Filamentous Active Matter: Band Formation, Bending, Buckling, and Defects
| Autor: | Vliegenthart, Gerrit, Ravichandran, Arvind, Ripoll, Marisol, Auth, Thorsten, Gompper, Gerhard |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Science Advances 6, eaaw9975 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1126/sciadv.aaw9975 |
| Popis: | Motor proteins drive persistent motion and self-organisation of cytoskeletal filaments. However, state-of-the-art microscopy techniques and continuum modelling 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-organisation and dynamics from the two-filament level up to the mesoscopic domain level. Dynamic filament crosslinking 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. Comment: 6 Figures |
| Databáze: | arXiv |
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