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DY: Fachverband Dynamik und Statistische Physik
DY 32: Complex Fluids and Colloids, Micelles and Vesicles (joint session CPP/DY)
DY 32.9: Vortrag
Mittwoch, 18. März 2020, 11:45–12:00, ZEU 114
Charge regulation radically modifies electrostatics in membrane stacks — •Arghya Majee1, Markus Bier1,2, Ralf Blossey3, and Rudolf Podgornik4 — 1MPI for Intelligent Systems, Stuttgart & University of Stuttgart, Germany — 2University of Applied Sciences, Würzburg-Schweinfurt, Germany — 3University of Lille, CNRS, UMR8576 UGSF, France — 4CAS & KAVLI Institute of Theoretical Sciences, Beijing
Motivated by biological membrane-containing organelles in plants and photosynthetic bacteria, we study charge regulation in a model membrane stack [1]. Considering (de)protonation as the simplest mechanism of charge equilibration between the membranes and with the bathing environment [2], we uncover a symmetry-broken charge state in the stack with a quasiperiodic effective charge sequence. In the case of a monovalent bathing salt solution, our model predicts complex, inhomogeneous charge equilibria depending on the strength of the (de)protonation reaction, salt concentration, and membrane size. Our results shed light on the basic reorganization mechanism of thylakoid membrane stacks.
References:
[1] A. Majee, M. Bier, R. Blossey, and R. Podgornik, Phys. Rev. E 100, 050601(R) (2019).
[2] A. Majee, M. Bier, and R. Podgornik, Soft Matter 14, 985 (2018).