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Fluctuation-magnification of non-equilibrium membranes near a wall

机译:壁附近非平衡膜的涨落放大率

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Membranes in thermal equilibrium are well known to exhibit Brownian motion type shape fluctuations. Membranes containing active force centers - such as chemically active membrane proteins - suffer additional non-equilibrium shape fluctuations due to the activity of these force centers. We demonstrate, using scaling arguments, that non-equilibrium shape fluctuations are in general greatly amplified by the presence of a nearby wall or membrane due to the absence of a fluctuation-dissipation theorem. For adhesive membranes, this fluctuation magnification effect may facilitate the establishment of bonding. For non-adhesive membranes, fluctuation magnification produces a long-range repulsive pressure which can exceed the well known Helfrich repulsion due to purely thermal fluctuations.
机译:众所周知,处于热平衡状态的膜表现出布朗运动型形状波动。包含主动力中心的膜(例如化学活性膜蛋白)会因这些力中心的活动而遭受其他非平衡形状波动。我们使用比例论证证明,由于不存在波动耗散定理,附近壁或膜的存在会极大地放大非平衡形状的波动。对于粘合膜,这种波动放大效应可以促进粘合的建立。对于非粘性膜,由于纯粹的热波动,波动放大倍数会产生远距离排斥压力,该压力可能会超过众所周知的赫尔夫里希排斥力。

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