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Quantifying the sorting efficiency of self-propelled run-and-tumble swimmers by geometrical ratchets

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Berdakin I., Silhanek A., Moyano Cortéz H., Marconi V., Condat C.
Open Physics
|
2013
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vol. 11
|
issue 12
1653-1661
EN
Suitable asymmetric microstructures can be used to control the direction of motion in microorganism populations. This rectification process makes it possible to accumulate swimmers in a region of space or to sort different swimmers. Here we study numerically how the separation process depends on the specific motility strategies of the microorganisms involved. Crucial properties such as the separation efficiency and the separation time for two bacterial strains are precisely defined and evaluated. In particular, the sorting of two bacterial populations inoculated in a box consisting of a series of chambers separated by columns of asymmetric obstacles is investigated. We show how the sorting efficiency is enhanced by these obstacles and conclude that this kind of sorting can be efficiently used even when the involved populations differ only in one aspect of their swimming strategy.
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Brownian motor moving in a fluctuating tube in the presence of a load

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Ou Z.-e., Yi S.-t., Huang X.-q., Xiong J.-w., Ai B.-q.
Open Physics
|
2011
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vol. 9
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issue 4
1010-1015
EN
The transport of Brownian particles moving along a three-dimensional fluctuating tube is investigated in the presence of a load. The tube wall can fluctuate between two states. Coarsening the description of a process for the sake of simplifying the dynamic will result in an entropic barrier and an effective diffusion coefficient. It is found that we can control the asymmetric parameter and the load force to control the current direction and there is an optimized transition rate at which the current takes a maximum value.
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