Entrainment dominates the interaction of microalgae with micron-sized objects

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dc.contributor.author Jeanneret, Raphaël
dc.contributor.author Pushkin, Dmitri
dc.contributor.author Kantsler, Vasily
dc.contributor.author Polin, Marco
dc.date.accessioned 2019-07-17T10:43:41Z
dc.date.available 2019-07-17T10:43:41Z
dc.identifier.uri http://hdl.handle.net/11201/149640
dc.description.abstract [eng] The incessant activity of swimming microorganisms has a direct physical effect on surrounding microscopic objects, leading to enhanced diffusion far beyond the level of Brownian motion with possible influences on the spatial distribution of non-motile planktonic species and particulate drifters. Here we study in detail the effect of eukaryotic flagellates, represented by the green microalga Chlamydomonas reinhardtii, on microparticles. Macro- and microscopic experiments reveal that microorganism-colloid interactions are dominated by rare close encounters leading to large displacements through direct entrainment. Simulations and theoretical modelling show that the ensuing particle dynamics can be understood in terms of a simple jump-diffusion process, combining standard diffusion with Poisson-distributed jumps. This heterogeneous dynamics is likely to depend on generic features of the near-field of swimming microorganisms with front-mounted flagella.
dc.format application/pdf
dc.relation.isformatof Versió postprint del document publicat a: https://doi.org/10.1038/ncomms12518(2016)
dc.relation.ispartof Nature Communications, 2016, vol. 7, num. 12518, p. 1-7
dc.rights (c) Jeanneret, Raphaël et al., 2016
dc.subject.classification 53 - Física
dc.subject.other 53 - Physics
dc.title Entrainment dominates the interaction of microalgae with micron-sized objects
dc.type info:eu-repo/semantics/article
dc.type info:eu-repo/semantics/acceptedVersion
dc.date.updated 2019-07-17T10:43:41Z
dc.rights.accessRights info:eu-repo/semantics/openAccess
dc.identifier.doi https://doi.org/10.1038/ncomms12518(2016)

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