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• W3104780500 abstract "Microbes routinely face the challenge of acquiring territory and resources on wet surfaces. Cells move in large groups inside thin, surface-bound water layers, often achieving speeds of 30 µm/s within this environment, where viscous forces dominate over inertial forces (low Reynolds number). The canonical Gram-positive bacterium Bacillus subtilis is a model organism for the study of collective migration over surfaces with groups exhibiting motility on length scales three orders of magnitude larger than themselves within a few doubling times. Genetic and chemical studies clearly show that the secretion of endogenous surfactants and availability of free surface water are required for this fast group motility. Here we show that: (i) water availability is a sensitive control parameter modulating an abiotic jamming-like transition that determines whether the group remains fluidized and therefore collectively motile, (ii) groups self-organize into discrete layers as they travel, (iii) group motility does not require proliferation, rather groups are pulled from the front, and (iv) flow within expanding groups is capable of moving material from the parent colony into the expanding tip of a cellular dendrite with implications for expansion into regions of varying nutrient content. Together, these findings illuminate the physical structure of surface-motile groups and demonstrate that physical properties, like cellular packing fraction and flow, regulate motion from the scale of individual cells up to length scales of centimeters." @default.
• W3104780500 created "2020-11-23" @default.
• W3104780500 creator A5020388926 @default.
• W3104780500 creator A5040082652 @default.
• W3104780500 creator A5076453871 @default.
• W3104780500 date "2019-07-30" @default.
• W3104780500 modified "2023-10-04" @default.
• W3104780500 title "Physical factors contributing to regulation of bacterial surface motility" @default.
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• W3104780500 doi "https://doi.org/10.1101/719245" @default.
• W3104780500 hasPublicationYear "2019" @default.
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