Chemistry Seminar Series: Professor Edward LymanExport this event to calendar

Wednesday, November 14, 2012 — 2:30 PM EST

Simulating liquid-liquid phase separation and lipid transport on the Anton special purpose machine.

Professor Edward Lyman
Department of Physics
University of Delaware

Wednesday, November 14, 2012
2:30 p.m.
C2-361 (Reading Room)

Abstract: We present simulation data for a bilayer composed of a ternary mixture of cholesterol, dioloeoyl phosphatidylcholine and dipalmitoyl phosphatidylcholine. The composition is chosen to be in the two-phase region and the temperature in the vicinity of the miscibility transition. Using the Anton special purpose computer to generate continuous trajectories longer the ten microseconds - which admits complete mixing of the lipids - we observe robust liquid-liquid phase coexistence. The time-and ensemble-averaged mean squared displacement (MSD) displays anomalous scaling on timescales less than 50 nsec and normal diffusion on longer timescales. The short-time anomalous scaling is explained by a mode-coupling argument[Flenner et al Phys Rev E 79:011907(2009)]. The per-lipid MSD's suggest that a few lipids remain associated with the liquid ordered domain for the duration of the simulation, suggesting a possible mechanism for anomalous transport on experimentally accessible timescales.

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