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化学反应性
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  chemical reactivity
     Chemical Reactivity and Polymerization of C_(60)
     C_(60)的化学反应性和高分子化
短句来源
     Interfacial Chemical Reactivity of PS/MWNT Composites
     PS/MWNT复合材料界面上的化学反应性
短句来源
     For I=0,the inhibition activity of bezylidenmalononitrile derivatives is determined by its chemical reactivity,While for I=1,it is determined by its electrostatic character.
     I=0时,亚苄基丙二腈类衍生物的抑制作用由其化学反应性决定; I=1时其抑制作用由其静电性决定.
短句来源
     In addition,the chemical reactivity、 resin mechanics properties and the influence of polymer ether imide (PEI) toughening 5406 resin were discussed in the thesis .
     本文还对5406树脂体系的化学反应性、树脂浇注体力学性能以及聚醚酰亚胺(PEI)增韧改性5406双马树脂进行了研究。
短句来源
     the fluorine content of the apatite directly affects the characters of the ores,after the calcination of the ores (including the defluoride phosphate fertilizer production) is actually simulating the process of the reduction of fluorine of ores in nature. Because of the calcination makes citrate soluable P2O5 and chemical reactivity decreased.
     由于磷矿物中的氟含量直接影响了磷矿物的各种性质,而磷矿煅烧(包括脱氟磷肥生产)过程实质上是模拟磷矿在自然界的变质过程,使P_2O_5枸溶率和化学反应性下降。
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  chemical responsivity
     It has many advantages, for example, it costslow and is able to bear high temperature,has fine chemical responsivity, little fixed carbon, low ash contentment, etc.
     具有球团生产成本低、耐高温、化学反应性好、固定碳降低量小、灰分低等优点.
短句来源
  “化学反应性”译为未确定词的双语例句
     SiO_2, Al_2O_3 areinvestigated.
     SiO_2、Al_2O_3的化学反应性
短句来源
     Structure and Reactivity of Nitrile Grouping Aliphatic Acids
     腈基取代脂肪族一元酸的电子结构与化学反应性
短句来源
     Sodium α,α-dichlorotrifluoroethane sulfinatereacted with bromine in water at 25℃ to form α,α-dichlorotrifluoroethanesulfonylbromide which was thermally less stable than but similar in reactivity to perfluoro-alkanesulfonyl bromide.
     α,α-二氯三氟乙基亚磺酸钠与溴水在20—25℃反应,得α,α-二氯三氟乙基磺酰溴,其化学反应性与全氟烷基磺酰溴类似,但稳定性较差.
短句来源
     Different content of metal oxides on inerts have been prepared as oxygen carriers by different methods. The performances of them have been systematically summarized,such as reactivity in both reduction by fuel and oxidation by oxygen,transport capacity for oxygen,physical properties,chemical life,operating temperature,and the resistance to carbon deposition. Summing-up that NiO/NiAl_2O_4,Fe_2O_3/Al_2O_3,and CoO-NiO/YSZ have good performances.
     系统总结了以不同的金属氧化物和惰性载体作为原料,通过二者不同的混合比例,不同的制备工艺制备的氧载体的性能,包括化学反应性、载氧能力、物理性能、循环寿命、反应温度范围和抗碳沉积能力等,认为氧载体NiO/NiAl2O4,Fe2O3/Al2O3和CoO-NiO/YSZ综合性能优良,可用于化学链燃烧过程.
短句来源
     THE CHEMICAL INTERACTION OF YBCO HIGH-Tc SUPERCONDUCTOR WITH OXIDE SUBSTRATE MATERIALS
     YBCO高温超导体与氧化物衬底的化学反应性
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  chemical reactivity
More generally, it is concluded that proteins and other macromolecules may undergo structural changes (that may affect their chemical reactivity) following optical excitation of an appropriately (covalently or non-covalently) bound chromophore.
      
Deficiencies in C4A and C4B isotypes of human complement revealed by isoelectrofocusing and chemical reactivity of activated for
      
It was found that photolon and protoporphyrin IX entrapped in sol-gel preserve their chemical reactivity and have contact with the external environment.
      
Valence bond theoretical study for chemical reactivity
      
The symmetry-adaptation of the valence bond structure can directly predict the chemical reactivity by a symmetry analysis of the VB structures of reactants and products without carrying out explicitly theoretical calculations.
      
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The antibiotic properties of a series of hydroquinones were examined in an effort to study the quantitative structure activity relationship with the application of Topliss, Hansch and Free-Wilson methods.It seems likely that the pharmacological activity of the substituted hydroquinones. is realized by the charge transfer complex which is formed by the transfer of electrons from receptor site to the specific hydroquinone. In Hansch analysis, the parameter LEMO was calculated by molecular orbital technique and...

The antibiotic properties of a series of hydroquinones were examined in an effort to study the quantitative structure activity relationship with the application of Topliss, Hansch and Free-Wilson methods.It seems likely that the pharmacological activity of the substituted hydroquinones. is realized by the charge transfer complex which is formed by the transfer of electrons from receptor site to the specific hydroquinone. In Hansch analysis, the parameter LEMO was calculated by molecular orbital technique and a better correlation was found in combination with othet parameters.The experimental values of lg(1/C) agree fairly with the values calculated by both Hansch and Free-Wilson equations.

本文用Topliss,Free-Wilson和Hansch方法对氢醌类化合物的抗菌活性进行了QSAR研究。取代氢醌的抗菌活性可能是通过药物与受体间的电子转移所生成的电荷转移复合物而实现的。在Hansch分析中,应用了表征药物与受体间化学反应性的量子化学参数LEMO。三种方法配合取得了一致的良好结果。

The near ultraviolet CD spectra of PEP carboxylase from sorghum leaves were studied in the presence of various ligands, The free enzyme shows a spectrum with a negative CD peak at 275 nm and two shoulder at 268nm and 295nm. The spectrum of enzyme-PEP complex indicates Changes in the asymmetric microenvironments of Phe and Tyr residues. Mg~(++) binding to the enzyme giyes rise to changes in the CD absorption of Tyr residues in the enzyme moleeuies (see Fig. 1). Combined addition of PEP and Mg~(++) to the enzyme...

The near ultraviolet CD spectra of PEP carboxylase from sorghum leaves were studied in the presence of various ligands, The free enzyme shows a spectrum with a negative CD peak at 275 nm and two shoulder at 268nm and 295nm. The spectrum of enzyme-PEP complex indicates Changes in the asymmetric microenvironments of Phe and Tyr residues. Mg~(++) binding to the enzyme giyes rise to changes in the CD absorption of Tyr residues in the enzyme moleeuies (see Fig. 1). Combined addition of PEP and Mg~(++) to the enzyme solution produces profound effect on the enzyme CD spectrum. Compared with the CD spectrum of free enzyme, the presence of PEP-Mg~(++) complex causes a blue shift in the negative CD peak (from 275nm to 272nm) and appearance of a new shoulder at 285nm (see Fig.2).Effectors G6P and Gly cause very different changes in the spectrum of the enzyme (see Fig.3). Gly exerts effect on the enzyme CD spectrum mainly in the region of Tyr absorption, while the binding of G6P to the enzyme gives rise to vigorous changes in the microenvironments of the three aromatic residues.All these results proved that the molecule of PEP carboxylase is highly flexible and that multiple conformational states of the enzyme can be induced by interaction with substrate, Mg~(++), effectors, etc. The flexibility could explain the obvious. differences in catalytic activity, regulatory properties and stability of the enzyme in the presence of various ligands.

用近紫外CD光谱技术追踪了PEP羧化酶与各种配基的相互作用。底物PEP、必需金属离子Mg~(++)、PEP-Mg~(++)以及效应剂G6P、Gly、G6P-Gly,均可引起高粱叶片PEP羧化酶近紫外CD光谱各不相同的变化。这表明高粱叶片PEP羧化酶分子构象有较大的灵活性,不同的配基与酶相互作用可引起酶分子不同的构象变化,因而使酶分子表现出催化功能、调节特性、必需氨基酸残基的化学反应性以及稳定性诸方面的差异。

Perfluoroalkanesulfonyl bromides reacted with vinyl bromide,vinyl acetate andtrimethyl vinyl silane to give the corresponding adducts with the evolution of SO_2.However,reaction with trimethyl silyl enol ether followed by hydrolysis gave only thecorresponding α-bromo ketones and perfluoroalkanesulfinic acids.Perfluoroalkanesul-fonyl chloride reacted with trimethylsilyl ether of pinacolone on UV irradiation to givethe corresponding α-perfluoroalkyl derivative of pinacolone.Under mild condition,perfluoroalkanesulfonyl...

Perfluoroalkanesulfonyl bromides reacted with vinyl bromide,vinyl acetate andtrimethyl vinyl silane to give the corresponding adducts with the evolution of SO_2.However,reaction with trimethyl silyl enol ether followed by hydrolysis gave only thecorresponding α-bromo ketones and perfluoroalkanesulfinic acids.Perfluoroalkanesul-fonyl chloride reacted with trimethylsilyl ether of pinacolone on UV irradiation to givethe corresponding α-perfluoroalkyl derivative of pinacolone.Under mild condition,perfluoroalkanesulfonyl bromide also brominated phenol and anisole to give thecorresponding p-bromo derivatives.Sodium α,α-dichlorotrifluoroethane sulfinatereacted with bromine in water at 25℃ to form α,α-dichlorotrifluoroethanesulfonylbromide which was thermally less stable than but similar in reactivity to perfluoro-alkanesulfonyl bromide.

全氟烷基磺酰溴与杂原子取代烯烃,如溴乙烯,乙酸乙烯酯,三甲基硅乙烯加成,得相应的加成物,与烯醇硅醚反应,水解后得到α位溴代酮和全氟烷基亚磺酸.全氟磺酰氯与1-三甲基硅氧基-1-叔丁基乙烯在紫外光照下反应,生成α位全氟烷基化的酮.全氟烷基磺酰溴溴化苯酚和甲氧基苯,得到对位溴化产物.α,α-二氯三氟乙基亚磺酸钠与溴水在20—25℃反应,得α,α-二氯三氟乙基磺酰溴,其化学反应性与全氟烷基磺酰溴类似,但稳定性较差.

 
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