极性头

由于两亲分子有其特殊的极性头基，它在与离子的相互作用中，静电作用也是重要的一部分。

Because amphiphilic molecules have a polar head , the electrostatic interaction plays an important role on ions and film .

因此磷脂酶D是很有前景的催化剂，可合成具有各样生理功能的多种极性头基的新型磷脂，广泛应用于食品、化妆品和医药工业。

Thus , the secretory PLD is a promising catalyst for synthesizing new phospholipids possessing various polar head groups that show versatile physiological functions and may be utilized in food , cosmetics and pharmaceutical industries .

因OP分子的极性头基团位于空腔外，加合物带有亲水性的极性端，有利于加合物在水溶液中的分散，提高了βCD加合物的溶解度。

The inclusion complex carries a polar head group of OP and its solubility greatly increases in aqueous solution .

当超过9.50后，体系[OH-]增大，对CTAB极性头的竞争增强，因此，E随pH升高而减小。

While the pH value is upon 9.50 , the E is decreased with the pH increasing because more and more OH-compete with hyperoside for combining to CTAB polar terminal .

这种粘弹性体系的形成，是带不同电荷的极性头基之间静电作用的结果。（2）在等摩尔比例附近很窄的范围内，C16MPB与SDBS形成双水相。

This is due to the strong electrostatic interactions between the oppositely charged headgroups . ( 2 ) The system of C16MPB / SDBS forms ATPS within a narrow range near equimolar ratio .

探讨了最佳的取样条件（包括不同极性涂层的纤维头、样品量、平衡温度、平衡时间等）。

The optimum sampling conditions were investigated , including the polarity of fiber coating , sample amount , equilibrium temperature and time etc.

从总的取样效果考察，采用极性涂层的纤维头对卷烟烟丝香气成分的分析较为有利。

According to the total sampling effects , 65 μ m CW-DVB fiber is more desirable for the analysis of aroma constituents from cut tobacco of cigarettes .