F. Ponce, Y. Mirabal-Gallardo, A. Versari, and V.F. Laurie. 2018. The use of cation exchange resins in wines: Effects on pH, tartrate stability, and metal content. Cien. Inv. Agr. 45(1): 82-92. Treating wines with cation exchange resins allows the reduction of pH and contributes to limiting the formation of tartrate salts by exchanging cations such as potassium with hydrogen ions. This manuscript summarizes the results of a series of laboratory and winery-scale trials performed with the aim of evaluating the ion exchange process and its effects on the chemical composition of the treated samples. The laboratory-scale results showed that both the procedure employed for the activation of resins and the chemical composition of the wines affected the extent of the chemical changes occurring during the treatment. As such, the winery-scale trials showed that the resin-treated wines have significantly lower pH, higher total acidity, less tartrate formation (measured by weight), and a reduced amount of most metals analyzed. Wine samples blended with approximately 20% of cation exchange-treated samples (by volume) showed no signs of tartrate instability when assessed by a quick qualitative cold test.
El propósito de esta investigación fue analizar la efectividad de un programa de intervención, basado en psicología positiva y habilidades sociales, para mejorar la satisfacción vital y la satisfacción laboral de trabajadores pertenecientes a una organización del sector público. Para analizar la efectividad del programa de intervención se utilizó un diseño cuasi-experimental con un grupo control inactivo. La intervención se aplicó en una muestra de supervisores inmediatos de una organización pública del sector salud. Los grupos fueron conformados por la unidad de recursos humanos de la organización, atendiendo a las necesidades de ésta. El grupo experimental estuvo conformado por siete supervisores directos, mientras que el grupo control estuvo conformado por ocho supervisores. La efectividad del programa de intervención se evaluó tanto en los subordinados directos (N=41) de los supervisores que conformaron el grupo experimental, como en los subordinados de los supervisores pertenecientes al grupo control (N=36). El programa duró aproximadamente un mes y tres semanas. El análisis de datos evidenció
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