排序方式: 共有14条查询结果,搜索用时 328 毫秒
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P. S. Suresh Sanjeev Giri Raghib Husain Ramesh Mullangi 《Biomedical chromatography : BMC》2010,24(10):1052-1058
A highly sensitive, rapid assay method has been developed and validated for the estimation of S‐citalopram (S‐CPM) in rat plasma with liquid chromatography coupled to tandem mass spectrometry with electrospray ionization in the positive‐ion mode. The assay procedure involves a simple liquid–liquid extraction of S‐CPM and phenacetin (internal standard, IS) from rat plasma with t‐butyl methyl ether. Chromatographic separation was operated with 0.2% formic acid:acetonitrile (20:80, v/v) at a flow rate of 0.50 mL/min on a Symmetry Shield RP18 column with a total run time of 3.0 min. The MS/MS ion transitions monitored were 325.26 → 109.10 for S‐CPM and 180.10 → 110.10 for IS. Method validation and pre‐clinical sample analysis were performed as per FDA guidelines and the results met the acceptance criteria. The lower limit of quantitation achieved was 0.5 ng/mL and the linearity was observed from 0.5 to 5000 ng/mL. The intra‐ and inter‐day precisions were in the range of 1.14–5.56 and 0.25–12.3%, respectively. This novel method has been applied to a pharmacokinetic study and to estimate brain‐to‐plasma ratio of S‐CPM in rats. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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Raghib Abu-Saris Mowaffaq Hajja 《Journal of Mathematical Analysis and Applications》2006,322(2):729-734
In this research, we investigate Gauss compounding of time-variant (nonautonomous) symmetric weighted arithmetic means. We establish the existence of the compounded mean under an easy-to-apply criterion. Also, we investigate the properties that are enjoyed by the compounded mean. 相似文献
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R. Abu-Saris K. Al-Dosary Q. Al-Hassan 《Journal of Difference Equations and Applications》2013,19(10):869-877
We consider difference equations of order k n+k ≥ 2 of the form: yn+k = f(yn,…,yn+k-1), n= 0,1,2,… where f: D k → D is a continuous function, and D?R. We develop a necessary and sufficient condition for the existence of a symmetric invariant I(x 1,…,xk ) ∈C∞[Dk,D]. This condition will be used to construct invariants for linear and rational difference equations. Also, we investigate the transformation of invariants under invertible maps. We generalize and extend several results that have been obtained recently. 相似文献
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Raghib Abu-Saris 《Journal of Mathematical Analysis and Applications》2003,280(1):148-154
We investigate the asymptotic behavior of solutions of a separable difference equation of the form
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Raghib M. Abu-Saris Félix Martínez-Giménez Alfredo Peris 《Nonlinear Analysis: Theory, Methods & Applications》2008
We present counterexamples which show that the uniform limit of topologically transitive maps on a compact metric space is not necessarily topologically transitive. We also give stronger conditions that ensure the inheritance of topological transitivity for the case of uniform convergence and other situations. 相似文献
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Raghib M Abu-Saris Qassem M Al-Hassan 《Journal of Mathematical Analysis and Applications》2003,283(2):468-477
In this research, we consider a difference equation of order k?2 of the following form: