异向的

The amidation of fatty acid with amine constructed the skeleton of malyngamide M,and then transformation of Z-olefin to E-olefin completed the synthesis of target molecule.

第4章详细阐述了使用高度会聚通用的路线完成含有末端烯氯结构的malyngamides O，P，Q，和R，以及Q和R的C-5差向异构体的全合成。

High performance liquid chromatography, carbon-13 nuclea magnetic resonance, chemical ionization mass spectrometry and gas chromatography with flame ionization detection have been employed for the identification and quantitative deter mlnation of the epimers of amygdalin.

高效液相色谱法、carbon-13 nuclea 磁场共振电离质谱、化学品与气相层析法，以氢火焰离子化检测被用来识别和定量的威慑 mlnation差向异构体的苦的。

The former was monophyletic while the phylogenetic status of Pteriomorphia was ambiguous owning to the controversial position of Ostreidae.

与其他分子研究的结论不同，本研究分析结果支持现有的分类系统，即异齿亚纲可以向下划分为两个目：帘蛤目和海螂目。

Before the rancor could make its way to Wam, the Skrilling Pote Snitkin made his way into the pen and seized the scrawny alien in his powerful hands.

趁兰克尚未扑向万，斯克里尔林人波特·斯尼特金跑入兰克圈，用一双有力的大手抓走了这个骨瘦如柴的异族人。

To explain relationship between the effect of CLD on senile Demention and neuron in hippocampal area. The change of natural aging mice's neuron in hippocampal area were studied by applying microscope and transilluminating electric microscope. Results: Comparing with the young control, the old control mice's hippocampus had less small pyramid cells, the nerve cells denaturalizing and their branches reducing in the microscope. Hippocampal nerve cells were degenemiceing, with nucleus membrance crinkling like wave shape were not clear, and chromatin condensing with high electron density, heterochromatin accruing, part cell organs inclosing nucleus, nucleus condensing in the EM.

为了阐明菖龙丹抗老年性痴呆作用与海马区神经元结构的关系，运用光镜和透射电镜观察了菖龙丹对自然衰老小鼠海马区形态的影响，结果显示老年对照组小鼠光镜下海马锥体细胞较青年对照组数量减少，细胞体积变小，神经元变性，分枝减少；电镜下海马神经细胞发生退化改变，核膜皱缩，呈波浪状，膜结构不清晰，核染色质浓缩，电子密度高，异染色质较多，部分胞浆细胞器向细胞核聚集，有的可见细胞核固缩。

At the same time, the weakness of GIS spatial analysis cumbers the extent and profundity development of geographical information system.

但由于地理信息数据模型与数据结构、数据库管理的多样性与异构性，增加了地理信息共享困难以及地理信息系统空间分析功能的薄弱性，影响了地理信息系统向广度和深度发展。

These include catechin and gallocatechin (hydroxyls at positions 5' as well as at 3' and 4' as in catechin), their esters with gallic acid, catechin gallate, and gallocatechin gallate, and their epimers.

它们有几茶素和儿茶素(在5'位上以及如同儿茶素中一样在3'和4'位上羟基化)，它们与酸生成的酯，即儿茶素酸酯和儿茶素酸酯，以及它们的差向异构体。

Two approaches for the asymmetric syntheses of naturally occuring eudesmane-type triol kudtriol and 5-epi-kudtriol as well as their C-11 epimers were achieved starting from-dihydrocarvone through six and seven steps, respectively.

以-二氢香芹酮为原料，用两条合成路线分别经六、七步反应完成了三羟基桉烷类天然产物Kudtriol、5-epi-Kudtriol及它们的C-11位差向异构体的不对称全合成。

The automatic nail making machine is a special purpose machine which is designed for processing various size of nails.

全自动制钉机是专为制造各种规格的圆钉而精心设计的，我厂生产型号齐全，可以生产各种圆钉及异形钉，用途广泛，操作简便，使用安全，运行可靠，随时向您提供各种配件。

Finally, we demonstrate the transformation of β-hydroxy nitriles to a variety of diastereomerically pure and highly functionalized acyclic and heterocyclic γ-amino alcohol derivatives.

最后， 本文介绍了由β-羟基腈向各种纯非对映异构体，多功能性的开环和杂环γ-氨基醇衍生物的转化反应。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。