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利用原子力显微镜(AFM)成像技术来观察DL-缬氨酸晶体表面分子的规则排列,研究表明对映体分子在DL-缬氨酸晶体中相互配对排列,每个晶胞单元中包含两个对映体分子,属于具有中心对称结构P1群,整个晶体是消旋的.通过原子力显微镜对DL-缬氨酸晶体表面重复单元的测量结果与X衍射数据对比,发现用AFM观察到的DL-缬氨酸晶体中分子表面形貌的规整排列的距离,同X衍射得出的三斜晶系晶胞参数数据基本一致,由此判定该晶体属于三斜晶系而不是单斜晶系.探讨了利用纳米技术的研究手段在分子水平研究生命起源中的手性问题,在确定的晶面上通过分子周期性结构排列规律,对DL-缬氨酸晶体表面分子进行手性识别.
Atomic force microscopy (AFM) imaging techniques were used to observe the regular arrangement of DL-valine crystal surface molecules. Studies have shown that enantiomeric molecules are paired with each other in DL-valine crystals and contain two pairs per unit cell The enantiomers belong to P1 group with central symmetry and the whole crystal is racemic.The measurement of repeating units of DL-valine crystal surface by atomic force microscope is compared with that of X-ray diffraction and found that DL-valleys observed by AFM The distance between the ordered arrangement of molecular surface topography and that of the triclinic unit cell determined by X-ray diffraction is basically the same, which indicates that the crystal belongs to the triclinic system rather than the monoclinic system. Using nanotechnology research methods to study chirality in the origin of life at the molecular level, the chiral recognition of DL-valine crystal surface molecules is performed on the determined crystal plane through the regular arrangement of molecular periodic structures.