Filamentous Active Matter: Band Formation, Bending, Buckling, and Defects
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2019
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| _version_ | 1866909213694885888 |
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| author | Vliegenthart, Gerrit Ravichandran, Arvind Ripoll, Marisol Auth, Thorsten Gompper, Gerhard |
| author_facet | Vliegenthart, Gerrit Ravichandran, Arvind Ripoll, Marisol Auth, Thorsten Gompper, Gerhard |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_1902_07904 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Filamentous Active Matter: Band Formation, Bending, Buckling, and Defects Vliegenthart, Gerrit Ravichandran, Arvind Ripoll, Marisol Auth, Thorsten Gompper, Gerhard Soft Condensed Matter 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. |
| title | Filamentous Active Matter: Band Formation, Bending, Buckling, and Defects |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/1902.07904 |