Run-to-Tumble Variability Controls the Surface Residence Times of $E.coli$ Bacteria

Abstract

Motile bacteria are known to accumulate at surfaces, eventually leading to changes in bacterial motility and bio-film formation. We use a novel two-colour, three-dimensional Lagrangian tracking technique, to follow simultaneously the body and the flagella of a wild-type $Escherichiacoli$. We observe long surface residence times and surface escape corresponding mostly to immediately antecedent tumbling. A motility model accounting for a large behavioural variability in run-time duration, reproduces all experimental findings and gives new insights into surface trapping efficiency.

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• Collective behavior of squirmers in thin films
• Confinement reduces surface accumulation of swimming bacteria
• Optimal run-and-tumble in slit-like confinement
• Bacteria optimize tumble bias to strategically navigate surface constraints
• Active wetting transitions induced by rotational noise at solid interfaces
• Effects of Near-Field Hydrodynamic Interactions on Bacterial Dynamics Near a Solid Surface
• Detecting active Lévy particles using differential dynamic microscopy
• Morphological Effects on Bacterial Brownian Motion: Validation of a Chiral Two-Body Model