查询词典 hydroxy radical

The side-chain liquid crystal polymacrylate was synthesized by free radical polymerization form the acrylate monomer which was generated from p-hydroxy benzoic acid, ethylene chlorohydrin and acrylic acid by etherification, esterification and chloration.

以对羟基苯甲酸、氯乙醇和丙烯酸为主要原料，经醚化、酯化和酰氯化反应合成了中间体和含液晶基元的丙烯酸酯单体，后者经自由基聚合合成了聚丙烯酸酯侧链液晶聚合物。

Generation of product was observed under340～370nm in the reaction of rutin and α-hydroxy ethyl peroxyl radical. The observed1st order build-up and decay of the new product was calculated to be (1.11±0.08)〓, respectively.

在340～370nm观察到了芦丁与有机过氧自由基反应体系中新物质的生成，并计算得到了新物质生成和衰变的的表观一级反应速率常数分别为〓和〓。

In currence, se- GSH- PX activity have been been used as a standard of Selenium nourishment, GSH- PX is an extremely important protection enzyme in anti oxida- tive defend system of organize and cell of animal.It clear hydroxy radical and hyperoxide in cell respir- ation metabolism reaction ,thereby, mai- ntain cell's normal physiological function, prote- ct biomembrane and biomacromolecule from oxidative damage.If the activity is high or not, effect the ab- ility that the organize clears hyperoxize lipi- d ,directly.

目前，含se-GSH-PX活性已被作为se营养状况可一个指标，该酶是动物组织细胞抗氧化防御系统中一个极为重要的保护性酶，它是以还原型GSH为底物的谷胱甘肽参与的过氧化反应，清除细胞呼吸代谢反应过程产生的羟自由基和过氧化物，从而使细胞能维持正常的生理功能，保护生物膜和生物大分子结构免受氧化损伤。

Constituting dicycle; 2. region selectively reducing six-membered ring ketocarbonyl radical; 3. introducing 7alpha-hydroxy group; 4. Aldol reaction to introduce side chain and obtain 8alpha-hydroxy group; 5. oxidizing the position 7 hydroxy group into ketone; 6. turning the configuration of the position 7 hydroxy group; 7. glycosidating the position 7 hydroxy group; and 8. eliminating protecting group to obtain the target compound.

该方法包括如下步骤：(1)双环的构建；(2)区域选择性还原六元环酮羰基；(3)7α-羟基的引入；(4)Aldol反应引入侧链，同时得到8α-羟基；(5)7位羟基氧化为酮；(6)7位羟基构型的翻转；(7)7位羟基的糖苷化；(8)脱除保护基得到目标化合物。

In this paper the thymus DNA of calf and the pBs plasmid are the main objects of our studies in ultraweak luminescence. By means of PIAS(Photon-counting image acquisition), ultraweak luminescence detector and Lambda Bio 40 of UV/VIS spectrophotometer, we studied the UL of DNA induced by the three oxygen free radicals: singlet oxygen Oa, hydroxy radical and superoxide anion(O2 ). We found that the OH can greatly increase the UL intensity of DNA.

本论文以小牛胸腺DNA和质粒pBs为实验材料，利用光子图像探测系统(Photon-counting image acquistion，PIAS)、微弱发光测量仪和UV／VIS分光光度计和生物统计学的成组比较法原理对单线态氧(~1O_2)、羟自由基、超氧阴离子(O_2~-)三种氧自由基诱导DNA超弱发光的变化过程进行了研究，结果发现这三种氧自由基中·OH能诱导DNA的超弱发光发生显著的增强变化，而其他两种氧自由基对DNA的超弱发光并无显著诱导作用。

Bilirubinic decomposition product has more powerful antioxidation than vitamin E;dissociative ferrum also plays roles on harmful product such as hydroxy radical and superoxide anion etc;As an important signal molecules,CO play significant roles on neuron information transfer and vascular tone regulation;people pay attention to HO,which is the main enzymatic system producting endogenous CO increasingly.

其中胆绿素的分解产物具有较维生素E更强的抗氧化作用；Fe~(2+)参与催化生成有害的活性氧代谢物，如羟自由基，超氧阴离子等；CO作为一种气体信使分子，在神经元信息传递和血管紧张度调节中起重要作用，HO作为产生内源性CO的主要酶系统日益受到关注。

And the ability of antioxidant of polyhydroxy benzamides don't have too many differences with Trolox (IC50 =13.90 μg/ml), the substition of hydroxy group at amino benzene ring doesn't affect the whole ability of antioxidant apparently, but while the single hydroxy group at carboxylic acid benzene ring, they are apparently decrease to scavenge the ability of free radical, as a result, the hydroxy at amino benzene ring substitutes its function, without the hydroxy group, the ability of antioxidant is worst, but it upgrades its function while the hydroxy and amino are in the ortho-position or para-position.

而当多酚醯胺化合物其抗氧化能力与Trolox差不多时(IC50 =13.90 μg/ml)，胺基苯环上之羟基取代对整体抗氧化能力影响不明显，但在羧酸苯环上具单羟基时，其清除自由基能力明显下降，使得胺基苯环上羟基取代发挥了影响力，无羟基取代时，抗氧化能力最差，而羟基与胺基互为邻位或是对位时较间位有提升效果。

OBJECTIVE To study the effects of aloe-emodin and emodin on scavenging superoxide anion free radical O(superscript – subscript 2 and hydroxy free radical.

目的：研究芦荟大黄素和芦荟素对超氧阴离子自由基O(上标–下标 2、羟自由基的清除作用。

Methods The pyrogllol auto-oxidation was adopted to produce superoxide anion O(superscript - subscript 2; the system H2O2/Fe(superscript 2+) was used to produce hydroxy radical through Fenton reaction; and spectrophotometry was used to detect the clearing functions of drugs with different concentrations against O(superscript - subscript 2) and OH.

采用邻苯三酚自氧化法产生超氧阴离子自由基O(上标-下标 2，采用H2O2/Fe(上标 2+)体系通过Fenton反应产生羟自由基，用分光光度法分别测定不同浓度的药物对O(上标-下标 2)是和OH的清除作用。

In the second part, quantum chemical AM1 methods were employedto theoretically investigate the electronic structures of maleic anhydride in ground- and excited-states. On basis of the frontier orbital theoryand three bonding principles, the possibility of reaction of active α-hydroxysuccinic anhydride carbanion and active α-hydroxy-succinic anhydride radical on polymerization process of MArespectively by alkali catalyst and by hydroxyl radical was discussed. Theanionic and radical polymerization of MA discussed also. Theoreticalstudies show that both polymerization products of MA are in the chainstructures, corresponding to the experimental findings.

第二部分用量子化学AM1方法，计算研究了马来酸酐的基态和激发态电子结构；应用前线轨道理论和成键三原则分别探讨了碱催化条件下和羟基自由基引发下马来酸酐均聚合过程中α-羟基丁二酸酐碳阴离子和α-羟基丁二酸酐碳自由基活性中间体参与反应的可能性及由它们引发的马来酸酐阴离子聚合反应机理和自由基引发聚合反应机理；理论研究表明马来酸酐的均聚合产物均为链式结构，与实验事实相相符。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。