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A new experimental colonial pattern and pattern transition observed in E.coli MG1655 swarming cells grown on semi-solid agar are described. We present areaction-diffusion model that, taking into account the slime generated by thesecells and its influence on the bacterial differentiation and motion, reproducesthe pattern and successfully predicts the observed changes when the colonialcollective motility is limited. In spite of having small non-hyperflagellatedswarming cells, under these experimental conditions E. coli MG1655 can veryrapidly colonize a surface, with a low branching rate, thanks to a strong fluidproduction and a local incremented density of motile, lubricating cells.Comment: 6 pages, 17 figure

Reaction-diffusion model for pattern formation inE. coliswarming colonies with slime