The anisodamine interacts mainly with the polar head of the membrane lipid and affects the membrane fluidity.

山茛菪碱对红细胞膜脂的作用部位主要在极性头部，并影响膜脂的流动性。

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The polar head group is still extending parallel to the bilayer surface. Ginsenoside Rbl and Rh2 have significantly increased the fluidity of lipid bilayers.

各皂苷分子对不同结构的磷脂双层膜极性头部和疏水性尾部的作用也有差异。

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In a lipid bilayer, lipids arrange themselves, so that their polar head groups are exposed to water and their hydrophobic tails are sandwiched in the middle.

双分子层中，脂质可以自行排布，形成极性头部暴露在水中，疏水尾部夹在中间的结构。

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In the course of this reincarnation story, Beard manages to have his wife's research-student lover slip on a polar-bear rug, hit his head and die.

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Pyle, head of Arctic Sciences in the National Science Foundation's Office of Polar Programs.

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