Mutual adhesion of lecithin membranes at ultralow tensions
Mutual adhesion of lecithin membranes at ultralow tensions
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超低张力下卵磷脂膜的相互粘附
DOI：
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发表时间：
1989
期刊：
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通讯作者：
W. Helfrich
中科院分区：
文献类型：
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作者：
R. Servuss;W. Helfrich
我们提出了一个广泛的光学显微镜研究的相互粘附的鸡蛋（和二肉豆蔻酰）卵磷脂双层在高度膨胀的样品，包括粘附所带来的渗透膨胀的囊泡。与粘附相关的横向张力，如果低于约。3 x 10-4 dyn cm-1，可以从接触区域旁边的膜的圆形读取。对称粘附的接触角，即两个膜在相等张力下的接触角，最大为45°。虽然显示出一些分散，但它似乎不依赖于低至3 x 10-6 dyn cm-1的张力，这是观察到的最低张力。单膜与膜束的最大接触角接近70°。数据表明，卵磷脂膜的相互粘附总是由侧向张力引起的。恒定的接触角似乎是兼容的波动理论，但其幅度迫使我们假设一个未知的，光学上无法分辨的粗糙度卵磷脂膜，作为一个区域水库。
We present an extensive light-microscopic study of mutual adhesion of egg (and dimyristoyl) lecithin bilayers in highly swollen samples, including adhesion brought about by osmotic inflation of vesicles. The lateral tensions associated with adhesion, if below ca. 3 x 10-4 dyn cm-1 , could be read from a rounding of the membrane next to the contact area. The contact angle of symmetric adhesion, i.e. of two membranes under equal tension, had a maximum of 45°. While showing some scatter, it did not seem to depend on tension down to 3 x 10-6 dyn cm-1, the lowest tension observed. The maximum contact angle of single membranes adhering to bundles of membranes was near 70°. The data indicate that mutual adhesion of lecithin membranes is always induced by lateral tension. The constancy of the contact angles appears to be compatible with undulation theory, but their magnitude compels us to postulate an unknown, optically unresolvable roughness of lecithin membranes which serves as an area reservoir.