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activity     
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  活性
    Photocatalytic Oxidation and Reduction Activity of Nano-Perovskite ABO_3 Oxides
    纳米钙钛矿型ABO_3复合氧化物的光催化氧化还原活性
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    Synthesis, Structure and Antimicrobial Activity Study on New Complexes Derived from Polyamine
    新型有机多胺配合物的合成、结构及抗微生物活性研究
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    Reaction Activity and Stabilizing of the P-quinodimethane Intermediates and Their Application
    醌式中间体的反应活性和稳定化及其应用
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    Preparation, Characterization and Electrochemical Properties of Catalytic Materials of High Activity Tungsten Carbide
    高活性碳化钨催化材料的制备、表征及电化学性能研究
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    Research for the Surface Structure of Pt/C Catalyst and Its Activity to Hydrogen-water Isotopic Exchange Reaction
    Pt/C的表面结构及其对氢一水同位素交换的催化活性研究
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  活力
    Effect of Potential Treatment on Nitrogenase Activity of Azotobacter vinelandii Whole Cell
    电位处理对棕色固氮菌整体细胞固氮活力的影响
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    Effect of Organic Solvents on the Molecular Folding and the Enzyme Activity of Fruit Bromelain
    果菠萝蛋白酶在有机溶剂微扰时的分子折叠与活力变化的研究
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    Determination of Urease Activity in Soybeen by Glass Electrode Potentiometry
    大豆中脲酶活力的玻璃电极法测定
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    The Effects of Some Chemical Modifier on the Enzymatic activity of PLA_2
    若干化学修饰剂对PLA_2酶活力的影响
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    A STUDY ON THE INFLUENCE OF  ̄(60)Co γ-IRRADIATION ON THE ACTIVITY OF PANCREATINUM
    ~(60)Coγ辐照对胰酶活力影响的研究
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  活度
    Isopiestic Determination of the Osmotic and Activity Coefficients and Its Application in the Sodium Aluminate Solution System
    渗透系数和活度系数的等压法测定及其在铝酸钠溶液体系中的应用
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    ACTIVITY COEFFICIENTS FROM GAS-LIQUID CHROMATOGRAPHY
    气液色譜法測活度系数
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    CALCULATION OF THE ACTIVITY COEFFICIENT OF TWO COMPONENT SYSTEM (TBP, DBP AND SOLVENT) BY THE CLUSTER EXPANSION METHOD
    用统计物理团展开理论计算TBP、DBP与溶剂二元体系的活度系数
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    ACTIVITY COEFFICIENTS OF SOME MONOMER- MONOMER AND MONOMER - DIMER
    某些单体-单体、单体-二聚体体系的活度系数
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    An Investigation into Individual Ionic Activity Coefficient in Electrolyte Solution (I) The Linear Relation of Individual Ionic Activity Coefficient in Aqueous Solution with a Single Electrolyte
    电解质溶液中单个离子活度系数的研究(I) 单一电解质水溶液中单个离子活度的线性规律
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  酶活性
    Kinetic Studies on the Protection of Enzyme Activity by Substrate During Irreversible Modification
    酶活性不可逆改变的底物保护动力学
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    Application of Functional-Link Net: Na~+-K-ATPase Activity with Structure of Substituted Aromatic Compounds
    QSAR结合人工神经网络方法研究取代芳烃分子结构与Na-K-ATP酶活性
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    Generation of superoxide anion in reverse microemulsion ─methodical study on measurement of SOD activity
    W/O型微乳液中超氧化物阴离子的产生──微环境中SOD酶活性测定方法研究
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    Optical density and enzyme activity in reverse micelles
    反胶束体系的光密度与酶活性测定
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    Study on Imitated Enzyme Activity of New Chiral Amio Acid Tailed Porphyrin Copper(II) Complexes
    新型手性氨基酸尾式卟啉铜(II)配合物的仿酶活性
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  activity
Synthesis and Cytotoxic Activity of 6-(Substituted-Phenyl)Amino-5,8-Quinazolinediones
      
Design, Synthesis and Growth Inhibition Activity of Bis-Epoxyethyl Derivatives of Stallimycin Modified on the Amidino Moiety
      
BIOLOGICAL ACTIVITY AND NEW TRENDS IN THE CHEMISTRY OF ISOQUINOLINE ALKALOIDS
      
Statistically significant correlation (r>amp;gt;0.905) was obtained between the physicochemical parameters and biological activity.
      
These studies may be useful in designing molecules with better cyclooxygenase-2 inhibitory activity.
      
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The main difficulty of the one-electron theory of optical activity lies in the calculation of the so-called vicinal actions. This may be overcome, as suggested in the present investiga- tion by assuming that the vicinal actions are due to the interactions of various chemical bonds in the molecule with the chromophoric electron. For the calculation of these interactions the charge distribution of a single covalent bond is assumed to consist of two nuclei, each of unit positive charge, separated by the bond...

The main difficulty of the one-electron theory of optical activity lies in the calculation of the so-called vicinal actions. This may be overcome, as suggested in the present investiga- tion by assuming that the vicinal actions are due to the interactions of various chemical bonds in the molecule with the chromophoric electron. For the calculation of these interactions the charge distribution of a single covalent bond is assumed to consist of two nuclei, each of unit positive charge, separated by the bond distance and two electrons with opposite spins and a spherically symmetrical orbital eigenfunction represented by (?) where r is the distance measured from a certain point on the bond axis and near the center of the bond. The location of this point is so determined that the model will give the proper dipole moment of the bond. The exponent α, which determines the extent of diffusivity of the electron cloud, is obtained by an approximate variational treatment. The quadruple moment of this model, calculated for the C-H bond, agrees very well with that estimated by Lassettre and Dean from a study of the potential barrier hindering the internal rotation of the ethane molecule. To test the theory and also to illustrate the procedure which is followed in calculating optical rotations using the new model of vicinal actions, the optical rotations of several methyl derivatives of cyclopentanone have been calculated and the following conclusions have been reached: (1) The proposed model gives rise to optical rotations in agreement with the observed values. (2) The effect of the internal rotation of the methyl group on the molecular rotation [M]_D of 3-methylcyclopentanone is large, [M]_D being +44° and -130° for the cis- trans-conformations, respectively. (3) The observed [M]_D may be regarded as composed of two parts, namely, the contribution from the multipole terms and that from the orbital overlapping. The latter corresponds to the "incomplete screening of atomic nuclei", and has been regarded as the most important vicinal action in earlier calculations. In the present work, it is shown, however, that this effect contributes only a few percent of the total [M]_D, unless the perturbing group is very near to the chromophoric group as it is in the case of 2-methyl- cyclopentanone. The failure of the previous calculations is, therefore, due mainly to the omission of the multipole (especially the quadrupole) terms. (4) The absolute configuration of 3-methylcyclopentanone, indicated by the present calculation, is the opposite of the one suggested by Eyring, since he based on the overlapping contribution alone, which bears a sign opposite to that of the total [M]_D (5) That the observed [M]_D of 2,4,5,5-tetramethylcyclopentanone is considerably smaller than that of 2,4-dimethylcyclopentanone may be due to one or both of the following possibilities: (a) that the conformation of the 2- and 4-methyl groups slightly deviates from the trans-position in the tetra-methyl compound, due to the presence of the two additional methyl groups; (b) that the two additional methyl groups in 5,5-positions are not exactly symmetrical with respect to the ring so that they make contributions to [M]_D.

本文在量子力學的單電子旋光理論的鄰近作用問題上,作了如下的貢獻: 1.指出旋光度應由分子中各化學鍵,而不是分子中各原子(如像前人所假定的)對於生色團電子的微擾作用來計算,兩者的主要不同點在於是否考慮鍵的多極矩。 2.建議在旋光度的計算中,共價單鍵可以看作是由兩個處於鍵端的正電荷和一個以單中心狀態函數,表示出來的電子雲所組成。根據這個假定計算了環戊酮的甲基衍生物的旋光度,其結果與實驗值甚爲一致(詳見結果討論)。 3.計算結果證明甲基的內旋轉對於旋光度的影響很大,例如順式和反式構型的3-甲基環戊酮的旋光度,應分別為+44°和-30°。 4.指定了3-甲基環戊酮的絕對構型,其結果Eyring所指定者相反。

By means of Friedel-Crafts reaction, the following compounds were prepared from 4-methyl- imidazolone-2 and four different ω-carbethoxy acyl halides: 4-methyl-5-(δ-carbethoxy-γ-methyl- butyryl)-imidazolone-2, 4-methyl-5-(δ-carbethoxy-γ, γ-dimethylbutyryl)-imidazolone-2, 4-methyl- 5-(ω-carbethoxy-n-nonanoyl)-imidflzolone-2, and 4-methyl-5-(ω-carbethoxy-n-heptadecanoyl)- imidazolone-2. With PtO_2 as catalyst, they were readily reduced to the four corresponding imidazolidone compounds. These compounds were hydrolyzed...

By means of Friedel-Crafts reaction, the following compounds were prepared from 4-methyl- imidazolone-2 and four different ω-carbethoxy acyl halides: 4-methyl-5-(δ-carbethoxy-γ-methyl- butyryl)-imidazolone-2, 4-methyl-5-(δ-carbethoxy-γ, γ-dimethylbutyryl)-imidazolone-2, 4-methyl- 5-(ω-carbethoxy-n-nonanoyl)-imidflzolone-2, and 4-methyl-5-(ω-carbethoxy-n-heptadecanoyl)- imidazolone-2. With PtO_2 as catalyst, they were readily reduced to the four corresponding imidazolidone compounds. These compounds were hydrolyzed with 1 N NaOH and then followed by acidification to give the following acids: 4-methyl-5-(δ-carboxy-y-methylbutyl)- imidazolidone-2, 4-methyl-5-(δ-carboxy-γ, γ-dimethylbutyl)-imidazolidone-2, 4-methyl-5-(ω-car-boxy-n-nonanyl)- imidazolidone-2, and 4-methyl-5-(ω-carboxy-n-heptadecanyl)-imidazolidone-2. Microbiological tests indicated that the first three acids are good anti-biotins towards lactobacillus casei and saccharomyces cerevisiae strain No. 139. Due to its extreme insolubility in water, the last compound has not yet been tested for its microbiological activity.

(1)利用Friedel-Crafts反應,由4-甲基-2-氧代-二氫化咪唑及四個不同的醯氯羧酸酯,得到下列四個化合物:4-甲基-5-(δ-乙氧羰基-γ-甲基丁醯)-2-氧代-二氫化咪唑,4-甲基-5-(δ-乙氧羰基-γ,γ-二甲基丁醯)-2-氧代-二氫化咪唑,4-甲基-5-(ω-乙氧羰基-正壬醯)-2-氧代-二氫化咪唑及4-甲基-5-(ω-乙氧羰基-正十七醯)-2-氧代-二氫化咪唑。 (2)用Cr_(2)O_3精製過的乙酸爲溶劑,PtO_2爲觸媒,這四個4-甲基-2-氧代-二氫化咪唑的衍生物,很順利的吸收相當於3分子的氫,還原為相對應的4-甲基-2-氧代-四氫化咪唑的衍生物,水解後得到下列四個酸:4-甲基-5-(δ-羧基-γ-甲基丁基)-2-氧代-四氫化咪唑,4-甲基-5-(δ-羧基-γ,γ-二甲基丁基)-2-氧代-四氫化咪唑,4-甲基-5-(ω-羧基-正壬基)-2-氧代-四氫化咪唑及4-甲基-5-(ω-羧基-正十七基)-2-氧代-四氫化咪唑。前三者已作過初步的微生物效應試驗,對於lactobacillus casei及saccharomyces cerevisiae都有顯著的反促生素效應。第四個化合物因為...

(1)利用Friedel-Crafts反應,由4-甲基-2-氧代-二氫化咪唑及四個不同的醯氯羧酸酯,得到下列四個化合物:4-甲基-5-(δ-乙氧羰基-γ-甲基丁醯)-2-氧代-二氫化咪唑,4-甲基-5-(δ-乙氧羰基-γ,γ-二甲基丁醯)-2-氧代-二氫化咪唑,4-甲基-5-(ω-乙氧羰基-正壬醯)-2-氧代-二氫化咪唑及4-甲基-5-(ω-乙氧羰基-正十七醯)-2-氧代-二氫化咪唑。 (2)用Cr_(2)O_3精製過的乙酸爲溶劑,PtO_2爲觸媒,這四個4-甲基-2-氧代-二氫化咪唑的衍生物,很順利的吸收相當於3分子的氫,還原為相對應的4-甲基-2-氧代-四氫化咪唑的衍生物,水解後得到下列四個酸:4-甲基-5-(δ-羧基-γ-甲基丁基)-2-氧代-四氫化咪唑,4-甲基-5-(δ-羧基-γ,γ-二甲基丁基)-2-氧代-四氫化咪唑,4-甲基-5-(ω-羧基-正壬基)-2-氧代-四氫化咪唑及4-甲基-5-(ω-羧基-正十七基)-2-氧代-四氫化咪唑。前三者已作過初步的微生物效應試驗,對於lactobacillus casei及saccharomyces cerevisiae都有顯著的反促生素效應。第四個化合物因為在水中溶度太低,故尚未能作它的微生物效應試驗。

In this paper,the activity coefficient of aluminum in liquid iron with reference to pureliquid aluminum as the standard state is calculated from existing thermal and distribution datawith certain assumptions.First,the silver-lead equilibrium diagram is used to obtain the activitycoefficient of silver in liquid lead.Next,the data of Wright and of Lorentz and Erbe on the dis-tribution of silver between liquid lead and aluminum are combined with the foregoing toobtain the activity coefficient of silver...

In this paper,the activity coefficient of aluminum in liquid iron with reference to pureliquid aluminum as the standard state is calculated from existing thermal and distribution datawith certain assumptions.First,the silver-lead equilibrium diagram is used to obtain the activitycoefficient of silver in liquid lead.Next,the data of Wright and of Lorentz and Erbe on the dis-tribution of silver between liquid lead and aluminum are combined with the foregoing toobtain the activity coefficient of silver in liquid aluminum and therefore aluminum in liquidsilver.Chipman's data on the distribution of aluminum between liquid iron and silver arethen utilized to obtain the activity coefficient of aluminum in liquid iron.Finally,the aluminumdeoxidation constant is calculated and compared with the experimental value obtained by Gokcenand Chipman.

铅-铝与铁-银二系统的液态溶解度很小,熔化时分为二层,故可测定银在铅与铝间及铝在铁与银间的分配比。根据文献中已有的分配数据,铅-银相及有关热化学数据,作者等计算了铅-银,银-铝及铁-铝等液态二元系统中的活度。最后作者等算出了铝脱氧反应的平衡常数,与 Gokcen & Chipman 的实验数据大致相符,惟温度系数尚不能确定,有待将来研究。

 
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