Abstract
An analysis of spatio-temporal pattern created by self-organization is one of important problems in complex systems. Among many spatio-temporal patterns created by self-organization, focusing on chemotactic bacterial colony patterns formed by Escherichia coli (E. coli) and Salmonella typhimurium (S. typhimurium), the colony formation processes are analyzed. The bacteria E. coli and S. typhimurium move towards higher concentration of chemoattractant or lower concentration of chemorepellent. This property of bacteria is called chemotaxis. Taking the fluctuation such as impurities in chemical substance into consideration, the influence of the fluctuation on the bacterial colony formations is studied by numerical simulations.
