This page summarizes earlier research work by Martin O. Steinhauser on polymer networks, cytoskeletal model systems, semiflexible filaments, and coarse-grained simulation of mechanically loaded networks. The central question was how the architecture and stiffness of filamentous networks influence their mechanical response.

The cytoskeleton of a eukaryotic cell consists of a complex network of protein filaments, including actin filaments, intermediate filaments, and microtubules. These structures help cells maintain shape, withstand mechanical stress, organize internal components, and respond to external forces. Their mechanical properties depend on filament stiffness, network connectivity, crosslinking, and spatial organization.

Figure 1 shows simulation snapshots of polymer-network structures under deformation. The different configurations illustrate how network architecture and filament properties influence the response to mechanical loading. Such simulations are useful for studying systems in which fully atomistic modeling would be computationally infeasible because of the large length scales involved.

Concept

The concept of this research line was to represent cytoskeletal structures by coarse-grained networks of semiflexible polymer chains. This makes it possible to study how persistence length, filament connectivity, excluded-volume interactions, and network topology affect mechanical behavior.

The model does not attempt to reproduce every molecular detail of a biological cell. Instead, it isolates physical mechanisms that are relevant for understanding the mechanics of filament networks. This allows one to connect polymer physics, soft-matter mechanics, and biological structure in a controlled simulation framework.