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compounds     
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  化合物
     Third-order Optical Nonlinearities of PPV Derivatives and Metalloorganic Compounds
     PPV衍生物及金属有机配位化合物的三阶光学非线性研究
短句来源
     Studies on the Syntheses of Tripodal and Other Related Compounds and Their Coordination Properties with Metal Cations
     三脚架型和其它相关化合物的合成及其与金属离子的配位性能研究
短句来源
     Combinatorial Synthesis and Immunocompetence Study of a Series of Small-Molecular Compounds Related to Proglumide
     基于丙谷胺小分子化合物的组合合成及免疫活性研究
短句来源
     Chemistry and Bioactivity of the Heterocyclic Compounds Containing Phosphorus and Oxygen
     磷氧杂环化合物的化学及生物活性
短句来源
     Studies on the Bio-degradation and Treatment Techniques of Industrial Wastewater Containing Nitrobenzene Compounds
     含硝基苯类化合物工业废水生物降解及处理技术研究
短句来源
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  个化合物
     RESEARCH ON STEROID OXIMES(Ⅰ)SYNTHESIS AND BIOLOGICAL EVALUATION OF 43 COMPOUNDS
     甾体酮肟化合物的研究(Ⅰ)——43个化合物的合成和抗生育活性
短句来源
     Two compounds FW635I1 and FW635I2 with immunosuppressive activities were extracted by organic solvents from the culture broth and purified by silica gel column chromatography and high speed counter current chromatography. The structures of the two compounds were determined by physico-chemical properties and spectral analyses,the biological activities were assayed in vitro.
     发酵液用有机溶媒提取具有免疫抑制活性的化合物,采用硅胶柱层析及高速逆流色谱的分离方法,提取纯化到2个化合物FW635I1和FW635I2,通过理化性质测定和光谱学测定分析2个化合物的结构并对这两个化合物进行体外生物活性测定。
短句来源
     The results of preliminary pharmacological test showed that the activities of three compounds(I_1,I_8 and I_ 10)were stronger than aminoguanidine,especially for compound I_1.
     初步的iNOS抑制活性测定结果显示,3个化合物(I1,I8和I10)的活性强于阳性对照药氨基胍,其中化合物I1的活性是氨基胍的5.5倍。
短句来源
     From the ethanol extract of solid-state fermented culture of Aspergillus sp. 136, six compounds were isolated.
     从曲霉sp. 136的固体发酵物中分离得到6个化合物.
短句来源
     RESULT:Ten compounds were isolated and identified as nigaichigoside F1(1),nigaichigoside F2(2),Chebuloside Ⅱ(3),7α-hydroxy-sitosterol(4),7β-hydroxysitosterol(5),pagoside(6),procumboside(7),β-sitosterol(8),trans-cinnamic acid(9)and fructose(10).
     结果:从该植物块茎中分得10个化合物,分别鉴定为nigaichigoside F1(1),nigaichigoside F2(2),Chebuloside Ⅱ(3),7α-羟基-β-谷甾醇(4),7β-羟基-β-谷甾醇(5),pagoside(6),procumboside(7),β-谷甾醇(8),反式桂皮酸(9)和果糖(10)。
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  化合物的
     Third-order Optical Nonlinearities of PPV Derivatives and Metalloorganic Compounds
     PPV衍生物及金属有机配位化合物的三阶光学非线性研究
短句来源
     Studies on the Syntheses of Tripodal and Other Related Compounds and Their Coordination Properties with Metal Cations
     三脚架型和其它相关化合物的合成及其与金属离子的配位性能研究
短句来源
     Combinatorial Synthesis and Immunocompetence Study of a Series of Small-Molecular Compounds Related to Proglumide
     基于丙谷胺小分子化合物的组合合成及免疫活性研究
短句来源
     Chemistry and Bioactivity of the Heterocyclic Compounds Containing Phosphorus and Oxygen
     磷氧杂环化合物的化学及生物活性
短句来源
     Speciation of Sulfur Compounds and the Study of Reaction Mechanism in the Synthesis of Ammonium Thiocyanate
     硫化合物的形态分析与硫氰酸铵合成反应历程研究
短句来源
更多       
  类化合物
     Study on Ultrasonic Imaging of Impaired Liver and Kidney Caused by Organophosphorus Compounds Poisoning
     有机磷类化合物中毒所致肝肾损害的超声影像学研究
短句来源
     Studies on the Effects of Phenylallyl Compounds on Catabolizing Enzymes of PGE_2 and It' Integrated Action
     桂枝汤苯丙烯类化合物对PGE_2代谢关键靶点影响及其综合效应
短句来源
     Study on the Synthesis, Characterization, Quantum Chemistry Calculation and QSAR of the Novel Triazole Compounds
     新型三氮唑类化合物的合成、表征、量化计算及构效关系研究
短句来源
     STUDIES ON VITAMIN D Ⅱ.THE SYNTHESIS OF COMPOUNDS OF 2-SUBSTITUTED CIS-CYCLOHEXYLIDENE ACETIC ACID TYPE (I)2, 2-DIHYDROXY-CYCLOHEXYLIDENE ACETIC ACID LACTONE AND ITS ISOMERS
     维生素丁的研究Ⅱ. 2-取代-顺-亚环己基乙酸类化合物的合成(一)2,2-双羟亚环己基乙酸内酯及其异构体
短句来源
     STUDIES ON VITAMIN D Ⅳ. THE SYNTHESIS OF COMPOUNDS OF 2-SUBSTITUTED CISCYCLOHEXYLIDENE ACETIC ACID TYPE (3) 2-HYDROXYMETHYL-CIS-CYCLOHEXYLIDENE ACETIC ACID AND MANNICH-BRAUN COMPOUND
     维生素丁的研究 Ⅳ.2-取代-顺-亚环己基乙酸类化合物的合成(三) 2-羥甲基-顺-亚环己基乙酸及Mannich-Braun化合物
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  compounds
Improgan-like Analgesics: A Family of Compounds Derived From Histamine Anatgonists
      
3D QSAR ANALYSIS OF SOME HETEROCYCLIC COMPOUNDS AS CYCLOOXYGENASE-2 INHIBITORS
      
Isolation of the natural products from the stems of Jatropha maheshwarii yielded 5 compounds such as Friedelin (0.16%), epi-friedelinol (0.12%), n-octacosanol (0.11%), β-sitosterol (0.2%), and β-sitosterol-3-β-D-glucopyranoside (0.24%).
      
Guanidine-like compounds have been investigated since the first observations of their therapeutic potential some 30 years ago in fields of cancer and virology.
      
Guanidine-type compounds that reached clinical status include amongst others the potassium channel opener, pinacidil and the histamine H2-receptor antagonists (e.g.
      
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This paper presents an investigation of the"Automatic Operator" of Diesel Loco-motive based on the principle of compound programming control. According to the sur-rounding conditions of locomotive, the"Automatic Operator"can change its structure automatically in order to obtain better quality of control.In this paper, the principle scheme, the characteristics of"Automatic Operator" and the experimental results of automatic control of Diesel locomotive with "Automatic Operator"are presented, the principle...

This paper presents an investigation of the"Automatic Operator" of Diesel Loco-motive based on the principle of compound programming control. According to the sur-rounding conditions of locomotive, the"Automatic Operator"can change its structure automatically in order to obtain better quality of control.In this paper, the principle scheme, the characteristics of"Automatic Operator" and the experimental results of automatic control of Diesel locomotive with "Automatic Operator"are presented, the principle and the design of logical circuit for changing the characteristics of"Automatic Operator"is emphasized. The latter part of the paper in-cludes a discussion of quality of control; and finally, formulas for determining the para-meters of the control system are derived.

文内介绍了采用复合控制原理和根据机车所处客观条件自动切换系统结构的内燃机车程序控制方案,介绍了按此方案制成的(自动司机)总体线路及其性能.介绍了利用这台控制机进行内燃机车自动驾驶的全面试验结果.文中着重讨论了自动切换系统结构的逻辑装置的设计计算.给出了综合这类系统参数的计算公式.此外,对系统的控制质量进行了详细讨论.

A new method for the biological assay of vegetable purgatives based on the numbers of wet faeces excreted by groups of mice after dosing is described. The relation of the number of wet faeces per group of mice to the logarithm of the dose was found to be linear. A cage has been specially designed for this assay and it has been found advantageous to incorporate a definite proportion of water in the diet during test. 40 mice divided equally into 4 groups were used in each assay. 2 groups received the standard...

A new method for the biological assay of vegetable purgatives based on the numbers of wet faeces excreted by groups of mice after dosing is described. The relation of the number of wet faeces per group of mice to the logarithm of the dose was found to be linear. A cage has been specially designed for this assay and it has been found advantageous to incorporate a definite proportion of water in the diet during test. 40 mice divided equally into 4 groups were used in each assay. 2 groups received the standard preparation and the other 2 groups received the test preparation. The standard deviation of a single determination based on 9 such assays was estimated to be 15.7 per cent. For rhubarb and its preparations, a“6-point”assay is advocated. With suitable restric-tion in the design of the assay, it is possible to calculate the potency by simple methods. Powdered crude drugs are used as laboratory standards in the assay of senna and rhubarb. The doses of cascara bark required to produce distinctive responses are too inconveniently large to be administered in suspension. It was found possible to use a potent extract of cascara in place of the powdered bark as a laboratory standard. Examples of the assay and the subsequent calculations are given. The method described is not only convenient in use but also gives a comparatively high degree of accuracy. The method has been successfully applied to senna leaf, senna fruit, rhubarb, cascara sagrada and extracts and commercial preparations made from these drugs, pure glycosides(sennosides A and B) and pure anthracene compounds(aloe emodin and aloe-emodine anthranol).

(1)本文详述植物性泻药的一种新的生物测定法,此法係用小白鼠在服药后所排出的濕粪数为基础,以定泻药的效价。(2)小白鼠服药後所排出的湿粪数与剂量指数的关係经证明为一直线。(3)本法所用鼠笼係特别设计,并证明在饲料内加入一定量的饮水,具有多种优点。(4)番泻效价的测定,每次用小白鼠4组,每组10只。2组给与标准品,另外2组给与试验品。根据9次试验的结果,试验的标准差是15.7%.(5)大黄效价的测定,以采用“6点”法为宜,即每次试验用小白鼠6组,3组给与标准品,另外3组给与试验品,所得的准确度与上述相仿。波希鼠李皮浸膏的效价测定,则用“4点”法或“6点”法均可。(6)所有试验一律采用粉状生药为实验室的比较标准,但是波希鼠李皮的效价太低,它的粉末不适於作为标准之用,可用波希鼠李皮乾浸膏来代替,作为比较标准。(7)本文对於效价测定及其计算方法都举例说明,并介绍了比较常法为简捷的相关效价计算法。(8)本法不但方便易行,而且有相当高的准确度;曾用在番泻、大黄、波希鼠李皮及其制剂,以及一些纯粹的蒽醌衍生物的效价测定,都获得了满意的结果。

In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the...

In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reaction:6NaF+FeCl_3→Na_3FeF_6+3NaCl. But the sodium ferric fluoride thus formed is fairly soluble in water and makesthe end-point unclear,therefore the titration can not be performed accurately.This seems to be due to the fact that the following two reactions advancesimultaneously,and accordingly the formation of sodium ferric fluoride is in-complete in aque(?)us medium:3NaF+Fe(NO_3)_3→FeF_3+3N_aNO_33NaF+FeF_3→Na_3FeF_6Nevertheless,these reactions,according to the author's experiments;proceedalmost quantitatively in meda.containing at least 50% by volume of alcohol.This paper reports the xperimental results obtained in the fundamentalstudies on the various factors influencing the accuracy of the volumetry,namely,the sensitivity and the necessary amount of sodium salicylate used asindicator,the pH value,the alcoholic concentration of the titration medium,the concentration of the fluoride taken for the determination and the timewhen alcohol should be added in the course of titration.Furthermore,a rapidvolumetric process with high accuracy is proposed together with its applicationsin ordinary analyses of sodium fluoride and other fluorine compounds.The proposed method is characteristic in using sodium salicylate asindicator,which shows sharp violet color with minute amount of ferric ion inmedium of pH 3 controlled with buffer solution,then titrating with standardferric nitrate,and adding proper amount of alcohol(the alcoholic concentra-tion at the end-point should be above 50%)during the titration,when themedium becomes orange yellow in color.The method may be summarized as follows:Take 5 ml of neutral sodiumfluoride solution of about 0.3 N in a small Erlenmeyer flask,add 2.5 mlof Walpole's buffer solution of pH 3(formed by dissolving 34.0 g ofcrystalline sodium acetate and 20 ml of 38% HCl in water,and making upto 250 ml)and 1 ml of 0.1 M sodium salicylate dissolved in 50% alcohol.After sufficient stirring,titrate with standard 0.3 N(0.05 M)ferric nitratesolution,using micro-burette until the medium becomes orange yellow,thisstep being reached after addition of about 4 ml of titrant.Then decolorizethe solution by adding 12.5 ml of absolute alcohol(or 13 ml of 95% alcohol),previously purified by redistillation with lime;stirring is necessary during theaddition.Further continue the titration until the light pink color formeddoes not fade after stirring for 30 seconds when observed over a white surface. In the analyses of sodium fluoride and other fluorine compounds con-taining interfering substances,such as divalent and polyvalent metallic ions,phosphate,silicate,borate,carbonate,sulfide ions and reductants acting on ferricion,it is necessary to separate fluorine from these interfering substances bythe distillation with sulfuric acid according to the method of Willard andWinter(20).Then the distillate is neutralized with dilute sodium hydroxideand adjusted to the proper pH with hydrochloric acid using p-nitrophenol asindicator.The solution is ready for titration as described.But in the caseof absence of these interfering substances except carbonate,for example,inthe determination of the concentration of sodium fluorde solution obtained bythe extraction of the crude product,produced industrially by fusing fluorsparwith sodium carbonate and silica,the above separation of fluorine by dis-tillation is dispensable.The anaIytical results obtained by the proposed method are in goodagreement with those obtained by the lead chlorofluoride process(8),whichis recognized as official method for the determination of fluorine in agriculturalproducts.

本文介绍一容量分析氟的新方法和在工业制品上的应用,并分析了一种工业制备的氟化钠液,所得的结果和氟氯化铅法所得的极为一致。对于影响该分析法准确度的各种因素:指示剂的灵敏度和滴定时适宜的用量、溶液的 pH 值、应加的乙醇量、操作中加乙醇的次序、以及氟离子的适宜浓度,均加以研究并找出适宜的情况。本法用硝酸铁为标准液,水杨酸钠作指示剂,在 pH=3左右作滴定;当溶液呈橙黄色时,加入适量的乙醇,使其浓度在终点时仍不低于50%。如有干扰物质如二价及多价金属离子、磷酸根、矽酸根、硼酸根、碳酸根、硫化物和还原物质可能与三价铁起作用者,均应分离之。

 
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