Surface conversion of the dynamics of bacteria escaping chemorepellents - CNRS - Centre national de la recherche scientifique
Article Dans Une Revue European Physical Journal E: Soft matter and biological physics Année : 2024

Surface conversion of the dynamics of bacteria escaping chemorepellents

Résumé

Flagellar swimming hydrodynamics confers a recognized advantage for attachment on solid surfaces. Whether this motility further enables the following environmental cues was experimentally explored. Motile E. coli (OD ∼ 0.1) in a 100 μm-thick channel were exposed to off-equilibrium gradients set by a chemorepellent Ni(NO$_3$)$_2$-source (250 mM). Single bacterial dynamics at the solid surface was analyzed by dark-field videomicroscopy at a fixed position. The number of bacteria indicated their congregation into a wave escaping from the repellent source. Besides the high velocity drift in the propagation direction within the wave, an unexpectedly high perpendicular component drift was also observed. Swimming hydrodynamics CW-bends the bacteria trajectories during their primo approach to the surface (< 2 μm), and a high enough tumbling frequency likely preserves a notable lateral drift. This comprehension substantiates a survival strategy tailored to toxic environments, which involves drifting along surfaces, promoting the inception of colonization at the most advantageous sites.
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hal-04699844 , version 1 (17-09-2024)

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Asma Braham, Laurence Lemelle, Romain Ducasse, Houyem Toukabri, Eleonore Mottin, et al.. Surface conversion of the dynamics of bacteria escaping chemorepellents. European Physical Journal E: Soft matter and biological physics, 2024, 47 (9), pp.56. ⟨10.1140/epje/s10189-024-00450-7⟩. ⟨hal-04699844⟩
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