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| Hauptseite > Workflowsammlungen > Publikationsgebühren > Filamentous active matter: Band formation, bending, buckling, and defects |
| Hauptseite > Workflowsammlungen > Publikationsgebühren > Filamentous active matter: Band formation, bending, buckling, and defects |
| Journal Article | FZJ-2020-02037 |
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2020
Assoc.
Washington, DC [u.a.]
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Please use a persistent id in citations: http://hdl.handle.net/2128/25495 doi:10.1126/sciadv.aaw9975
Abstract: Motor proteins drive persistent motion and self-organization of cytoskeletal filaments. However, state-of-the-art microscopy techniques and continuum modeling approaches focus on large length and time scales. Here, we perform component-based computer simulations of polar filaments and molecular motors linking microscopic interactions and activity to self-organization and dynamics from the filament level up to the mesoscopic domain level. Dynamic filament cross-linking and sliding and excluded-volume interactions promote formation of bundles at small densities and of active polar nematics at high densities. A buckling-type instability sets the size of polar domains and the density of topological defects. We predict a universal scaling of the active diffusion coefficient and the domain size with activity, and its dependence on parameters like motor concentration and filament persistence length. Our results provide a microscopic understanding of cytoplasmic streaming in cells and help to develop design strategies for novel engineered active materials.
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