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1 LIPHY-DYFCOM LIPhy - Laboratoire Interdisciplinaire de Physique Saint Martin d’Hères 2 DYFCOM LIPhy - Laboratoire Interdisciplinaire de Physique Saint Martin d’Hères 3 LIPhy - Laboratoire Interdisciplinaire de Physique Saint Martin d’Hères

Abstract : The measurement of a quantitative and macroscopic parameter to estimate the global motility of a large population of swimming biological cells is a challenge. Experiments on the rheology of active suspensions have been performed. Effective viscosity of sheared suspensions of live unicellular motile microalgae Chlamydomonas Reinhardtii is far greater than for suspensions containing the same volume fraction of dead cells. In addition, suspensions show shear thinning behavior. We relate these macroscopic measurements to the orientation of individual swimming cells under flow and discuss our results in the light of several existing models.





Autor: Salima Rafaï - Philippe Peyla - Jibuti Levan -

Fuente: https://hal.archives-ouvertes.fr/



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