Thermal undulations of quasi-spherical vesicles stabilized by gravity
Thermal undulations of quasi-spherical vesicles stabilized by gravity
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DOI：
10.1140/epje/i2002-10091-3
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发表时间：
2002-11-01
影响因子：
1.8
通讯作者：
Ipsen, JH
中科院分区：
文献类型：
--
作者：
Henriksen, JR;Ipsen, JH
准球形囊泡起伏的经典治疗，在目前的工作中，进行了审查和扩展到系统，这是由跨膜的密度差引起的重力场的影响。的影响进行了研究，通过使用微扰理论，导致修正的平均形状和波动的相关矩阵。这些修正已经包括在闪烁光谱的分析表达式中，以探测实验上可获得的光谱如何随重力变化。结果用引力参数g（0）= DeltapgR（4）/k表示。在大多数实验情况下，引力的贡献很小，因此可以忽略不计，但对于超过一定限度的go值，必须包括微扰修正。闪烁光谱的相对误差的表达式已经制定出来，因此，它是可能的，以定义的制度，重力是可以忽略不计的。还确定了go的上限，其中由于平均形状的失真，闪烁光谱的所有模式中的误差都很大。
The classical treatment of quasi-spherical vesicle undulations has, in the present work, been reviewed and extended to systems, which are affected by a gravitational field caused by a density difference across the membrane. The effects have been studied by the use of perturbation theory leading to corrections to the mean shape and the fluctuation correlation matrix. These corrections have been included in an analytical expression for the flicker spectrum to probe how the experimentally accessible spectrum changes with gravity. The results are represented in terms of the gravitational parameter, g(0) = DeltapgR(4)/k. The contributions from gravity are in most experimental situations small and thus negligible, but for values of go above a certain limit, the perturbational corrections must be included. Expressions for the relative error on the flicker spectrum have been worked out, so that it is possible to define the regime where gravity is negligible. An upper limit of go has also been identified, where the error in all modes of the flicker spectrum is significant due to distortion of the mean shape.