Motility fractionation of bacteria by centrifugation
arXiv:1310.2753 · doi:10.1039/C3SM51223A
Abstract
Centrifugation is a widespread laboratory technique used to separate mixtures into fractions characterized by a specific size, weight or density. We demonstrate that centrifugation can be also used to separate swimming cells having different motility. To do this we study self-propelled bacteria under the influence of an external centrifugal field. Using dynamic image correlation spectroscopy we measure the spatially resolved motility of bacteria after centrifugation. A significant gradient in swimming-speeds is observed for increasing centrifugal speeds. Our results can be reproduced by a model that treats bacteria as "hot" colloidal particles having a diffusion coefficient that depends on the swimming speed.
7 pages, 5 figures (in press)
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Cited by in corpus (16)
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- Multidimensional Stationary Probability Distribution for Interacting Active Particles
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- Towards a statistical mechanical theory of active fluids
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- Diffusion of active chiral particles
- Motility-sorting of self-propelled particles in micro-channels
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