Light Control of Localized Photobioconvection

Jorge Arrieta, Marco Polin, Ramón Saleta-Piersanti, and Idan Tuval
Phys. Rev. Lett. 123, 158101 – Published 11 October 2019
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Abstract

Microorganismal motility is often characterized 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 localized cell photoaccumulation, leading to the controlled development of isolated bioconvective plumes. This novel form of photobioconvection allows a precise, fast, and reconfigurable control of the spatiotemporal 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 spatiotemporal dynamics of the illumination field can be used as a simple external switch to produce efficient bio mixing.

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  • Received 4 February 2019
  • Revised 4 July 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.158101

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Nonlinear DynamicsFluid DynamicsPhysics of Living Systems

Authors & Affiliations

Jorge Arrieta1,*, Marco Polin2,†, Ramón Saleta-Piersanti1, and Idan Tuval1,‡

  • 1Instituto Mediterráneo de Estudios Avanzados, IMEDEA, UIB-CSIC, Esporles, 07190, Spain
  • 2Physics Department and Centre for Mechanochemical Cell Biology, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom

  • *Corresponding author. jarrieta@imedea.uib-csic.es
  • Corresponding author. m.polin@warwick.ac.uk
  • Corresponding author. ituval@imedea.uib-csic.es

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Issue

Vol. 123, Iss. 15 — 11 October 2019

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