查询词典 isomers

Use of stereoselective or stereospecific synthetic methods or separation of racemic mixtures can be used to obtain individual optical isomers.

可以使用立体选择或立体专一的合成方法，或者外消旋混合物的分离，来获得单独的光学异构体。

Using THz absorption spectra can distinguish different kinds of amino acids, enantiomers and racemic compounds and structure isomers.

这一研究对建立氨基酸THz谱数据库，及其在氨基酸的手性对映体、结构和成分的区别方面有很重要的理论与实践意义。

Sebacic acid, decanedioic acidA mixture of xylene isomers used as a solvent in making lacquers and rubber cement and as an aviation fuel.

二甲苯混合物一种用作溶剂的含有二甲苯的混合物，用来制作漆和橡胶黏合剂，以及航空燃料

The polyaniline hybrid materials doped with cobalt substituted silicotungstate isomers α,β-Kβ(subscript 6-n)H[SiW11Co(H2O)O39]xH2O β(subscript i=β1,β2,β3 have been prepared.

以Keggin结构钴取代杂多硅钨酸盐异构体α，β-K(下标 6-n)H[SiW11Co(H2O)O39]xH2Oβ(下标 i=β1，β2，β3为掺杂剂，采用固相合成法制备了4种聚苯胺掺杂材料。

The bioassays showed that the inhabitation rate of the mixture of two isomers, Z isomer and E isomer were reached 95 %, 100% and 97% against Sphaerotheca fuliginea at 50 mg/L.

结果表明，当处理剂量为50mg／L时，氯苯肟唑、Z-氯苯肟唑和E-氯苯肟唑的防效分别为95％、100％和97％，三者活性基本相当，故在实际中无须将两个异构体分离，混合体可直接应用。

Draw and give the stereochemical designation for the geometric isomers of 2,4-hetpadiene.

答：画出2，4-二庚烯的异构体的构型式

Besides these, the steric bulk was also important for the separation of the isomers of camptothecin synthetic intermediate.

此外， 空间位阻在喜树碱中间体的光学异构体分离中也起了一定的作用。

Comparisons between the experimental and computational IR spectra clarify the difference of the open- and closed-ring isomers, which indicate that it is possible to identify the tautomeric form of this diarylethene derivative using a highly selective infrared absorption band and the strong absorption at 1 705 cm-1 of the ring-closed isomer can be used in non-destructive readout by IR light.

通过红外吸收光谱表征了该光致变色二芳基乙烯衍生物在溶液中开、关环前后结构的变化，并采用理论化学计算方法研究了该化合物开、关环异构体的红外吸收振动特性。光致变色异构化过程可以通过红外吸收光谱的变化而识别。关环异构体在1 705 cm

The total energy, standard enthalpy, standard entropy and standard free energy were obtained. The calculations show that 5-fluorouracil and 5-chlorouracil existing as the dione forms are the predominant isomers in the gas and aqueous phases. The entropy effect on the Gibbs free energy of 5-fluorouracil and 5-chlorouracil is very small and there is little significance for the tautomeric equilibria.

Onsager反应场溶剂模型用于水相的计算计算结果表明，5-氟尿嘧啶和5-氯尿嘧啶在气相中和水相中主要以双酮形式存在5-氟尿嘧啶和5-氯尿嘧啶的熵效应小，对互变异构平衡没有显著的影响，而焓变对互变异构产生了主要的影响。

The content s of 13α,14α isomers in the pairly distributed tricyclic terpanes decrea sed sharply with the increase of depth. So the tricyclic terpane maturity parame ters can well reflect t...

据此提出可以三环二萜烷热演化参数TCT，即αα构型向βα构型转化率来表征未成熟和低成熟生油岩中有机质的热演化程度。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。