醚的

It was found that the catalytic activities of HZSM-5 sample (ZS540.2) steaming at 540℃ latm for 2hr to condensation reaction and etherization of propylene oxide were enhanced.

发现了适度水热处理HZSM-5应用于缩醛和环氧丙烷醚化等-系列反应后得到的催化活性增强现象。

In the work, three P-Mo-V heteropoly acids with different Vanadium number have been synthesized by acidification- etherization. Their component and structure have been confirmed by ICP-AES and TGA. They have been characterized by FT IR, XRD and UV. FT IR demonstrates their Keggin structure.

本文采用酸化—醚化法合成了三种不同钒原子数的P-Mo-V三元杂多酸，并用ICP-AES和TGA确定其化学组成和结构，用FT IR、XRD和UV等手段对其结构和性质进行了表征。

Amphoteric tapioca starch with carboxyl groups was produced via crosslinking, oxidation and etherization reactions. The product was then characterized by means of SEM, XRD and colloid titration, with the preparation mechanism being also investigated.

采用交联、氧化和醚化反应制备羧酸型两性淀粉，通过扫描电子显微镜、X射线衍射、胶体滴定等方法对该淀粉进行表征，并研究了该两性淀粉的合成机理。

Results The optimum combination was 10μmol/L β-asarone +3μmol/L eugenol, which can decrease the concentration of intracellular Ca(superscript 2+), inhibit the production of NO and increase the survival rate of PC12 cells.

结果β-细辛醚10μmol/L+丁香酚3μmol/L组合能有效减少细胞内Ca(上标 2+)浓度，抑制NO的产生，提高细胞存活率。

Three kinds of characterizations confirmed the existence of lyso-PAF in the exudate.

这些研究第一次将具有醚脂结构的物质与生物学活性联系了起来。

It showed that main constituents are linalool, geraniol, farnesol , safrole, citral, t-anethole , decanal and lauric aldehyde respectively and with high cont.

从它们的利用部位花、果、叶和根中，可提取芳香油，主要成分分别为芳樟醇、香叶醇、金合欢醇、黄樟素、柠檬醛、茴香醚及癸醛、十二碳醛等，含量相当高，为重要调香原料，有的作药用，颇具发展种植和开发利用价值。

In this thesis we carried on the preliminary study to the extraction process of plant essential oil, and measured the biological activity of plant essential oil on red flour beetle, Tribolium castaneum and the housefly, Musca domestica vicina.

采用三因素四水平正交试验设计对植物精油进行提取工艺研究，最佳提取工艺条件是A_2B_3C_3，即50g供试植物加入1000ml水，水蒸气蒸馏120min后，用石油醚萃取，萃取液浓缩以后得到的精油可获最大收益。

Proceeding from the considerations of environmental protection,we choose petroleum ether other than Freon.

从保护环境的角度出发，应放弃氟利昂，选择石油醚。

The best yields are obtained if the ether solvent is distilled from the Grignard under vacuum and replaced with hydrocarbon solvent, such as benzene.

最好的产量得到醚溶剂，如果是从格氏蒸馏真空和烃类溶剂，如苯，取代。

Method IV is an effective process to purify the ethanol-extracts of gromwell in scale.

含水乙醇-石油醚萃取法较适于工厂生产中紫草乙醇浸膏的精制。

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。