Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.198103
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Funding
- BBSRC
- Leverhulme Trust
- NSF [DMR0803153]
- Schlumberger Chair Fund
- BBSRC [BB/F021844/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/F021844/1] Funding Source: researchfish
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In contexts such as suspension feeding in marine ecologies there is an interplay between Brownian motion of nonmotile particles and their advection by flows from swimming microorganisms. As a laboratory realization, we study passive tracers in suspensions of eukaryotic swimmers, the alga Chlamydomonas reinhardtii. While the cells behave ballistically over short intervals, the tracers behave diffusively, with a time-dependent but self-similar probability distribution function of displacements consisting of a Gaussian core and robust exponential tails. We emphasize the role of flagellar beating in creating oscillatory flows that exceed Brownian motion far from each swimmer.
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