrates or matrices requires an apparently very simple condition: a fairly small force has to be applied to the cell to move it against the friction between the cell surface and the surrounding ...
متن کاملBipedal locomotion in crawling cells.
Many complex cellular processes from mitosis to cell motility depend on the ability of the cytoskeleton to generate force. Force-generating systems that act on elastic cytoskeletal elements are prone to oscillating instabilities. In this work, we have measured spontaneous shape and movement oscillations in motile fish epithelial keratocytes. In persistently polarized, fan-shaped cells, retracti...
متن کاملCrawling scallop: friction-based locomotion with one degree of freedom.
Fluid-based locomotion at low Reynolds number is subject to the constraints of the scallop theorem, which dictate that body kinematics identical under a time-reversal symmetry (in particular, those with a single degree of freedom) cannot display locomotion on average. The implications of the theorem naturally compel one to ask whether similar symmetry constraints exist for locomotion in differe...
متن کاملControl and Omni-directional Locomotion of a Crawling Quadruped
robot to mass (with friction) Force in, velocity out causality Ewoud Vos 6 Mass Impedance Legged robot controller Fig. 1: Abstraction of a legged robot to an omni-directional moving mass that can then, for instance, be controlled by an impedance controller. Fig. 1. This scheme requires a gait controller that ensures that the legs move to support the motion of the robot. The gait generator as pr...
متن کاملCrawling Beneath the Free Surface: Water Snail Locomotion
Sungyon Lee, John W. M. Bush, A. E. Hosoi, and Eric Lauga 1 Hatsopoulos Microfluids Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139 2 Department of Mathematics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139 3 Department of Mechanical and Aerospace Eng...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2011
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.1116814108