%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% W. G. Pritchard Lab Seminar: 4:00-5:00 PM, 320 Whitmore Laboratory **Tuesday December 7, 2004** Biopolymer bundles Philip Pincus Department of Physics / Materials Research Laboratory University of California Santa Barbara Abstract: Semi-flexible polyelectrolyte biopolymers, such as DNA, f-actin, microtubules, self-assemble into finite size bundles under the influence of multi-valent counterions and specific associating proteins. We shall review and discuss the physics of this phenomenon in the context of a Rayleigh instability and counterion condensation. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%