Dresden 2020 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 32: Focus Session: Nonlinear Dynamics of the Heart I (joint session DY/BP)
BP 32.4: Vortrag
Donnerstag, 19. März 2020, 10:30–10:45, ZEU 118
Dynamics of scroll waves in a cylinder jacket geometry — Christian Bruns1 and •Marcus Hauser2 — 1Institut für Biometrie und Medizinische Bioinformatik, Universität Magdeburg, Magdeburg, Germany — 2Insitut für Biologie, Universität Magdeburg, Magdeburg, Germany
The dynamics of scroll waves in a narrow cylinder jacket-shaped reactor is investigated experimentally by optical tomography using a chemical model system. The fate of the scroll waves of excitation in the Belousov-Zhabotinsky reaction depend on the thickness of the cylinder jacket. While at sufficiently wide cylinder jackets vertically oriented scroll waves remain stable, the probability that the filaments of the scrolls hit a lateral wall increase with the shrinking width of the cylinder jacket. This may lead to the rupture of the initial filament and pinning of the filament ends at the lateral walls. Filaments that pin to opposite lateral walls shrink and reorient to a horizontal orientation; such a reorientation corresponds to a transition from an intramural to a transmural scroll wave. The kinetics of the reorientation and shrinkage of the scrolls were studied. Furthermore, we find that no new filaments were generated upon collision of excitation waves at the side of the cylinder jacket opposite to the scroll wave. Thus, under the studied conditions, we do not observe any new generation of filaments due to a phenomenon like reentry.