醚的

The crude PPG was purified with neutralization-absorption process and the experimental conditions of crystallization, decolor , dehydration and removement of metal irons were investigated respectively.

应用中和-吸附的工艺方法对聚醚进行精制，并且分别考察了结晶、脱色、脱水、脱金属离子等重要实验条件，讨论了使用不同的吸附剂，对聚醚精制效果产生的影响。

METHODS: We measured levels of blood hydroperoxides as an indexof oxidative injury of cellular components, as well as plasmaferric-reducing ability as an index of total antioxidant potential,during sigmoidectomy under four conditions: open sigmoidectomywith sevoflurane anesthesia, laparoscopic sigmoidectomy withsevoflurane anesthesia, open sigmoidectomy with propofol anesthesia,and laparoscopic sigmoidectomy with propofol anesthesia.

在四种不同麻醉方法下乙状结肠切除术中，测定血液中的过氧化氢水平作为细胞氧化损伤的指标，以及血浆铁还原能力作为总抗氧化潜力的指标：七氟醚麻醉开腹乙状结肠切除术，七氟醚麻醉腹腔镜下乙状结肠切除术，异丙酚麻醉开腹乙状结肠切除术，异丙酚麻醉腹腔镜下乙状结肠切除术。

The polyurethane hot-melt adhesive film was prepared by casting process and the effects of polyether diol trpe,chain exlender amount andpolyol molecular weight on tensile strength,tensibility and hardness were studied.

采用流延法制备聚氨酯热熔胶膜，对影响聚氨酯热熔胶膜的拉伸强度、断裂伸长率、硬度的几个因素：聚醚多元醇类型、扩链剂用量和聚醚多元醇的分子质量等进行了研究。

In order to investigate the relation between the ligands and rare earth ions, in this dissertation, two new polyaza cryptands, two new tripyrazolone ligands, a macrobicyclic rare earth cryptates, a tripyrazolone and a tripodal ligands rare earth complexes have been synthesized.

为了进一步研究和探讨穴醚、吡唑啉酮、三脚架化合物配体对稀土元素的配位作用，论文首次报道了两个新氮杂穴醚配体、两个新三脚架吡唑啉酮结构配体、一个系列大二环新型的稀土配合物、一个系列三脚架吡唑啉酮结构配合物、一个系列三脚架结构三酸配合物的合成。

Flame retardant properties and mechanical properties of ABS which was incorporated into different molecular weight bromated epoxy resins flame retardant agent were evaluated.

与十溴二苯醚对比试验研究表明，添加高分子量溴化环氧树脂阻燃剂的ABS材料溴含量为7.9%时与添加十溴二苯醚阻燃剂的ABS材料溴含量为10.1%的阻燃性能相当。

Therefore, much attention has been focused on the preparation of soluble aromatic polyether, and fluorinated polys is a very important field in these research work.

所以，制备可溶性的聚芳醚一直是人们研究的重点，而含氟聚芳醚是其中一个非常重要的研究方向。

Polyether modified polysiloxane is a new multi-functional fine chemical product. And it is made from inarching polyether segment on the branched chain or terminal chain of active polysiloxane.

聚醚改性聚硅氧烷是一类新型的多功能的精细化工产品，它通过活性聚硅氧烷的支链或链端上接聚醚链段而得到。

Dissolve 50.0g of polyethylene glycol in 75ml of diphenyl ether, previously warmed, if necessary, just to melt the crystals, in a 250ml distilling flask.

你的理解好像是必要时加入聚乙二醇和二苯醚后一起加热，而我的理解是必要时加入聚乙醇后用预先加热的二苯醚溶解。

Once the prodrug is in the blood supply, esterases hydrolyse the ester to unmask the carboxylate group and the drug can interact with its target.

药物的醚作为前体药物，口服作用时，由于醚把羰基官能团的极性遮掩了，前体药可以穿越肠内壁的细胞膜，一旦前体物进入血液循环，就会发生水解暴露出羰基使药物与目标相互作用。

In this dissertation, preparation of polysubstituted ethene and heterocyclic compounds based on 2-hydroxyalkyl phenyl selenides andα-phenylselenopropionic acid reagents were further investigated as follow: Firstly, O-ethyl-O-vinyl phosphonates were prepared in a one-pot, two-step transformation by Mitsunobu reaction of 2-hydroxyalkyl phenyl selenides with monoethyl esters of phosphonic acid in the presence of diethyl azodicarboxylate and triphenyl phosphine (PPh3) followed by oxidation-eliminatio...

中文摘要：本文主要进一步探索了2-羟基烷基苯基硒醚、α-苯硒基丙酸试剂在制备多取代乙烯和杂环化合物反应中的应用，具体研究内容和结果如下：一、在偶氮二羧酸乙酯和三苯膦(PPh3)存在下，苯基-2-羟基烷基硒醚和O-乙基膦酸单酯发生Mitsunobu反应，无需分离和纯化反应中间体，直接使用30 %的双氧水进行氧化-消除反应，提供了&两步、一锅&合成O-乙基-O-乙烯基膦酸酯的新方法，该方法反应条件温和，操作简便，产物收率良好(76-82 %)。

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。