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anti conformation
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  反式构象
     The results show that, for the-CH_2-CH_2-X_n type "crown ether"compounds, when X is N or O, there are the maxmum X-CH_2-CH_2-X fragments in gauche conformation and CH_2-X-CH_2-CH_2 fragments in anti conformation with their lowest energy conformation, when X is S, they are all opposite.
     结果表明,对于(-CH_2-CH_2-X-)_n类的“冠醚”化合物,X=N,O时,其低能构象中有最多的X-CH_2-CH_2-X旁式和最多的CH_2-X-CH_2-CH_2反式构象; X=S时,情况与此相反。
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  “anti conformation”译为未确定词的双语例句
     Abstract In laser Raman spectrum of calf thymus DNA aqueous solution, the characteristical lines 671 and 682 cm-1 of deoxyguanosine sugsr ring packers, which expressed C3' endo/anti and C2' endo/anti conformation respectively, have been obtained Simultaneously, thus indicates that two type spatial conformation(A-and B- DNA) exsist in the DNA aqueous solution.
     小牛胸腺DNA水溶液激光拉曼谱中,表征鸟嘌呤苷糖环折叠分别为C3’内式与C2’内式的特征模671与682cm-1同时存在,我们认为这表明在DNA水溶液中具有A-DNA与B-DNA两种构象。
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  相似匹配句对
     Anti-S.
     体外模拟试验发现抗S.
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     Anti-H.
     方法:将H.
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     The Diffluence & Conformation
     分流与整合
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     The Conformation of Cyclododecene
     顺式环十二碳烯的构象
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     Molecular Conformation and Anti-tumor Activity of Truncated Cell Toxin, Gelonin
     截短型细胞毒素Gelonin的分子构象和抗肿瘤活性
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  anti conformation
We suggest that the relative stability of the anti conformation of cGMP be considered in studies, such as, enzyme docking.
      
For cAMP, we estimate the anti conformation to be more stable than the syn by about 6 kcal/mol.
      
Our best estimate from single-point IPCM B3LYP/6-31+G(d) calculations has the anti conformation 19 kcal/mol lower in energy.
      
However, we report here that the anti conformation is more stable in aqueous solution, according to estimates based upon results from both the Onsager model and the Isodensity Polarized Continuum Method (IPCM).
      
The mutual arrangement of the xylofuranose fragment and the nucleic base corresponds to the anti conformation.
      
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Abstract In laser Raman spectrum of calf thymus DNA aqueous solution, the characteristical lines 671 and 682 cm-1 of deoxyguanosine sugsr ring packers, which expressed C3' endo/anti and C2' endo/anti conformation respectively, have been obtained Simultaneously, thus indicates that two type spatial conformation(A-and B- DNA) exsist in the DNA aqueous solution. The calculated relstive content at 671 cm-1 of marker C3'-endo/anti dG is 39. 4%, be clack to the estimated 35% A-DNA content by the...

Abstract In laser Raman spectrum of calf thymus DNA aqueous solution, the characteristical lines 671 and 682 cm-1 of deoxyguanosine sugsr ring packers, which expressed C3' endo/anti and C2' endo/anti conformation respectively, have been obtained Simultaneously, thus indicates that two type spatial conformation(A-and B- DNA) exsist in the DNA aqueous solution. The calculated relstive content at 671 cm-1 of marker C3'-endo/anti dG is 39. 4%, be clack to the estimated 35% A-DNA content by the own modified Brown's method. The same conclusions have been qualitative confirmed with the other Raman frequencies diagnostic of both deoxyribeyl conformers and deoxyribosyl phosphoate backbone vibretions.This result will be of use for thoroughly reveals the interactive mechanism between the DNA and other substance molecules.

小牛胸腺DNA水溶液激光拉曼谱中,表征鸟嘌呤苷糖环折叠分别为C3’内式与C2’内式的特征模671与682cm-1同时存在,我们认为这表明在DNA水溶液中具有A-DNA与B-DNA两种构象。计算出671cm-1相对含量为39.4%,与用我们提出的Brown改进法I807/I1100计算得出的35%A型DNA构象合量相接近。其它的脱氧核糖构象拉曼模与磷酸脱氧核糖骨架振动特征模也定性地表明了同样的结论。这一认识将有利于深入了解DNA与其它分子相互作用的机制。

The energy calculations for 12-crown-4, 12-azocrown-4, 12-thiocrown-4, 18-crown-6,18-azocrown-6, 18-thiocrown-6 in different conformations have been carried ont with molecular mechanics method. The results show that, for the-CH_2-CH_2-X_n type "crown ether"compounds, when X is N or O, there are the maxmum X-CH_2-CH_2-X fragments in gauche conformation and CH_2-X-CH_2-CH_2 fragments in anti conformation with their lowest energy conformation, when X is S, they are all opposite.

用分子力学程序MMPM对12-冠-4、12-氮冠-4、12-硫冠-4、18-冠-6、18-氮冠-6、18-硫冠-6的不同构象的能量进行了计算。结果表明,对于(-CH_2-CH_2-X-)_n类的“冠醚”化合物,X=N,O时,其低能构象中有最多的X-CH_2-CH_2-X旁式和最多的CH_2-X-CH_2-CH_2反式构象;X=S时,情况与此相反。

A novel carbon carbon bond free radical initiator diisobutyl 2,3 dicyano 2,3 diphenyl succinate(DBCPS) was synthesized and characterized by elemental analysis, IR, FAB MS and \{\}\+1H NMR spectroscopy. The crystal structure of the compound DBCPS was determined by single crystal X ray diffraction techniques. The analytical results show that this crystal belongs to triclinic with space group \%P\%\-1, and the cell parameters are a =1 060 3(2) nm, b =1 470 2(3) nm, c =0 794 4 nm, α =93 40(3)°...

A novel carbon carbon bond free radical initiator diisobutyl 2,3 dicyano 2,3 diphenyl succinate(DBCPS) was synthesized and characterized by elemental analysis, IR, FAB MS and \{\}\+1H NMR spectroscopy. The crystal structure of the compound DBCPS was determined by single crystal X ray diffraction techniques. The analytical results show that this crystal belongs to triclinic with space group \%P\%\-1, and the cell parameters are a =1 060 3(2) nm, b =1 470 2(3) nm, c =0 794 4 nm, α =93 40(3)° , β =\{99 12(3)°\}, γ =103 90(3)°, V =1 180 8(4) nm 3, D c=1 216 Mg/m 3, Z =2, F (000)=452 The molecular structure of DBCPS exhibits as a central symmetry, anti conformation and mesomer and the severe steric hindrance in the molecule also exerts a distinct tension, abnormal bond angle and bond length. Its central C-C bond length is 0 159 2 nm, there is 0 048 nm elongated, and the elongation ratio 3 11%(the normal bond length is \{0 154 4 nm\}; and its corresponding ethyl derivative is 0 158 5 nm, the elongation ratio is 2 66%) There are two isomers, both \%meso\% and \%DL\%, can be found for dimethyl and diethyl derivatives respectively. However, because of the bigger steric hindrance, only one isomer, \%meso\% form which has a lower potential energy was obtained for DBCPS. The polymerization of methyl methacrylate(MMA) initiated by DBCPS showed the number average molecular weight of the polymer(PMMA) increased while both conversion and polymerization time were increased, and the molecular weight distribution decreased with the increasing of reaction time correspondingly. Hence, it is inferred that DBCPS can serves as a thermal iniferter and follows "living" free radical polymerization. The PMMA capped with the fragments initiated the polymerization of styrene to yield block copolymer PMMA b PSt.

合成了具有较大空间位阻的碳 -碳键型引发剂 2 ,3-二氰基 -2 ,3-二苯基丁二酸二异丁酯 ,测定了其分子结构 ,其中心碳 -碳键长达 0 .1 5 92 nm.对其引发甲基丙烯酸甲酯进行自由基聚合的研究结果表明 ,聚合物分子量随反应时间的延长而逐步增大 ,而聚合物分子量分布则逐渐变小 .聚合反应按照自由基“活性”聚合反应历程进行

 
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