丁香园AV

Synopsis

鈥淣onlinear Phototaxis and Instabilities in Suspensions of Light-Seeking Algae,鈥�

by Aina Ramamonjy, Julien Dervaux , and Philippe Brunet

Phys. Rev. Lett. 128, 258101 (2022)

See also the Physics Viewpoint 鈥淐omplex Dance of Light-Seeking Algae in Light Gradients,鈥�

by Anupam Sengupta

Motile microbes move in response to various external stimuli by biasing their swimming direction. At large enough concentrations of microswimmers, self-organized structures and flow patterns emerge, a phenomenon called bioconvection. In this paper, the authors investigate the phototactic response of a population of the Chlamydomonas algae which seeks optimal light conditions. They reveal that its response to light stimuli is highly nonlinear and that the cells鈥� self-organization can become unstable due to interactions between phototaxis and other bioconvection.

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