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排序方式: 共有152条查询结果,搜索用时 14 毫秒
61.
62.
A. S. Ahmad MD N. Hoda M. Ahmad F. Islam S. Z. Qureshi 《Journal of Analytical Chemistry》2006,61(9):870-874
A simple, sensitive, and selective kinetic spectrophotometric method for the determination of kanamycin in pure form and pharmaceutical
formulations is described. The method is based on the measurement of the intensity of the yellow chromogen formed by the reaction
between kanamycin and acetylacetone-formaldehyde reagent in a N,N′-dimethyl formamide medium. The variable-time method was used to evaluate the rate of reaction of the colored chromogen formed
at 410 nm. The reaction conditions were optimized and the calibration graph was found to be linear in the range 60–160 μg/mL.
The results obtained by the developed and reference methods are in good agreement. Various statistical parameters were evaluated
to establish the precision, accuracy, repeatability, and reproducibility of the proposed method.
The text was submitted by the authors in English. 相似文献
63.
Microwave propagation in two-dimensional dielectric lattices 总被引:1,自引:0,他引:1
McCall SL Platzman PM Dalichaouch R Smith D Schultz S 《Physical review letters》1991,67(15):2017-2020
64.
65.
Background
Hammerhead ribozymes are RNA-based molecules which bind and cleave other RNAs specifically. As such they have potential as laboratory reagents, diagnostics and therapeutics. Despite having been extensively studied for 15 years or so, their wide application is hampered by their instability in biological media, and by the poor translation of cleavage studies on short substrates to long RNA molecules. This work describes a systematic study aimed at addressing these two issues. 相似文献66.
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Molecular recognition in water is challenging but water-soluble molecularly imprinted nanoparticle (MINP) receptors were produced readily by double cross-linking of surfactant micelles in the presence of suitable template molecules. When the micellar surface was decorated with different polyhydroxylated ligands, significant interactions could be introduced between the surface ligands and the template. Flexible surface ligands worked better than rigid ones to interact with the polar moiety of the template, especially for those template molecules whose water-exposed surface is not properly solvated by water. The importance of these hydrophilic interactions was examined in the context of different substrates, density of the surface ligands, and surface-cross-linking density of the MINP. Together with the hydrophobic interactions in the core, the surface hydrophilic interactions can be used to enhance the binding of guest molecules in water. 相似文献
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McCall GH 《Physical review letters》1989,62(17):1986-1988