Estudio de una técnica que aplica la espectrometría de rayos X al análisis de aleaciones de estaño-plomo

Se describe una nueva técnica para el análisis de aleaciones binarias por fluorescencia de Rayos X, estudiada en principio para el sistema estaño-plomo. Mediante el uso de la relación de intensidades de los elementos intervinientes se independiza la determinación de la superficie. Ello permite el análisis directamente sobre virutas. Se compara esta técnica con la que utiliza placas pulidas. Se ha encontrado que los parámetros de dispersión, mediante el método descripto, son menores que los obtenidos por el método tradicional (debido a la segregación producida).A new technique for the analysis of binary alloys by means of X-ray fluorescence is described, as applied to the system tin-lead. Surface determination is avoided making use of intensities ratio of intervening elements. This allows the direct analysis of turnings. The technique is compared with that using po1ishedplates. It has been found that dispersion parameters, on using the method described, are lower than those obtained with the conventional method; this is attributed to segregation

Transfusion-related acute lung injury (TRALI): Current concepts and misconceptions

Transfusion-related acute lung injury (TRALI) is the most common cause of serious morbidity and mortality due to hemotherapy. Although the pathogenesis has been related to the infusion of donor antibodies into the recipient, antibody negative TRALI has been reported. Changes in transfusion practices, especially the use of male-only plasma, have decreased the number of antibody-mediated cases and deaths; however, TRALI still occurs. The neutrophil appears to be the effector cell in TRALI and the pathophysiology is centered on neutrophil-mediated endothelial cell cytotoxicity resulting in capillary leak and ALI. This review will detail the pathophysiology of TRALI including recent pre-clinical data, provide insight into newer areas of research, and critically assess current practices to decrease it prevalence and to make transfusion safer