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oxidation     
相关语句
  氧化
     Study on Functionalization of Saturated Carbon by Catalytic Oxidation
     催化氧化饱和碳原子功能化研究
短句来源
     Oxidative Dehydrogenation of butane over V-Mg-O Catalyst and Selective Oxidation of Lower Hydrocarbons Using Inert Inorganic Membrane Reactor
     V-Mg-O催化剂上丁烷氧化脱氢及惰性无机膜反应器中低碳烃类选择氧化的研究
短句来源
     The Electrochemical Behaviors of Sb Irreversible Adsorption on Pt Single Crystal Electrodes and Kinetics of Hcooh Oxidation
     Pt单晶电极表面Sb的不可逆吸附及性能与甲酸电催化氧化反应动力学
短句来源
     Studies on Selective Oxidation of Propane to Acrolein Over Ce-Ag-Mo-P-O Catalyst
     Ce-Ag-Mo-P-O催化剂上丙烷选择氧化制丙烯醛反应研究
短句来源
     A Study on Continuous Wastewater Treatment by Wet Air Oxidation in a Trickle-Bed Reactor
     滴流床反应器湿式氧化连续处理废水的研究
短句来源
更多       
  氧化反应
     The Electrochemical Behaviors of Sb Irreversible Adsorption on Pt Single Crystal Electrodes and Kinetics of Hcooh Oxidation
     Pt单晶电极表面Sb的不可逆吸附及性能与甲酸电催化氧化反应动力学
短句来源
     An Investigation on the Liquid Phase Oxidation of Toluene by Air
     甲苯液相空气氧化反应过程研究
短句来源
     Study on Coal Oxidation under Mild Conditions
     煤的温和氧化反应研究
短句来源
     Compressed Oxygen in Drug Stability Experiments and Evaluation of Antioxidants Using Oxidation Reaction Rate Constants
     药物对氧稳定性实验及抗氧剂氧化反应速率常数的测定
短句来源
     AN APPROACH TO THE OXIDATION REACTION MECHANISM OF CO ON La_(0.5)Sr_(0.5)MnO_3
     La_(0.5)Sr_(0.5)MnO_3上CO氧化反应机理的探讨
短句来源
更多       
  氧化作用
     CATALYTIC OXIDATION OF CH_4 AND CO OVER LaMn_(1-y) Fe_yO_3 CATALYSTS
     LaMn_(1-y)Fe_yO_3对CH_4和CO的催化氧化作用
短句来源
     Under the acid condition (pH=2.0~2.8),Fe 3+ has a good catalysis oxidation to SO_2;
     在酸性条件下(pH=2.0~2.8),Fe3+对SO2显示了良好的催化氧化作用
短句来源
     The results showed that when concentration of H 2S and content of oxygen were 1500-2500 mg/m3 and 5% respectively, Fe 2+, Zn 2+ and Mn 2+ had action of catalytic oxidation for purification of H 2S on liquid phase, their catalytic property in order from large to small was Fe 2+>Zn 2+>Mn 2+, and the catalytic property of Fe 2+ was larger greatly than two other ions.
     实验结果表明 ,对H2 S浓度在 15 0 0— 2 5 0 0mg m3 之间 ,氧含量为 5 %的H2 S尾气 ,Fe2 + 、Zn2 + 和Mn2 + 在液相中对H2 S具有催化氧化作用 ,其催化性能大小顺序为Fe2 + >Zn2 + >Mn2 + ,且Fe2 + 催化性能远远大于其他两种离子 ;
短句来源
     UV-Vis Spectroscopic Study on the Effect of Cu(Ⅱ)/H_2O_2 on Oxidation of DOPA
     铜(Ⅱ)/H_2O_2对多巴氧化作用的紫外-可见光谱研究
短句来源
     The catalytic oxidation of saturated hydrocarbon was achieved by using(NH 4) 6[PMo 4V 8O 37.5 ]· x H 2O and 6[PMo 4V 6O 37.5 ]· x H 2O.
     研究了 (NH4) 6[PMo4V8O3 7.5]·xH2 O和 [Bu4N6]6[PMo4V8O3 7.5]·xH2 O两种杂多酸催化剂在H2 O2 存在下 ,对饱和烃的活化及氧化作用 .
短句来源
更多       
  高温氧化
     High Temperature Oxidation Behavior of La_2O_3-Mo_5Si_3/MoSi_2 Composites
     La_2O_3-Mo_5Si_3/MoSi_2复合材料的高温氧化行为
短句来源
     OXIDATION BEHAVIOR OF Al_2O_3/TiB_2/SiC_w CERAMICCOMPOSITES
     Al_2O_3/TiB_2/SiC_w陶瓷材料的高温氧化行为
短句来源
     Oxidation of Ternary Cu-60Ni-10Al and Cu-60Ni-15Al Alloys at 800℃
     Cu-60Ni-10Al和Cu-60Ni-15Al三元合金在800℃的高温氧化行为
短句来源
     Mechanical properties and high temperature oxidation behavior of La_2O_3-Mo_5Si_3/MoSi_2 composite
     La_2O_3-Mo_5Si_3/MoSi_2复合材料的力学性能和高温氧化行为
短句来源
     Oxidation Behavior of NiAl-30.9Cr-3Mo-0.1Dy Alloy at High Temperature
     NiAl-30.9Cr-3Mo-0.1Dy合金的高温氧化行为
短句来源
更多       

 

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      oxidation
    On the basis of total acid hydrolysis, methylation analysis, periodate oxidation and NMR studies (1H and 13C) the structure of the repeating unit of the polysaccharide was assigned and indicated only α-(1→4) linked Glucan.
          
    The structural information of the glucan was achieved by chemical (hydrolysis, methylation, periodate oxidation) and spectroscopic (1H and 13C) analyses, indicated a repeating unit built up of (1→6)-linked D-glucose.
          
    Some attempts have been made to develop new methods.2 So in order to explore an alternative method, the key intermediate 4-benzoyloxy cyclohexanone obtained from 1,4-cyclohesanediol by its benzoylation followed by oxidation is used.
          
    Photocatalytic Oxidation of Aniline in the Gas Phase Using Porous TiO2 Thin Films
          
    The gas-phase photocatalytic oxidation of aniline on a new kind of porous nano-TiO2 composite films is investigated.
          
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    The anhydro ring in a-methyl 2:3-anhydro-4:6-benzylidene-D-allopyranosidehas been opened by the action of sodium benzylate to give 53% yield ofα-methyl 2-benzyl-4:6-benzylidene-D-altropyranoside and 9% of a-methyl 3-benzyl-4:6-benzylidene-D-glucopyranoside.After the removal of the benzy-lidene residue by acid hydrolysis,the position of attachment of the benzylgroup is determined by periodate oxidation.Catalytic hydrogenolysis of thebenzyl group gives the known α-methyl D-altroside and a-methyl D-glucosiderespectively...

    The anhydro ring in a-methyl 2:3-anhydro-4:6-benzylidene-D-allopyranosidehas been opened by the action of sodium benzylate to give 53% yield ofα-methyl 2-benzyl-4:6-benzylidene-D-altropyranoside and 9% of a-methyl 3-benzyl-4:6-benzylidene-D-glucopyranoside.After the removal of the benzy-lidene residue by acid hydrolysis,the position of attachment of the benzylgroup is determined by periodate oxidation.Catalytic hydrogenolysis of thebenzyl group gives the known α-methyl D-altroside and a-methyl D-glucosiderespectively and their constitutions are thus proved.While an ethylene oxide ring in a sugar molecule can be opened by alkaline reagents,such as sodium hydroxide,sodium methoxide,ammonia,etc,the use of sodium benzylate has the advantage that one of the hydroxylgroups is protected after the scission by the benzyl group which can in turnbe removed by catalytic hydrogenation.

    应用苯甲醇钠可以裂解α-甲基2∶3-内醚-4∶6-苯亚甲基-D-同侧醣氧六圜配醣物的醚环,生成53%的α-甲基2-苯甲基-4∶6-苯亚甲基-D-2-异侧醣氧六圜配醣物及9%的α-甲基3-苯甲基-4∶6-苯亚甲基-D-葡萄糖氧六圜配醣物。此两化合物的结构,应用水解除去苯亚甲基及接触氢解除去苯甲基后,证明是已知的α-甲基 D-2-异侧醣氧六圜配醣物,及α-甲基 D-葡萄糖氧六圜配醣物;苯甲基在醣分子中的衔接位置,则应用高碘酸钠氧化测定。

    (1) Sodium salt of reduced codehydrogenase I has been obtained in good yield as a dry powder from codehydrogenase I by reduction with alcohol and alcohol dehydrogenase. This preparation was stable for at least 5 months when kept dry at -15℃. (2) The properties of the particle-bound codehydrogenase I cytochrome reductase system in heart muscle preparation were found to differ considerably from those of the soluble enzyme as obtained by Mahler et al. Among other things, the affinity for cytochrome c of the particle-bound...

    (1) Sodium salt of reduced codehydrogenase I has been obtained in good yield as a dry powder from codehydrogenase I by reduction with alcohol and alcohol dehydrogenase. This preparation was stable for at least 5 months when kept dry at -15℃. (2) The properties of the particle-bound codehydrogenase I cytochrome reductase system in heart muscle preparation were found to differ considerably from those of the soluble enzyme as obtained by Mahler et al. Among other things, the affinity for cytochrome c of the particle-bound enzyme is much greater than the soluble enzyme. The Michaelis constant for cytochrome c of the former is only one twelfth of that of the latter.(Fig. 2A). (3) With either oxygen or excess cytochrome c as electron acceptor, it was found that the overall activity, in terms of rate of oxygen consumption or cytochrome c reduction, when both succinate and reduced codehydrogenase I were oxidized simultanously, did not represent the sum of the rates of oxidation when these two substrates were separately oxidized but equalled only the faster of the two separate oxidation rates(Fig. 5, Tables 1, 2). If 2,6-dichlorophenol indophenol was used as the electron acceptor, the overall rate of simultaneous oxidation of these two substrates was found to equal exactly the sum of the rates of separate oxidation(Table 3). (4) When either oxygen or excess cytochrome c was used as the electron acceptor, reduced codehydrogenase I and succinate each inhibited the rate of oxidation of the other(Figs 4, 6 & 7). Evidence has been presented to show that the inhibition of succinate oxidation by reduced codehydrogenase I is not due to the accumulation of oxaloacetate. (5) When malonate was also added to the reaction mixture, succinate no longer produced any inhibition of the oxidation of reduced codehydrogenase I(Fig. 8). (6) It is therefore concluded that in heart muscle preparation both succinate and reduced codehydrogenase I are oxidized by cytochrome c through a common, velocity limiting factor. This is in accordance with the view previously reached by some workers from studies on the action of certain inhibitors. However, it should be noted that in our experiments no agents which might produce any conceivable change in the colloidal structure of the enzyme system has been employed. (7) It should be emphasized that our results clearly show that great caution must be exercised in drawing conslusion on the role an enzyme might play in a complex enzyme system from studies of the properties of a solubilized enzyme. (8) It is believed that the competition of two enzyme systems for a common linking factor as demonstrated in this report has provided a new method for studies on the mutual relations of two or more enzyme systems.

    (一)本報告提供了一個從輔酶Ⅰ,用酶還原法製備還原輔酶Ⅰ的方法。我們所製得的還原輔酶Ⅰ鈉鹽乾粉,可以在低温保存數月而不被氧化。 (二)與心肌製劑中顆粒相結合的輔酶Ⅰ細胞色素還原酶系,和用乙醇抽出的水溶性的輔酶Ⅰ細胞色素還原酶的性質頗不相同。其中比較重要的不同點是對於細胞色素c的親力,前者遠大於後者,其米氏常數僅約為後者的十二分之一。 (三)用一心肌顆粒製劑作為材料,無論用氧或過量之細胞色素c作為氫受體,還原輔酶Ⅰ與琥珀酸同時氧化時的總速度,不等於二者分別氧化時速度之和,而僅等於其中氧化較快者單獨氧化時之速度。但如用[2,6]二氯靛酚作為氫受體時,二者共同氧化時之總速度完全等於二者分別氧化時速度的和。 (四)當用氧或過量之細胞色素c作為氫受體時,琥珀酸與還原輔酶Ⅰ能彼此互相抑制對方氧化的速度。有足夠的實驗材料說明,還原輔酶Ⅰ對於琥珀酸氧化的抑制,不是由於草醯乙酸聚集的緣故。 (五)如果在反應混合物中同時含有琥珀酸脫氫酶的專一抑制劑,丙二酸,則琥珀酸對於還原輔酶Ⅰ氧化作用的抑制即被解除。 (六)根據以上的實驗結果,可以認為,還原輔酶Ⅰ及琥珀酸先通過一個共同的因子與細胞色素c作用。這個共同的因子在一般情形之下,也是...

    (一)本報告提供了一個從輔酶Ⅰ,用酶還原法製備還原輔酶Ⅰ的方法。我們所製得的還原輔酶Ⅰ鈉鹽乾粉,可以在低温保存數月而不被氧化。 (二)與心肌製劑中顆粒相結合的輔酶Ⅰ細胞色素還原酶系,和用乙醇抽出的水溶性的輔酶Ⅰ細胞色素還原酶的性質頗不相同。其中比較重要的不同點是對於細胞色素c的親力,前者遠大於後者,其米氏常數僅約為後者的十二分之一。 (三)用一心肌顆粒製劑作為材料,無論用氧或過量之細胞色素c作為氫受體,還原輔酶Ⅰ與琥珀酸同時氧化時的總速度,不等於二者分別氧化時速度之和,而僅等於其中氧化較快者單獨氧化時之速度。但如用[2,6]二氯靛酚作為氫受體時,二者共同氧化時之總速度完全等於二者分別氧化時速度的和。 (四)當用氧或過量之細胞色素c作為氫受體時,琥珀酸與還原輔酶Ⅰ能彼此互相抑制對方氧化的速度。有足夠的實驗材料說明,還原輔酶Ⅰ對於琥珀酸氧化的抑制,不是由於草醯乙酸聚集的緣故。 (五)如果在反應混合物中同時含有琥珀酸脫氫酶的專一抑制劑,丙二酸,則琥珀酸對於還原輔酶Ⅰ氧化作用的抑制即被解除。 (六)根據以上的實驗結果,可以認為,還原輔酶Ⅰ及琥珀酸先通過一個共同的因子與細胞色素c作用。這個共同的因子在一般情形之下,也是這兩個酶系統的速度限制因子。應該指出在我們的實驗中,並未使用任何可能影響酶系統結構的條件,因此我們的結果是在一個比較接近於生理狀態的情形之下獲得的。 (七)應該着重指出,從本報告的結果可以看到,一個用人為的方法從複雜酶系上溶解下來的酶的性質,有時並不能代表這個酶在有組織的酶系統中的真實情况。 (八)我們相信,本報告所說明的兩酶系競爭一個共同因子的一些現象,將为研究複雜酶系之間的相互關係,提供一個新的方法。

    The purpose of this study was to find the response of the teleost's brain toward chemical stimuli.In carrying out the series of experiments, four species of teleost fishes were selected as working materials. They were Carassius auratus, Ophiocephalus argus, Monopterus javanensis and Hypophthalmichthys nobilis.The chemical agents for the experiments were selected as follows: Janus green, methylene blue, neutral red and crystal violet for staining purpose, i. e. for primary oxidation (Child' 47), in which...

    The purpose of this study was to find the response of the teleost's brain toward chemical stimuli.In carrying out the series of experiments, four species of teleost fishes were selected as working materials. They were Carassius auratus, Ophiocephalus argus, Monopterus javanensis and Hypophthalmichthys nobilis.The chemical agents for the experiments were selected as follows: Janus green, methylene blue, neutral red and crystal violet for staining purpose, i. e. for primary oxidation (Child' 47), in which the specimens were examined with the results recorded before reduction process set in; and in addition potassuim permanganate was used for complete oxidation-reduction purpose. The concentrations of the former agents in Ringer's solution and the latter in distilled water were experimentally determined, and are given in Table 1-4.In all cases of the stain experiments, the metabolic rates of the nosebrain (including only the olfactory bulbs and primitive endbrain in the present case) are higher than any other division, and that of the cerebellum, the balancing brain, comes out to be the next, being higher than all the other parts of the organ (with the exception of Carassius). The midbrain (part of the eyebrain) is less responsive than the cerebellum; and the medulla oblongata, without the facial and vagal lobes (brain centers for taste buds) and with its anterior regions (the earbrain) overshadowed largely by the cerebellum or only with little parts visible from above; i. e., the skinbrain, is, on the average, least responsive of allIn Carassius, the vagal lobes showed somewhat greater sensitivity than the cerebellum, and in Hypophthalmichthys they were less so than the facial lobes, which in turn almost matched up with the cerebellum. As a whole, it may be said that the olfactory lobes and primitive endbrain are most responsive and the midbrain and medulla oblongata least so, the cerebellum somewhat between them, while the facial and vagal lobes vary in their responses to these stains, but they fall between the endbrain and the medulla. If the records of both these lobes were removed from the curves on Carassius and Hypophthalmichthys, (Chart V (A)-(D)), these four curves would have a much closer resemblance in the general tendency of responses among themselves; i. e., the centers of greatest activities are located in the nosebrain, there is a considerable dropping in the eyebrain, while the cerebellum, the balancing brain, shows a great deal of rise in responsiveness, though it does not go so high as either the olfactory lobes or the primitive endbrain, and finally the medulla oblongata, the skinbrain, shows least responsiveness to the stains.The results of the oxidation-reduction process (Chart VI (A)-(D)) show more or less a general resemblance to those o?the stain experiments, but there are some differences, which should be noted. In the case of Carassius the primitive endbrain falls in its functional features a great deal below the olfactory lobes and is now even lower than the cerebellum, and the vagal lobes are about on the same level with the midbrain, while in the case of Monoptenis the cerebellum is the most active division of the brain and the medulla oblongata is similar to the midbrain. In general, it is reasonable to assume that the physiological gradients in the brains of Carassius and Hypophthalmichlhys are similar to each other, as they are of the same family, and those of Ophiocephalus and Monopterus are likewise, though they are of different families. In spite of some deviations these brains in both stain and oxidation-reduction experimentes show a general trend of similarity in their responses.It is concluded that the sensitivities of the brain surface to these chemicals are in direct proportion to its functional activities and in reverse proportion to their histogenetic age. Besides these factors, the polarity of the organ and the size of its division also have a significant bearings on the physiological gradient, but the latter should be considered together with the organization and developmental st

    (一)此研究限于鱼脑的背面(因由腹面观察,不能看到全脑各部)。所用四种硬骨鱼是鲫鱼、乌鱼、黄鳝与黑鲢。 (二)鱼脑背面,分为五部分:嗅球、原始端脑、中脑、小脑与延脑。鲫鱼延脑背面前部有迷叶长出,鲢鱼延脑背面前部有面叶与迷叶长出。为研究便利计,将迷叶与面叶划为另外部分,分别观察其代谢现象。 (三)染剂用以刺激鱼脑者,为简氏绿、次甲基蓝、中性红与晶紫。此外,又用过锰酸钾作完全氧化—还原实验。 (四)对于以上各剂,鱼脑反应程度最高处是嗅球,大约与嗅球相等者,是原始端脑,稍次是小脑,再次是中脑,最次是延脑。黑鲢面叶与迷叶低于小脑,高于中脑,而面叶高于迷叶(曲线图Ⅴ(D)与Ⅵ(D))。鲫鱼的迷叶,对染剂的反应,高于小脑,对氧化—还原剂的反应,低于小脑(图Ⅴ(A)与Ⅵ(A))。 整个结论是鱼脑表面,对于化学药剂的感性与其生理功用成正比例,与其组织之年龄成反比例。除此二因素外,脑的极性(polarity)、脑各部分之体积,都与生理量度有密切的关系。唯体积关系,须与以后数点共同考虑:(1)组织的构成;(2)组织发达的程度;(3)在演化过程中该组织对于脑部继续发达,及其功用所有关系的重要性(不能单看体积的大小)。鼻脑在脑前端,...

    (一)此研究限于鱼脑的背面(因由腹面观察,不能看到全脑各部)。所用四种硬骨鱼是鲫鱼、乌鱼、黄鳝与黑鲢。 (二)鱼脑背面,分为五部分:嗅球、原始端脑、中脑、小脑与延脑。鲫鱼延脑背面前部有迷叶长出,鲢鱼延脑背面前部有面叶与迷叶长出。为研究便利计,将迷叶与面叶划为另外部分,分别观察其代谢现象。 (三)染剂用以刺激鱼脑者,为简氏绿、次甲基蓝、中性红与晶紫。此外,又用过锰酸钾作完全氧化—还原实验。 (四)对于以上各剂,鱼脑反应程度最高处是嗅球,大约与嗅球相等者,是原始端脑,稍次是小脑,再次是中脑,最次是延脑。黑鲢面叶与迷叶低于小脑,高于中脑,而面叶高于迷叶(曲线图Ⅴ(D)与Ⅵ(D))。鲫鱼的迷叶,对染剂的反应,高于小脑,对氧化—还原剂的反应,低于小脑(图Ⅴ(A)与Ⅵ(A))。 整个结论是鱼脑表面,对于化学药剂的感性与其生理功用成正比例,与其组织之年龄成反比例。除此二因素外,脑的极性(polarity)、脑各部分之体积,都与生理量度有密切的关系。唯体积关系,须与以后数点共同考虑:(1)组织的构成;(2)组织发达的程度;(3)在演化过程中该组织对于脑部继续发达,及其功用所有关系的重要性(不能单看体积的大小)。鼻脑在脑前端,屡次实验,表现为最高生理量度之所在;此处之势力,支配全脑各部分。高等脊椎动物的大脑,

     
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