2024-08-20 ミュンヘン大学(LMU)
<関連情報>
- https://www.lmu.de/en/newsroom/news-overview/news/biophysics-from-filament-pick-up-sticks-to-active-foams.html
- https://journals.aps.org/prx/abstract/10.1103/PhysRevX.14.031031
アクティブモーターフィラメント系における超分子集合体: ミセル、二層膜、発泡体 Supramolecular Assemblies in Active Motor-Filament Systems: Micelles, Bilayers, and Foams
Filippo De Luca, Ivan Maryshev, and Erwin Frey
Physical Review X Published: 19 August 2024
DOI:https://doi.org/10.1103/PhysRevX.14.031031
Abstract
Active matter systems evade the constraints of thermal equilibrium, leading to the emergence of intriguing collective behavior. A paradigmatic example is given by motor-filament mixtures, where the motion of motor proteins drives alignment and sliding interactions between filaments and their self-organization into macroscopic structures. After defining a microscopic model for these systems, we derive continuum equations, exhibiting the formation of active supramolecular assemblies such as micelles, bilayers, and foams. The transition between these structures is driven by a branching instability, which destabilizes the orientational order within the micelles, leading to the growth of bilayers at high microtubule densities. Additionally, we identify a fingering instability, modulating the shape of the micelle interface at high motor densities. We study the role of various mechanisms in these two instabilities, such as contractility, active splay, and anchoring, allowing for generalization beyond the system considered here.
