大型圆柱形磷脂囊泡的热涨落
Thermal fluctuations of large cylindrical phospholipid vesicles.
作者信息
Schneider M B, Jenkins J T, Webb W W
出版信息
Biophys J. 1984 May;45(5):891-9. doi: 10.1016/S0006-3495(84)84235-6.
Abstract
The time correlation function of the shape fluctuations of large (greater than 10 micron), cylindrical, hydrated, phospholipid-membrane vesicles consisting of one bimolecular layer was measured. The restoring force of the membrane was due to the excess curvature of a membrane element. A value for the curvature elastic modulus, Kc, was obtained from the mean-square amplitude of the normal modes of the fluctuations using the equipartition theorem. An expression for the correlation time was found by solving the dynamics of the membrane's relaxation against the low Reynolds number viscous drag of the surrounding fluid. The amplitudes and correlation times of the fundamental bending mode of the cylindrical vesicles both yield Kc = 1-2 X 10(-12) ergs.
摘要
测量了由一个双分子层组成的大尺寸（大于10微米）、圆柱形、水合磷脂膜囊泡形状波动的时间关联函数。膜的恢复力源于膜元件的过量曲率。利用均分定理，从波动的简正模的均方振幅获得了曲率弹性模量Kc的值。通过求解膜相对于周围流体的低雷诺数粘性阻力的弛豫动力学，找到了关联时间的表达式。圆柱形囊泡基本弯曲模式的振幅和关联时间均得出Kc = 1 - 2×10⁻¹²尔格。
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