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排序方式: 共有162条查询结果,搜索用时 15 毫秒
1.
C. A. Beattie M. B. Boisen Jr. L. W. Johnson 《Journal of Optimization Theory and Applications》1991,68(1):203-203
Corrections to the last two equations of Ref. 1 are given. 相似文献
2.
3.
Beattie JH Reid MD Harvey LJ Dainty JR Majsak-Newman G Fairweather-Tait SJ 《The Analyst》2001,126(12):2225-2229
Measuring mineral absorption by fecal monitoring is labor-intensive and relies on good volunteer compliance. Blood indicators of absorption could be advantageous and we have developed a method for selective extraction-of recently absorbed (exchangeable) copper based on dialysis of plasma with histidine and subsequent copper extraction using Chelex resin. The potential for measuring copper absorption by transient enrichment of exchangeable copper with the stable isotope 65Cu from an ingested tracer, was also investigated. This method was compared with that of the fecal monitoring technique in a human volunteer, who consumed a 6 mg dose of 65Cu with inhibitors of copper absorption. Holmium was used as a non-absorbable rare-earth marker of unabsorbed tracer excretion, allowing estimation of re-secreted 65Cu (44 microg d(-1)), and hence calculation of true tracer absorption, which was only 10.8%. Monitoring plasma tracer kinetics showed potential for estimation of copper absorption without the need for fecal copper analysis. 相似文献
4.
The volatile products of thermal degradation of poly(tetramethyl-p-silphenylene siloxane) and a series of copolymers with dimethylsiloxane have been separated and identified using principally gas chromatography-mass spectroscopy (GC-MS). The effect of temperature of degradation and copolymer composition on the pattern of products has been demonstrated. As the proportion of dimethylsiloxane structures in the copolymers is increased, the predominantly linear products give way to cyclics. 相似文献
5.
A combination of thermospray liquid chromatography-mass spectrometry (LC-MS) and LC MS MS has allowed the structural elucidation of a number of metabolites of 4-[2-(dipropylamino)ethyl]-1,3-dihydro-2H-indol-2-one (SK & F 101468) in monkey urine. By using LC-MS-MS with the third quadrupole (Q3) set up in multiple ion detection (MID) mode, a number of metabolites were subsequently detected in the human urine and plasma samples despite very low dosing regimes. This was achieved with minimal sample preparation, e.g. for the urine sample centrifugation was the only preparative step, in order to remove particulate matter, prior to analysis. The good signal-to-noise ratio obtained for the human samples, using LC MS MS with Q3 set up for MID, raised the possibility of a LC-MS-MS quantitative assay. As a result, the detection limit of this method for SK&F 101468 when dissolved in methanol was determined to be in the region of 20 pg on column. 相似文献
6.
A method based on dialysis in the presence of histidine, and subsequent copper adsorption and preconcentration using Chelex-100 resin, has been developed for selective extraction of exchangeable copper from blood plasma. The method was verified by comparative analysis using two different instrumental techniques, ICP–MS and AAS. The results obtained were in excellent agreement. Accurate quantification of the exchangeable copper and the firmly bound copper was achieved. The method was further validated by analysis of a lyophilised human serum certified reference material. 相似文献
7.
Beattie JK Djerdjev AM Franks GV Warr GG 《The journal of physical chemistry. B》2005,109(33):15675-15676
Homogenization of hexadecane in water at pH 9 gives the same surface charge density in the presence of 0.2 mM thiocyanate or acetate anions as in the presence of chloride, indicating that these dipolar anions are not preferentially adsorbed at the oil/water interface. The decrease in the zeta potential of the emulsion droplets as the sodium salts of iodate, thiocyanate, or acetate are added from 0.1 to 10 mM is the same as that when sodium chloride is added, leading to the same conclusion. Increasing the sodium hydroxide concentration from pH 9 to 11.5 has a different effect on the zeta potential, consistent with the specific adsorption of hydroxide ion at the oil/water interface. 相似文献
8.
Fluorine at 1–5 torr pressure was dissociated with a microwave discharge and passed over samples of UO2 or U3O8. The only reaction products were UF6 and O2. The reaction rates were independent of particle size and sample depth, but depended upon the geometric surface of the sample. Kinetic studies were interpreted to show that F-atoms react immediately upon contact with the surface, and that both F2-molecules and F-atoms react with the sample. When the ratio, F/F2, is relatively low, the partial pressure of F-atoms is rate determining. When the ratio, F/F2, is relatively high the rate of diffusion of total fluorine (F+F2) to the surface is rate determining. 相似文献
9.
10.
Tiyaporn Luangpipat Isabel R. Beattie Yusuf Chisti Richard G. Haverkamp 《Journal of nanoparticle research》2011,13(12):6439-6445
An efficient biological route to production of gold nanoparticles which allows the nanoparticles to be easily recovered remains
elusive. Live cells of the green microalga Chlorella vulgaris were incubated with a solution of gold chloride and harvested by centrifugation. Nanoparticles inside intact cells were identified
by transmission electron microscopy and confirmed to be metallic gold by synchrotron based X-ray powder diffraction and X-ray
absorption spectroscopy. These intracellular gold nanoparticles were 40–60 nm in diameter. At a concentration of 1.4% Au in
the alga, a better than 97% recovery of the gold from solution was achieved. A maximum of 4.2% Au in the alga was obtained.
Exposure of C. vulgaris to solutions containing dissolved salts of palladium, ruthenium, and rhodium also resulted in the production of the corresponding
nanoparticles within the cells. These were surmised to be also metallic, but were produced at a much lower intracellular concentration
than achieved with gold. Iridium was apparently toxic to the alga. No nanoparticles were observed using platinum solutions.
C. vulgaris provides a possible route to large scale production of gold nanoparticles. 相似文献