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- Author or Editor: W. Tu x
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Abstract
A routine procedure for monostandard INAA using short-lived radionuclides with half-lives from 2 min to 15 hrs is described. Ten elements (Al, Mg, Ti, V, Mn, Cl, Na, K. Br and Cu) are determined in Chinese Biological Standard Reference Material (peach leaves). The quality of analysis was checked by analyzing the U. S. NBS Standard Reference Materials SRM-1571 and SRM-1648.
Abstract
Instrumental neutron activation analysis (INAA) has been applied for the simultaneous determination of up to 33 elements including major, minor and trace elements in the environmental reference materials soil and coal fly ash from China. The procedure involves both short and long irradiations followed by the measurement of the gamma spectra with a Ge(Li) detector. The analytical results are presented and discussed.
Isospora michaelbakeri is one of the Isospora species most commonly found in the wild field, which can cause severe infection and mortality in young sparrows. In this study, we selected I. michaelbakeri (Chung Hsing strain) as a pathogen to orally inoculate russet sparrows ( Passer rutilans ), spotted munia ( Lonchura punctulata ), canary ( Serinus canaria ), Java sparrows ( Padda oryzivora ), chicken ( Gallus domesticus ), ducks ( Anas platyrhynchos ) and BALB/c mice. The results indicated that I. michaelbakeri infected only russet sparrows. Infected sparrows displayed lethargy, muscular weakness and fluffy feathers, followed by rapid death. Liver and spleen enlargement was seen in the infected birds. Schizonts were identified in thin smears from the venous blood, enlarged livers and spleens. Histopathological examination revealed schizonts and merozoites from the liver and spleen of infected russet sparrows, but not from other species experimentally inoculated with I. michaelbakeri in the present study.
Abstract
We report herein a high-throughput integrated ynthesis–purification platform termed SWIFT (synthesis with integrated-flow technology) and processes that accelerate the rate at which validated small-molecule organic compounds are generated. A segmented-flow synthesizer was integrated to a preparative HPLC-MS, where each reaction product was purified immediately upon reaction completion. Further, automated structure-validation processes accelerate the rate at which drug discovery candidates are available for biological screening.
