查询词典 diacetate

The wholly aromatic four-component copolyesters were prepared from p-acetoxy-benzoic acid, hydroquinone diacetate, 2,6-naphthalene dicarboxylic acid and isophthalic acid by melting polycondensation.

由对乙酰氧基苯甲酸、对苯二酚二乙酯、2，6-萘二甲酸及间苯二甲酸四种单体通过熔融缩聚反应，合成了全芳香族四组分共聚酯。

Instead of environmentally toxic chromium oxidant, singlet oxygen generated photochemically was used as environmentally friendly and benign oxidizing agent to accomplish the transformation of pseudodiosgenin diacetate to diosone efficiently in a low toxic and less expensive solvent acetone.

裂解薯蓣皂甙元所得的假薯蓣皂甙元，在低毒且廉价的丙酮溶剂中，在光敏剂和光的存在下，与氧气反应，得到的产物再经酸解消除反应得到合成其它多种甾族药物的重要前体16-脱氢孕烯醇酮醋酸酯。

The results show that the variation of diameter of ATF yarn increases with increasing the over feed of peel filament, but the variation of average diameter decreases. When the polyester FDY is used as core filament, the structure of diacetate composite ATF is looser than the ATF with capron as core filament, and the unevenness of yarn core and outside are also greater. The ATF loops or hairiness mainly centre at the height 0.5 and 1.0 mm, the amount decreasing with the height increasing, with exponential distribution. When the over feed of peel filament enhances, the number of loops or hairiness decreases at the height of 0.5 mm, while other height of loops or hairiness increases.

结果显示：空变丝纱芯直径的变异随皮丝超喂提高而增加，但平均直径的变异却呈下降趋势；以涤纶FDY做芯丝时，二醋酯长丝复合空变丝的结构较芯丝为锦纶的空变丝松散，纱芯和外围不匀程度也相对较大；空变丝丝圈丝弧或毛羽主要集中在高度为0.5mm和1.0mm的位置，其个数随高度的增加而不断减少，基本呈指数分布；皮丝超喂提高时，0.5mm高度的丝圈丝弧或毛羽个数减少，其他高度的丝圈丝弧或毛羽个数则增加。

Yunnanensis. The pollens of dehisced anthors of flowering P. polyphylla plants was slightly painted on the slide glass, the activities of P. polyphylla pollens were determined resp. by iodine-potassium iodide dyeing method (I2-KI), triphenyl tetrazolium chloride staining method, aceto carmine dyeing method and fluorescein diacetate method with a little improvement.

方法］将滇重楼开花植株裂开花药的花粉轻轻涂抹载玻片上，分别用碘－碘化钾(I2-KI)染色法、氯化三苯四氮唑染色法、醋酸洋红染色法和略有改动的荧光素二醋酸酯法对滇重楼花粉活力进行侧定。

Sodium diacetate has the role in preventing the increasing of MDA and the decreasing of pectin in asparagus. All of the four preservatives cannot prevent the increasing of coarse fibre. The super absorbent polymer can effectively delay dewing in the package bags in a given time, but the available dosage and package material should be studied thoroughly.

双乙酸钠处理还可以较好地抑制MDA含量的增加并有延缓果胶分解的效果。4种防腐保鲜液处理均不能抑制芦笋纤维素含量的增加高吸水性树脂在一定时间内具有理想的防结露效果，但适宜使用剂量和包装方式尚需进一步研究。

Pregnana-3, 16, 20-triol was efficiently transformed into pregn-16-ene-3S, 20S-diol diacetate. And then the Pd-catalyzed reaction was reinvestigated.

提供了一种将剑麻皂甙元降解产物孕甾三醇转化为孕甾－16-烯－3S，20S-二醇二乙酸酯的高效合成方法，并重新考察了其钯催化反应。

Objective:A GF-AAS method was established for the determination of lead in tipping paper,filter plug wrapping paper,diacetate cellulose tow,polypropylene fiber tow,glycerol triacetate for cigarette,polypropylene fiber tow filter rod adhesive,polyvinyl acetate emulsion adhesive,hot melt adhesive.

目的：建立了接装纸、成形纸、醋纤丝束、聚丙烯丝束、三醋酸甘油酯、聚丙烯丝束胶粘剂、白乳胶、热熔胶等8种滤嘴用卷烟材料中铅的测定方法—石墨炉原子吸收光谱法。

Heating, ethanol precipitation, and ion-exchange chromatographies had been carried out to isolate the protein with specific stimulating activity from newborn calf liver, and [(3)H]thymidine deoxyribose/bromodeoxyuridine incorporation and carboxyfluorescein diacetate succinimidyl ester-based proliferation assay to determine the bioactivity in vitro and in vivo.

通过用加热、乙醇沉淀、离子交换层析等方法来分离新生小牛肝脏中含有特殊刺激活性的蛋白和用胸嘧啶脱氧核糖/溴脱氧尿苷联合羧基荧光素双乙酸钠琥珀酸酯为基础的扩增分析其体内和体外的生物活性。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。