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等电
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  isoelectric
     A STUDY ON ISOELEGTRIC POINTS OF SILK FIBROIN BY ISOELECTRIC FOCUSiNG
     用等电聚焦法研究家蚕丝素的等电
短句来源
     ISOELECTRIC FOCUSING STUDIES OF THE POLYMORPHISM OF THE RED CELL PHOSPHO GLUCOIMUTASE (PGM LOCUS 1) IN CHINESE
     中国人红细胞PGM(PGM位点1)多态性的等电聚焦电泳研究
短句来源
     Trees' Resistance to the SO_2 in Atmosphere - a Study on Relationship between pH, Isoelectric Point, Buffer Capacity of leaf Sap and SO_2-resistance of Trees
     树木对SO_2的抗性机理——叶细胞的pH值、等电点、缓冲容量与抗SO_2的关系
短句来源
     Adsorbing Glutamic Acid from the Crystallization mother Liquid of Isoelectric Point with a NH_4~+ form Cation Exchange Resin
     用NH_4~+型阳离子交换树脂从等电点结晶母液中吸附谷氨酸Ⅱ.
短句来源
     AN APPLICATION OF ISOELECTRIC FOCUSING ELECTRO-PHOREIS TO THE STUDY OF BIOCHEMICAL CLASSIFICATION OF HAEMADIPSA
     薄层等电聚焦电泳技术应用于山蛭的分类研究
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  iso-electric
     Iso-electric point sedimentation collecting method was the most efficient and economic method to collect the bacteria cells after fermentation, with the optimum sediment pH of 3.67, 4.02, and 3.40 for the strains Lt7222, Gy7018 and Lt7511, respectively.
     菌体收集以等电点沉降法效率最高、成本最低,其中菌株 Lt7222 的最适沉降 pH 为 3.67、Gy7018 为 4.02、Lt7511 为 3.40。
短句来源
     The electrokinetic behaviours of TiO_2-water, Fe_2O_3-water and Sb_2O_3-water dispersions are determined. No work about Sb_2O_3-water dispersion system has been reported in literature. The iso-electric points for the above systems are 4.2, 5.3 and 2.1 respectively.
     测定了TiO_2、Fe_2O_3、Sb_2O_3水分散系的电动行为,其等电点(iep)分别为4.2、5.3、2.1。
短句来源
     The PI value of 5.3 was determined by iso-electric focusing.
     经等电聚焦电冰分析,等电点(PI)为5.3.
短句来源
     Results The protein eluted in 1.0~1.6 mol·L-1 NaCl from the heparin-sepharose was mitogenic for 3T3 cells, and this protein had a molecular weight of 23.0~26.9 kDa and iso-electric point of about 4.6. Conclusions The fact that the above-mentioned biochemical properties differed from that of PDGF, IGF and FGF suggests that this mitogenic protein may be a separate growth factor.
     结果表明,该条件培养基经肝素亲和层析,被1.0~1.6mol·L'NaCl洗脱下来的蛋白质成分对3T3细胞有致有丝分裂活性,其分子量范围为23.0~26.9kDa,等电点约为4.6。 这些生物化学特性不同于PDGF、IGF及FGF,提示这种致有丝分裂蛋白质可能是一种独立的生长因子。
短句来源
     The recombinant protein was expressed as a soluble product in E. coli. The iso-electric point was 8.5. A series of purification steps, including cell breakage by sonication, regulating solution pH5.6, 55~60C heating for 4min, and 20%(NH4)2SO4 precipitation.
     重组蛋白以可溶性的形式表达,等电聚焦电泳测定其等电点为8.5,通过超声破碎细胞,调节pH5.6,55~60℃加热4min,20%饱和(NH_4)_2SO_4沉淀等步骤,重组蛋白的纯度可达92%,回收率达57.5%。
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  “等电”译为未确定词的双语例句
     Study and Application of Equipotential-Point Reduction Bleaching of Protein Fibres
     等电点还原法漂白蛋白质纤维的研究和应用
短句来源
     Calculations of oscillator strengths of lithium-like isoelectronic sequence
     类Li等电子序列振子强度的计算
短句来源
     Detsction of α_1-Aotitrypsin (PI) Variants by Isoelcctrofocusing
     等电聚焦电泳对人体α_1-抗胰蛋白酶变异体的检测
短句来源
     STUDY ON IDENTIFICATION OF LIVER ISOFERRITIN BY ISOELECTROFOCUSING IN THIN-LAYER POLYACRYLAMIDE GELS
     薄层聚丙烯酰胺等电聚焦电泳鉴定肝脏同工铁蛋白的研究
短句来源
     Induction and Study on the Structure of Isoclectronic Body
     等电子体结构的归纳与研究
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  isoelectric
A comparative molecular analysis of the nucleotide sequence in National Center for Biotechnology Information (NCBI) databases showed that it shared 95% homology with the gene of Arabidopsis thaliana (MIP-C), with a theoretical isoelectric point 8.84.
      
The xooR gene is a transcription factor with 765 bp in length, and encodes a 254-amino acid putative protein with a molecular weight and an isoelectric point of 28.3 ku and 8.72 respectively.
      
The proteins were extracted by Trichloracetic acid (TCA) method, and then separated by isoelectric focusing as the first dimension and SDS-PAGE as the second dimension.
      
After analysis with software (ImageMaster 2D), 122 different proteins were detected; isoelectric point (pI), Molecular weight (MW) and relative volume of each protein in the pollen were also discovered.
      
The isoelectric points of these isoenzymes were found to be 3.5 and 4.2, respectively.
      
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  iso-electric
Salt ion could increase the solubility at the iso-electric point pH and slightly decreased the solubility at the pH value higher than that of the iso-electric point.
      
Iso-electric focusing of aqueous humour IgG in multiple sclerosis
      
The high iso-electric point (IEP) of the silane A1100-treated fibres shows that basic groups dominate at these surfaces.
      
The molecular weight and the iso-electric point of these fractions were determined by NaDodSO4-polyacrylamide gel electrophoresis (SDS-PAGE) and iso-electric focusing, respectively.
      
These isozymes were identified and separated by preparative iso-electric focusing.
      
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In this paper, a method for the systematic and quantitative evaluation of the inductive effect exerted over a certain chemical bond in the molecule by a group, from the electronegativities and the atomic radii of its constituent elements, has been presented. The constant for the inductive effect of the group thus obtained is designated as the inductive effect index of the group. It has been found that for a given reaction, the energy changes, the logarithms of the equilibrium constants, and the logarithms of...

In this paper, a method for the systematic and quantitative evaluation of the inductive effect exerted over a certain chemical bond in the molecule by a group, from the electronegativities and the atomic radii of its constituent elements, has been presented. The constant for the inductive effect of the group thus obtained is designated as the inductive effect index of the group. It has been found that for a given reaction, the energy changes, the logarithms of the equilibrium constants, and the logarithms of the rate constants can be expressed, respectively, as linear functions of the corresponding inductive effect index involved in the reaction, and that the percentages of chemical changes in the reaction, such as percent yield and conversion, give "sigmoid" curves when plotted versus the latter. These linear functions and sigmoid curves constitute a general quantitative relationship between molecular structure and chemical reactivity.

本文中提出由元素的电负性及原子共价半径两种基本常数以系统计算非共轭体系中基团诱导效应的方法,所得出的诱导效应指数与非共轭化合物在各种反应中的能量变化,平衡常数对数与速度常数对数均形成直筱关系。反应中化学变化的百分率,如产率及转化率等,则与诱导效应指数形成S形曲线。在计算方法中,共价键A—B的极性,以两成键原子的电负性分数,xA/xA+xB,及xB/xA+xB之差δ(键极性指数)表示。一键对于邻近各键上的诱导效应,以这键上的极性强度δ/r,为计算基数,其中r为键的长度。在一非共轭体系中,作用于A—B键的诱导效应,以直接或间接联结于A—B的各键的极性强度,依照远近次序相加的总和i表示: 或简写为其中1,2,3,4……代表各键联结于A—B上的次序,a是代表诱导效应传递时递减率的常数。与A—A键比较,由B原子及其所带基团对于A—B键上所产生的极性效应,以包括B原子在内的全部基团对A—B的诱导效应指数I表示: 如果分子中B,C,…等原子带有形电荷N_1,N_2…等,则除计算i值时应采用由于电荷而校正的原子电负性及共价半径外,还应加由电荷所引起的诱导效应i_+或i_-: 其中r′是带电荷的原子的共价半径;因此总的诱导效应...

本文中提出由元素的电负性及原子共价半径两种基本常数以系统计算非共轭体系中基团诱导效应的方法,所得出的诱导效应指数与非共轭化合物在各种反应中的能量变化,平衡常数对数与速度常数对数均形成直筱关系。反应中化学变化的百分率,如产率及转化率等,则与诱导效应指数形成S形曲线。在计算方法中,共价键A—B的极性,以两成键原子的电负性分数,xA/xA+xB,及xB/xA+xB之差δ(键极性指数)表示。一键对于邻近各键上的诱导效应,以这键上的极性强度δ/r,为计算基数,其中r为键的长度。在一非共轭体系中,作用于A—B键的诱导效应,以直接或间接联结于A—B的各键的极性强度,依照远近次序相加的总和i表示: 或简写为其中1,2,3,4……代表各键联结于A—B上的次序,a是代表诱导效应传递时递减率的常数。与A—A键比较,由B原子及其所带基团对于A—B键上所产生的极性效应,以包括B原子在内的全部基团对A—B的诱导效应指数I表示: 如果分子中B,C,…等原子带有形电荷N_1,N_2…等,则除计算i值时应采用由于电荷而校正的原子电负性及共价半径外,还应加由电荷所引起的诱导效应i_+或i_-: 其中r′是带电荷的原子的共价半径;因此总的诱导效应指数是 I=i_0+i+i_±由这样计算出的诱导效应指数,可以正确推出英国学派的全部耢导效应序列及Kharasch等的脂肪基团的相对电负性序列。这指数与Taft的取代基极性常数σ~*基本上完全平行,与由其他方法算出的氢化物中氢的部分电荷也基本上平行。它与脂肪族卤化物及腈类等的电偶极矩形成良好的直线关系。这些事实都说明诱导效应指数能够定量代表有关的诱导效应。非共轭化合物中化学活性与诱导效应之间的关系,可以下式表示: E=AI+B logK=aI+b或log(K/K_0)=aI logk=a′I+b′或log(k/k_0)=a′I 其中E为反应中的能量变化及与键能有直接关系的能量性质,K为反应平衡常数,k为反应速度常数;A,B,a,b,a′,b′均为常数,其值由反应类型及反应条件决定。在很多情况下,用为基准的氢原子也包括在这种关系之内。文中列举各种类型的有机及无机化合物的几百种E,K及k以表明上述几种直线关系的普遍存在。文中讨论诱导效应指数的适用范围,指出在基团立体障碍很大与立体效应不相同的情况下,及共轭效应起主导作用,而又不恒定的情况下,诱导效应指数与化学活性之间并无上述的几种直线关系。最后文中讨论诱导效应指数的用途。一是建立一种统一的定量的诱导效应序列,二是直接表达分子结构与化学活性间的定量关系,三是验证化合物的分子结构式,四是区别分子中不同位置上同种基团的活性,五是推断某些反应的机构,并各以例说明。

Complex formation of cupric dithiooxamide in ethenol-water Solution was studied by methods of eletric conductivity, pH titration, electrophoresis and coagulation value measurement. Results show that the composition of the complexcompound formed can be expressed as follows: HR-(-Cu—R-)_n-H.xH_2O or HR-(-Cu—R-)_(n-1)—CuCl·xH_2O (RH_2 represents rubeanic acid), mean value of n being 5~10. When cupric ion was in exsess, the complex formed a postive colloid: {x[HR-(-Cu—R-)_n-H]·yCu~(2+)·zCl~-}~(m+)+m Cl~- (a) {x[HR-(-Cu—R-)_n-H]·yHR-(-Cu—R-)_(n-1)—Cu~+·zCl~-}~(m+)+mCl...

Complex formation of cupric dithiooxamide in ethenol-water Solution was studied by methods of eletric conductivity, pH titration, electrophoresis and coagulation value measurement. Results show that the composition of the complexcompound formed can be expressed as follows: HR-(-Cu—R-)_n-H.xH_2O or HR-(-Cu—R-)_(n-1)—CuCl·xH_2O (RH_2 represents rubeanic acid), mean value of n being 5~10. When cupric ion was in exsess, the complex formed a postive colloid: {x[HR-(-Cu—R-)_n-H]·yCu~(2+)·zCl~-}~(m+)+m Cl~- (a) {x[HR-(-Cu—R-)_n-H]·yHR-(-Cu—R-)_(n-1)—Cu~+·zCl~-}~(m+)+mCl (b) Isoelectric point of the rubeanic acid was betermined by electrophoresis and found to be pH 2.6.

(一)本文用电导、pH、电泳和聚沉值测定等方法研究了二硫代乙二酰胺与銅络合物在水——乙醇混合溶液中的生成,根据研究结果分析,认为生成结合物组成如下:HR-(-Cu—R-)H·xH_2O和HR-(-Cu—R-)CuCl·xH_2O,视溶液中金属离子和配体的浓度而定,平均n值约为5~10,当金属离子过量时,体系中结合物形成不稳定胶粒,可以如下组成表示: (二)用电泳法测定了水——乙醇溶液中红氨酸等电点(pH2.6)。

In a wide pH range, the change of acidity of silicic acid solution was studied during the process of polymerization, it was found that when the initial acidity of the solution was higher than that of the isoelectric point, the hydroxyl ion concentration of the solution decreased during polymerizaion and the increment, △[OH], was therefore negative, and when the initial acidity was lower, △[OH~-] increased with the concentration of silicic acid and the initial pH of the solution. On the basis of the theory proposed...

In a wide pH range, the change of acidity of silicic acid solution was studied during the process of polymerization, it was found that when the initial acidity of the solution was higher than that of the isoelectric point, the hydroxyl ion concentration of the solution decreased during polymerizaion and the increment, △[OH], was therefore negative, and when the initial acidity was lower, △[OH~-] increased with the concentration of silicic acid and the initial pH of the solution. On the basis of the theory proposed previously that polymerization of silicic acid proceeds according to two different mechanisms, the above findings are explained. When the initial acidity of the solution was high, polymerization of silicic acid proceeded by olation of a neutral molecule with a positive ion of the acid, and during the whole process, hydrogen ions were given out and hence hydroxyl ion concentration decreased. When the acidity was low, polymerization of silicic acid was oxolation of a neutral molecule with a negative ion of the acid with elimination of a hydroxyl ion and hence the amount of this ion in solution increased during the process. When the acidity was at the isoelectric point and in its neighborhood, both olation and oxolation took place during the polymerization process, and so no noticeable change in pH of the solution was observed.

一、在較广pH范圍内,研究了硅酸在聚合过程中溶液酸度变化的現象。在硅酸溶液原始酸度小於等电点的pH值吋,溶液原始氢氧离子濃度与最后氫氧离子濃度之差△[OH]为負值;大於等电点时,△[OH]值随原始pH值和濃度增高而增加。二、根据以前所提硅酸聚合的两种机制,說明了在原始溶液酸度小於等电点pH值时,硅酸的聚合是硅酸的中性分子和負离子的氧鍵合作用,有氢氧离子釋出,故溶液中的这种离子增多;原始溶液酸度大於等电点pH值时,硅酸的聚合作用中有氫离子釋出,故溶液中氫氧离子減少;在等电点及具附近,硅酸同时以两种方式聚合,故溶液酸度无显著变化。

 
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