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Physics of Complex Biosystems

Prof. Dr. Ulrich Schwarz

We specialize in using theoretical physics to understand cell mechanics and adhesion at a system level.
We integrate signal transduction, cytoskeletal dynamics, adhesion clusters, and the extracellular matrix, employing statistical and continuum mechanics, non-linear dynamics, and stochastic dynamics. Our research spans cellular to subcellular levels, including the assembly of supra-molecular complexes and multicellular contexts. Collaborating closely with experimental biophysics and cell biology groups, we develop a comprehensive framework for studying these complex systems.

Research Strategy

The BioQuant research group led by Ulrich Schwarz uses concepts and methods from theoretical physics to develop a systems-level understanding of cell mechanics and adhesion. Such a framework has to integrate the effects of signal transduction, cytoskeletal dynamics, molecular motor activity, adhesion cluster dynamics, and the extracellular matrix. The range of methods employed in our work is rather broad and profits from expertise in statistical physics, continuum mechanics (including elasticity and hydrodynamics), non-linear dynamics (including reaction-diffusion systems and control theory), and stochastic dynamics (including exact stochastic simulations).

Our interest on the cellular level also branches out to the subcellular level (assembly of supra-molecular complexes like myosin II minifilaments, clathrin coats, or viruses) and the multi-cellular context (cell monolayers, organoids, collective migration). In general, we collaborate closely with experimental groups from cellular biophysics and cell biology, for example in the context of traction force microscopy.

 

Overlay of an experimental image of an adherent cell and our network model for the cytoskeletal network. (Soine et al. PLoS Comput Biol. 2015).

Current Activities

  • Forces and elasticity in cell adhesion
  • Traction force microscopy
  • Cell shape in structured environments
  • Mechanics and regulation of the actin cytoskeleton
  • Biophysics of the malaria parasite
  • Virus uptake, assembly and spread
  • Physics of tissue
  • Stochastic dynamics of adhesion clusters
  • Cell capture and rolling in hydrodynamic flow
  • Self-assembly of supramolecular complexes
Schwarz SW
Prof. Dr. Ulrich Schwarz

Selected Publications

Optimal ligand discrimination by asymmetric dimerization and turnover of interferon receptors.

Patrick Binder, Nikolas D. Schnellbächer, Thomas Höfer and Ulrich S. Schwarz

Proc Nat Acad Sci. 2021


Distinct roles of nonmuscle myosin II isoforms for establishing tension and elasticity during cell morphodynamics.

Kai Weißenbruch, Justin Grewe, Marc Hippler, Magdalena Fladung, Moritz Tremmel, Kathrin Stricker, Ulrich Sebastian Schwarz and Martin Bastmeyer

Elife. 2021 Aug 10:10:e71888.


Electrostatic and bending energies predict staggering and splaying in nonmuscle myosin II minifilaments.

Tom L Kaufmann and Ulrich S Schwarz

PLoS Comput Biol.2020 Jul 6;16(7):e1007801.