[Todos] HOY: Coloquios DF - Fernando Peruani. 13.45 hs, Aula Federman, 1er piso, Pab. I

[Augusto Roncaglia]

COLOQUIOS DEL DEPARTAMENTO DE FÍSICA EXACTAS - UBA


              En el Aula Federman, 1er piso, Pab. I,

              Jueves 21/6, 13.45 hs (hasta las 14.45 hs):


              FERNANDO PERUANI

              Université Nice Sophia Antipolis


*Intermittent behavior across scales in biology*

Intermittent behavior is observed in biological systems at all scales, from
bacterial systems to sheep herds. First, I will discuss how Escherichia
coli explores surfaces by alternating stop and moving phases. Specifically,
I will show that a stochastic three behavioral state model is consistent
with the empirical data. The model reveals that the stop frequency of
bacteria is tuned at the optimal value that maximizes the diffusion
coefficient. These results provide a new perspective on how evolution may
have reshaped bacterial motility apparatus. Intermittent motion is also
observed in sheep, where again a stochastic three behavioral state model
provides a quantitative understanding of the empirical data. However, in
sheep, individual transition rates depend on the behavioral state of other
individuals and collective behaviors emerge. Specifically, I will show that
small sheep herds display highly synchronized intermittent collective
motion, with the herd behaving as a self-excitable system.
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