提纯

N,N-dimethyl-N'-(2-trifluorometyl-1-pentafluoroethyl) perfluoro propenyl propane diamine and N,N-dimethyl N'-(2-trifluorometyl-1-pentafluoroethyl) perfluoro propene propane diamine were prepared by the reaction of hexafluoropropene dimer and N,N-dimethyl propanediamine in the molar ratio 1:1.0 at about 35℃for 8h, and the structures of I were identified by IR and NMR spectra.

本文以六氟丙烯二聚体和N，N-二甲基丙二胺为主要原料合成了两种含氟中间体叔胺——N，N-二甲基-N'-(2-三氟甲基-1-五氟乙基)全氟丙烯基丙二胺和N，N-二甲基-N'-(2-三氟甲基-1-五氟乙基)全氟烯丙基丙二胺，用薄层色谱和柱色谱等方法对产品进行分离提纯，并运用红外光谱和核磁共振等分析手段对其结构进行了表征。

This is one purification technique you don't want to miss!

这是一个你不会想错失的提纯技巧！

In addition, the mechanism and the typical procedures of each purification method are also discussed.

对这些提纯方法的机理也进行了讨论。

It is mainly used for material separation and purification.

它主要用于物质的分离和提纯。

In addtion, a feasible study has been done on the application of molecular distillation to purifying piperonyl butoxide ,a synergist for pyrethrin, synthesized from safrole oil.

并利用短程蒸馏技术对从由黄樟油合成的混合物中分离提纯胡椒基丁醚进行研究。

The product,after purified with xylene,met the requirement of reagent standards of pyrogallol.The content of pyrogallol was 99.0%.

产品用二甲苯提纯，其质量达到试剂标准，焦性没食子酸含量为99.0％。

With the isolated and purified PSP as test materials, the chemical model systems were used to produce and OH. resp. And the scavenging capability of PSP on free radicals, its inhibition effect on pyrogallol autoxidation and the effects of PSP on SOD activity and MDA content in tumor-bearing mice were studied.

方法］以已分离提纯的甘薯多糖为试验材料，利用分别产生氧自由基O2(上标-和羟自由基的化学模型体系，研究甘薯多糖清除舟自由基能力及其对邻苯三酚自氧化的抑制作用和甘薯多糖对荷瘤小鼠SOD活性和丙二醛含量的影响。

Was inoculated into chenopodium quinoa to reproduce in large number .Then the virus was extracted and purified for observing by electronic microscope and sequencing.

将从樱桃树上分离的得到的病毒，接种的藜科的茴菜Chenopodium quinoa上，大量繁殖，然后提纯病毒进行电镜观察和核酸序列测定。

After isolating the toxin, the researchers radioactively labeled and injected a purified form of the toxin, Tx2-6, into rats that suffered from high blood pressure and severe erectile dysfunction.

在分离这种毒液后，研究者用放射标记，将提纯的 Tx2-6毒液注射到有高血压和严重勃起功能障碍的老鼠体内。

The result showed, rarefied flavonoid from Chinese olive sure have antioxygenic activity.

结果表明，提纯的青橄榄黄酮具有一定的抗氧化活性。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。