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  “cis-9”译为未确定词的双语例句
     4)The concentration of cis9,trans11-CLA was positively and closely correlated with C18:1 trans-11 (P<001), but negatively with C18:2 cis-9,12 and C18:0 (P<001).
     4)瘤胃内容物中cis9,trans11CLA的含量与C18:1trans11的含量呈正相关(P<0.01),与C18:2cis9,12和C18:0的含量呈负相关(P<0.01)。
短句来源
     The concentrations of C18∶1~(trans-11), cis9,trans11-CLA and C18∶2~(cis-9,12) in ruminal contents were correlated linearly (P<(0.01)) with dietary NDF levels.
     瘤胃内容物中亚油酸、顺9,反11CLA和反11C18∶1的含量与日粮NDF水平呈极显著线性相关(P<0.01)。
短句来源
     The ratio between cis-9, trans-11 and trans-10, cis-12-CLA was 98.85:1.15 in non-aqueous system using GC.
     经GC分析,微水相体系中植物乳杆菌合成的CLA两异构体c9,t11和t10,c12分比例为98.85:1.15。
短句来源
     The strain could tolerate at 11.6%(1.024 mg/mL) LA and converte LA to CLA in MRS broth. The cis-9, trans-11 and trans-10, cis-12 isomers detected by Gas Chromatography were 75.9% and 24.1 % of the CLA produced.
     该菌株在MRS培养基中将质量分数11.6%的亚油酸(1.024mg/mL)转化为共轭亚油酸,经气相色谱分析证实c9,t11 18∶2占75.9%,t10,c12 18∶2占24.1%.
短句来源
     The ratio between cis-9, trans-11 and trans-10, cis-12-CLA was 64.7:35.3 in resting cells system using GC.
     经气相色谱分析知,共轭亚油酸c9,t11和t10,c12两异构体比例为64.7:35.3。
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  相似匹配句对
     9. D.
     hercolossum,9.肿节石斛D.
短句来源
     (9) C.
     ( 9)红花锦鸡儿C .
短句来源
     the majority of resultants were cis-,trans-9,ll-CLA.
     气相色谱结果显示产物CLA主要为cis-,trans-9, 11-CLA。
短句来源
     9-cis-RA has no effect in the expression of p53;
     9-顺-维甲酸不影响细胞中p53的表达;
短句来源
     C-E9 with 10;
     C-E9与其中的10种瘤细胞反应;
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  cis-
The prevalence of cis-9-hexadecenoic acid is a specific feature of the fatty acid profile of zygomycetes from the order Kickxell
      
When synthesized de novo, the lipids of these species show the prevalence of cis-9-hexadecenoic acid.
      
Beneficial effects on health parameters by ingestion of plant oils having high levels of monounsaturated fatty acids such as oleic (cis-9-octadecenoic) acid have been described in several studies.
      
Effect of cis-9, trans-11-conjugated linoleic acid on cell cycle of mammary adenocarcinoma cells(MCF-7)
      
Objective: To determine the effect of cis-9, trans-1 1-conjugated linoleic acid on the cell cycle of mammary cancer cells (MCF-7) and the possible mechanism of the inhibitory effect of c9,t11-CLA.
      
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A new method for the synthesis of polyene acids has been described.This consists of the condensation of crotonic ester or sorbic ester with suitable alde- hydes,followed by hydrolysis.Thus a C4 or C6 side chain with conjugated double bonds can be introduced in a single step.Condensation of methyl cro- tonate with benzaldehyde and with furfural in the presence of alcohol-free sodium methoxide gives,after hydrolysis,cis-δ-phenyl-△~(αγ)-pentadienoic acid(m.p.137.5- 138°)and cis δ-2-furan-△~(αγ)-pentadienoic...

A new method for the synthesis of polyene acids has been described.This consists of the condensation of crotonic ester or sorbic ester with suitable alde- hydes,followed by hydrolysis.Thus a C4 or C6 side chain with conjugated double bonds can be introduced in a single step.Condensation of methyl cro- tonate with benzaldehyde and with furfural in the presence of alcohol-free sodium methoxide gives,after hydrolysis,cis-δ-phenyl-△~(αγ)-pentadienoic acid(m.p.137.5- 138°)and cis δ-2-furan-△~(αγ)-pentadienoic acid(m.p.109-111°)respectively;while condensation of methyl crotonate with anisaldehyde under the same conditions gives a mixture which has been separated into two components:cis-δ-p-methoxy- phenyl-△~(αγ)-pentadienoic acid(m.p.115-118°)and its trans-isomer(m.p.180°, to liquid crystals and 220-221°,to clear liquid).All the above cis-acids have been converted without difficulty into the corresponding trans-acids. Condensation of sorbic ester with benzaldehyde in the presence of alcohol- free potassium methoxide gives,after hydrolysis,7-phenyl-heptatrienoic acid(m. p.189-190°,to liquid crystals and 199°,to clear liquid).

本文叙述了一种综合多烯酸的方法:将α-丁烯酸酯或α,γ-己间二烯酸酯与适当的醛缩合,再进行水解。这样,仅用一个步骤便可引进四个或六个碳原子的共轭双键的侧链。丁烯酸甲酯与苯甲醛或糠醛在去醇的甲氧基钠影响下缩合,得到顺-δ-苯基-戊间二烯酸(熔点137.5—138°)或顺-δ-2-呋喃-α,γ-戊间二烯酸(熔点109—111°);同样情形,α-丁烯酸甲酯与对-甲氧基苯甲醛缩合时得出顺-δ-对-甲氧基苯-α,γ-戊间二烯酸(熔点115—118°)及其反式的几何异构体(熔点:180°熔为液晶,220—221°熔为透明液体)。所有上述的顺式酸用汞弧光灯照射后,可全部转变为其相应的反式酸。α,γ-己间二烯酸甲酯与苯甲醛在去醇的甲氧基钾影响下缩合,水解后得到7-苯基-庚间三烯酸(熔点:189—190°熔为液晶,199°熔为透明液体)。

Sommaire.—On rappelle tout d'abord les principaux travaux effectués en photométrie des galaxies depuis une trentaine d'années: méthodes de la chambre à courte distance locale, de la Schraffier-Kassette, photoélectrique et du profil photométrique. On applique ensuite la méthode du cercle oculaire de Ch. Fabry à la détermination des magnitudes globales de 175 galaxies et à l'établissement d'une séquence photométrique de 40 nébuleuses groupées dans l'amas Virgo, de magnitude 9, 2 à 13,2. Les mesures faites avec...

Sommaire.—On rappelle tout d'abord les principaux travaux effectués en photométrie des galaxies depuis une trentaine d'années: méthodes de la chambre à courte distance locale, de la Schraffier-Kassette, photoélectrique et du profil photométrique. On applique ensuite la méthode du cercle oculaire de Ch. Fabry à la détermination des magnitudes globales de 175 galaxies et à l'établissement d'une séquence photométrique de 40 nébuleuses groupées dans l'amas Virgo, de magnitude 9, 2 à 13,2. Les mesures faites avec des diaphragmes d'ouvertures croissantes ont permis de mettre en évidence la contribution des régions périphériques et d'atteindre les magnitudes totales. Il ressort des comparaison des mesures "Fabry" aux résultats donnés par les diverses autres méthodes que: a) La méthode de la chambre à court foyer (Harvard, Lund) conduit à des résultats à la fois imprécis et entachés d'erreur systématique. b) La méthode extrafocale est également entachée d'erreur systématique. c) Les mesures photoélectriques et les magnitudes déduites des profils photométriques sont par contre en très bon accord avec les n()tres. Pour 64 galaxies résolues, la magnitude absolue M est bien représentée par une courbe de Gauss avec fréquence maxima à M=-15, ce qui conduit à doubler l'éclat moyen et par suite la masse moyenne des galaxies d'où un accroissement appréciable de la densité ρ de l'espace. La méthode de Fabry étant beaucoup trop lente pour l'étude de milliers de galaxies, on a cherché s'il serait possible d'obtenir rapidement leurs magnitudes en les comparant aux galaxies de la séquence Virgo. On a vérifié que cette méthode donnait des résultats corrects avec une précision suffisante pour les travaux de statistique: écarts moyens de l'ordre de ±0,2 magnitude.

本文先敘述三十年來关于河外星系光度方面做過的主要的工作:短焦距照相法,移盒法(Schraffier-Kassette),光電法与谱線轮廓光度法。跟着再提出我们所用的法布里(Ch.Fabry)的圓形目鏡法,和用这个方法测定的175个河外星系的总星等,并由此對於室女座星系圈內,由9.2至13.2星等的40个星系,建立了一个光度序(Séquence photomérique)。使用開孔逐漸增大的光(?)所作的测量,可以綜合周界区的光度,以求星系的总星等。由法布里方法的测量和由别的方法测得的結果比较,表现以下几个事实: a)短焦距照相法(Harvard,Lund)所得的结果,既不精確,又混有系统差在内。 b)焦外照相法也有系统差。 c)光电测量的结果和由轮廓光度導出的星等同我們的测量非常相合。对于64个可以分解的星系,绝對星等M很好发为高斯曲線所代表,其最大频率值在M=-15,由此结果,我們须將河外星系的平均亮度加倍,因此平均质量亦須加倍,于是空间的密度ρ有显著的增加。使用法布里的方法以研究数以千萬計的河外星系,過於缓慢,我們曾经研究過把它们和室女座內星系的光度序比较,是不是可以快速地得着它們的星等。结果证明由这方法...

本文先敘述三十年來关于河外星系光度方面做過的主要的工作:短焦距照相法,移盒法(Schraffier-Kassette),光電法与谱線轮廓光度法。跟着再提出我们所用的法布里(Ch.Fabry)的圓形目鏡法,和用这个方法测定的175个河外星系的总星等,并由此對於室女座星系圈內,由9.2至13.2星等的40个星系,建立了一个光度序(Séquence photomérique)。使用開孔逐漸增大的光(?)所作的测量,可以綜合周界区的光度,以求星系的总星等。由法布里方法的测量和由别的方法测得的結果比较,表现以下几个事实: a)短焦距照相法(Harvard,Lund)所得的结果,既不精確,又混有系统差在内。 b)焦外照相法也有系统差。 c)光电测量的结果和由轮廓光度導出的星等同我們的测量非常相合。对于64个可以分解的星系,绝對星等M很好发为高斯曲線所代表,其最大频率值在M=-15,由此结果,我們须將河外星系的平均亮度加倍,因此平均质量亦須加倍,于是空间的密度ρ有显著的增加。使用法布里的方法以研究数以千萬計的河外星系,過於缓慢,我們曾经研究過把它们和室女座內星系的光度序比较,是不是可以快速地得着它們的星等。结果证明由这方法所得的结果是正确的,精确度可以滿足统计工作的需要:平均差的数量级約為±0.2星等。

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...

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。

 
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