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自由基
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  free radical (
     1. Oxygen free radical scavenging-effect in vitro by Q,I,R Hydroxyl free radical(·OH) was generated using H_2O_2/Fe~(2+) system via Fenton reaction;
     1. Q,I,R体外清除氧自由基作用采用H_2O_2/ Fe~(2+)体系,通过Fenton反应生成羟自由基(·OH);
短句来源
     1. In vitro free radical models: (1) Preparation of models: Hydroxyl free radical (·OH) was generated using H_2O_/Fe~(2+) system via Fenton reaction, superoxide anion ((O_2~·)~- ) using pyrogallol auto-oxidation method.
     1.离体氧自由基模型:(1)模型制备:采用H_2O_2/ Fe~(2+)体系,通过Fenton反应生成羟自由基(·OH);
短句来源
     ObjectiveTo observe the effects of puerarin on activity of dimethylarginine dimethylaminohydrolase(DDAH)in human umbilical vein endothelial cells(HUVECs)cultured with oxidized free radical(OFR),to explore the effect of puerarin on metabolic mechanism of asymmetric dimethylarginine(ADMA).
     目的观察葛根素对氧自由基(oxidized free radical,OFR)培养的人脐静脉内皮细胞(human um-bilical vein endothelial cells,HUVECs)二甲基精氨酸-二甲基赖氨酸水解酶(di methylarginine di methy-laminohydrolase,DDAH)活性及表达的影响,以探讨葛根素对不对称二甲精氨酸(ADMA)代谢机制的影响。
短句来源
     Methods:The superoxide free radical (O -· 2) and hydroxyl free radical (·OH) were generated by the autooxidation system of pyrogallol and the system of 1,10 - phenathroline H 2O 2/Fe 2+, respectively.
     方法 :采用邻苯三酚自氧化体系产生超氧离子自由基 (O-·2 ) ,采用邻二氮菲 -Fe2 +氧化法检测H2 O2 /Fe2 +产生羟自由基 (·OH)。
短句来源
     Methods: 52 essential hypertensive patients and 29 normal subjects were randomly divided into 3 groups. Glucose (Glu), insulin (INS), superoxide dismutase (SOD), total antioxide capacity (T-AOC), anti-superoxide anion free radical (Anti O2。—) and free fatty acid (FFA) in fasting serum were measured after a 12-hour overnight fast.
     方法:52例高血压病(EH)患者和29例正常对照者(NS)随机分为3组,禁食12h后,抽取空腹静脉血测定血清中葡萄糖(Glu)、胰岛素(INS)、超氧化物歧化酶(SOD)、总抗氧化能力(T-AOC)、抗超氧阴离子自由基(Anti O2。—)及游离脂肪酸(FFA);
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  “自由基(”译为未确定词的双语例句
     The (2+1) REMPI Spectra of SF_2 Radical between 298 and 330 nm
     298~330nm范围SF_2自由基(2+1)REMPI光谱研究
短句来源
     The generating rule of hydroxyl radical of Fenton,UV/Fenton and UV/Fe(C2O4)33-/H2O2 system was investigated by using spectrophotometric method.
     采用分光光度法研究Fenton、UV/Fenton和UV/Fe(C2O4)33-/H2O2系统中羟自由基(.OH)的生成规律.
短句来源
     The title compound [Cu(NIT2Py)2(N3)2] [NIT2Py = 4,4,5,5-tetramethyl-2-(6'-methyl-2'-pyridyl) imidazoline-1-oxyl-3-oxide] was prepared and structurally characterized.
     本文合成了邻位吡啶自由基(NIT2Py)和铜的配合物[Cu(NIT2Py)2(N3)2][NIT2Py=2-(2’-吡啶基)4,4,5,5-四甲基咪唑啉-3氧化-1-氧基自由基],并测定了晶体结构。
     Theoretical Calculation of Reaction Mechanisms for ~·C_ 3H_ 5+O_ 2
     烯丙基自由基(~·C_3H_5)与氧气(O_2)反应机理的理论计算
短句来源
     The capacities of scavenging DPPH· (SichuanSC50=4 1961× 10- 4mg/mL, ShanxiSC50=3 1995× 10- 4mg/mL)and O· (SichuanSC50=7 2461× 10- 4mg/mL, ShanxiSC50=8 0848× 10- 4mg/mL) of tartary flavone were superior to Jilin buckwheat flavone.
     清除二苯代苦味酰基自由基 (川 SC50=4 1961× 10- 4mg/mL,晋 SC50=3 1995× 10- 4mg/mL)和超氧化阴离子自由基 (川 SC50=7 2461× 10- 4mg/mL,晋 SC50=8 0848× 10- 4mg/mL)的能力要强于甜荞黄酮;
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  相似匹配句对
     FREE RADICAL'S SCAVENGING
     自由基的清除
短句来源
     A great number of singlet oxygen and free radicals produced in the process.
     自由基(ROO·、HO·);
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     2 VE weakened the influence that passive smoking reduced body weight andobviously decreased the mortality of passive smoking mice.
     (2)清除体内的自由基;
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  free radical (
Water-borne raspberry-like PMMA/SiO2 nanocom-posite particles were prepared via free radical copolymerization of methyl methacrylate (MMA) with 1-vinylimidazole (1-VID) in the presence of ultrafine aqueous silica sols.
      
Graft copolymers of hydroxylethyl cellulose (HEC) and PAA were prepared by free radical polymerization.
      
Results showed that the process has good characteristics of living free radical polymerization, i.e.
      
time both were linear indicating that the reaction was a controlled/living free radical polymerization.
      
Results showed that the process had some of the good characteristics of controlled/living free radical polymerization.
      
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An attempt was made by Hodgson to introduce alkyl or aryl group into aromatic ring through the reaction between aryldiazonium chloride [(Ar N_2 Cl)_2·ZnCl_2] and Grignard reagent (RMgX). Among the reaction products, however, he found Ar·Ar, Ar·H, ArN=NAr, ArN=N·R, Ar·X present in various proportions, but no Ar·R as expected. According to the result of an recent investigation of A. N. Nesmeyanov, the thermal decom- position of aryldiazonium fluoroborate afforded aryl cation, while the diazonium salt of other...

An attempt was made by Hodgson to introduce alkyl or aryl group into aromatic ring through the reaction between aryldiazonium chloride [(Ar N_2 Cl)_2·ZnCl_2] and Grignard reagent (RMgX). Among the reaction products, however, he found Ar·Ar, Ar·H, ArN=NAr, ArN=N·R, Ar·X present in various proportions, but no Ar·R as expected. According to the result of an recent investigation of A. N. Nesmeyanov, the thermal decom- position of aryldiazonium fluoroborate afforded aryl cation, while the diazonium salt of other types gave aryl radical under the same conditions. The author caused the aryl diazonium fluoroborates to react with the less reactive organo-metallic compounds, namely, ethyl mercuric chloride and diethyl mercury. In contrast to the author's expectation, no ethylaryls were found, but diaryls (Ar·Ar), aryl- chlorides (Ar·C1) and aromatic hydrocarbons (Ar·H), and diaryls, ethyl mercuric fluoroborates, aromatic hydrocarbons and free mercury were found respectively as reaction products. In each case, tar was formed in considerable amount, especially when the decomposition was carried out with diethyl mercury.

Hodgson等曾企圖利用重氮鹽的氯化鋅的複鹽與Grignard試劑反應,希望能將烴基引入芳香環;伹在反應產物中,並無所預期的芳香烴,而有不同此例的Ar·Ar,Ar·H,ArN=N·Ar,Ar·N=N·R及Ar·X。根據最近等對芳香基氟硼酸重氮鹽的研究,證明芳香基氟硼酸重氮鹽在分解時產生烴離子,而與其它重氮鹽產生烴自由基者不同。作者因此利用芳香基氟硼酸重氮鹽及較Grignard試劑的活潑性小的有機汞化合物來代替芳香基重氮鹽的氯化鋅複鹽及Grignard試劑。在反應產物中,並無乙基芳香烴存在;生成的是不同量的Ar·Ar,Ar·H,Ar·Cl等,結果與Hodgson的實驗基本上相同。

The first step in caprolactam polymerization is an addition polymerization. The authors have studied the initiative influence of various substances on the polymerization and obtained the following results. The initiators of the free radical type, such as benzoyl peroxide and hydrogen peroxide together with their redox systems, all exerted no effect on caprolactam. While carboxylic acids gave only weak initiative effect in absence of water and amines gave no action, the mixtures of acids and amines and of acids...

The first step in caprolactam polymerization is an addition polymerization. The authors have studied the initiative influence of various substances on the polymerization and obtained the following results. The initiators of the free radical type, such as benzoyl peroxide and hydrogen peroxide together with their redox systems, all exerted no effect on caprolactam. While carboxylic acids gave only weak initiative effect in absence of water and amines gave no action, the mixtures of acids and amines and of acids and water initiated the polymerization rapidly. Amino-acids of various types also gave rapid initiation. 6-Benzoyl-amino-caproic acid was found to be far inferior in the initiative activity than benzoic acid. Trimethylphenyl ammonium iodide did not initiate the polymerization, and attempt to polymerize N-methyl caprolactam gave negative results.From these facts, the polymerization of caprolactam is clearly neither of free radical nor of step-wise addition mechanism. The authors suggest that the initiation is exerted by both the cation and anion of the initiator. These ions activate the amide grouping by a proton transfer mechanism, which causes caprolactam to polarize in the type of a zwitter-ion and thereafter polymerization proceeds.

己內醯胺聚合的最初階段為加成聚合。作者研究若干種化合物,試驗它們對己內醯胺聚合的引發作用。結果,自由基型的引發劑如過氧化苯甲醯,過氧化氫和它們的氧化還原體系,均不能引發己內醯胺的聚合。羧酸在無水存在時其引發作用甚弱。胺類則缺乏引發效應。但羧酸与胺同時存在時能迅速的引起己內醯胺的聚合。氨基酸不論何種類型均有迅速的引發作用。苯甲醯胺基己酸的引發作用遠較苯甲酸為差。碘化三甲基苯基銨(季銨鹽)不能引發己內醯胺的聚合,而N-甲基己內醯胺也不能用這些引發劑引起聚合。根據以上結果,己內醯胺聚合顯非自由基型的聚合,亦非引發劑与單體的逐步加成。作者建議引發劑的正負兩種離子都有影響。引發機構是由於氫原子的轉移,使己內醯胺發生雙離子式的極化,因而發生聚合。

A mathematical analysis of the kinetics of free radical addition polymerizations with various types of initiation mochanism (catalysed, thermalchemical and photochemical initiations) is given by solving the systems of differential equations and therefore, we obtain the theoritical distritutions for various kinds of polymer which have been yielded in the chemical reactions of free radical addition polymerizations and also the three kinds of average molecular weight. As to the assumption of stationary state, we...

A mathematical analysis of the kinetics of free radical addition polymerizations with various types of initiation mochanism (catalysed, thermalchemical and photochemical initiations) is given by solving the systems of differential equations and therefore, we obtain the theoritical distritutions for various kinds of polymer which have been yielded in the chemical reactions of free radical addition polymerizations and also the three kinds of average molecular weight. As to the assumption of stationary state, we know that it has been widely used to investigate the kinetics of polymerizations, but there is still lack of rigorous analysis of the assumption. In this article, the basic condition for the validity of stationary state is derived and it is readily proved that, for the reactions of free radical addition polymerizations, the stationary state method is applicable.

我们讨论了热、光和催化剂分解引发的加聚反应动力学,结合自由基型加聚反应的特性,得到了动力学方程粗的解,推导出链段分布和平均分子量公式,证实稳定态假定对于自由基型加聚反应是可以应用的.

 
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