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solvent systems
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  溶剂系统
     Results The solubility of Azone in the six solvent systems was 0, 0.013%, 0.036%, 0.091%, 1.78% and 2.01%, respectively. The in vitro skin fluxes of the seven aciclovir gels through rat back skin were 0.584, 3.062, 3.32, 12.05, 88.23, 180.83 and 56.08 μg/cm2·h per hour, respectively.
     结果1-6号溶剂系统中,氮酮的溶解度分别为0、0.013、0.036、0.091、1.78及2.01%,而1-7号处方中阿昔洛韦的体外渗透速率(J)分别为0.584、3.062、3.32、12.05、88.23、180.83及56.08μg/cm2·h。
短句来源
     This method adopts the "Dry Column Vacuum Chromatography(DCVC)" and three different solvent systems. The purity and yield of 5-fluorouridine obtained were 98%and 92%,respectively.
     该方法采用干燥柱真空层析和三种不同的溶剂系统,使获得的5-氟尿苷的纯度达98%,收率为92%。
短句来源
     Optimization of the Solvent Systems for Thin-Layer Chromatography Ⅷ. External Punishment Function Method
     薄层色谱溶剂系统的最优化方法的研究第Ⅷ报外部惩罚函数法
短句来源
     Pattern Recognition of Solvent Systems
     溶剂系统的模式识别
短句来源
     Two solvent systems of different components and proportion were used as eluate for the determination of E3 and E2, E1. respectively.
     色谱柱填充料系国产青岛硅胶YWG-5μm,使用两种组成的溶剂系统分别测定E_3与E_2、E_1。
短句来源
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  溶剂体系
     The Effect of Solvent on the Phase Behavior and the Structure of the DBS/C_(10)H_(21)OH/Solvent Systems
     溶剂性质对DBS/C_(10)H_(21)OH/溶剂体系的相行为与结构的影响
短句来源
     Reactions of 99mTcO 4 -,acetylphenylhydrazine (PhNHNHCOCH 3),reducing agent (Sn2+,Triphenylphosphine,Tris(m sulfophenyl) phosphine) and ligand Et 2NCS 2Na in CH 3OH,C 2H 5OH and H 2O solvent systems were studied.
     研究了在CH3OH,C2H5OH,H2O3种溶剂体系中99mTcO4-,乙酰苯肼(PhNHNHCOCH3,APH)、还原剂(Sn2+、三苯基膦、三(间磺酸钠)苯基膦)与配体Et2NCS2Na的反应,以制备含[99mTcVN—Ph]3+核的新配合物[TcVCl(NPh)(Et2NCS2)2]。
短句来源
     Using the Vrentas-Duda model, solvent diffusion coefficients in typical polymer/solvent systems were predicted and compared with experimental data for evaluating availability of the model.
     研究Vrentas-Duda模型对典型高分子/溶剂体系中溶剂扩散系数的预测准确性,通过将预测值与实验值比较,评价该模型在不同高分子体系中的适用情况.
短句来源
     The active components (oligomeric flavanols,OF) in grape seeds were extracted with two solvent systems of V(acetone)∶ V (water)=2∶3 and V (ethyl acetate)∶ V (water)=8 5∶1 5 separately.
     采用V (丙酮 )∶V (水 ) =2∶3和V(乙酸乙酯 )∶V(水 ) =8 5∶1 5两种溶剂体系从葡萄籽中提取活性成分。
短句来源
     The main results were listed as follows: 1. PLA、PCL and PLGA(80/20) electrospun ultrafine fibers were prepared by using chloroform, chloroform/acetone, 1,2-dichloromethane and chloroform/ 1,2-dichloromethane as solvent systems.
     1. 以氯仿、氯仿/丙酮、1,2-二氯乙烷及氯仿/1,2-二氯乙烷为溶剂体系,制备了PLA、PCL 和PLGA(80/20)的电纺丝超细纤维。
短句来源
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  溶剂
     The Effect of Solvent on the Phase Behavior and the Structure of the DBS/C_(10)H_(21)OH/Solvent Systems
     溶剂性质对DBS/C_(10)H_(21)OH/溶剂体系的相行为与结构的影响
短句来源
     Reactions of 99mTcO 4 -,acetylphenylhydrazine (PhNHNHCOCH 3),reducing agent (Sn2+,Triphenylphosphine,Tris(m sulfophenyl) phosphine) and ligand Et 2NCS 2Na in CH 3OH,C 2H 5OH and H 2O solvent systems were studied.
     研究了在CH3OH,C2H5OH,H2O3种溶剂体系中99mTcO4-,乙酰苯肼(PhNHNHCOCH3,APH)、还原剂(Sn2+、三苯基膦、三(间磺酸钠)苯基膦)与配体Et2NCS2Na的反应,以制备含[99mTcVN—Ph]3+核的新配合物[TcVCl(NPh)(Et2NCS2)2]。
短句来源
     Results The solubility of Azone in the six solvent systems was 0, 0.013%, 0.036%, 0.091%, 1.78% and 2.01%, respectively. The in vitro skin fluxes of the seven aciclovir gels through rat back skin were 0.584, 3.062, 3.32, 12.05, 88.23, 180.83 and 56.08 μg/cm2·h per hour, respectively.
     结果1-6号溶剂系统中,氮酮的溶解度分别为0、0.013、0.036、0.091、1.78及2.01%,而1-7号处方中阿昔洛韦的体外渗透速率(J)分别为0.584、3.062、3.32、12.05、88.23、180.83及56.08μg/cm2·h。
短句来源
     Using the Vrentas-Duda model, solvent diffusion coefficients in typical polymer/solvent systems were predicted and compared with experimental data for evaluating availability of the model.
     研究Vrentas-Duda模型对典型高分子/溶剂体系中溶剂扩散系数的预测准确性,通过将预测值与实验值比较,评价该模型在不同高分子体系中的适用情况.
短句来源
     The active components (oligomeric flavanols,OF) in grape seeds were extracted with two solvent systems of V(acetone)∶ V (water)=2∶3 and V (ethyl acetate)∶ V (water)=8 5∶1 5 separately.
     采用V (丙酮 )∶V (水 ) =2∶3和V(乙酸乙酯 )∶V(水 ) =8 5∶1 5两种溶剂体系从葡萄籽中提取活性成分。
短句来源
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  “solvent systems”译为未确定词的双语例句
     The upward R_F values for the above four solvent systems are 0.40 ± 0.02, 0.83 ± 0.02, 0 and 1 respectively when Whatman No.
     它們的比移分別是0.40±0.02,0.83±0.02,0.87±0.01和0.88。
短句来源
     By paper chromatagraphy method, taking 0.9% Nacl(System Ⅰ) and 85%methanol (System Ⅱ) as two developing solvent systems, the Rf values of 99mTc,99mTc- colloid and 99mTc- MDP were determined.
     采用纸层析方法,以0.9%氯化钠(Ⅰ)和85%甲醇(Ⅱ)为两个展开剂系统,测定了99mTc、99mTc-胶体和99mTc-MDP的Rf值。
短句来源
     Removal of Fe(Ⅲ) from sulphate solutions by synergistic extraction using N_(235)-TBP mixed solvent systems
     用N_(235)-TBP混合体系从硫酸盐溶液中协同萃取除铁
短句来源
     An AgNO3-Thin-Layer Chromatography(AgNO3-TLC)method for the isolation of γ-linolenic acid in the content of PRFA was reported and the conditions were:the solvent systems of benzene-methanol-glacial acetic acid was 9+0 4+0 4respecfireh the color developmint reagent was ethanol solusion containing 10%(W/V)molybdophosphoric acid.
     用苯∶甲醇∶冰醋酸=9∶0.4∶0.4(V∶V∶V)作为混合展开剂,10%磷钼酸的乙醇溶液为显色剂,建立了硝酸银薄层色谱(AgNO3-TLC)法检测浓缩物中的γ-亚麻酸的简易方法。
短句来源
     METHOD The TLC Scanning was applied. The thin lay carried sample was detected by dual wavelengths reflection sawtooth scanning atλ s =254nm and λ R = 325nm after being developed by two solvent systems of ether methanol(4∶1) and toluene ethanol concentrated ammonia solution (16∶12∶1∶4) successively.
     方法 采用薄层扫描法测定骨筋丸胶囊中毒剧药马钱子中的士的宁的含量 ,以乙醚 甲醇 ( 4∶1) ,甲苯 丙酮 乙醇 浓氨水 ( 16∶12∶1∶4 )为展开剂 ,分两次展开 ,双波长反射法锯齿扫描 ,λs=2 5 4nmλR=32 5nm。
短句来源
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  solvent systems
The transferase reaction between phospholipids and inositol catalyzed by phospholipase D was studied at interfaces in water-organic solvent systems.
      
Optimum conditions were determined for phosphatidylinositol synthesis in heterogeneous water-organic solvent systems.
      
The preparations were studied by two-dimensional TLC using solvent systems chloroform-methanol-H2O MiLi Q (65 : 25 : 4, v/v/v) and n-butanol-acetic acid-H2O MiLi Q (60 : 20 : 20, v/v/v) for directions I and II, respectively.
      
Extraction Equilibria in the Fullerene C60-Fullerene C70-Solvent Systems
      
The results were compared with data for three other water-organic solvent systems.
      
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A method for the paper chromatography of aureomycin is here described. Out of 43 kinds of developing solvents studied, four have been proved satisfactory. They are: (1) n-butanol saturated with M/10 citrate buffer of pH 3.9, (2) 1% aqueous solution of boric acid, (3) M/10 citrate buffer of pH 3.9 saturated with n-butanol, and (4) n-butanol-acetic acid-water (5∶1∶4). The upward R_F values for the above four solvent systems are 0.40 ± 0.02, 0.83 ± 0.02, 0 and 1 respectively when Whatman No. 1 filter paper...

A method for the paper chromatography of aureomycin is here described. Out of 43 kinds of developing solvents studied, four have been proved satisfactory. They are: (1) n-butanol saturated with M/10 citrate buffer of pH 3.9, (2) 1% aqueous solution of boric acid, (3) M/10 citrate buffer of pH 3.9 saturated with n-butanol, and (4) n-butanol-acetic acid-water (5∶1∶4). The upward R_F values for the above four solvent systems are 0.40 ± 0.02, 0.83 ± 0.02, 0 and 1 respectively when Whatman No. 1 filter paper is used. For general purpose the first solvent is preferred. With this solvent, the R_F values for terramycin hydrochloride, streptomycin hydrochloride-calcium chloride complex and chloromycetin are 0.32±0.03, 0 and 1 respectively. Chromatograms containing aureomycin may be easily recognized with naked eyes if the amount of the antibiotic present is not less than 5 μg/cm~2, or by fuming with HC1- vapour to give an orange stain of anhydroaureomycin hydrochloride if not less than 1.6 μg/cm~2, or by agar-plate method if not less than 0.3 μg/cm~2, or by fluorescence method if not less than 0.09 μg/cm~2. Under an UV-lamp, aureomycin hydrochloride shows a bright lemon-yellow fluorescence; terramycin, dirty yellow; and anhydroaureomycin hydro- chloride-boric acid complex, dull brown. The fluorescing chromatograms can be photo- graphed. The present method can be directly employed for qualitative as well as rough quantitative determination of the aureomycin in the beer of Streptomyces aureofaciens. It may serve as a useful aid in antibiotic screening. By means of mixing chromatography, aureomycin may be detected in the human urine collected after oral administrations. Using 1% boric acid as the developing solvent, anhydroaureomycin hydrochloride can be successfully separated from aureomycin hydrochloride by chromatography. In fact, the existence of a trace of the anhydro-compound has been detected in some crude aureomycin preparations.

本報告提供了一個金黴素的紙上層析方法。在28°用Whatman 1號濾紙研究了43種紙上層析用的顯層溶劑。用其中的四種顯層溶劑,M/10檸檬酸鹽pH 3.9緩衝液飽和的丁醇(I),1%硼酸水溶液(II),丁醇飽和的M/10檸檬酸鹽pH3.9緩衝液(III),和丁醇-醋酸-水(5∶1∶4)(IV)顯層,都可以得到較滿意的色層。它們的比移分別是0.40±0.02,0.83±0.02,0.87±0.01和0.88。這四種中尤以顯層溶劑(I)的結果最佳。用顯層溶劑(I),在同一條件下的鹽酸地黴素、鹽酸鏈黴素氯化鈣複鹽和氯黴素的比移,分別是0.32±0.03,0和1。色層辨認的方法,在超過5微克/厘米~2以上可用肉眼;1.6微克/厘米~2以上可用氯化氫氣體顯色;在0.3微克/厘米~2以上可用瓊脂平板培養基制菌法;在0.09微克/厘米~2以上可用螢光法。色層螢光可以直接攝照。 應用本法可以直接鑑定金黴菌發酵液中的金黴素,並可以初步估計含量。用混合層析法也可以鑑定尿中的金黴素。 應用1%硼酸水溶液作顯層溶劑,可以鑑別鹽酸金黴素和鹽酸脫水金黴素,用本法曾鑑定了幾批鹽酸金黴素粗製品中有微量脫水化合物的存在。

The differential refractometer described here was designed on the principle of light refraction at two liquid interfaces. A beam of monochromatic light (436 or 546 mμ)passing through a hollow glass cell of square cross-section filled with solution and immersed in the solvent was refracted. The displacement of the slit images of the rays passing through the two halves of the solution prism was magnified by a lens of long focal length. To reduce the width of the image, a pair of double slits were set before the...

The differential refractometer described here was designed on the principle of light refraction at two liquid interfaces. A beam of monochromatic light (436 or 546 mμ)passing through a hollow glass cell of square cross-section filled with solution and immersed in the solvent was refracted. The displacement of the slit images of the rays passing through the two halves of the solution prism was magnified by a lens of long focal length. To reduce the width of the image, a pair of double slits were set before the lens. Three intensive interference fringes were obtained. The distance between the two images was then accurately deter-mined by a reading microscope. The refractometer has a sensitivity of △n=2.5×10~(-6). dn/dc data for 7 polymer-solvent or solute-solvent systems are given. For successful measurement, attention is called to the following remarks: (1) Due to large values of dn/dc for organic solvents, the temperature difference and fluctuation between the solution cell and the solvent cell should not exceed 0.005℃. (2) The cell should be so designed as to avoid distilling of solvent into the solution which causes continuous decrease of the concentration of the solution. (3) Aqueous solution of sucrose is preferred as standard solution for the calibration of the apparatus.

本示差折光计的设计是基于光线在两液体界面间折射的原理.准直的单色光线经过浸在溶剂中的溶液稜镜时产生的偏折,经长焦距成像镜放大隙缝光源的像移,用读数显微镜观察.成像镜前面有两个双隙缝使在成像处产生干涉条纹来减小像的宽度,使像移可更精确的测定.仪器经用标准溶液校正,灵敏度可达Δn=2.5×10~(-6).并着重讨论了恒温、折射池设计和标准液挑选对测定的影响. 利用这架示差折光计在使用单色光λ436和546mμ时,测定了聚甲基丙烯酸甲酯等七个高分子溶液和有机化合物溶液的(dn)/(dc).

Sulfur-containing amino acids were prepared and tested by various authors as possible antimetabolites for carcinostatic action.Thus β-alkylmercapto-α-aminopropionic acid,γ- ethylmercapto-α-aminobutyric acid and γ-(N-substituted-sulfamido)-α-aminobutyric acid have been synthesized.One of us (Yuen) has reported the inhibiting action of δ-mercapto- α-aminovaleric acid and ε-amino-α-mercaptocaproic acid on the growth of rat tumor. β-2-Thienyl alanine,being an isostere of phenyl alanine,is known as the antimetabo-...

Sulfur-containing amino acids were prepared and tested by various authors as possible antimetabolites for carcinostatic action.Thus β-alkylmercapto-α-aminopropionic acid,γ- ethylmercapto-α-aminobutyric acid and γ-(N-substituted-sulfamido)-α-aminobutyric acid have been synthesized.One of us (Yuen) has reported the inhibiting action of δ-mercapto- α-aminovaleric acid and ε-amino-α-mercaptocaproic acid on the growth of rat tumor. β-2-Thienyl alanine,being an isostere of phenyl alanine,is known as the antimetabo- lite of the latter.It is capable to produce some inhibition of the growth of the rat tumor. The present paper is concerned with the synthesis of various derivatives of β-(5-substituted- 2-thienyl)-alanine with the general formula X=H,NO_2,NHCOCH_3 R=H,OH,SR Described are the synthesis of β-(5-substituted-2-thienyl) alanine,-serine and -cystein by the sequence of reactions as shown by the scheme in the Chinese text. β-2-Thienyl serine (Ⅱa) as well as β-(5-acetamido-2-thienyl) serine (Ⅱc) were prepared by the condensation of the corresponding thiophene aldehyde (Ⅰ) with glycine in the presence of alkali and followed by acid cleavage of the resulting addition products.It was shown that 5-nitro-2-thiophene aldehyde was resistant to this reaction owing to the extreme unstabi- lity of the aldehyde toward alkali.As shown by paper chromatography,this aldehyde was decomposed completely before condensation.Consequently,β-(5-nitro-2-thienyl)-serine (Ⅱb) was prepared by condensation of 5-nitro-2-thiophene aldehyde with glycine ethyl ester in neutral medium. By the Erlenmeyer reaction,5-substituted-2-thiophene aldehyde was easily converted to 2-phenyl-4-(5′-substituted-2′-thenylidene)-5-azlactone (Ⅲ),the key intermediate in our synthesis.However,the conversion of the azlactone to corresponding amino acid by reductive hydrolysis,as previously reported for the synthesis of phenyl alanine,could not be applied to the compounds containing nitroacetamido-,thiophene and ester group. Catalytical reduction or by treatment with LiAlH_4 was also unsuccessful. Alcoholysis of the azlactone afforded the ethyl-(5-substituted-2-thienyl)-α-benzoyl amido- acrylate (Ⅴ) from which β-(5-substituted-2-thienyl)-S-alkylated cystein ethyl ester (Ⅳ) were synthesized by the addition of corresponding mercaptans.Unsuccessful attempts were made to hydrolyze the benzoyl and ester groups in the acid medium. The R_f of the mentioned racemic amino acids in various solvent systems were deter- mined.The anticancer activity of these compounds will be published elsewhere.

1.研究了5-取代-2-噻吩甲醛与甘氨酸在各种不同条件下的缩合反应,证明了5-硝基-2-噻吩甲醛可直接与甘氨酸乙酯在中性溶液中缩合,经水解后获得丝氨酸衍生物,层析纯的丝氨酸可用多次结晶获得.2.研究了2-苯基-4-(5′-取代-2′-噻吩亚甲基)-5-间氧氮环戊酮的水解,醇解,还原及硫醇加成反应证明前者性质与一般不饱和间氧氮环戊酮无大区别,惟各种还原反应的应用受到限制.3.合成了β-(5-取代-2-噻吩基)-β-氨基丙烯酸丝氨酸及半胱氨酸的衍生物,并测得了这些外消旋氨基酸在多种溶剂系统中的 R_f 值.

 
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