SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 44: Poster: Statistical Physics

DY 44.22: Poster

Donnerstag, 30. März 2023, 13:00–16:00, P1

Domain Drift and Diffusion in Cell-Polarization Processes — •Johannes Ewald and Jürgen Vollmer — Institute of Theoretical Physics, Universität Leipzig, Brüderstr. 16, D-04103 Leipzig, Germany

Cell polarization can be driven by the formation of signaling patterns on cell membranes. They can be modeled by two species of membrane proteins that can bind to cytosolic enzymes. The enzymes drive the conversion between cell membranes. These chemical reactions drive the coarsening of domains on the cell surface. Polarization amounts to the situation where the cell surface is covered by only two domains on opposing sides of the cell. Certain aspects of the domain coarsening are reminiscent to ripening of spin-up and spin-down domains in ferromagnets. In this analogy the conversion of membrane proteins takes the role of spin flips of the magnetic system. However, there are also distinct differences in the dynamics because the conversion is driven by a dissipative chemical reaction, while spin-flips arise due to thermal fluctuations. Based on the analytical solutions for domain drift and diffusion in the two models we will discuss differences and communalities of the processes.