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吸收点
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  absorption point
     The component of the colorimetric-buffer solution and the effect of pH value are analyzed,and the equal absorption point of Al-Ferron and Fe-Ferron is determined as measuring the wavelength (362 nm).
     分析了该实验方法中比色 缓冲溶液的成分和 pH值的影响 ,确定以铝、铁与Ferron反应的等吸收点 36 2nm为测定波长 .
短句来源
     In HCl medium, the feasibility of simultaneous determination of p -nitrophenol, p -aminophenol and acetaminophen in the process of synthetic acetaminophen was discussed with equal absorption point and coefficient multiplying power method. The maximum absorption peak of p -nitrophenol is 318 nm; it′s linear range is 0~30 mg/L;
     探讨了在HCL体系中用双波长等吸收点分光光度法及系数倍率法同时测定对乙酰氨基酚合成过程中对硝基酚、对氧基酚和对乙酰氨酚三组分含量的可行性,对硝基酚的最大吸收为318nm,线性范围为0~30mg/L;
短句来源
     The Gel-phase background is eliminated by dualwavelength equal absorption point method (λ 1=804 nm,λ 2=420 nm). The sensitivity of solid-phase is seven times as highty as sensitivity of the corresponding solution method. It is applied to the determination of trance silicon in highly purity rare earth oxides.
     应用葡聚糖凝胶G-25从水溶液中吸附硅钼兰,应用双波长等吸收点法(λ1=804nm,λ2=420nm),消除凝胶相背景,固相灵敏度比相应的水溶液法灵敏度提高7倍,应用于高纯稀土氧化物中痕量硅的测定,取得满意结果
短句来源
     The content of KY 405 SBS plastic in which other compositions exist is determined by UV double wave length equivalent absorption point.
     采用紫外分光光度双波长等吸收点法对SBS塑料中的抗氧剂KY - 40 5含量进行了分析。
短句来源
     Determination of the point of intersection of absorption curves and the equal absorption point are unnecessary in this method, while the regression curves are of better stabilities.
     该法不需要吸收曲线交点和等吸收点 ,具有较好的回归稳定性。
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  absorbance point
     Simultaneous Determination of Platinum and Palladium in Ores by Dual-Wavelength Equioalent Absorbance Point Spectrophotometry
     双波长等吸收点光度法同时测定矿石中铂和钯
短句来源
     At the same time,it also collects some representative works published at the home and foreign literature at the end of the 1980s including new methods and reagents,dual-wavelength spectrophptometry(equivalent absorbance point,k-factor and two times methods),multiorder derivative spectrophotometry and other combined techniques,with 67 references.
     同时 ,收入了部分上世纪 80年代末期国内外具有代表性的论著。 内容包括 :新方法与新试剂、双波长分光光度法 (等吸收点和系数倍率法、二次双波长法 )、多阶导数分光光度法和其它技术联用法。
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  “吸收点”译为未确定词的双语例句
     For Pd the selected reference wavelength λ1 is 776. 6nm, and the measurement wavelength λ2 is 638. 0 nm.
     选择参比波长λ_1=776.6nm,测定波长λ_2=638.0nm,双波长等吸收点光度法测定Pd;
短句来源
     Two wavelengths at identical absorption points of vanadium, 593nm and 617 nm have been selected as the measuring wavelengths.
     选择钒等吸收点波长593nm、617nm为测定波长。
短句来源
     the wavelengths at isoabsorptive points of aspirin are 243.5 nm and 283.5 nm and they were accurately selected as the measuring wavelengths for paracetamol.
     同样,选择乙酰水杨酸的等吸收点波长243.5nm,283.5nm为对乙酰氨基酚的测定波长.
短句来源
     On the basis of studying the ultraviolet absorption spectra of nitrate and nitrite, the wavelengths at isoabsorptive points of nitrite, 202. 5nm and 216- 5nm, were accurately selected as the measuring wavelengths.
     在研究硝酸盐和亚硝酸盐紫外光谱的基础上,精确选择亚硝酸盐等吸收点波长202.5nm,216.5nm为测定波长.
短句来源
     The isosbestic point double-wavelength UV spectrophotometry for the determination of Aniline and p-Aminophenol has been described. The determination wavelengths were 261.6 and 282 nm. The relative standard deviation of Aniline and p-Aminophenol is 0.93% and 0.71%.
     选择261.6 nm和282 nm为测定波长,用等吸收点双波长紫外分光光度法,对硝基苯直接电还原合成对氨基苯酚反应液中的对氨基苯酚和苯胺进行了定量分析,对氨基苯酚和苯胺测定结果的平均相对标准偏差分别为0.71%和0.93%;
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  absorption point
The results of measuring the optical absorption point to the formation of β-FeSi2 layers and precipitates with a direct-gap structure, an optical gap of Eg≈0.83 eV, and an Urbach tail extent of E0≈220 meV.
      
The wavelength recommended by the author for measuring is 477 nm because the iso-absorption point of the principal pigment components occurs at this wavelength.
      
[14C]-MBOCA was absorbed by cabbage (Brassica oleracea L.), bean (Phaseoh's vulgaris L.), and sugar beet (Beta vulgaris L.) leaves, but did not move beyond the absorption point.
      
The wavelength to detect the DM was 254 nm, which was the peak absorption point of DM on the prelim inary test.
      
The black cross refers to the barycentre while the white cross indicates the reconstructed absorption point.
      
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  absorbing point
Doses were then estimated by a crude non-absorbing point source approximation and by using experimental dose rates.
      


Based upon the characteristic reaction of S-RNA with FDNB which resulted in the attachment of the DNP-group only on the 5'-phosphomonoester end group of S-RNA, this report described experiments which utilized the DNP-group as label for the identification of the terminal nucleotides and their adjacent nucleotide sequences.Both the labeled (DNP-S-RNA) and the ordinary S-RNA were digested with pancreatic ribonuclease, and the resulting products were separated by Rushizky and Knight's paper electrophoresis-chromatography...

Based upon the characteristic reaction of S-RNA with FDNB which resulted in the attachment of the DNP-group only on the 5'-phosphomonoester end group of S-RNA, this report described experiments which utilized the DNP-group as label for the identification of the terminal nucleotides and their adjacent nucleotide sequences.Both the labeled (DNP-S-RNA) and the ordinary S-RNA were digested with pancreatic ribonuclease, and the resulting products were separated by Rushizky and Knight's paper electrophoresis-chromatography mapping procedure. The substances in the major spots of the map so obtained were identified and estimated by spectrophotometry after elution. Results showed no significant differences in the electrophoretic and chromatographic behaviours between DNP-S-RNA and S-RNA. The terminal oligonucleotides labeled with DNP-group (DNP-oligonucleotides) overlapped with the correspondent oligonucleotides on the map. Identification of the DNP of ultraviolet absorption spots were made by spectrophotometry at 350-370mμ after degradation of the eluate with alkali. The results showed that the terminal nucleotides of 5'-phosphomonoester of E. coli S-RNA were pGp···, pAp···pCp···and trace amounts of pUp···.The sequence adjacent to the pXp seemed to differ for different specific S-RNA. Some of them were found to be pGpUp···, pGpCp···, (pGpAp) Op···, (pGpGpAp) Up···,pApCp···, pApUp··· and pGpGpUp··· and/or(pGpAp) Up···.The oligonucleotides consisting of 4 or more nucleotides were not determined.DNP was left in the original spot of the map, indicating the presence of terminal fragments probably made up of more than four purine nucleotides, and analyses of the spot showed that guanylic acid dominated.

(1)比较了E.coli DNP-S-RNA和S-RNA的紫外光谱,并研究了DNP-S-RNA的RNase I的降解条件,结果表明两者无显著差别。(2)对DNP-S-RNA的RNase I降解产物的双向电泳层析图谱进行了分析,并与S-RNA图谱进行了比较,两者图谱中光吸收点的分布一致,相应点经洗脱后,由光谱分析与核碱组成测定证明均含有相同的核苷酸组成。(3)在DNP-S-RNA和S-RNA于同一条件下得到的图谱中,前者的某些光吸收点中含有不同量的DNP-。根据DNP-可以标记S-RNA末端5′-磷酸单酯,分析了DNP-结合物,说明在E.coli S-RNA分子中,B末端核苷酸除pGp…以外,尚有pAp…,pCp…以及痕量的pUp…。和末端相邻的核苷酸排列形式,随特异S-RNA而有不同,有pGpUp…,pGpCp…,p(GpGpAp)Up…,p(GpAp)Up…+pGpGpUp…,p(GpAp)Cp…,pApUp…和pApCp…。其他四核苷酸以上多核苷酸未分析。由于电泳和层析后原点部分标记了DNP-,估计末端核苷酸排列有五、六核苷酸以上的多嘌呤核苷酸的排列形式,其中以G为主。

(1) Ribonuclease T_1 was purified 2800 fold from Taka-Diastase by a simple method, including phenol extraction and column chromatography on DEAE-cellulose and calcium phosphate. RNase with the same purity and specificity was also prepared from Aspergillus oryzae koji obtained from Shanghai Szu Wan Soy Sauce Factory.(2) By the action of RNase T_1 alone or together with RNase I, it was found that the structure of sRNA from the silkgland of Attacus ricini was markedly different from that of sRNA from the brewer's...

(1) Ribonuclease T_1 was purified 2800 fold from Taka-Diastase by a simple method, including phenol extraction and column chromatography on DEAE-cellulose and calcium phosphate. RNase with the same purity and specificity was also prepared from Aspergillus oryzae koji obtained from Shanghai Szu Wan Soy Sauce Factory.(2) By the action of RNase T_1 alone or together with RNase I, it was found that the structure of sRNA from the silkgland of Attacus ricini was markedly different from that of sRNA from the brewer's yeast. When RNase T_1 was used alone, more Gp and less UpUpGp were obtained from the silkgland sRNA than from the yeast sRNA. However, the combined action of RNase T_1 and RNase Ⅰ released more Cp and (Gp!+Gp) in the former RNA. Moreover, the sRNA of Attacus ricini contained more unusual oligonucleotides. Some of them gave strong fluorescence at pH around 4.5 under the ultraviolet light.(3) There were -Gp (Ap)_3Cp-and-Gp(Ap)_4CP-sequences in the silkgland sRNA of Attacus ricini.(4) The ratio of Gp!/Gp obtained after combined digestion of sRNA with RNase T_1 and RNase Ⅰ was higer than with RNase T_1 alone.

(1) 从高峰淀粉酶制剂(Taka-Diastase)制得RNase T_1,提纯了2800倍,可用于结构研究,从上海四万酿造厂的米麯也分得类似纯度、类似特异性的酶。(2) 用RNase T_1单独或与RNaseⅠ联合作用的结果,均发现啤酒酵母与蓖麻蚕絲腺腺体sRNA的结构有显著差异。例如用RNase T_1单独作用时,由蓖麻蚕蒜腺sRNA所得Gp大于啤酒酵母sRNA,而UpUpGp则小于后者。用两个酶联合作用时,由蓖麻蚕絲腺sRNA所得Cp、(Gp+Gp!)大于啤酒酵母sRNA,且前者较后者多出许多含稀有成份的紫外光吸收点,其电泳层析行为及表现熒光性质较为特殊。(3) 蓖麻蚕蒜腺sRNA合有-Gp(Ap)_4Cp-及-Gp(Ap)_3Cp-等结构。(4) RNase Ⅰ与RNase T_1联合水解sRNA所得Gp!/Gp值大于RNase T_1单独作用时所得Gp!/Gp值。

Sulfamethoxypyrazine (SMPZ) and trimethroprim (TMP) in sulfamethoxy- pyrazine compound tablets were determined with three wavelength spectrophoto- metry without any preliminatry separation. The compound tablets were ground and dild. with 0.1 N HCl at 70℃, and analyzed with 751 G spectrophotometer at 229nm,304 nm. Recoveries were 99.65±0.31% and 98.73±0.31% respectively.

本文采用三波长分光光度法不经分离直接测定复方磺胺甲氧吡嗪片中磺胺甲氧吡嗪(SMPZ)和甲氧苄氨嘧啶(TMP)的含量。精密称取适量样品,加0.1N HCl振摇,加热,冷却,过滤,取续滤液在精选波长229nm、304nm处测定。SMPZ的平均回收率为99.6±0.29%,TMP的平均回收率为98.7±0.28%。与双波长法、正交函数法相比,本法对复方磺胺甲氧吡嗪片测定的准确度和精密度并无显著性差别。在干扰组分光谱无适当的等吸收点的情况下,应用本法可解决双波长法无法解决的二组分混合物的测定。

 
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