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首页> 外文期刊>Journal of Experimental and Theoretical Physics >X-Ray Reflectometry of DMPS Monolayers on a Water Substrate
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X-Ray Reflectometry of DMPS Monolayers on a Water Substrate

机译：DMPS单层在水基质上的X射线反射测量测量测量

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摘要

The molecular structure of dimyristoyl phosphatidylserine (DMPS) monolayers on a water substrate in different phase states has been investigated by X-ray reflectometry with a photon energy of similar to 8 keV. According to the experimental data, the transition from a two-dimensional expanded liquid state to a solid gel state (liquid crystal) accompanied by the ordering of the hydrocarbon tails C14H27 of the DMPS molecule occurs in the monolayer as the surface pressure rises. The monolayer thickness is 20 +/- 3 and 28 +/- 2 in the liquid and solid phases, respectively, with the deflection angle of the molecular tail axis from the normal to the surface in the gel phase being 26A degrees +/- 8A degrees. At least a twofold decrease in the degree of hydration of the polar lipid groups also occurs under two-dimensional monolayer compression. The reflectometry data have been analyzed using two approaches: under the assumption about the presence of two layers with different electron densities in the monolayer and without any assumptions about the transverse surface structure. Both approaches demonstrate satisfactory agreement between themselves in describing the experimental results.
机译：通过X射线反射测定法研究了不同相位状态下水基质上的Divyristoyl磷脂酰磷丝氨酸（DMP）单层的分子结构，其光子能量与8keV类似的光子能量。根据实验数据，从二维膨胀液态状态转变为伴随着DMPS分子的烃尾C14H27的排序的固体凝胶状态（液晶），在单层上发生，随着表面压力升高。单层厚度分别在液体和固相中为20 +/- 3和28 +/- 2，分子尾轴的偏转角与凝胶相中的正常表面为26A +/- 8A程度。在二维单层压缩下也发生了极性脂质基团的水合度的两倍降低。已经使用两种方法分析了反射测量数据：在关于单层中具有不同电子密度的两层的假设，并且没有围绕横向表面结构的任何假设。两种方法都在描述实验结果时表现出令人满意的协议。

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    Tikhonov A. M.; Asadchikov V. E.; Volkov Yu. O.; Roshchin B. S.; Ermakov Yu. A.;

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    Russian Acad Sci Kapitza Inst Phys Problems Ul Kosygina 2 Moscow 119334 Russia;

    Russian Acad Sci Shubnikov Inst Crystallog Crystallog &

    Photon Fed Res Ctr Leninskii Pr 59 Moscow 119333 Russia;

    Russian Acad Sci Shubnikov Inst Crystallog Crystallog &

    Photon Fed Res Ctr Leninskii Pr 59 Moscow 119333 Russia;

    Russian Acad Sci Shubnikov Inst Crystallog Crystallog &

    Photon Fed Res Ctr Leninskii Pr 59 Moscow 119333 Russia;

    Russian Acad Sci Frumkin Inst Phys Chem &

    Electrochem Leninskii Pr 31 Moscow 119071 Russia;

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  • 中图分类 理论物理学;
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