Abstract: In this paper, the influences of CH₂Cl₂, CHC₁₃ and CCl₄ on the liquid crystal structure of phosphatidythanolamine(PE) have been investigated by using the method of SAXS (the small angle X-ray scattering) respectively.The experimental results show the structure of the PEliquid crystal phase is primarily influenced by space-spinning electronic cloud density distribution of CH₂Cl₂, CHCl₃ and CCl₄.The compounds whose space-spinning electronic cloud density distribution assumes spinning oval ball in shape give the mechanism that makes the PEliquid crystal state to form hexagonal Iphase; The compounds whose space-spinning electronic cloud density distribution assumes spinning taper in shape give the mechanism that makes the PEliquid crystal state to form cubic-hexagonal phase.The compounds whose space-spinning electronic cloud density distribution assumes spinning ball in shape give the mechanism that makes the PEliquid crystal state to form lamemller-cube phase.

Key words: Biomembranes, Liquid crystal state, Small angle X-ray scattering (SAXS), Phos-phatidylthanolamine