Ruthenium(III) Catalyzed Oxidation Of Ethylenediaminetetraacetic Acid By N-Bromosuccinimide In Aqueous Alkaline Medium – A Kinetic And Mechanistic Study

The formation mechanism of microheterogeneous hydrogenation catalysts based on phosphinepalladium (II) complexes has been considered. According to elemental analysis, X-ray diffraction, electron microscopy, NMR, and IR spectroscopy, the catalyst is a nanoscale palladium organophosphorus matrix and (or) palladium phosphide with immobilized palladium clusters. This revised version was published online in June 2006 with corrections to the Cover Date.     

Optimization and Validation of an LC Method for the Determination of Cefdinir in Dosage Form and Human Urine

A simple and reliable liquid chromatographic method has been developed and validated for the determination of cefdinir in human urine and capsule samples. A chromatographic separation was achieved on a C₁₈ column using a mobile phase consisting of potassium dihydrogen phosphate (10 mM, pH 4.5)–acetonitrile (90:10, v/v). Quantitation was achieved with UV detection at 285 nm, based on peak area with linear calibration curve at a concentration range of 0.7–39 µg mL⁻¹. This method was successfully applied for the establishment of an urinary excretion pattern after oral dose.

     

An improved method for the synthesis of nucleoside triphosphate analogues

[reaction: see text] Nucleoside monophosphates, when activated by trifluoroacetic anhydride and N-methylimidazole, efficiently couple with a variety of electron-deficient diphosphonates in a reproducible and efficient manner (<2 h, >72% isolated yield). Unlike traditional methods for the preparation of nucleoside 5'-beta,gamma-methylenetriphosphate analogues, there is no requirement for predrying, or conversion to specific salt forms, of commercially available nucleoside monophosphate starting materials.     

Sharp Large Deviation Estimates for the Stochastic Heat Equation

We consider the family {X , 0} of solution to the heat equation on [0,T]×[0,1] perturbed by a small space-time white noise, that is _t X = X +b({X })+({X }) . Then, for a large class of Borelian subsets of the continuous functions on [0,T]×[0,1], we get an asymptotic expansion of P({X }A) as 0. This kind of expansion has been handled for several stochastic systems, ranging from Wiener integrals to diffusion processes.     

The p-Spin Interaction Model with External Field

This paper is devoted to a detailed study of a p-spins interaction model with external field, including some sharp bounds on the speed of self averaging of the overlap as well as a central limit theorem for its fluctuations, the thermodynamical limit for the free energy and the definition of an Almeida–Thouless type line. Those results show that the external field dominates the tendency to disorder induced by the increasing level of interaction between spins, and our system will share many of its features with the SK model, which is certainly not the case when the external magnetic field vanishes.     

Quasilinear Stochastic Hyperbolic Differential Equations with Nondecreasing Coefficient

In this note we prove a result of existence and uniqueness of solutions for a certain class of hyperbolic stochastic differential equations with additive white noise and nondecreasing coefficient. We then show the convergence of Euler's approximation scheme for this equation.