Regensburg 2019 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 26: Active matter I (joint session BP/CPP/DY)
DY 26.9: Vortrag
Mittwoch, 3. April 2019, 12:00–12:15, H4
Modelling coordinated motion in simplest multicellular animals — •Stephan Meschede1 and Pawel Romanczuk2 — 1Department of Physics, Humboldt Universität zu Berlin — 2Institute for Theoretical Biology, Department of Biology, Humboldt Universität zu Berlin
Placozoa, Trichoplax adhaerens, are structurally simplest known multicellular animals. Their bodies are flat and irregular, up to few milimeters in diameter and 10−15 µ m thick [1]. They consists of three layers, an upper and a lower epithelium enclosing a fiber cell layer. The Trichoplax body plan is completely decentralized without any hierarchical structure or a central nervous system. However, they are capable of amoeba-like, coordinated active motion on substrates through ciliary locomotion. We show that individual Trichoplax motion behavior can be modeled as a two-dimensional ’sheet’ of active particles coupled through elastic forces, building upon previous models of cellular migration model proposed by Szabo et al [2]. We discuss the emergence of coordinated motion and the role of animal size and elastic coupling strength for the stochastic motility. Our aim is to understand how the self-organized active sheet dynamics shapes and constrains the motion behavior of these simple animals and their ability to navigate the environment.
[1]: Miller, D. J., & Ball, E. E. (2005). Animal Evolution: The Enigmatic Phylum Placozoa Revisited. Current Biology, 15(1), 26-28.
[2]: Szabó, B. et al.(2006). Phase transition in the collective migration of tissue cells: Experiment and model. Phys. Rev. E, 74(6), 1-5.