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Universal entrainment mechanism controls contact times with motile cells
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Mathijssen, Arnold, Jeanneret, Raphaël and Polin, Marco (2018) Universal entrainment mechanism controls contact times with motile cells. Physical Review Fluids, 3 (3). 033103. doi:10.1103/PhysRevFluids.3.033103
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Official URL: http://doi.org/10.1103/PhysRevFluids.3.033103
Abstract
Contact between particles and motile cells underpins a wide variety of biological processes, from nutrient capture and ligand binding to grazing, viral infection, and cell-cell communication. The window of opportunity for these interactions depends on the basic mechanism determining contact time, which is currently unknown. By combining experiments on three different species—Chlamydomonas reinhardtii, Tetraselmis subcordiforms, and Oxyrrhis marina—with simulations and analytical modeling, we show that the fundamental physical process regulating proximity to a swimming microorganism is hydrodynamic particle entrainment. The resulting distribution of contact times is derived within the framework of Taylor dispersion as a competition between advection by the cell surface and microparticle diffusion, and predicts the existence of an optimal tracer size that is also observed experimentally. Spatial organization of flagella, swimming speed, and swimmer and tracer size influence entrainment features and provide tradeoffs that may be tuned to optimize the estimated probabilities for microbial interactions like predation and infection.
Item Type: | Journal Article | ||||||||||||
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Subjects: | Q Science > QR Microbiology | ||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
Library of Congress Subject Headings (LCSH): | Microorganisms, Marine ecology, Chlamydomonas reinhardtii, Reynolds number | ||||||||||||
Journal or Publication Title: | Physical Review Fluids | ||||||||||||
Publisher: | American Physical Society | ||||||||||||
Official Date: | 20 March 2018 | ||||||||||||
Dates: |
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Volume: | 3 | ||||||||||||
Number: | 3 | ||||||||||||
Article Number: | 033103 | ||||||||||||
DOI: | 10.1103/PhysRevFluids.3.033103 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
Copyright Holders: | American Physical Society | ||||||||||||
Date of first compliant deposit: | 18 April 2018 | ||||||||||||
Date of first compliant Open Access: | 18 April 2018 | ||||||||||||
RIOXX Funder/Project Grant: |
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