互变异构现象

观测到了酮-烯醇互变异构现象。

Ketone - enol tautomerism was observed .

这些衍生物活性分子在生物体中存在着互变异构现象，不同的异构体有不同的生物活性，这些异构体的相对稳定性和异构体之间的相互转变对其性质具有重要的影响。

But the tautomerism of these activity thio derivatives molecular can exist in biology systems and the different tautomers have variable activity effects .

发现了在不同pH介质中喹诺酮类药物的荧光波长和荧光强度的变化规律，并对喹诺酮类药物质子化作用及互变异构现象与荧光性质的相关性进行了考察。

Rules of wavelength and intensity of the fluorescence in different pH medium were discovered . The correlation between the protonation , tautomerism and luminescence characteristics of quinolone are studied . It is found that in pH 6-8 or 2-4 there are two luminescence species .

在模型的构建过程中，考虑了二酮酸类化合物的互变异构现象（酮式和烯醇式）、分子场、电荷以及叠合方式等因素对CoMFA模型的影响。

The influence of tautomerism ( enol and keto ) of DKAs , molecular field , charge , alignment rules and other factors on the CoMFA model were considered .

β-二酮类化合物存在着互变异构现象，是典型的烯醇-酮互变体系。其溶液体系的互变现象研究得比较透彻，而气相体系由于缺少研究手段，这方面的报道很少。

The tautomerism of β - keto esters is a typical system of enol-keto tautomerism , which has been thoroughly studied in liquid phase , yet less in gas phase , for lacking of effective techniques .

肽在生物体系中起着十分重要的作用。肽单元的互变异构平衡现象决定着许多生物分子的结构和功能。

The peptide plays a vital role in biological systems , and the tautomerization of the peptide unit is important for the determination of structures and functions of biological molecules .