查询词典 ether

The research aimed to study the chemical constituents from Swertia chirata extracted with petrolelum ether.

［目的］研究印度獐牙菜石油醚部位化学成分。

S. chirata ethanol-extracts was extracted with petrolelum ether, ethyl acetate and butanol, respectively.

方法］分别用石油醚、乙酸乙酯和正丁醇萃取印度獐芽菜乙醇浸膏，所得产物用硅胶柱、Sephadex LH-20柱洗脱后进行结构鉴定。

Chirata, and they were identified as β-sitosterol and swerchirin by spectral method. These two compounds were got firstly from the petrolelum ether fraction of S. chirata.

结论］2种化合物β-谷甾醇与1，8-二羟基-3，5二甲氧基山酮均为首次从印度獐芽菜乙醇提取物的石油醚部位分离得到。

A tiny medicine-chest was open upon the dressing-table, and little stoppered bottles of red lavender, sal-volatile, chloroform, chlorodyne, and ether were scattered about.

梳妆台上，一只小药箱打开着，小小的一瓶瓶塞好了塞子的红色薰衣草水、挥发盐、氯仿、哥罗颠、二乙醇等，散乱地放在台上。

Practically insoluble in water; soluble 1 in 50 in alcohol, 1 in 50 in chloroform; slightly soluble in ether.

几乎不能溶解在水中；可溶物1 在50 在酒精里， 1 在50 在三氯甲烷里；轻微地可溶解在以乙醚里。

The low molacular hydrogenated bisphenol A epoxy resin was prepared by the ring-closing reaction of the chlorohydrin ether and alkali and high molecular hydrogenated bisphenol A epoxy resin was synthesis by the addition polymeration of the low one and hygenated bisphenol A.

氢化双酚A和环氧氯丙烷在催化剂作用下开环反应生成了氯醇醚，而后加碱进行闭环反应，制备了低分子质量氢化双酚A型环氧树脂，再将其进一步与氢化双酚A等进行加聚反应，得到高分子质量环氧树脂。

Chloropicrin in vegetables and fruits was determined by gas chromatography with ECD after extracted with petroleum ether under ultrasonic.

采用石油醚对蔬菜、水果样品进行超声波提取，以气相色谱电子捕获检测器测定氯化苦残留。

It was also found that the decrease of immersion resistance and impedance of the commercial anti-corrosion of poly (vinyl chloride co-isobutyl vinyl ether) coating with increase of directly adding of nano-TiO2, which was elucidated with the theory of critical pigment volume concentration. At last, the optimal coating prescription was gotten as follows: 0.5-1.0g nano-TiO2 B, 25.6g resin, 33.4g xylene, 1.4g chlorinated paraffin, 1.5g 15% slurry of organic bentonite, 0.8g green chrome, 7.7g grey mica ferric oxide and 0.6g non-float aluminum.

直接添加纳米二氧化钛的商品化防腐涂层耐浸泡性能和交流阻抗值随添加量增加而降低，利用临界体积浓度理论等解释了该现象；通过实验获得了如下最佳涂料配方为：0.5-1.0g纳米TiO2，25.6g氯醚树脂，33.4g二甲苯，1.4g氯化石蜡52＃，1.5g 15%有机膨润土浆，0.8g氧化铬绿，7.7g云母氧化铁灰，0.6g非浮型铝粉。

Also the molecular structure and functional effects of this active component were studied in detail. 1 Extraction, separation, purification and structural identification of the functional component in Chufa After initial handling of waste slurry to solid powder, ethanol was used to lixiviate it followed by the extraction with petroleum ether,ethyl acetate,n-butyl alcohol one by one, the polarity of three organic reagents being changed from low to high.

荸荠功能因子的提取、分离、纯化及结构鉴定以马蹄粉厂产粉废浆为原料，经过实验室初处理成固态原料粉后，用乙醇浸提，再将浸提物以水悬浮，依次通过极性从小到大的石油醚、乙酸乙酯、正丁醇三种有机溶剂两相萃取分部，并以金黄葡萄球菌、枯草芽孢杆菌和致病大肠杆菌为指示菌，检测上述各部分提取物的功能效果。

High performance liquid chromatography was used to establish the fingerprint of ether extract of claret to distinguish claret quality stability.

采用高效毛细管电泳建立了干红葡萄酒的乙醚提取物的指纹图谱，并进行指纹图谱分析。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。