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- W72331102 abstract "The macroscopic properties, the properties of individual components, and how those components arrange themselves are three important aspects of a complex structure. Knowing two of them will provide us information of the third. Here we perform a theoretical study of a composited system that is slender and can be coarse-grained as a simple smooth 3-dimensional curve. Focusing on biological systems, especially the cytoskeletal networks, we show how the combination of the properties of the network and the individual components puts constraints on the local configurations and dynamics. When the network can be modeled as a single linear chain, similar as single polymer chains, its overall conformation is dominated by the competition between the internal energy and the thermal agitations. The conformational fluctuations of a composited chain reveal not only its elastic properties but also the local arrangements and dynamics of its components. We first show a general form of the internal energy of a coarse-grained composited chain, and discuss briefly how it is related to existing models and may contribute to building new models. Under certain limits this general expression of energy is reduced to the worm-like chain (WLC) model. Using this simplified energy in the strong-stretching limit, we obtain analytical solutions for all the cumulants of the end-to-end distance projected to the force direction. Finally we apply our results to recent experimental observations that revealed the hitherto unknown periodic cytoskeleton structure of axons and measured the longitudinal fluctuations, and show how the comparison between our results and experiments limits possible local configurations and dynamics of the spectrin tetramers in the axonal cytoskeleton." @default.
- W72331102 created "2016-06-24" @default.
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- W72331102 date "2013-12-04" @default.
- W72331102 modified "2023-09-27" @default.
- W72331102 title "Local configurations and dynamics revealed by the elastic properties of the composited chain and its components" @default.
- W72331102 hasPublicationYear "2013" @default.
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