This study focuses on the oxidative stress in patients with severe chronic renal failure who are not undergoing dialysis treatment. The erythocyte levels, creatinine clearing and plasma- and cell activities of the following enzymes were determined: glutathione peroxidase (Gpx), superoxide dismutase (SOD), catalase (CAT), glutathione reductase (GR), and glutathione transferase (GT). The concentrations of non-enzyme molecules such as total glutathione in both oxidized and reduced forms, and malonyldialdehyde (MDA) were also measured. The obtained values were compared with those in healthy blood donors of comparable age and social status. The results indicate that chronic renal patients have lower glutathione levels and reduced activities of glutathione peroxidase and of glutathione reductase, while exhibiting elevated levels of malonyldialdehyde and activities of superoxide dismutase, glutathione transferase, and catalase. Finally, creatinine clearing was found to be correlated (p < 0.001) to total (oxidized and reduced) glutathione, Gpx and MDA. These observations may serve to establish a simple protocol for evaluation of renal function.
Las simulaciones de barridos de parámetros tienen un gran potencial en el estudio de redes telemáticas, especialmente en contextos docentes. Sin embargo, el elevado tiempo necesario habitualmente para completar este tipo de simulaciones es una limitación importante para su uso. En este artículo se propone DNSE3, un entorno que permite la ejecución distribuida de tareas de simulación en el simulador ns-3 dentro de un entorno de nube computacional, a través de una arquitectura de servicios RESTful. El sistema se ha diseñado para ser autoescalable, aprovisionando y liberando dinámicamente recursos de la nube computacional en función de la carga de simulaciones demandada, y garantizando un reparto equitativo de los recursos entre los distintos usuarios. Además, DNSE3 se ha implementado reutilizando servicios presentes en \emph{middlewares} de nube populares, y ha sido evaluado mediante pruebas sintéticas. La implementación de DNSE3 ha demostrando un correcto comportamiento funcional y un rendimiento considerablemente superior a otras alternativas cuando el número de simulaciones es muy elevado.
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