Europhys. Lett, 48 (5), pp. 587-593 (1999)
Studies of sector formation in expanding bacterial colonies
I. Golding, I. Cohen and E. Ben-Jacob
Tel Aviv University, Tel Aviv 69 978, Israel
(received 26 May 1999; accepted in final form 1 October 1999)
PACS. 87.10+e - Biological and medical physics: General theory and mathematical aspects.
We study sector formation in expanding bacterial colonies grown on a substrate with low level of nutrient. Bursts of sectors are observed both during compact growth on soft agar and during branching growth on semi-solid agar. For theoretical studies of these bursts we employ two mathematical models we have used successfully in the past to study patterning of bacterial colonies: a discrete model and a continuous reaction-diffusion model. Using these models we investigate the amount of segregation achieved by a neutral mutation, as well as by mutations having some advantage over the wild type. We also study the effect of chemotaxis signaling on the sector formation.
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