"Matière et Systèmes Complexes"
26 mai 2008 à 11h30
Bâtiment Condorcet, 4ème étage, salle 454 A.
Sensing changes in the environment is a fundamental property of living organisms. It allows them to respond and adapt to their new surroundings. In the case of bacteria the response can take different forms, such as, modifying their
gene-expression profile or altering their swimming pattern. We study the response of E-coli bacteria to a spatial variation of temperature.
We examine the temporal behavior of the culture under the temperature gradient and how it is affected by the bacterial density. The response to an oxygen gradient is also presented and in particular, the transition from aerobic to anaerobic.