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SUMMARY:E. coli superdiffusion and chemotaxis - Dr Franziska Matthäus (Un
 iversity of Heidelberg)
DTSTART:20100507T110000Z
DTEND:20100507T120000Z
UID:TALK24055@talks.cam.ac.uk
CONTACT:Dr Mark Miller
DESCRIPTION:E.coli bacteria have been observed to show super-diffusive mot
 ion in absence of chemical gradients. Super-diffusion is a very effective 
 search strategy in sparse environments and thus can give E. coli evolution
 ary advantage. Interestingly\, the super-diffusive behaviour\nseems to ari
 se from stochastic fluctuations in the concentration level of an enzyme re
 gulating the chemotactic response.  In this talk I will give a short intro
 duction to anomalous diffusion and show\, how super-diffusion can be deriv
 ed from a continuous-time random walk model.  Subsequently\, I will presen
 t a mathematical model of the E. coli chemotaxis signalling pathway where 
 additive noise can lead to a transition from classical to anomalous diffus
 ion.  Simulations of larger populations in different chemical landscapes w
 ill present a basis to discuss the benefits and drawbacks of this noise-in
 duced behaviour.
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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