Regensburg 2019 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 17: Statistical physics of biological systems I (joint session BP/DY)
BP 17.8: Vortrag
Mittwoch, 3. April 2019, 17:00–17:15, H4
Active droplets can center internal particles — •David Zwicker1,2, Anthony Hyman3, and Frank Jülicher2 — 1Max Planck Institute for Dynamics and Self-Organization, Göttingen — 2Max Planck Institute for the Physics of Complex Systems, Dresden — 3Max Planck Institute of Cell Biological and Genetics, Dresden
Active droplets are non-equilibrium systems where chemical reactions drive fluxes of the droplet material. These fluxes can control the droplet nucleation as well as the droplet size and thereby stabilize many droplets against the typical coarsening observed in passive systems. Here, we study how the non-equilibrium fluxes affect solid particles inside such active droplets. We find that particles get centered when the droplet is maintained externally, while particles are expelled in the opposite case of autocatalytic droplets. In this case, only catalytically active particles can be centered. An example of such a situation are centrosomes in biological cells. Our theory thus accounts for the observed central positioning of centrioles and it generally provides a mechanism for controlling the morphology of active droplets.