# Dresden 2006 – wissenschaftliches Programm

## Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

# AKB: Biologische Physik

## AKB 2: Membranes: Conformations and Dynamics

### AKB 2.1: Vortrag

### Montag, 27. März 2006, 10:30–10:45, ZEU 260

**Stresses and torques in biological fluid membranes** — •Martin Michael Müller^{1}, Markus Deserno^{1}, and Jemal Guven^{2} — ^{1}Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany — ^{2}Instituto de Ciencias Nucleares, UNAM, Apdo. Postal 70-543, 04510 México D.F., Mexico

Forces in fluid membranes can be described with the help of the covariant surface stress tensor, in analogy to classical elasticity theory. Additionally, torques can be written in terms of the surface torque tensor.

In the context of interface mediated interactions, such as the interaction between protein inclusions in a lipid membrane, it has proven advantageous to use this approach: nonlinear expressions for the force and, in some cases, also the sign of the interaction could be derived [1]. The condition of torque balance imposes further restrictions on the solution. Other complications, such as a pressure difference between the two sides of the membrane or a lipid tilt, are readily included in the formalism.

[1] M. M. Müller, M. Deserno, and J. Guven, Europhys. Lett. **69**, 482 (2005).