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Confinement and activity regulate bacterial motion in porous media

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Abstract

Understanding how bacteria move in porous media is critical to applications in healthcare, agriculture, environmental remediation, and chemical sensing. Recent work has demonstrated that E. coli, which moves by run-and-tumble dynamics in a homogeneous medium, exhibits a new form of motility when confined in a disordered porous medium: hopping-and-trapping motility, in which cells perform rapid, directed hops punctuated by intervals of slow, undirected trapping. Here, we use direct visualization to shed light on how these processes depend on pore-scale confinement and cellular activity. We find that hopping is determined by pore-scale confinement, and is independent of cellular activity; by contrast, trapping is determined by the competition between pore-scale confinement and cellular activity, as predicted by an entropic trapping model. These results thus help to elucidate the factors that regulate bacterial motion in porous media, and could help aid the development of new models of motility in heterogeneous environments.

Graphical abstract: Confinement and activity regulate bacterial motion in porous media

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Publication details

The article was received on 26 Aug 2019, accepted on 13 Nov 2019 and first published on 14 Nov 2019


Article type: Paper
DOI: 10.1039/C9SM01735F
Soft Matter, 2019, Advance Article

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    Confinement and activity regulate bacterial motion in porous media

    T. Bhattacharjee and S. S. Datta, Soft Matter, 2019, Advance Article , DOI: 10.1039/C9SM01735F

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