查询词典 solubility

To improve water solubility of betulin, two acyl groups were introduced at C-3 and C-28 hydroxy groups of betulin. 3, 28-di-O-glutaryl-betulin was synthesized with pyridine as solvent and DMAP as catalyst from betulin and glutaryl anhydride.

为了增强桦木醇的亲水性，对桦木醇的C-3位、C-28位羟基进行修饰，在吡啶作溶剂、二甲基氨基吡啶作催化剂的条件下，与戊二酸酐反应合成桦木醇戊二酸酯。

Betulin, a naturally occurring triterpene, available in abundance up to 10% dry weight of bark from white birch bark, seems to be an ideal starting material for the synthesis of betulinic acid.During a discovery effort from natural resources, in order to seek new biologically active compounds, reaearch on chemical modifications of valuable precursors have been demonstrated to be an effective path to resolve the water solubility problem and increase bioavailability.

从自然界寻找先导活性化合物，再进行结构修饰，试图提高其活性，降低其毒副作用，并提高其水溶性，是创新药物的一条重要思路，而且在新药研制中也得到了很好的应用并取得了显著的成绩。

Betulin, extraction, solubility, betulinic acid, derivative, synthesis

关键字或关键词组：白桦酯醇，提取，溶解度，白桦酯酸，衍生物，合成

Because the solubility of the complex monomers is very important for polymerization, the bidentate ancillary ligand of the bicycloiridium complexes also has an effect on the luminous properties of the chelating polymer.

实验证明了在这类电磷光聚合物中配合物单元辅助配体合理的分子设计，可以提高配合物单体的溶解度，提高聚合物的分子量和发光性能。

Afterintroduction of basic electroluminescent theory of polymers and discussion of the studysituation of electroluminescent polymers and polyphenylene vinylene particularly, therelationship among structure, solubility and electroluminescent properties was studiedIn this paper, polyether-type PPV, polythioether-type PPV, and PPV containingoxadizole, biphenylene, or saturated aliphatic unit were synthesized, the monomers andpolymers were characterized as well.

在讨论了电致发光聚合物的基本发光原理并深入地分析了国内外有机电致发光聚合物尤其是聚苯撑乙烯的研究现状与发展趋势的基础上，论文着重研究了PPV衍生物的结构与它的可溶性以及电致发光特性的关系。

The total amount of Mg and Fe ions in the equilibrium solution depends on the solubility of resulting double salts. The reaction speed is decided by the speeds of ionization of ammonia salts and brucite together.

平衡溶液中镁、铁离子的总量取决于生成复盐的溶解度，反应的速度是由铵盐电离的速度和水镁石电离的速度共同决定的。

In this paper the study on optimizing the esterification of cellulose and some character of CAB(the degree of substitution of cellulose, solubility, the thermal properties and molecular weight) was discussed. The mechanism of the esterification of cellulose in butyric acid/ acetic acid/ butyric anhydride which comprises the creation of the acetic butyric anhydride, acetyl cation and butyryl cation was investigated by the study of the effect of the content of the organic acid and anhydride on the degree of acetyl and butyryl substitution of cellulose.

最后本文根据纤维素在丁酸/乙酸/丁酸酐中的酯化反应中有机酸以及酸酐的添加量对最后产物纤维素醋酸丁酸酯中乙酯或者丁酯取代度的影响，提出纤维素在丁酸/乙酸/丁酸酐中的酯化反应经历一个混和酸酐以及乙酰碳正离子、丁酰碳正离子的生成过程。

Carboxy methyl chitosan which has a good water-solubility, moreover has stronger antibacterial activities than chitosan.

为了提高棉织品的抗菌保健功能，已有不少壳聚糖改性研究工作，如羧甲基壳聚糖，它不仅具有较好的水溶性，而且比壳聚糖具有更强的抗菌性。

It has been reported that F185K and C280S mutations of HIV1 integrase would improve the enzyme solubility, and the catalytical activity of the enzyme was the same as that of the wildtype enzyme in vitro.

coli中进行整合酶基因表达，SDSPAGE鉴定表达产物，亲和层析纯化蛋白，酶联免疫吸附实验方法测定整合酶的生物学活性。

Compared to BMVC,9E-BHVC has many better features needed by a two-photon probe,such as larger two-photon action cross sections,stronger affinity to DNA and better water-solubility.These excellent properties of 9E-BHVC all mentioned above imply that it would be a true two-photon nucleic acid fluorescent probe if it can specially recognize the DNA in complex cellulous environment.So this dissertation has investigated the ability of 9E-BHVC on the cell nucleus imaging detaily.

与BMVC相比，9E-BHVC表现出作为双光子荧光探针更好的特性，例如具有更大的活性吸收截面和更高的结合常数，且具有更好的水溶性。9E-BHVC这些优良的性质预示着该分子如果能够在复杂的细胞环境中特异性地识别DNA，那么它将是真正意义的双光子核成像探针。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。