Detalls de la publicació.

Article

Any:2019
Autor(s):Jorge Arrieta, Marco Polin, Ramón Saleta-Piersanti, Idan Tuval
Títol:Light control of localized photo-bioconvection
Revista:PHYSICAL REVIEW LETTERS
ISSN:0031-9007
JCR Impact Factor:8.385
Volum:123
Pàgines:158101
D.O.I.:https://doi.org/10.1103/PhysRevLett.123.158101
Web:https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.158101
Resum:
Microorganismal motility is often characterised by complex responses to environmental physico- chemical stimuli. Although the biological basis of these responses is often not well understood, their exploitation already promises novel avenues to directly control the motion of living active matter at both the individual and collective level. Here we leverage the phototactic ability of the model microalga Chlamydomonas reinhardtii to precisely control the timing and position of localised cell photo-accumulation, leading to the controlled development of isolated bioconvective plumes. This novel form of photo-bio-convection allows a precise, fast and reconfigurable control of the spatio-temporal dynamics of the instability and the ensuing global recirculation, which can be activated and stopped in real time. A simple continuum model accounts for the phototactic response of the suspension and demonstrates how the spatio-temporal dynamics of the illumination field can be used as a simple external switch to produce efficient bio-mixing.

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