Seminaires Phystat

Renseignements :


Jeudi 2 février 2012 à 14h30

Salle 201, Bât. 100, Université Paris Sud Orsay

Andreas Wagner

(University of Zurich)

The origins of evolutionary innovations

Life can be viewed as a four billion year long history of innovations. These range from dramatic macroscopic innovations like the evolution of wings or eyes, to a myriad molecular changes that form the basis of macroscopic innovations. We know many examples of such innovations -- qualitatively new phenotypes that provide an advantage to their bearer --, but we have no systematic understanding of the principles that allow organisms to innovate. Most phenotypic innovations result from changes in three classes of systems: metabolic networks, regulatory circuits, and protein or RNA molecules. I will discuss evidence that these classes of systems share two important features that are essential for their ability to innovate.

 


Lundi 9 janvier 2012 à 14h30

Salle Itzykson, IPhT Saclay

Florent Krzakala

(Physico-Chimie Théorique UMR CNRS Gulliver ESPCI)

Statistical physics approach to compressed sensing

Compressed sensing is triggering a major evolution in signal acquisition that changes completely the way we think about experiments and measurements. It indicates that most data, signals and images, that are usually