查询词典 derivative

Objective To investigate the possibility of self-assembling gene nanoparticles between the amphiphilic chitosan derivative and plasmid DNA, and study the interaction mechanism between N -methylene phosphonic chitosan and plasmid DNA, which might provide a new strategy for developing safe and efficient non-viral vectors.

目的 探讨双亲性壳聚糖衍生物与质粒DNA通过自组装的方式形成基因纳米粒子的可行性，考察载体与质粒DNA的相互作用机制，为开发安全高效的非病毒载体提供新的途径。

The obtained potential energy curves disclosed that a four-state cycle existed in the ground and excited states. It was also found that the activation energy for the methyl transfer was higher compared to the phenyl transfer, which was consistent to the experimental results that the photoisomerization of the phenyl substituted derivative was more rapid than the methyl substituted derivatives.

对反应势能面的研究发现，在光异构化反应中化合物M21和M21、M31的基态和激发态虽然都可以构成四能级反应过程，但由于M21异构化过程的活化能较高，使其所构成的四能级反应难以进行，这就从理论上解释了迁移基团为甲基的M21变色性能低于迁移基团为苯基的M31的实验结果。

Amino-monomethoxypoly(ethy1ene glycol)(mPEG-NH2) was synthesized based on the principle of Gabriel synthesis.Monomethoxypoly(ethy1ene glycol) tosylate was prepared at first,and then reaction with potassium salt of phthalimide as nucleophile to produce the monomethoxypoly(ethy1ene glycol)phthalimide derivative.

摘 要：首先合成了单甲氧基聚乙二醇对甲苯磺酸酯，然后根据盖布瑞尔合成法原理，以邻苯二甲酰亚胺钾盐为亲核试剂与mPEG-OTs反应，生成单甲氧基聚乙二醇的邻苯二甲酰亚胺衍生物，mPEG-PI与水合肼反应肼解生成伯胺，合成了一端为氨基的单甲氧基聚乙二醇(mPEG-NH2)。

A triarylamine-based picolinic acid was synthesized through the Ullmann reaction and Negishi coupling reaction. Using this class of picolinic acid derivative as an auxiliary ligand and 1-phenylisoquinoline as a cyclometalated ligand, a cyclometalated iridium complex was also prepared.

通过Ullmann反应和Negishi偶联反应，合成了一种含三芳胺功能基的吡啶-2-甲酸衍生物；并以此为辅助配体、1-苯基异喹啉为环金属配体，设计合成了一种新型环金属铱配合物。

A triarylamine-based picolinic acid was synthesized through the Ullmann reaction and Negishi coupling reaction. Using this class of picolinic acid derivative as an auxiliary ligand and 1-phenylisoquino-line as a cyclometalated ligand, a cyclometalated iridium complex was also prepared.

通过Ullmann反应和Negishi偶联反应，合成了一种含三芳胺功能基的吡啶－2-甲酸衍生物；并以此为辅助配体、1-苯基异喹啉为环金属配体，设计合成了一种新型环金属铱配合物。

In the study of testing the overall ability of anti-oxidation, polyhydroxy substituted N-benzoylserotonin derivatives (compound 1-10) still have the better overall ability of anti-oxidation than control group, trolox. The IC50 values of compound 1-10 range 2.49 to 3.92, while the IC50 value of trolox is 5.23 μg/ml. Compound 10 is still the best derivative which has the best overall ability of anti-oxidation; IC50 value is 2.49 μg/ml.

而在总抗氧化能力结果显示，相较於对照组水溶性维生素E之IC50值5.23 μg/ml，多羟基取代之N-色洛冬宁苯甲醯胺衍生物（化合物1 ~ 10）之总抗氧化能力效果IC50值介於2.49 ~ 3.92 μg/ml之间，十种醯胺化合物的总抗氧化效果皆比对照组水溶性维生素E的抗氧化效果还要来得优越，其中效果最强的仍为化合物10，其 IC50值为 2.49 μg/ml。

In view of the fact that the shell polyose and the derivative have the fine biological activity and the function health care function.

鉴于壳聚糖及其衍生物具有优良的生理活性和功效保健作用。

Porphyrins is a general term of the homologue and derivative of porphine with substituting groups at the outside ring, becoming metalloporphyrins promptly after two protons on its nitrogen are replaced by the metal ion.

卟啉是卟吩环外带有取代基的同系物和衍生物的总称，当其氮上两个质子被金属取代后即成金属卟啉。

Not only it can lead to water function obstacle, affect breed aquatics and sightseeing, but also the algae toxin and derivative it procreant are seriously harmful to health,survival and multiplication of people.

水体富营养化不仅造成水环境功能障碍，影响养殖和景观旅游，其产生的藻毒素及衍生物对人体健康和生存、繁衍存在着严重危害。

The wall-broken Cole bee pollen lOOg is extracted by 1:10 of anhydrous ethanol , continuously stirred in darkness for two hours. And then by means of centrifuge, cleaning, vacuum concentration, adjusting pH value, anion exchange resin chromatography, propanone extraction,being blown to dry and freeze-dried, we use HPLC to detect the content of the GA derivative of the freeze-dried powder.

将破壁油菜蜂花粉100g，在避光条件下用无水乙醇(料液比1：10)连续搅拌浸提2小时，浸提液经离心、洗涤、真空浓缩、pH值调节、阴阳离子树脂交换、乙酸乙酯萃取、吹干再冻干后用HPLC法分析，得冻干样品中赤霉素衍生物的含量为51.29％。

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