Colloquium Schedule

Colloquium: Thursday, October 23, 4:10 PM, Lewis Lab 316

Bacteria as Active Colloids

Wilson Poon

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.

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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.        

August 28Alexander BalaeffUniversity of Central FloridaMechanics of a DNA Molecule: Structural Transition Under Applied Stress
September 4Roger CudneyCICEXE, MexicoOptical Devices Made with Ferroelectric Domains in Lithium Niobate
September 11Rene EssiambreBell Labs, Alcatel-LucentThe Limits of Optical Fibers to Transmit Information
September 18Na Young KimStanford UniversityMicrocavity Exciton-Polariton Condensation: Past, Present, and Future
September 25Liangcheng ZhouPrinceton UniversityFrom Lab to Fab: 3D Nanostructure Engineering on a Large Scale for Innovative Applications
October 2Harold KimGeorgia TechStatistical Mechanics of Small DNA Loops
October 9Waseem BakrPrinceton UniversitySynthetic Quantum Matter with Ultra Cold Atoms
October 16Yan Li
(additional website)
Brookhaven National LaboratoryCharacterization and Understanding Interactions at Material Interfaces from First-Principles Calculations
October 23Wilson PoonUniversity of EdinburghBacteria as Active Colloids
October 30Anatoli GlushchenkoUniv. of Colorado, Colorado Springs-
November 6Anatoli PolkovnikovBoston University-
November 13Charles BeichmanNASA-
November 20Aseet MukherjeeFermi Lab-
November 27No ColloquiumThanksgiving 
December 4Kerstin PerezHaverford College-
December 11No ColloquiumFinal Exams-