醚

Chondrus ocellatus was extracted by methanol, ethanol, ethyl ether, ethyl acetate, petroleum ether and acetone, respectively.

采用甲醇、乙醇、乙醚、乙酸乙酯、石油醚、丙酮6种溶剂分别对角叉菜进行冷浸提取。

The anti-microbial activity of active materials against valsa mail,fusarium oxysporum,coniothyrium diplodieua and aspergillus nidulans were measured in vitro.the results showed that active materials extracted using acetone,aether and petroleum ether presented fungistasis to different extent on the four pathogenic fungi and had the best effect to coniothyrium diplodieua.active material extracted using ethanol presented certain anti-microbial effect to fusarium oxysporum.the results also showed there were anti-microbial active material in the leaves of cichorium intybus and founded a base on the research and application.

然后以提取液为供试药剂，对苹果腐烂病菌、棉花枯萎病菌、葡萄白腐病菌、构巢曲霉病菌4种植物病原真菌进行离体活性测定。结果表明：丙酮、乙醚、石油醚的提取液对4种病菌均有不同程度的抑制作用，其中对葡萄白腐病菌抑制效果最好；乙醇的提取液对枯萎病菌具有一定的抑制作用。表明菊苣叶中存在抑菌活性成分，补充了菊苣抑菌活性的研究内容，为该种植物抑菌活性成分的研究和应用奠定基础。

A fast colorimetric method of determining fatty alcohol polyoxyethylene ether in compact laundry powder with cobaltic thiocyanate was discussed.

介绍了用硫氰酸钴盐比色法对浓缩粉中脂肪醇聚氧乙烯醚(AEO9)含量进行快速测定的方法，该法准确、方便，相对标准偏差小于 1%，浓缩粉中其他组分对测定结果无干

In this paper we reported a new route, which has solved the known problems of other routes commendably. This route mainly consist five parts.

本文采用了一种新的合成路线来合成七氟醚，很好的解决了以往合成路线存在的一系列问题。

Methods Two sesquiterpenoids were isolated from the resinous exudates of Commiphora opobalsamum.

方法没药石油醚提取部分经硅胶柱层析分离得到二十多个倍半萜类化合物。

No fluorescence of 2b hasbeen detected. Probably the planar conjugative effect is destroyed by the sterichindrance of methoxy group.

而蒽冠醚2b则几乎没有荧光，这可能是由于甲氧基的引入导致体系的空间位阻增大，从而破坏了蒽环的平面共轭效应所致。

Water, sodium myreth sulfate, cocamidopropyl betaine, decyl glucoside, sodium chloride, citrus sinensis oil, sodium hydroxymethylglycinate, elettaria cardamonum oil, citric acid, citrus x paradisi oil, panthenol, coriandrum sativum seed oil, vanilla planifolia co2 extract

纯净水，椰油甜菜碱，肉豆蔻醇聚醚硫酸钠，氯化钠，癸基葡萄糖苷，柑橘油，羟甲基甘氨酸钠，豆蔻油，柠檬酸，柚子油，泛醇，胡荽种子油，香草提取物

The linear relationship between creaturely activity for alcohol, aether, ketone and ester and the molecular topological index is obtained.

研究了醇、醚、酮和酯对水生生物毒性、蝌蚪麻醉活性、沙镯幼虫麻醉活性、番茄植物毒性、红蜘蛛毒性、藤壶幼虫麻醉活性、局部麻醉剂活性和小鼠毒性等八种生物活性分别同其分子连接性指数的相关性。

The main compnents were cuminal and safranal (accounting for 32.26% and 24.46% respectively inthe components identified).

另有9种含量在1%以上的物质，主要是萜类中的单萜、倍半萜和芳香族醛、酮醚类物质。

Starting with two reactive methylene compounds, ethyl cyanoacetate and malononitrile, two 5-amino-1H-pyrazoles were prepared through the intermediates ketene dithioacetal.

从两个活泼亚甲基化合物开始，经过乙烯酮二硫代缩醛中间体，合成了两个5-氨基-1H-吡唑，以这个两个化合物为中间体，与芳香族和脂肪族α-溴代酮反应，而后经酸催化亚胺化互变异构后得到含咪唑并[1，2-b]吡唑甲硫醚类化合物6a-6g。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。