Regensburg 2022 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 17: Membranes and Vesicles

BP 17.7: Vortrag

Mittwoch, 7. September 2022, 16:45–17:00, H13

Dynamics of active vesicles — Priyanka Iyer, Masoud Hoore, Thorsten Auth, Gerhard Gompper, and •Dmitry Fedosov — Institute of Biological Information Processing and Institute for Advanced Simulation, Forschungszentrum Juelich, Juelich 52425, Germany

Biological cells are able to generate intricate structures and respond to external stimuli, sculpting their membrane from inside. Simplified biomimetic systems can aid in understanding the principles which govern these shape changes and elucidate the response of the cell membrane under strong deformations. We employ simulations of vesicles enclosing active self-propelled particles to investigate different non-equilibrium shapes with tether-like protrusions and highly branched, dendritic structures. Furthermore, adhesive interactions between active particles and the membrane result in highly branched tethers at low particle activity, where the system exhibits 'pseudo-equilibrium' shapes. The resulting membrane fluctuations present anomalous behaviour at high adhesive strengths, as they show an initial decrease with increasing activity. The active particles show ordering at the membrane surface which initially increases with activity and then decreases. The obtained state diagram characterizes shapes of active vesicles for various conditions applied.