查询词典 ethyl acetate

The exact of petroleum ether was the acaricidal active site of Eungenia caryophyllata. 3.Isolation, purification and identification of compounds with acaricidal activity in Eugenia Caryphyllata: The exact of petroleum ether was separated into 6 parts by silica gel column chromatography with gradually increasing polarity of petroleum ether: ethyl acetate. The part C was demonstrated to be the most effective part by acaricidal activity test in vitro,and the time for it to kill all experimental mites was about 20 min.

丁香杀螨活性成分的追踪分离、纯化与结构鉴定：采用硅胶柱层析法，以石油醚：乙酸乙酯溶剂系统梯度洗脱，对丁香石油醚提取物进行分离，得到A~F 等6 段混合物，离体杀螨试验发现，C 段混合物具有突出的杀螨活性，50%浓度平均15min可杀死全部供试螨虫。

The results also indicated a low production of acetic acid, acetoin and ethyl acetate, and high amounts of amyl alcohols in all of the ciders.

结果在全部萍果汁也表明了乙酸、乙醛和乙酸乙酯旳低产量和大量产生旳戊基乙醇。

The higher concentration of ethyl acetate (50 mg/l) observed in the cider made by the traditional system in 2001 could be explained by the dominance of aciculate yeast in the course of the fermentation.

在2001用传统作业方法生产萍果汁中观察到旳更高浓度旳乙酸乙酯(50 mg/l)现象，能用发酵其间针状旳酵母旳优势来解释。

Acetic acid and Ethyl acetate are produced by Yangtze River Acetyl Cooperation Limited,ajoint venture of BPand Sinopec.Their production volume,Quality and technology are in first class in China and keep equal position in the world.

公司代理的醋酸和醋酸乙酯产品，是由中国石化和英国BP公司在重庆的合资企业-扬子江乙酰化工有限公司生产，其产量，质量和技术水平均居国内领先，与国际先进水平同步；公司双氧水的供应商是法国ATOFINA在上海的合资厂和中成化工，他们是中国目前最大和最好双氧水生产基地。

METHODS:Ferulic acid in Naofuqing capsule was extracted with ethyl acetate by alkalization and acidification,and determined by TLC scanning method.

采用碱水提取，酸化后以醋酸乙酯萃取脑复清胶囊中阿魏酸，薄层扫描法测定含量。

The results show that the ethyl acetate extract of Alpinia oxyphylla Miquel possesses strongest DPPH radical scavenging activity and reducing power in a concentration-dependent manner.

在还原能力、清除DPPH自由基和羟自由基方面，乙酸乙酯提取物表现出了很强的抗氧化能力，呈现剂量依赖关系。

The petroleum ether extacts,ethyl acetate extracts and methanol extracts from roots of Aristolochia debillis Sieb.et Zucc.

通过琼脂平板扩散试验和双倍稀释试验，对青木香Aristolochia debillis Sieb.et Zucc。

Azelaic acid showed a higher relative antifeeding rate or a promotion effect on eating, and the absolute antifeeding rate of its ethyl acetate solution could reach 100 percent.

壬二酸的相对拒食率有的较高，有的表现为促进取食的作用，其乙酸乙酯溶液的完全拒食虫率高达100%。

Methods TGGP was purified from Balanophora japonica Makino by n-hexane and ethyl acetate extraction and column chromatography.

用萃取和柱层析方法分离提纯TGGP，用酶联免疫测定法、天然聚丙烯酰胺凝胶电泳、分子排阻高效液相色谱法检测其抑制HIV gp41六螺旋束结构形成的作用，用细胞－细胞融合方法检测TGGP抑制HIV进入靶细胞的活性。

The major results obtained are: PCR-RFLP method is suitable for molecular identification of Shihu; 205 compounds were isolated from 10 species of Dendrobium, including 21 new compounds, and 28 compounds isolated from genus Dendrobium for the first time. Each of the extracts and compounds were screened for anticoagulant and antitumour activities separately. The results indicated that the ethyl acetate extract from Dendrobium chrysanthun has significant anticoagulant function; the antitumour function of the 4 bibenzyl components from Dendrobium chrysotoxum is stronger than that of phenanthrene, of which the erianin has significant anti-angiogenic effect both in vivo and in vitro; components with moderate or stronger antitumour activities were found in the extracts of D. thyrsiflorum, D. chrysanthun and D. trigonopus; quality standard for 5 species of Dendrobium was drawn up use active or indicative components as control.

重要研究结果有：经方法学研究，认为PCR-RFLP法适于作为石斛属药材分子标记鉴定方法；对10种石斛进行化学成分分离鉴定，共分得205个化合物，其中新化合物21个，首次从石斛属分得的28个；对提取物和各单体化合物分别作抗凝血、抗肿瘤等活性筛选，结果说明束花石斛乙酸乙酯部位有显著的抗凝血作用，鼓槌石斛的4个联苄类成分抗肿瘤作用强于菲类，联苄类毛兰素在体内外有显著抗血管生成活性，球花石斛、束花石斛及翅梗石斛均筛到中等或较强抗癌活性的成分；选择有活性或指标性成分作对照品，对5种石斛草拟了质量标准。

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。