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uv
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  相似匹配句对
     V(G),uv(?)
     V(G),uv(?)
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     UV Solidificationg
     UV固化
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     UV Ink
     UV油墨
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     ultraviolet(UV) radiation;
     紫外光(UV)照射;
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  uv
Ultraviolet (UV) melting curves of the DNA at 260 nm as well as the calorimetric measurements were used to estimate the binding constants (K), melting enthalpy (ΔH°m) and binding enthalpy (ΔH°b).
      
Two compounds were designed, synthesized, and characterized by 1H-nuclear magnetic resonance (1H-NMR), ultraviolet (UV)-visible, and matrix-assisted laser desorption/ionization (MALDI) mass spectra.
      
The photocatalytic degradation of aniline on the composite films was carried out in a TiO2/UV system.
      
But when it was irradiated under UV illumination or solar irradiation for some time, the catalyst could be reused without loss of catalytic activity.
      
The UV-vis absorption and fluorescence spectra, thermal stability of spectral property, phase transition behavior and morphology of the synthesized polymers were investigated.
      
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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 is...

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。

Reaction between 4, 4'- di-[dimethylamino]-diphenylmethane (Ⅰ) and iodosyl sulfate (Ⅱ) in concentrated sulfuric acid solution gave an iodine heterocycle, 3, 6-di-[dimethylamino]-dibenzopyriodonium iodide dihydriodide(Ⅲ_a·2HI), m.p. 179—181° (decomp.), with a yield of 77%. The free iodide (Ⅲ_a), m.p. 195.5° (decomp.), was obtained, when the dihydriodide (Ⅲ_a·2HI) was treated with dilute sodium hydroxide solution and chloroform. The thermal decomposition of the iodide (Ⅲ_a) at its melting point yielded 2, 2'-diiodo-4,...

Reaction between 4, 4'- di-[dimethylamino]-diphenylmethane (Ⅰ) and iodosyl sulfate (Ⅱ) in concentrated sulfuric acid solution gave an iodine heterocycle, 3, 6-di-[dimethylamino]-dibenzopyriodonium iodide dihydriodide(Ⅲ_a·2HI), m.p. 179—181° (decomp.), with a yield of 77%. The free iodide (Ⅲ_a), m.p. 195.5° (decomp.), was obtained, when the dihydriodide (Ⅲ_a·2HI) was treated with dilute sodium hydroxide solution and chloroform. The thermal decomposition of the iodide (Ⅲ_a) at its melting point yielded 2, 2'-diiodo-4, 4'-di-[dimethylamino]-diphenylmethane, m. p. 124°, picture, m. p. 153.5—154.5°. The iodide (Ⅲ_a) could be converted to the formate (Ⅲ_a), m.p. 136.5° (decomp.), by treating its solution in formic acid with silver oxide. The formate (Ⅲ_a) was found to be readily converted to other salts, when its saturated alcoholic solution was reacted with corresponding acids [excepting for thiocyanate (Ⅲ_a), potassium thiocyanate was used] or phenolic compounds, respectively. The melting points (with decomposition) of these salts are as follows: Bromide (Ⅲ_b), 197.5°; chloride (Ⅲ_c), 197.5°; thiocyanate (Ⅲ_e), 153.5—155°; picrate (Ⅲ_f), 152—153°; benzoate (Ⅲ_g), 144°; o-nitrobenzoate (Ⅲ_h), 128—130.5°; cinnamate (Ⅲ_i), 117.5°; oxalate (Ⅲ_j), 159°; malonate (Ⅲ_k), 130°; maleate (Ⅲ_l), 160°; fumarate (Ⅲ_m), 171—171.5°; tartate (Ⅲ_n), 153.5—154°; malate (Ⅲ_o), 156.5°; p-cresolate (Ⅲ_p), 130°; p-chlorophenolate (Ⅲ_q), 129°; α-naphtholate (Ⅲ_r), 128.5—129°; o-nitrophenolate (Ⅲ_s), 138.5°; m-nitrophenolate (Ⅲ_t), 129.5—130°, p-nitrophenolate (Ⅲ_u), 124°; 2, 4-dinitrophenolate (Ⅲ_v), 145°; pyrocatecholate (Ⅲ_w), 121.5°; resorcinolate (Ⅲ_x), 143°; hydroquinolate (Ⅲ_y), 121.5°; pyrogallolate (Ⅲ_z), 140.5°. These salts were soluble in methanol, ethanol, chloroform or pyridine with different solubilities, and those sults, which contain organic anionic halves, were easily dissociated by treating their solutions in chloro- form with aqueous sodium chloride or dilute hydrochloric acid, and then the acids or phenols originally used could be recovered.The UV spectrum of the chloride (Ⅲ_c) shown in figure 1 possessed two maxima, i. e.,λ_(max) 265 (266) mμ, logε 4.51, and λ_(max). 313 mμ, logε 3.73, and seemed to be analogously related to that of 4, 4'-di-[dimethylamino]-diphenylmethane (Ⅰ), which had been reported by V. V. Perekalin et al. (1952).It was found that a solution of 10 γ/ml of the formate (Ⅲ_d) in water would inhibit the growth of B. Subtihs (Oxford Cup Test) with an inhibition diameter of 11.6 mm and 13 mm, while under the same conditions streptomycin would produce the same effect with only a concentration of 1 γ/ml.

(一)以4,4′-二-[二甲氨基]-二苯甲烷(Ⅰ)、硫酸亞碘酰(Ⅱ)及碘化鉀制成3,6-二-[二甲氨基]-二苯并碘六圜碘化物二氫碘酸鹽(Ⅲ_a·2HI),产率77%。 (二)碘化物二氫碘酸鹽(Ⅲ_a·2HI)以稀氫氧化鈉与三氯甲烷处理,得到碘化物(Ⅲ_a)。Ⅲ_a在其熔点温度热解,得到已知化合物——2,2′-二碘代-4,4′-二-[二甲氨基]-二苯甲烷(Ⅳ);并制备Ⅳ的苦味酸衍生物。 (三)碘化物(Ⅲ_a)的甲酸溶液以氧化銀处理,濾液經减压濃縮后,得到甲酸鹽(Ⅲ_d)。 (四)甲酸鹽(Ⅲ_d)的饱和乙醇溶液分别与若干种無机酸、鹽、有机酸及酚类化合物等作用,均得到相应的置換产物(Ⅲ)。所得到的有机酸鹽与酚鹽在温和的条件下,容易解离,而收回原用的有机酸或酚类化合物。甲酸鹽对枯草杆菌有抑制作用。 (五)氯化物(Ⅲ_c)的紫外吸收光譜(如圖1曲綫1),显示有兩个吸收峰。与4,4′-二-[二甲氨基]-二苯甲烷(Ⅰ)者相近似。

De brusques sursauts lumineux s'observent sur de nombreux types stellaires, notamment les naines rouges proches du Soleil (type UV Ceti) et les étoiles appartenant à une association (type T Tauri). On donne d'abord la liste de 20 étoiles UV Ceti certaines (tableau 1), puis on étudie les variations lumineuses: amplitude des sursauts, courbes de lumière (tableau 2); rapidité des flares, pouvant atteindre 0.25 mag/sec lors de la montée au maximum; fréquence des sursauts. On examine ensuite les variations...

De brusques sursauts lumineux s'observent sur de nombreux types stellaires, notamment les naines rouges proches du Soleil (type UV Ceti) et les étoiles appartenant à une association (type T Tauri). On donne d'abord la liste de 20 étoiles UV Ceti certaines (tableau 1), puis on étudie les variations lumineuses: amplitude des sursauts, courbes de lumière (tableau 2); rapidité des flares, pouvant atteindre 0.25 mag/sec lors de la montée au maximum; fréquence des sursauts. On examine ensuite les variations en dehors des flares (tableau 3). Le spectre présente toujours de l'émission (H et Ca Ⅱ); lors des sursauts on remarque le renforcement du fond continu et l'apparition de HeⅠ et HeⅡ, montrant une forte élévation de température, mais qui n'intéress qu'une petite portion de la surface de l'étoile (1 à 3%). Les UV Ceti sont des étoiles de très faible luminosité (M_(pg) 13) mais très nombreuses; elles appartiennent à la population Ⅰ. On rappelle ensuite la découverte des variations rapides de plusieurs étoiles du type RW Aurigae, et l'on examine les decouvertes d'étoiles à sursauts faites dans la zone du Taureau (tableau 5) la nébuleuse d'Orion (tableau 6) et NGC 2264 (tableau 7). On étudie ensuite les variations lumineuses, et surtout les relations existant entre les UV Ceti et les T Tauri: courbe de lumière, type spectral, appartenance à la population Ⅰ. On discute certains points (différences de luminosité absolue, de spectre, position sur le diagramme H-R). En conclusion les UV Ceti et les T Tauri forment un groupe; les différences observées entre les deux types ont sans doute pour origine a la fois la "sélection observationnelle" et une différence réelle dans le degré d'évolution des étoiles.

我们在有些恒星上观测到它们的光亮骤然发生变化,例如和太阳隣近的红矮星(鲸鱼UV型)和属於某一星協的星(金牛T型). 本文先列出20颗确定为鲸鱼UV型的星(表1),然後讨论它们的光变情况,如躍变的幅度,光变曲线(表2),闪光的速度(在上昇到极亮时,速度可达0.25星等/秒),躍变的频率等.跟着我们更讨论这些星不在闪光的时候的变化(表3). 这些星的光谱内常有发射线(H与CaⅡ),闪光的时候,光谱上的连续背景加强,并且出现HeⅠ和HeⅡ的谱线,表示温度增加很高,但是这仅限於星的很小的表皮层(1至3%). 鲸鱼UV型星自身亮度很弱(M_(pg)13),数目很多,属星族Ⅰ. 本文内提到几颗御夫RW型星的迅速变化,并且讨论了金牛区(表5),猎户星雲区(表6)和NGC2264里(表7)的闪光星. 我们研究了光变的情况,特别说明鲸鱼UV型星和金牛T型星之间的关系:例如在光曲线、光谱型和同属星族Ⅰ几个方面.我们也讨论了这两型星在绝对星等、光谱和赫-罗图上的位置三者的差异. 最後我们断定鲸鱼UV型星和金牛T型星实在是相同的一群;我们由观测得到的它们之间的差异,其原因一则由於“观测上的选择性”,再则由於这两型星的演化阶段有所不同...

我们在有些恒星上观测到它们的光亮骤然发生变化,例如和太阳隣近的红矮星(鲸鱼UV型)和属於某一星協的星(金牛T型). 本文先列出20颗确定为鲸鱼UV型的星(表1),然後讨论它们的光变情况,如躍变的幅度,光变曲线(表2),闪光的速度(在上昇到极亮时,速度可达0.25星等/秒),躍变的频率等.跟着我们更讨论这些星不在闪光的时候的变化(表3). 这些星的光谱内常有发射线(H与CaⅡ),闪光的时候,光谱上的连续背景加强,并且出现HeⅠ和HeⅡ的谱线,表示温度增加很高,但是这仅限於星的很小的表皮层(1至3%). 鲸鱼UV型星自身亮度很弱(M_(pg)13),数目很多,属星族Ⅰ. 本文内提到几颗御夫RW型星的迅速变化,并且讨论了金牛区(表5),猎户星雲区(表6)和NGC2264里(表7)的闪光星. 我们研究了光变的情况,特别说明鲸鱼UV型星和金牛T型星之间的关系:例如在光曲线、光谱型和同属星族Ⅰ几个方面.我们也讨论了这两型星在绝对星等、光谱和赫-罗图上的位置三者的差异. 最後我们断定鲸鱼UV型星和金牛T型星实在是相同的一群;我们由观测得到的它们之间的差异,其原因一则由於“观测上的选择性”,再则由於这两型星的演化阶段有所不同. 许多恒星的光亮表现突然的增加,或者说很迅速地发出“闪光”,在几分钟、有时在几秒钟内,星光有显著的增加,跟着变暗,初迅速而渐缓慢. 这种星光的躍变在许多型星都观测到,特别是在绝对亮度微弱的星上面.我们现在只讨论下列的主要两类恒星:

 
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