查询词典 petroleum ether

The poison activity, stomach toxicity action and nonselective food refusal activity of extracts and fractions obtained by extracting the stem of Mirabilis jalapa L against the 4th instar larvae of Pieris rapae L, with 3 polarity solvents（petroleum ether, chloroform and ethanol）were determined by the methods of feeding, leaf-sandwich and leaf dish.

用饲喂法、叶片夹毒法、叶磲法测定了紫茉莉茎的3种极性溶剂提取物及萃取物对菜粉蝶幼虫的毒杀活性、胃毒作用、非选择性拒食活性。

The effects of circumfluence temperature were also studied. The result showed that it was optimal to extract motionlessly 60-mesh-sieved rubber seed for 1h using petroleum ether. The yield of solvent extraction was 10% higher than that of three or four times machine-squeezed oil.

结果表明：橡胶籽仁含油率为46.72%；从橡胶籽油的成本、操作安全和劳动生产效益考虑，在橡胶籽仁粉能过60目筛、橡胶籽仁粉与溶剂为10：75、常温常压下，以石油醚为提取溶剂、静置提取方式、提取时间1h最佳，溶剂提取橡胶籽油达35.18%，比经3～4次机械压榨提取橡胶籽油高10%左右。

It was found that both n-hexane and petroleum ether were good solvent for ultrasonic-assisted process.

结果表明，正己烷和石油醚作提取溶剂效果较好。

It indicated that the allelopathic substances were mainly in the petroleum ether fraction.

结果表明，克生活性物质主要集中在石油醚相中。

After further training solution to the petroleum ether extraction of oil residue collection, and Determination of the degradation rate.

再将培养后的溶液以石油醚萃取法收集残留的石油，用紫外分光光度法测定其降解率。

Furthermore,inhibition effect of petroleum ether phase was stronger than the other different extract component from ethanol extracts.

在乙醇提取物不同的萃取组分中，石油醚部分的抑菌活性最强。

Being treated with alcohol and petroleum ether, tannin purity of the extract increased by 10% and the extraction ratio reached 95%.

采用乙醇和石油醚对其进行纯化处理，可使单宁纯度提高10％，单宁提取率达到95％。

Chen et C.Ling,20 times amount of petroleum ether,refluring for 2 h,and extracting 3 times.

结论该法的最佳工艺为：过325目筛温莪术微纳米粉体，加20倍质量倍数的石油醚，回流2 h，提取3次。

In study, we used petroleum ether as the solvent instead of aether during oximation process, which increased the yield above 85% dramatically.

对该路线进行了较多的实验工作，对各步反应的诸多影响因素进行了研究，确定了合理的工艺条件。

Its main insecticidal active components were weak polar matter and mainly distributed in the polarity range of petroleum ether.

不同极性萃取物的活性比较得知，杀虫活性成分主要是酯溶性的弱极性物质，分布在石油醚所在极性范围内。

He and Nina moved to California and lived at 2005 Ivar Street, Apt.

他和Nina搬到加州，并在2005年伊瓦尔街，公寓生活。

Droperidol （ potently inhibits transfected HERGchannels and this is the probable mechanism for QT prolongation.

氟哌利多有效地抑制了转染的 HERG 钾通道，可能是 QT 间期延长的机制。