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• W3100288229 abstract "Swarming colonies of the light responsive bacteria Serratia marcescens grown on agar exhibit robust fluctuating large-scale collective flows that include arrayed vortices, jets, and sinuous streamers. We study the immobilization and quenching of these large-scale flows when the moving swarm is exposed to light with a substantial ultra-violet component. We map the response to light in terms of two independent parameters - the light intensity and duration of exposure and identify the conditions under which mobility is affected significantly. For small exposure times and/or low intensities, we find collective mobility to be negligibly affected. Increasing exposure times and/or intensity to higher values temporarily suppresses collective mobility. Terminating exposure allows bacteria regain motility and eventually reestablish large scale flows. For long exposure times or at high intensities, exposed bacteria become paralyzed, with macroscopic speeds eventually reducing to zero. In this process, they form highly aligned, jammed domains. Individual domains eventually coalesce into a large macroscopic domain with mean radial extent growing as the square root of exposure time. Post exposure, active bacteria dislodge exposed bacteria from these jammed configurations; initial dissolution rates are found to be strongly dependent on duration of exposure suggesting that caging effects are substantial at higher exposure times. Based on our experimental observations, we propose a minimal Brownian dynamics model to examine the escape of exposed bacteria from the region of exposure. Our results complement studies on planktonic bacteria and inform models for pattern formation in gradated illumination." @default.
• W3100288229 created "2020-11-23" @default.
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• W3100288229 date "2018-05-27" @default.
• W3100288229 modified "2023-09-27" @default.
• W3100288229 title "Quenching an active swarm: Effects of light exposure on collective motility in swarmingSerratia marcescenscolonies" @default.
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• W3100288229 doi "https://doi.org/10.1101/331801" @default.
• W3100288229 hasPublicationYear "2018" @default.
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