any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons

if the alkyl group length was larger than 11c, the self-assembled film would induce vertical alignment.

实验发现，当自组装膜烷烃碳链长度大于11个c原子就可获得垂直取向。

where evm is the sum of eigenvalue of bonding orbital-connection matrix of the alkyl group and pei is the polarizibility of alkyl.

evm为醇中烷基的键连接矩阵特征根之和，pei为烷基的极化效应指数。

result showed that dialkyl quaternary ammonium salts inhibited the growth of aeromonas hydrophila and flexibacter colnmnaris, and the short alkyl group is more effective than the long one.

结果表明，双烷基季铵盐对嗜水气单胞菌和柱状屈桡桿菌生长均具有一定抑制作用，且短链双烷基季铵溴盐比长链的抑菌效果好。

with increasing number of carbon atom of alkyl group in the ionic liquid the extraction efficiency of lithium obviously increased.

锂的萃取率随离子液体中烷基碳原子数的增加而增加。

a process in which an alkyl group is added to or substituted in a compound, as in the reaction of alkenes with alkanes to make high-octane fuels.

烷化作用，烷基取代向一种化合物中添加或用一个烷基团替代的过程，如用烯烃和烷烃发生反应以制得。

on the other had the chain length of alkyl group also affects on the values of at as well.

同时还发现吸附质的链长对脱附性质、at值也有较大影响。

conclusion introducing the methyl group or a low alkyl group resulting in the high selectivity and increase of its activity.

结论甲基或低级烷基的引入导致了高选择性，使其活性增大。

r2 represents a branched or unbranched alkyl group with 5 to 17 carbon atoms;

r2表示支化或未支化的具有5-17个碳原子的烷基；