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oh
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  · oh radical
     ·OH radical:pH=7.5, T=49.9, E/S=2.1 %、t=2.0 h,with the activity of i=93.97 %.
     (3)当pH=7.58、T=49.95℃、E/S=2.10 %、t=2.03 h,酶解液清除·OH的能力最强,清除率i=93.97 %。
短句来源
     Chemical luminometry, spectrometry and electronic spin resonanc e (ESR) methods were used to measure the scavenging action of deoxyribonucleic ac id (DNA) from carp spermary on ·OH radical produced by Cu2+-Vit C-H2O 2 chemoluminescent system, O÷2 radical produced by the breathing burst of polymorphonuclear leukocytes (PMNs) and DPPH radical respectively.
     方法:采用 化学发光法测定鲤鱼精巢DNA对Cu2+-Vit C-H2O2发光体系产生的·OH自由 基的清 除作用,采用分光光度法检测鲤鱼精巢DNA对大鼠腹腔多形核白细胞(PMNs)呼吸爆发产生O ÷2自由基的清除作用,采用电子自旋共振(ESR)法测定鲤鱼精巢DNA对DPPH有机自由基的 清 除作用。
短句来源
     Under alkaline conditions, the reaction of ·OH radical and 2-chlorophenol produces o-chlorinated phenoxyl radical with a rate constant of 1.0×10 9 \{L·mol -1·s -1\};
     研究表明 ,· OH自由基与 2 -氯酚在碱性条件下可直接反应生成邻氯代酚氧自由基 ,速率常数为 1 .0× 1 0 9L· mol- 1 · s- 1 ,也有部分· OH自由基与 2 -氯酚反应先生成 OH-加合物 ,再进一步消除水分子生成邻氯代酚氧基 ;
短句来源
     There are six pathways of the reaction of CF_3CH_3 with ~·OH radical: direct hydrogen abstraction, direct fluorine abstraction, CF_3 substitution, CH_3 substitution, fluorine substitution and hydrogen substitution. Four substitution reactions are S_N2 reaction.
     CF3CH3与·OH自由基的反应有6个通道:直接H抽提反应、直接F抽提反应、取代CF3反应、取代CH3反应、取代F反应和取代H反应,其中4个取代反应均为SN2型的取代反应.
短句来源
     It is primarily the reactions between ·OH radical and 4-chlorophenol that contribute to the dechlorination of 4-chlorophenol in aqueous solution in plasma.
     在等离子体条件下,水相中4 氯酚的脱氯主要是与·OH自由基作用的结果.
短句来源
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  “·oh”译为未确定词的双语例句
     ESR STUDY of the SCAVENGING EFFECTS of NATURAL PRODUCTS of RUTIN etc SUPEROXIDE and HYDROXYL RADICALS
     芦丁等天然产物清除活性氧自由基O_(?)~-和·OH的ESR研究
短句来源
     An ESR Study on OH-radical Scavenging Activity of Water-soluble Fullerenols
     富勒醇清除·OH自由基的ESR研究
短句来源
     ESR STUDY ON THE EFFECT OF BISPORIC MUSHROOM ON SCAVENGING HYDROXYL RADICAL AND PROTECTING 5'-TMP AGAINST IRRADIATION
     双孢菇清除·OH自由基作用及对胸腺嘧啶核苷酸(5'-TMP)辐射防护作用的ESR研究
短句来源
     Pulse Radiolytic Study on Mechanism of the OH Radical Induced Oxidation of Phosphorylmethionine in Aqueous Solution
     ·OH诱导氧化磷酰化甲硫氨酸机理的脉冲辐解研究
短句来源
     MECHANISM OF PRODUCTING H2O2 AND ·OH BY ECS AND ITS APPLICATION TO ORGANISM DEGRADATION
     电催化产生H_2O_2和·OH机理及在有机物降解中的应用
短句来源
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  相似匹配句对
     The activity of OH-.
     OH.
短句来源
     OH,O_2~-.
     OH、(?)
短句来源
     and ·OH of the extract of bamboo was detected by chemiluminescence.
     和·OH 的能力。
短句来源
     Determination of Hydroxyl Radical Using Phenylfluorone by Fluorimetry
     苯基荧光酮光度法测定·OH
短句来源
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  oh
These results suggest that dialkylamino and appropriately substituted benzene rings (NO2, 8; OH, 9) are bioisosteric replacements for pyrrolidine and pyridine, respectively.
      
By Mazur's Theorem, the existence of solutions of the optimal control problem (OH) is demonstrated.
      
The first order necessary conditions of optimality for problem (OH) is obtained by the conception of normal cone.
      
Finally, under suitable assumptions, the uniqueness of solutions of the optimal control problem (OH) is given.
      
Hydroxyl-term inated (HPAEK-OH) and fluoro-terminated (HPAEK-F) hyperbranched poly(aryl ether ketone)s were prepared by using different A2/B3 mass ratio.
      
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When ceric iodate is precipitated from acid solution by the addition of asoluble iodate,a gelatinous precipitate is obtained,which is difficult to filterand wash.The precipitate must be redissolved and reprecipitated as oxalatefor final ignition to ceric oxide.A method has been deviced to improve the form of the ceric iodateprecipitate by slow precipitation in homogeneous solution.Advantage is takenof the fact that cerium exists in two distinct valence states,the cerous and theceric.Cerous iodate is soluble...

When ceric iodate is precipitated from acid solution by the addition of asoluble iodate,a gelatinous precipitate is obtained,which is difficult to filterand wash.The precipitate must be redissolved and reprecipitated as oxalatefor final ignition to ceric oxide.A method has been deviced to improve the form of the ceric iodateprecipitate by slow precipitation in homogeneous solution.Advantage is takenof the fact that cerium exists in two distinct valence states,the cerous and theceric.Cerous iodate is soluble in dilute acid solution,while ceric iodate isinsoluble.Cerium is first reduced to the cerous state by hydrogen peroxide innitric acid solution.Ammonium iodate is added and no precipitation occurs atthis moment.The precipitation is brought about by the slow formation ofceric ion in the iodate solution by ammonium persulfate.Thus a denseprecipitate is formed slowly.This compact volume of the precipitate facilitatesfiltration and washing.The precipitate is ignited directly to ceric oxide,part of which is always stained with a brown color.This is remedied by evapora-tion of the ignited precipitate to dryness with a few drops of concentratedsulfuric acid and ignition to ceric oxide for final weighing.For samples containing 10-50 mg of ceric oxide,a total volume of 300-400 ml gives best results.The optimum concentration of the nitric acid presentis 0.4-0.5 N.A starting temperature of 40-60℃ favors the denseness of theprecipitate.Precipitation is continued at an elevated temperature(70-80℃ )on a hot plate.Stirring not only improves the crystallinity of the precipitateand may decrease the occlusion of impurities,but also shortens the time forcomplete precipitation.Dilute iodic acid solution(1-2%)is used as washsolution.This method is good for samples containing 2.5-250 mg of cericoxide.The composition of the precipitate is not reproducible.The precipitate is abasic iodate and the ratio of IO_3~-found/IO_3~- theoretical for Ce(IO_3)_4 increaseswith the concentration of the nitric acid present(up to 0.5 N)to a maximumvalue of about 0.92.The ratio never reaches unity.An analysis of the pre-cipitate dried at 40-45℃ for 2-3 days shows a fairly constant ratio of IO_3~- found/IO_3 theoretical for Ce(IO_3)_4 From the ratio of Ce:IO_3,an approximate formulaCe_2(IO_3)_7(OH)·XH_2O has been proposed for the precipitate obtained under theconditions described.The number of water molecules in the formula is in-definite,varying from 3 to 5.

1.在均匀溶液中沉淀的碘酸铈,性质紧密,便利于过滤和洗涤。烧灼成为氧化铈后,适合于作为铈的定量分析。2.利用碘酸亚铈能溶解于稀酸溶液而碘酸铈则不溶的区别,先用过氧化氢把全部铈离子还原,再加入碘酸铵,然后进行氧化,使碘酸铈在均匀溶液中沉淀出来。3.本方法适用于含氧化铈2.5—250毫克的样品。4.所得沉淀的分子式经初步测定为 C_(e2)(IO_3)_7(OH)·x H_2O,其中 x 的数值不定,涨落在3与5之间。

Mu-feng-chin has been used as a diuretic and dropsic, etc. in Chinese medicine for many years. Four substances have been isolated by the author from a sample of Mu-fong-chi brought in Shanghai, and the details of the isolation and chemical properties of two of them, viz. Mu-fong-chin A and B, have been reported in previous papers of this series elsewhere. The present paper deals with Mu-fong-chin C, which has the molecular formula C_(18)H_(21)O_(10) and a melting point 180-181℃. Mu-fong-chin C was shown to be...

Mu-feng-chin has been used as a diuretic and dropsic, etc. in Chinese medicine for many years. Four substances have been isolated by the author from a sample of Mu-fong-chi brought in Shanghai, and the details of the isolation and chemical properties of two of them, viz. Mu-fong-chin A and B, have been reported in previous papers of this series elsewhere. The present paper deals with Mu-fong-chin C, which has the molecular formula C_(18)H_(21)O_(10) and a melting point 180-181℃. Mu-fong-chin C was shown to be a phenolic substance, it probably contains phenolic OH, methylenedioxy, aldehyde and methoxy groups.

提去木防巳甲乙二素的母液以醚去油、脂、蠟及色素等後,母液濃縮,以熟戊醇及热水交互處理,分離得一種棕黄色結晶。融點180—181℃,定名為木防巳丙素。分子式為C_(18)H_(21)O_(10)。其分子中可能含有酚性羟基、甲二氧基、醛基及甲氧基等,其初步暫定構造式為

Aureomycin (Ⅰ) on reduction with zinc-acetic acid gives desdimethylaminoaureomycin (Ⅱ) under mild conditions and desdimethylaminodesoxyaureomycin (Ⅲ) under more drastic conditions. Ⅱ can be converted into Ⅲ by further reduction. Treatment of Ⅰ, Ⅱ or Ⅲ with concentrated hydrochloric acid or methanolic HCl produces anhydroaureomycin (Ⅳ), desdimethylaminoanhydroaureomycin (Ⅴ) or desdimethylaminodes- oxyanhydroaureomycin (Ⅵ) respectively. Compound (Ⅴ) can be obtained from Ⅳ by hydrogenolysis, and, similarly, Ⅵ...

Aureomycin (Ⅰ) on reduction with zinc-acetic acid gives desdimethylaminoaureomycin (Ⅱ) under mild conditions and desdimethylaminodesoxyaureomycin (Ⅲ) under more drastic conditions. Ⅱ can be converted into Ⅲ by further reduction. Treatment of Ⅰ, Ⅱ or Ⅲ with concentrated hydrochloric acid or methanolic HCl produces anhydroaureomycin (Ⅳ), desdimethylaminoanhydroaureomycin (Ⅴ) or desdimethylaminodes- oxyanhydroaureomycin (Ⅵ) respectively. Compound (Ⅴ) can be obtained from Ⅳ by hydrogenolysis, and, similarly, Ⅵ from either IV or V. All the above compounds, (Ⅰ), (Ⅱ), (Ⅲ), (Ⅳ), (Ⅴ) and (Ⅵ), when subjected to zinc dust distillation, form naphthacene. A comparison of the ultra-violet absorption spectra of Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ and Ⅵ affords a supplementary evidence for the location of the angular-OH group in the structure of aureomycin.

金黴素(I)在冰醋酸與甲醇溶液中,用鋅粉氫解,在温和條件下,產生脫二甲胺金黴素(II);較劇烈條件下,則生成脫二甲胺脫羥金黴素(III)。III從II經鋅粉醋酸氫解得到。 I,II,III分別與濃鹽酸或甲醇鹽酸處理相應地得到脫水金黴素(IV),脫二甲胺脫水金黴素(V)及脫二甲胺脫羥脫水金黴素(VI)。脫水金黴素(IV)經鋅粉醋酸氫解亦產生V與VI。VI亦可從V製成。 I,II,III,IV,V或VI和鋅粉共同蒸餾,皆得到并四苯。 從紫外吸收光譜測定,對金黴素結構中二甲胺基及角羥基的位置有補充的說明。

 
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