水化合物

The catalysts were made up of a kind of tertiary amine and a small amount of barium hydroxide.

通过理论分析和实验总结，研究了不同种类的碱性催化剂对酚醛树脂水溶性的影响，最后确定同时使用某种叔胺类化合物和少量氢氧化钡作为合成水溶性酚醛树脂的催化剂。

A solid compound containing water molecules combined in a definite ratio as an integral part of the crystal.

水合物结晶中有一定比例水分子成分的固体化合物，其中水分子与晶体的含量为一固定比例

A solid compound containing water molecules combined in a definite ratio as an integral part of the crystal .

水合物结晶中有一定比例水分子成分的固体化合物，其中水分子与晶体的含量为一固定？

The synthesis methods of nipagin esters catalyzed by sulfuric acid , p- toluene sulfonic acid , ferric sul-fate hydrate, ferric chloride hexahydrate, aluminium chloride hexahydrate, rare earth compound, solid super acid and heteropoly acid were reviewed.

评述了采用硫酸、甲苯磺酸、合硫酸铁、水合三氯化铁、水合三氯化铝、土化合物、体超强酸和杂多酸等催化剂催化合成对羟基苯甲酸酯的方法。

It provides a route tothe compounds which contains three functional groups, two carbon-nitrogentriple bonds and one carbon-carbon double bond. In water, metallic indiumpromotes carbon-sulfur bond coupling reaction of aromatic sulfonyl chloride withsuitable organic halides to afford sulfones. In the last chapter, metallic tin mediated allylation of aldimines with allylbromide was revealed.

第三章，我们研究了在水相介质中金属铟促进的烯丙基溴对1，1-二氰基-2-芳基乙烯的Michael加成反应，生成一个含碳碳双键和二个碳氮叁键的三官能团化合物，另外，金属铟在水介质中还可以促进芳基磺酰氯与卤代烃发生碳硫键的偶联，生成砜。

Silymarin is a kind of favonolignan compound, extracted from the seed capsule of plant Silybum marianum,It is yellow powder with a bitter taste.

简 介：水飞蓟素是黄酮木脂素类化合物，是从菊科药用植物水飞蓟种子的种皮中提取出来的，呈黄色粉末，味苦。

Meanwhile, several physicochemical descriptors of xanthone molecules were calculated by using quantum chemistry method.

同时，运用量子化学计算了山酮分子的物化参数，并选择相互作用能、疏水常数(log P；其中P为正辛醇-水分配系数)和山酮分子总能量作为分析结构-电泳迁移定量关系的物化参数，用以研究分离机制及在毛细管区带电泳分离中山酮类化合物与β-CD 和磺酸化β-CD间的分子识别过程。

Meanwhile, several physicochemical descriptors of xanthone molecules were calculated by using quantum chemistry method. Among the physicochemical parameters, interaction energy, the logarithms of octanol-water partition coefficient and total energy of xanthone molecules were selected to investigate the separation mechanism and describe molecular recognition process between the xanthones and the CDs in CZE by means of quantitative structure-electromigration relationships.

同时，运用量子化学计算了山酮分子的物化参数，并选择相互作用能、疏水常数(log P；其中P为正辛醇-水分配系数)和山酮分子总能量作为分析结构-电泳迁移定量关系的物化参数，用以研究分离机制及在毛细管区带电泳分离中山酮类化合物与β-CD 和磺酸化β-CD间的分子识别过程。

After centrifugation, the extracts were separated on HILIC column by using acetonitrile-water as mobile phase. The analytes were identified and quantitated by LC-tandem MS under the positive/negative electrospray ionization and multiple reaction monitormode. The calibration curves showed good linearity in the range of 25-5000 μg/kg for melamine and cyanuric acid, and 50-10000 μg/kg for ammeline and ammelide. The limits of detection and limits of quantification were in the range of 5-20 μg/kg and 50-100 μg/kg, respectively.

牛奶样品直接用乙腈超声波提取；奶粉样品先用水溶解后再加乙腈超声波提取，高速离心后以乙腈－水为流动相，采用亲水作用色谱柱分离这4种化合物，在电喷雾正、负电离切换多反应监测模式下进行定性与定量分析，三聚氰酸一酰胺与三聚氰酸二酰胺含量在50~10000μg/kg之间、三聚氰胺与三聚氰酸在25~5000μg/kg之间，均获得良好的线性。

This research utilized the method of organic synthesis, researching different amounts and positions of hydroxy-substituted benzoic acid and serotonin into amide reaction, so as to produce a series of polyhydroxy substituted N-benzoylserotonin derivatives (compound 1-10). Accordingly, this study conducts the following four tests. I. The activity of antioxidant and the experiment of ability to scavenge DPPH free radical, II. The ability of overall antioxidant—the activity of TEAC, III. The activity test of inhibit Tyrosinase, and IV. The study of absorbing UV / VIS Spectrophotometers. This study use trolox, arbutin, and octyl salicylate as the control groups, and to test the ability of anti-oxidation, the activity of inhibit Tyrosinase, and the ability of absorbing UV. This research ultimately intends to investigate the applied value of those compounds into cosmetics.

本研究主要利用有机合成的方法，将不同数量及不同位置的羟基取代苯甲酸化合物与色洛冬宁进行醯胺化反应后，得到一系列的多羟基取代之N-色洛冬宁苯甲醯胺衍生物（化合物1 ~ 10），进行四种不同活性测试方法：一、清除DPPH自由基能力抗氧化活性测试；二、总抗氧化能力活性测试；三、抑制酪胺酸酶活性美白测试；四、紫外线／可见光光谱仪吸收测试，并以水溶性维生素E、熊果素、水杨酸辛酯当作对照组，探讨其抗氧化能力、抑制酪胺酸酶的活性能力与吸收紫外线能力，再进一步探讨其应用於化妆品上的价值。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐