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College of Sciences

 

Soft Matter Physics and Bacteria

Time: 
Tue, 04/30/2013 - 3:00pm

Series: Soft Condensed Matter and Biophysics

Location: 
Klaus 1116 East
Affiliation: 
UCLA

One of the long term challenges in human health and disease is the control of pathogens, such as antibiotic-resistant forms of bacteria. In this talk, we will briefly describe two directions where soft condensed matter physics based approaches have been useful.

1)     Bacterial biofilms are structured multi-cellular communities that are notoriously resistant to antibiotics. We translate bacteria movies into searchable databases of bacterial behavior via methods adapted from colloid physics, and find an unexpected diversity in motility driven by Type IV pili across different bacterial species.  The associated phenomena include ‘stick-slip’ motion analogous to earthquake dynamics, and self-organization in early biofilm development reminiscent of capitalist economies.

2)     We examine the mechanism of a range of pore-forming polypeptides, including antimicrobial peptides, cell penetrating peptides, viral fusion peptides, and apoptosis proteins, and show how a combination of geometry, coordination chemistry, and soft matter physics can be used to approach a unified understanding.