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Microalgae scatter off solid surfaces by hydrodynamic and contact forces

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Contino, Matteo, Lushi, Enkeleida, Tuval, Idan, Kantsler, Vasily and Polin, Marco (2015) Microalgae scatter off solid surfaces by hydrodynamic and contact forces. Physical Review Letters, 115 (25). pp. 1-5. 258102. doi:10.1103/PhysRevLett.115.258102

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.115.258102

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Abstract

Interactions between microorganisms and solid boundaries play an important role in biological processes, such as egg fertilization, biofilm formation, and soil colonization, where microswimmers move within a structured environment. Despite recent efforts to understand their origin, it is not clear whether these interactions can be understood as being fundamentally of hydrodynamic origin or hinging on the swimmer’s direct contact with the obstacle. Using a combination of experiments and simulations, here we study in detail the interaction of the biflagellate green alga Chlamydomonas reinhardtii, widely used as a model puller microorganism, with convex obstacles, a geometry ideally suited to highlight the different roles of steric and hydrodynamic effects. Our results reveal that both kinds of forces are crucial for the correct description of the interaction of this class of flagellated microorganisms with boundaries.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Microalgae, Flagella (Microbiology)
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 17 December 2015
Dates:
DateEvent
17 December 2015Published
17 July 2015Submitted
Volume: 115
Number: 25
Number of Pages: 5
Page Range: pp. 1-5
Article Number: 258102
DOI: 10.1103/PhysRevLett.115.258102
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: American Physical Society
Funder: Engineering and Physical Sciences Research Council (EPSRC), Spain. Ministerio de Economía y Competitividad
Grant number: FIS2013-48444-C2-1-P
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