Colloquium: Thursday, October 23, 4:10 PM, Lewis Lab 316
Bacteria as Active Colloids
School of Physics and Astronomy
University of Edinburgh
The vast majority of bacteria are colloidal in size. However, they are active colloids - they dissipate energy to grow, divide and (sometimes) swim. I will introduce the study of bacterial suspensions as 'active colloids', a subfield of the emerging discipline of 'active matter physics'. The first part focuses on swimming. A number of phenomena in suspensions of swimming bacteria have analogues in the world of passive colloids, e.g. a kind of 'sedimentation equilibrium', but with a very high 'effective temperature'. Other phenomena are unique, e.g. they fill up a spherical cavity in a very different manner from how passive particles would do it. The second part focuses on growth, in particular, how a growing 2D colony of rod-shaped bacteria may fruitfully be viewed as a 'living nematic liquid crystal', and preliminary findings on their spontaneous buckling into the third dimension when the colony riches a critical size.
Physics and Astronomy Colloquia are usually scheduled for Thursdays at 4:10 PM in Lewis Lab room 316. Refreshments and snacks are available in the nearby coffee room at 3:45 PM.
Physics Colloquium Schedule for FALL 2014
Click on Title below for past or upcoming Announcements (where available), and Speaker name for website.