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Article Dans Une Revue Physical Review Letters Année : 2022

Nonlinear Phototaxis and Instabilities in Suspensions of Light-Seeking Algae

Julien Dervaux
Philippe Brunet

Résumé

The mechanism by which living organisms seek optimal light conditions-phototaxis-is a fundamental process for motile photosynthetic microbes. It is involved in a broad array of natural processes and applications from bloom formation to the production of high-value chemicals in photobioreactors. Here, we show that a population of the model alga Chlamydomonas reinhardtii exhibits a highly sensitive nonlinear response to light and demonstrate that the self-organization of cells in a heterogeneous environment becomes unstable as the result of a coupling between bioconvective flows and phototaxis.
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Dates et versions

hal-03864872 , version 1 (22-11-2022)

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Aina Ramamonjy, Julien Dervaux, Philippe Brunet. Nonlinear Phototaxis and Instabilities in Suspensions of Light-Seeking Algae. Physical Review Letters, 2022, 128, ⟨10.1103/physrevlett.128.258101⟩. ⟨hal-03864872⟩
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