互变异构

A major class of tautomeric reactions involves exchange of a hydrogen atom between two other atom s in the same molecule, in both cases forming a covalent bond.

一类主要的互变异构反应是氢原子在两个其它原子间交换，与任何一方都生成共价键。

A major class of tautomeric reaction s involves exchange of a hydrogen atom between two other atoms in the same molecule, in both cases forming a covalent bond.

一类主要的互变异构反应是氢原子在两个其它原子间交换，与任何一方都生成共价键。

Meanwhile, our calculations suggest that the tautomeric equilibrium should be via the same intermediate.

同时，各互变异构体可能经过同一中间体。

Resembles thymine, but easily interconverts to tautomeric form that pairs with guanine.

与胸腺嘧啶相似，但很容易转换成与鸟嘌呤配对的互变异构形式。

The estimated tunneling probability of the H13 proton from one well to another well shows that the life time of the proton staying in one of these wells is about 6×10^2 a. It is too long to let tautomers of cytosine be in thermodynamical equilibrium in a room temperature gas phase experiment.

估算出的H13质子从一个势阱到另一个势阱的穿透几率表明质子呆在其中一个势阱中的寿命大约是6×10^2 a，这使胞嘧啶和它的顺式亚胺式互变异构体在室温气相实验中远不能达到热平衡。

All the molecular complexes, obtained by the interaction between several low-lying tautomers of RNA nucleic acid and Ca^＋ on the different binding sites, were considered.

通过考虑Ca^＋作用于RNA碱基互变异构体的不同位置，获得了所有稳定的复合物。

The preference conformations of 10 possible tautomers of 5-fluorocytosine were calculated by the BH-HLYP/6-311+G(superscript **) method, in both the gas and aqueous phases, with full geometry optimization.

采用BH-HLYP/6-311+G方法对10种气相和水相中可能存在的5-氟胞嘧啶互变异构体进行了几何全优化，并计算出它们的总能量和吉布斯自由能。

The preference conformations of 10 possible tautomers of 5-fluorocytosine were calculated by the BH-HLYP/6-311＋G** method, in both the gas and aqueous phases, with full geometry optimization.

采用BH-HLYP/6-311＋G**方法对10种气相和水相中可能存在的5-氟胞嘧啶互变异构体进行了几何全优化，并计算出它们的总能量和吉布斯自由能。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！