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reaction sites
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  反应位点
     The results showed that positive reaction sites in dose and time dependant ways were detected in the hypothalamus and pituitary, suggesting that inhibin á subunit could pass through the blood-brain barrier arriving at hypothalamus and pituitary. It provided new morphological basis for the research field of a passage mechanism of the subunit through blood-brain barrier.
     结果表明,在下丘脑与垂体存在抑制素α亚基单克隆抗体的特异性阳性反应位点,并存在剂量与时间上的依赖关系,说明抑制素α亚基可以通过血脑屏障到达下丘脑和垂体,为探讨抑制素α亚基在血脑屏障的转运机制提供了形态学上的依据。
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  相互作用部位
     It has been shown that, though both SiO_2 and TiO_2 accelerate cell phoresis and enhance Z-potential and the surface charge, they significantly differ in the extent of influence, dynamic process, the effects on alluminium citrate and the reaction sites on the cell surface.
     结果表明,虽然SiO_2和TiO_2均可使细胞泳动速度加快,ζ-电位和表面电荷升高,但是两者在作用程度、动力学过程、柠檬酸铝的影响及其与细胞表面的相互作用部位等方面均有明显差异。
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  “reaction sites”译为未确定词的双语例句
     Inflammation in both the epidermis and dermis of the reaction sites reached the peak at 48 h to 72 h,mainly with CD45RO + T cells and CD68 + macrophages infiltration around epidermis or superficial dermal vessels.
     48~ 72h时表皮和真皮炎症达高峰 ,主要是CD45RO+ T细胞和CD68+ 巨噬细胞分布于炎症表皮及真皮血管周围。
短句来源
     It was found that different reaction sites on catalyst possessed different catalytic activity among which those edge reaction sites possessed higher activity.
     结果表明,催化剂不同反应位上的催化活性不同,边位的催化活性较高。
短句来源
     CNDO/ 2 calculations showed that the π-electron polarizability (superdelocalizability) of the reaction sites was greater than that of the carbon-carbon double bond.
     CNDO/2计算指出,反应位置的π电子可极化率(超离位度)比碳-碳双键大。
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     The results of the photoelectrochemical performance showed that an appropriate amoun t of CoOx doping on photocatalyst could produce phtocatalytic reaction sites — CoOx-TiO2 complexing compounds on surface of TiO2, and enhance the photocurrent response.
     光电化学性能评价结果表明,适当掺杂CoOx和适当温度下焙烧能在催化剂表面形成较多的析氢活性物种———含钴复合物,能有效增强催化剂光电流响应强度,并使得析氢光还原电位向有利于析氢方向位移。
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     The mechanism of photocatalytic oxidation of organic pollutants in water has been thoroughly disscussed from carrier trapping, oxidizing species, the reaction sites and the adsorption effects, the photolysis in the photocatalytic oxidation process.
     从载流子的俘获、氧化物种、反应发生的位置和吸附作用以及光催化氧化过程中的光解作用等方面,探讨了光催化氧化水中有机污染物的机理.
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     Copper ions are the active sites for the reaction.
     铜离子是反应的活性中心 .
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     The Reaction Behavior and Active Sites of Oxychlorination Catalyst
     氧氯化催化剂的吸附和反应性能及其活性位置——Ⅱ.氧氯化催化剂的反应性能与活性位置
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     the reaction temperature
     温度应控制在300℃~ 310℃之间;
短句来源
     The electrode reaction is(?)
     ,电极反应是由醌型还原为氢醌型。
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     nsted acid sites.
     nsted 酸性位相互作用。
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  reaction sites
Cupric ions on Ti-PILC were active reaction sites for the present reaction system.
      
A kinetic model study was attempted to elucidate the specific reaction sites of the tested compounds and the major contribution of destruction route (OH ? reaction or pyrolysis reaction) depending on the various conditions.
      
In this model, the reaction-rate-limiting step is assumed to be transport of a gaseous intermediate by pore diffusion between reaction sites on the surfaces of the reactant particles.
      
The model is based on the new concept that there are two independent reaction sites in a slag bath: one for fast oxidation and the other for slow reduction.
      
Under conditions of temperature and composition which produce reaction rates of commercial interest, the conversion is limited by product mass transport away from the reaction sites.
      
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In relation to the graft copolymerization of cellulose using Ce4+ as catalyst, the mechanism of cellulose oxidation and the reaction sites on the cellulose macromolecular chain in Ce4+-H2O-cellulose system were studied.From the experimental data concerning the rate of reduction of Ce4+ to Ce3+ in aqueous solution, the photosensitive character of this system has been confirmed.From the rates of oxidation of cellulose and its related model compounds, such as hydrocellulose, cellobiose, dialdehydecellulose,...

In relation to the graft copolymerization of cellulose using Ce4+ as catalyst, the mechanism of cellulose oxidation and the reaction sites on the cellulose macromolecular chain in Ce4+-H2O-cellulose system were studied.From the experimental data concerning the rate of reduction of Ce4+ to Ce3+ in aqueous solution, the photosensitive character of this system has been confirmed.From the rates of oxidation of cellulose and its related model compounds, such as hydrocellulose, cellobiose, dialdehydecellulose, glucose and methylglucoside, as determined in eerie salt solution, the kinetics of cellulose oxidation may be represented by the following equation:where [Ⅰ]0, [Ⅱ]0 and [Ⅲ]0 are the initial concentrations of the functional groups of type Ⅰ, Ⅱ2 and Ⅲ, and kⅠ, kⅡ and kⅢ are their reaction rate constants respectively.By determining and comparing the rate constants of the same type but of different cellulose model compounds, it was found that the values of k for the same functional group are approximately equal irrespective of the model compounds to which the particular type of functional group is attached. It was also confirmed that there are at least three oxidation sites on a cellulose macromolecular chain. The sites of greater and medium reactivity are the aldehyde group and 5,6-glycol unit of the terminal anhydroglucose unit respectively. The least reactive site is the hydroxyl groups attached to the third position of the rest of anhydroglucose rings. Though the value of km is very small, nevertheless, the reaction of third position should not be neglected for the number of such hydroxyl groups is great.When cellulose is oxidized by eerie salt, it was found that one mole of terminal aldehyde group or 5,6-glycol unit consumes two moles of eerie salt and was finally converted into new aldehyde group. Cellulose free radical formed as an intermediate product initiates the graft copolymerization. Hence, it may be assumed that the copolymer of cellulose obtained by Ce4+ initiation is possibly a graft-block complex copolymer.

从高铈盐水溶液分解动力学角度进一步确定了反应体系的光敏性质。 从水解纤维素、纤素二糖、二醛基纤维素、葡萄糖、葡萄糖甲甙等纤维素模型化合物在高铈盐溶液中的氧化动力学,确定了作为含有多种官能团的高聚物纤维素的氧化动力学方程式是: -(d[Ce~(4+)]/dt)=(k_Ⅰ[Ⅰ]_0+k_Ⅱ[Ⅱ]_0+k_Ⅲ[Ⅲ]_0+……)[Ce~(4+)]其中,[Ⅰ]_0、[Ⅱ]_0和[Ⅲ]_0分别为纤维素中第1、2和3官能团的初始浓度。k_Ⅰ、k_Ⅱ和k_Ⅲ分别为它们的反应速率常数。 不同模型化合物中相同官能团速率常数的对比,确定了速率常数的归属。k_Ⅰ、k_Ⅱ分别为巨分子端基环上的潜醛基和 5、6-乙二醇单元的反应速率常数。证明在纤维素巨分子中至少有三个氧化反应部位。 纤维素巨分子经高铈盐氧化时,每个潜醛基或5、6-乙二醇单元各消耗二个高铈离子,最后都转变为醛基。在消耗一个高铈离子时,可以生成中间络合物——巨分子自由基。自由基位于末端基环的第2位和第5位碳原子上。 第三反应部位位于中间基环上,其反应速率常数虽小,但由于含量很多,故其反应速率不容忽视。第三反应部位的精确位置现尚无法肯定。 用高铈引发所得共聚物主链没有明显的裂...

从高铈盐水溶液分解动力学角度进一步确定了反应体系的光敏性质。 从水解纤维素、纤素二糖、二醛基纤维素、葡萄糖、葡萄糖甲甙等纤维素模型化合物在高铈盐溶液中的氧化动力学,确定了作为含有多种官能团的高聚物纤维素的氧化动力学方程式是: -(d[Ce~(4+)]/dt)=(k_Ⅰ[Ⅰ]_0+k_Ⅱ[Ⅱ]_0+k_Ⅲ[Ⅲ]_0+……)[Ce~(4+)]其中,[Ⅰ]_0、[Ⅱ]_0和[Ⅲ]_0分别为纤维素中第1、2和3官能团的初始浓度。k_Ⅰ、k_Ⅱ和k_Ⅲ分别为它们的反应速率常数。 不同模型化合物中相同官能团速率常数的对比,确定了速率常数的归属。k_Ⅰ、k_Ⅱ分别为巨分子端基环上的潜醛基和 5、6-乙二醇单元的反应速率常数。证明在纤维素巨分子中至少有三个氧化反应部位。 纤维素巨分子经高铈盐氧化时,每个潜醛基或5、6-乙二醇单元各消耗二个高铈离子,最后都转变为醛基。在消耗一个高铈离子时,可以生成中间络合物——巨分子自由基。自由基位于末端基环的第2位和第5位碳原子上。 第三反应部位位于中间基环上,其反应速率常数虽小,但由于含量很多,故其反应速率不容忽视。第三反应部位的精确位置现尚无法肯定。 用高铈引发所得共聚物主链没有明显的裂解,自由基的可能位置表明它可能是接枝-嵌段复合共聚物。

Through the study of the copolymerization of AN and MMA in bulk and in solution of N,N-ditnethylformamide, dioxane, benzene, cyclohexane, methanol and water, the following results have been obtained:1. In solution precipitation copolymerization, it has been proved that solvents do influence the monomer reactivity ratios for certain monomer pairs.2. The copolymer composition curves and the monomer reactivity ratios of such copolymerization system in different solvents were obtained. It has been proved that the...

Through the study of the copolymerization of AN and MMA in bulk and in solution of N,N-ditnethylformamide, dioxane, benzene, cyclohexane, methanol and water, the following results have been obtained:1. In solution precipitation copolymerization, it has been proved that solvents do influence the monomer reactivity ratios for certain monomer pairs.2. The copolymer composition curves and the monomer reactivity ratios of such copolymerization system in different solvents were obtained. It has been proved that the result of the copolymerization of AN and MMA in water obtained by Sadao Yuguchi[6] was not correct.3. According to the above experimental results, we incline to believe that the change of the copolymer composition in precipitation copolymerization seems to be due to the difference between the effective composition of the reacting monomers in the reaction site and the average composition of the monomer in the system. The effective composition of the reacting monomers then would be reasonably assumed to relate both with the difference between the polarities of the two monomers and with the difference between the polarities of the liquid medium and the solid copolymer.4. In precipitation copolymerization, the concentration of monomer also influences the copolymer composition in certain cases.

通过AN-MMA在本体以及在N,N-二甲基甲酰胺,二氧六圜、苯、环己烷、甲醇及水等溶剂中进行溶液共聚合的研究,得到以下结论: 1.证实了介质对一定共聚体系的均相溶液沉淀共聚合的竞聚率是有影响的。 2.提供了本共聚体系在多种介质中进行溶液共聚合时的竞聚率数据及有关的共聚物组成曲线。同时在水溶液共聚合中,证明柚口贞夫所报导的实验数据与事实不符。 3.根据实验结果,作者初步认为,在均相溶液沉淀共聚合反应中,共聚物组成所以发生变化可能是由于反应地点有效配比与单体投料配比出现差距所导致。而有效配比与两单体极性的差别以及介质与共聚物的极性大小有关。 4.在均相溶液沉淀共聚合中,尤其是采用非极性有机介质时,单体的绝对浓度对共聚物组成也有一定的影响。

Decaborane was shown to be a new hydroboration agent.Thus by reacting withdecaborane in tetrahydrofuran followed by alkaline hydrogen peroxide oxidation,camphene was converted into endo-oamphenilanol and exo-camphenaldehyde;Δ~2-chole-stene was converted into a mixture of 3α-,2α-and 3β-cholestanol and Δ~5-cholestene intoa mixture of 6α-cholestanol and cholestan-6-one.Cholestan-3-one was reduced bydecaborane to give a mixture of 3β-and 3α-cholestanol.These results indicated thathydroboration with decaborane proceeded...

Decaborane was shown to be a new hydroboration agent.Thus by reacting withdecaborane in tetrahydrofuran followed by alkaline hydrogen peroxide oxidation,camphene was converted into endo-oamphenilanol and exo-camphenaldehyde;Δ~2-chole-stene was converted into a mixture of 3α-,2α-and 3β-cholestanol and Δ~5-cholestene intoa mixture of 6α-cholestanol and cholestan-6-one.Cholestan-3-one was reduced bydecaborane to give a mixture of 3β-and 3α-cholestanol.These results indicated thathydroboration with decaborane proceeded by cis-addition with the attacking reagententering the less hindered side of the double bond,was analogous to the ordinary hydro-boration with diborane.In the hydroboration of Δ~5-cholestene,the reactivity of deca-borane was remarkably lower than that of diborane.It is possible that the difference wasdue to the greater steric requirement for the approaching of decaborane moleculetoward the reaction site.The molar ratios required for the reaction of camphene,Δ~2-cholestene and 3-chole-stanone with decaborane were 2. 3 to 2. 5:1; 1. 6:1 and 6 to 7:1 respectively.

本文指出癸硼氢可以作为一种新的硼氢化试剂;它与烯烃在四氢呋喃中反应,然后经碱性过氧化氢氧化水解,可获得正常的硼氢化产物.即自莰烯可获得内异莰醇和外异茨醛,自Δ~2-胆甾烯获得3α-,2α-和3β-胆甾醇的混合物,自Δ~5-胆甾烯获得6α-胆甾醇和6α-胆甾酮;癸硼氢也可将3-胆甾酮还原为3β和3α-胆甾醇的混合物.据反应进行情况以及产品的结构,证明癸硼氢的硼氢化反应亦是通过顺式加成的机制,并且从双键位阻较小的一面进行反应.在Δ~5-胆甾烯的硼氢化反应中,癸硼氢的反应性较乙硼氢差,空间效应可能是这种差别的原因之一.莰烯、Δ~2-胆甾烯及3-胆甾酮与癸硼氢的反应的分子比分别为2. 3至2. 5∶1;1. 5∶1和6至7∶1.

 
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