An analysis of the X-ray interchain peak profile in dipalmitoylglycerophosphocholine.
An analysis of the X-ray interchain peak profile in dipalmitoylglycerophosphocholine.
复制标题
二棕榈酰甘油磷酸胆碱的 X 射线链间峰轮廓分析。
DOI：
10.1016/0005-2736(77)90001-3
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
D. B. Fein
中科院分区：
文献类型：
--
作者：
G. Brady;D. B. Fein
测定了表征双棕榈酰甘油磷酸胆碱膜中链间结构的x射线峰谱随温度的变化。在23 ~ 34.6°C之间的散射以不对称晶体反射为特征，占总强度的85%，其余15%为液体状。在转变前温度为34.6℃时，反射曲线变得（几乎）对称，表明链相对于膜表面的倾斜角发生了变化。这种变化伴随着液态散射量增加20%，表明过渡前机制包括链的部分熔化。在熔点41.5℃时，晶体反射消失，散射的液体分量增加到包含所有散射强度的点。给出了各温度下综合强度的相对值，并讨论了峰宽和峰形的意义。
The primary X-ray peak profile characterizing the interchain structure in the dipalmitoylglycerophosphocholine membrane has been measured as a function of temperature. The scattering between 23 and 34.6° C is characterized by an asymmetric crystalline reflection accounting for 85% of the total intensity, the remaining 15% being liquid-like in character. At a pre-transition temperature of 34.6° C, the reflection profile becomes (nearly) symmetrical, indicating a change in tilt angle of the chains with respect to the membrane surface. This change is accompanied by an increase of 20% in the amount of liquid-like scattering, indicating that the pre-transition mechanism includes a partial melting of the chains. At the melting point, 41.5° C, the crystalline reflection disappears, and the liquid component of the scattering increases to a point where it includes all the scattered intensity. The relative values of the integrated intensities at each temperature are tabulated, and the significance of the peak widths and shapes are discussed.