查询词典 free radical

Superoxide dismutase (EC 1.15.1.1;SOD) is a metal-containing enzyme that widely exist in organisms. It catalyzes the dismutation of superoxide free radical and produces hydrogen peroxide and oxygen.It plays an important role in protecting the plasmalemma from the reactive oxygen species.A recombinant plasmid pPICZA-sodM18 was constructed and after its linearization was transferred into chromosome of Pichia pastoris GS115 by electroporation.

超氧化物歧化酶(Superoxide dismutase；EC 1.15.1.1；SOD)是广泛存在于生物体内的金属酶，是机体内唯一以超氧阴离子自由基(O_2~-)为底物的酶，它能专一地催化O_2~-的歧化反应，生成过氧化氢和氧气，能有效的抵御氧自由基和其他氧化物自由基对细胞质膜的毒性，对机体防御氧化损伤起着十分重要的作用。

The results indicate that the three metal complexes could catalyze the disproportionation of the superoxide anion free radical O2(superscript -, and could be used as the active center model complexes of SOD.

结果表明，3种金属配合物均有一定的催化歧化超氧阴离子自由基O2(上-活性，均可被称作超氧化物歧化酶活性中心的模拟配合物。

Aniline compounds containing heptafluoroisopropyl was synthesized through taking sodium dithionite as evocating agent, and introducing heptafluoroisopropyl by free radical electrophilic substitution on benzene ring.

以连二亚硫酸钠为引发剂，在苯环上通过自由基亲电取代反应引入七氟异丙基，合成了一系列含七氟异丙基的苯胺类衍生物，研究了各种条件对反应的速度和收率的影响。

They have a wide of biological effects, including antioxidation, free radical scavenger and chelators of divalent cations etc.

其中，槲皮素是很强的单线态氧的猝灭剂，能有效抑制单线态氧引起的对类胡萝卜素的破坏。

Flavonoids can act as antioxidants, free radical scavengers, and chelators of divalent cations and have a wide range of biological effects .

类黄酮是一组化学结构和性质上不同的多酚化合物，具有抗氧化、自由基清除和二价阳离子螯合作用，具有广泛的生物学功能。

And the content of the free radical was affected by the dose and dose rate and declined with the prolong of time.

电子束辐照产生的极性含氧基团和自由基为UHMWPE纤维的表面接枝改性奠定了基础。

The general situation of the human body is in constant free radical generation and the dynamic equilibrium constant of the elimination.

一般情况下人的机体是处于自由基不断产生和不断消除的动态平衡之中。

There was the apoptosis of neurocyte companied the chicken encephalomalacia. The number of apoptosis was affected not only by the content of free radical but also by the function of anti-oxidant system.

在雏鸡发生脑软化的过程中伴有神经细胞凋亡的现象，神经细胞凋亡的数量不仅受体内自由基含量的影响，同时也受到机体抗氧化系统功能的影响。

The trial model with chicken encephalomalacia was set up by using the feed of low congtent of V〓 and supplying excessive unsaturated fatty acid in feed for studying the molecular mechanism of chicken encephalomalacia in the study. On the basis of observing the symptom and postmortem examination in clinic and determining the content of V〓, the bodyweight, the weight of cerebrum and cerebellum, the focus of the study was on follows which were relative to neuropathic injury. The concentration of free radical and the function of antioxidant defense system of chicken with encephalomalacia were determined systematically.

中文题名雏鸡脑软化症的分子机理副题名外文题名 The molecular mechanism of chicken encephalomalacia 论文作者王振勇导师石发庆教授学科专业临床兽医学研究领域\研究方向动物营养代谢病学位级别博士学位授予单位东北农业大学学位授予日期2002 论文页码总数110页关键词雏鸡脑软化鸡馆藏号BSLW /2003 /S858 /7 为了深入探讨雏鸡脑软化症发病的分子机理，本课题通过在采用低V〓饲料和添加过量UFA建立了雏鸡脑软化症实验模型。

Its mechanism of causing illness is very complicated, think at present that may relate to the following factors: Endocrinopathy , heredity , medicine , cosmetics,, oxygen free radical , ultraviolet ray shine, organism systemic pathological change ,etc.

它的发病机制十分复杂，目前认为可能与下列因素有关：内分泌失调、遗传、药物与化妆品、氧自由基、紫外线照射、机体系统性病变等。

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。