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. 2010 Nov 16;5(11):e13914. doi: 10.1371/journal.pone.0013914

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Stephens et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(a) Mean–square displacement as a function of time along the trajectory [Eq (1)]. At short times we see ballistic () behavior, crossing over to diffusion [] at long times. (b) The orientation angle correlation function [Eq (2)] for worm motion (red), contrasted with a simple “run and tumble” model (blue) in which reorientation events occur randomly with rate , corresponding to the rate of reorientation events [14], [21].

Inline graphic — (a) Mean–square displacement as a function of time along the trajectory [Eq (1)]. At short times we see ballistic () behavior, crossing over to diffusion [] at long times. (b) The orientation angle correlation function [Eq (2)] for worm motion (red), contrasted with a simple “run and tumble” model (blue) in which reorientation events occur randomly with rate , corresponding to the rate of reorientation events [14], [21].