Direct measurement of the flow field around swimming microorganisms

Drescher, Knut and Goldstein, Raymond E. and Michel, Nicolas and Polin, Marco and Tuval, Idan. (2010) Direct measurement of the flow field around swimming microorganisms. Physical Review Letters, 105 (16). p. 168101.

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Official URL: https://edoc.unibas.ch/83552/

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Swimming microorganisms create flows that influence their mutual interactions and modify the rheology of their suspensions. While extensively studied theoretically, these flows have not been measured in detail around any freely-swimming microorganism. We report such measurements for the microphytes Volvox carteri and Chlamydomonas reinhardtii. The minute (∼0.3%) density excess of V. carteri over water leads to a strongly dominant Stokeslet contribution, with the widely-assumed stresslet flow only a correction to the subleading source dipole term. This implies that suspensions of V. carteri have features similar to suspensions of sedimenting particles. The flow in the region around C. reinhardtii where significant hydrodynamic interaction is likely to occur differs qualitatively from a puller stresslet, and can be described by a simple three-Stokeslet model.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Infection Biology > Microbiology and Biophysics (Drescher)
UniBasel Contributors:Drescher, Knut
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:23 Jun 2021 08:11
Deposited On:23 Jun 2021 08:11

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