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DY: Fachverband Dynamik und Statistische Physik

DY 15: Pattern Formation

DY 15.1: Vortrag

Dienstag, 2. April 2019, 10:00–10:15, H3

Spontaneous center formation in Dictyostelium discoideum — •Estefania Vidal-Henriquez and Azam Gholami — Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 17, D-37077 Göttingen, Germany

Dictyostelium discoideum (D.d.) is a widely studied amoeba due to its capabilities of development, survival, and self-organization. During aggregation it produces and relays a chemical signal (cAMP) which shows spirals and target centers. Nevertheless, the natural emergence of these structures is still not well understood. We present a mechanism for creation of centers and target waves of cAMP in D.d. by adding cell inhomogeneity to a well known reaction-diffusion model of cAMP waves and we characterize its properties. We show how stable activity centers appear spontaneously in areas of higher cell density with the oscillation frequency of these centers depending on their density. The cAMP waves have the characteristic dispersion relation of trigger waves and a velocity which increases with cell density. Chemotactically competent cells react to these waves and create branching aggregation streams even with very simple movement rules. Finally we argue in favor of the existence of a degradation which scales with local density to maintain the wave properties once small cell clusters appear in the high density streams.