BENDING RIGIDITIES OF SOME BIOLOGICAL MODEL MEMBRANES AS OBTAINED FROM THE FOURIER-ANALYSIS OF CONTOUR SECTIONS
BENDING RIGIDITIES OF SOME BIOLOGICAL MODEL MEMBRANES AS OBTAINED FROM THE FOURIER-ANALYSIS OF CONTOUR SECTIONS
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DOI：
10.1051/jphys:019900051010099100
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发表时间：
1990-05-15
期刊：
影响因子：
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通讯作者：
HELFRICH, W
中科院分区：
文献类型：
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作者：
MUTZ, M;HELFRICH, W
我们测量了鸡蛋卵磷脂（EYPC）、二肉豆基磷脂酰乙醇胺（DMPE）和双半乳糖酰二酰基甘油（DGDG）膜在流体状态下的弯曲刚度kc，并对大的近平面双层截面的波动进行了计算机傅里叶分析。对于EYPC，我们发现kc= 0.8× 10-12 erg，这不到先前从管状囊泡的弯曲波动中得到的鸡蛋和其他卵磷脂值的一半，但在最近对球形卵磷脂囊泡的测量范围内。对于DMPE，我们发现在温度为60℃时kc= 0.7 x 10-12 erg，而在温度为46℃时，我们从二酰酰磷脂酰乙醇胺（DLPE）的管状囊泡的弯曲波动中得出kc= 1.7 x 10-12 erg。对于卵磷脂，不同的结果似乎主要是由于不同的方法。DGDG的kc=(0.12-0.27) × 10-12 erg值非常低。其他材料的散射较小，但也很大。
We have measured the bending rigidites kc of egg lecithin (EYPC), dimyristoylphosphatidyl-ethanolamine (DMPE) and digalactosyl-diacylglycerol (DGDG) membranes in the fluid state, subjecting the fluctuations of large nearly planar bilayer sections to computerized Fourier analysis. For EYPC we found kc= 0.8× 10-12 erg which is less than half the value obtained earlier for egg and other lecithins from the bending fluctuations of tubular vesicles but in the range of more recent measurements on spherical lecithin vesicles. For DMPE we found kc= 0.7 x 10-12 erg at T= 60 C, while we derived kc= 1.7 x 10-12 erg from the bending fluctuations of tubular vesicles of dilauroyl-phosphatildylethanolamine (DLPE) at T= 46 C. As in the case of lecithins the different results seem to be mostly due to the different methods. Very low values of kc=(0.12-0.27) x 10-12 erg were measured for DGDG. The scatter was less but also large for the other materials.