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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Buckling, stiffening, and negative dissipation in the dynamics of a biopolymer in an active medium
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Buckling, stiffening, and negative dissipation in the dynamics of a biopolymer in an active medium

机译：活性介质中生物聚合物动力学的屈曲，变硬和负耗散

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摘要

We present a generic theory for the dynamics of a stiff filament under tension, in an active medium with orientational correlations, such as a microtubule in contractile actin. In sharp contrast to the case of a passive medium, we find the filament can stiffen, and possibly oscillate or buckle, depending on both the contractile or tensile nature of the activity and the filament-medium anchoring interaction. We also demonstrate a strong violation of the fluctuation-dissipation (FD) relation in the effective dynamics of the filament, including a negative FD ratio. Our approach is also of relevance to the dynamics of axons, and our model equations bear a remarkable formal similarity to those in recent work [Martin P, Hudspeth AJ, Juelicher F (2001) Proc Natl Acad Sci USA 98:14380-14385] on auditory hair cells. Detailed tests of our predictions can be made by using a single filament in actomyosin extracts or bacterial suspensions.
机译：我们提出了一种普通的理论，用于在具有定向相关性的活性介质（如收缩性肌动蛋白中的微管）中处于张力下的硬丝动力学。与被动介质的情况形成鲜明对比的是，我们发现细丝会变硬，甚至可能振荡或弯曲，这取决于活动的收缩或拉伸性质以及细丝与介质的锚固相互作用。我们还证明了在灯丝的有效动力学中强烈违反波动-耗散（FD）关系，包括负FD比。我们的方法也与轴突的动力学相关，并且我们的模型方程与最近的工作有着显着的形式相似性[Martin P，Hudspeth AJ，Juelicher F（2001）Proc Natl Acad Sci USA 98：14380-14385]。听觉毛细胞。我们的预测的详细测试可以通过在肌动球蛋白提取物或细菌悬浮液中使用一根细丝来进行。

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    Norio Kikuchi; Allen Ehrlicher; Daniel Koch; Josef A. Kaes; Sriram Ramaswamy; Madan Rao;

  • 作者单位

    Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560 012, India;

    Translational Medicine, Brigham and Women's Hospital, Harvard Medical School, One Blackfan Circle, Karp 6, Boston, MA 02115;

    Institute of Soft Matter Physics, Universitaet Leipzig, Linnestrasse 5, 04103 Leipzig, Germany;

    Institute of Soft Matter Physics, Universitaet Leipzig, Linnestrasse 5, 04103 Leipzig, Germany;

    Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560 012, India Condensed Matter Theory Unit, Jawaharlal Nehru Center for Advanced Scientific Research, Bangalore 560 064, India;

    Raman Research Institute, C.V. Raman Avenue, Bangalore 560 080, India National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bellary Road, Bangalore 560 065, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    cytoskeleton; active hydrodynamics; microrheology; fluctuation-dissipation ratio; neuronal growth cone;

    机译：细胞骨架主动流体力学微流变学波动耗散比;神经元生长锥;

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