凝胶相二棕榈酰磷脂酰胆碱中部分旋转有序的证据。
Evidence of partial rotational order in gel phase DPPC.
作者信息
Nagle J F
机构信息
Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213.
出版信息
Biophys J. 1993 Apr;64(4):1110-2. doi: 10.1016/S0006-3495(93)81476-0.
Abstract
It is shown how the dichroic ratio of the symmetric methylene stretching modes depends upon both the rotational order of hydrocarbon chains about their long axis and the tilting of the long chains with respect to the bilayer normal. Use of a recent determination of the tilt angle from x-ray measurements together with recent dichroic infrared data yields a rotational order parameter g = -0.30 compared to g = 0 for complete disorder and g = +/- 1 for complete order. The negative value of g corresponds to a preference for the plane defined by the chain carbons to be more perpendicular than parallel to the plane defined by the tilt direction and the bilayer normal.
摘要
结果表明，对称亚甲基伸缩振动模式的二向色性比率如何取决于烃链围绕其长轴的旋转有序度以及长链相对于双层法线的倾斜度。利用最近通过X射线测量确定的倾斜角以及最近的二向色红外数据，得到的旋转有序参数g = -0.30，而完全无序时g = 0，完全有序时g = +/- 1。g的负值对应于链碳原子所定义的平面更倾向于垂直而非平行于由倾斜方向和双层法线所定义的平面。
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本文引用的文献
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