Abstract
The first lecture gave a general introduction to cell motility, presenting the general principles and various modes of cell motility for animal eukaryotic cells and bacteria. On a large scale, cell motion appears as a persistent random walk that can be described by the two classical models of the bacterial run and tumble and the random Brownian particle. The movement can be biased by several types of external field, the effect of which is grouped together under the name of " taxing phenomena ". The example of chemotaxis was dealt with in greater detail, presenting the classical models of Keller and Segel and H. Berg for bacteria. The lecture also looked at the sensitivity of chemotaxis to noise, and how cells process the signal from the chemoattractant concentration gradient into a movement that depends only on the gradient and not on the absolute value of the concentration.
