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991.
992.
A hydrophilic interaction liquid chromatographic method with tandem mass spectrometry for the determination of atenolol, a beta-blocking agent, in human plasma has been developed and validated over the curve range of 10--2000 ng/mL. The assay was based on protein precipitation followed by evaporation of the extraction solvent, reconstitution with acetonitrile, and chromatography on an Hypersil silica column (50 x 4.6 mm) using a low aqueous--high organic mobile phase. The mobile phase consists of 85% acetonitrile, 15% water, 0.5% acetic acid and 0.04% trifluoroacetic acid and runs isocratically at a flow rate of 2.0 mL/min. The column ef fluent was split so that 50% of it was transferred into the LC-MS/MS interface operated in positive electrospray ionization mode. The chromatographic run time was 2.0 min per injection. Atenolol and the internal standard, atenolol-d(7), showed a retention time of 1.0 min. The inter-day and intra-day precision and accuracy of the quality control samples were <5.3% relative standard deviation and <8.0% relative error, respectively. To explore the application of the current method for the analysis of other beta-blocking agents, propranolol and metoprolol were tested under the same chromatographic conditions with retention times of 0.68 and 0.75 min, respectively. The present method could be used for therapeutic drug monitoring, pharmacokinetic and drug--drug interaction studies of beta-blocking agents. 相似文献
993.
Background levels of platinum were determined in human autopsy tissues taken from five individuals. The investigated specimens were lung, liver and kidney. Sample preparation involved microwave digestion followed by an open vessel treatment. Inductively-coupled plasma sector field mass spectrometry (ICP-SFMS) was applied in combination with an ultrasonic nebulization/membrane desolvation system for sample introduction. Isotope dilution analysis was employed for accurate quantification of platinum. Excellent procedural detection limits (3 s validation) of 20, 20 and 34 pg g–1 dry weight were obtained for lung, liver and kidney tissue, respectively. Due to the lack of appropriate biological reference material, road dust (BCR-723) was used for method validation. Platinum levels ranging between 0.03 and 1.42 ng g–1 were determined in the investigated samples. The platinum concentrations observed in human lung tissue may reflect the increasing atmospheric background levels of platinum originating from car catalysts. The presence of platinum in kidney and liver tissue samples clearly indicates the bioavailability of the element. 相似文献
994.
995.
Shizhi Li Wu Huang Hongshun Yang Zhongshu Wang 《Plasma Chemistry and Plasma Processing》1984,4(3):147-161
Experiments indicate that the temperature in chemical vapor deposition (CVD) of TiN can be decreased from about 1000°C in
conventional CVD to about 500°C by the application of a D.C. nonequilibrium plasma. The hardness of the TiN film is greater
than 2000 kg/mm2 (Vickers). The effect of pressure, ratio of gas mixture, and discharge parameters on the film deposition rate, its hardness,
and microstructures has been studied. 相似文献
996.
Study of transport in the boundary layer of tokamak plasma in presence of magnetic divertors is extended to the second order
in ion collision frequency. Numerical results for ion and energy losses to the collector plates are presented for toroidal
and poloidal divertors. For the toroidal case, the Wiener-Hopf solution for the second order distribution function is obtained.
An error occurring in an earlier first order calculation is pointed out and corrected first order fluxes are also given. For
the poloidal divertor, asymmetry observed in ion and energy transport is found to persist in the second order result. 相似文献
997.
分析了电子束入射托卡马克等离子体表面后所发生的一系列物理过程,特别是电子束注入等离子体后在边界层形成平行电流和径向负电场,使等离子体由低约束模式向高约束模式,即L H模式转换中的作用。论证了当注入电子束的密度超过一定的阀值时,L H 模转换被触发。 相似文献
998.
本文用傅里叶及边缘泰勒展开的方法,导出了非圆截面托卡马克等离子体边缘磁面的解析解及其重构的方法。最后作为例子,给出了在TEXT-U装置中按实际参数重构的等离子体边缘磁面结构及重构的误差。 相似文献
999.
T. Okada S. Inoue T. Ohga K. Muraoka M. Akazaki 《International Journal of Infrared and Millimeter Waves》1985,6(9):883-892
A D2O laser has been developed for collective Thomson scattering measurements of ion temperature in high temperature plasmas. A pulse duration and a spectral width of a high power D2O laser has been successfully controlled for this purpose, by using a TEA CO2 laser injection-locked by an etalon-tuned TEA CO2 laser as a pump source. 相似文献
1000.
陆全康 《核聚变与等离子体物理》1985,(4)
本文给出非理想流体(非理想气体、等离子体及液体)的对偶关联性质的一般理论。文中给出了计算多组元、任意分子相互作用势体系的对偶关联函数的一般公式,以及由辐射(激光与微波)散射测定分子间相互作用势与对偶密度关联函数的理论基础。 相似文献