In the following study, the simulation of the polymeric-grade acrylic acid (AA) production process is carried out using the simulator ChemCAD ® version 5.2.0., in order to obtain mass balance results in all the process streams and also to know the most important design parameters of the equipment used. Two sensitivity studies were carried out: 1) influence of the absorption tower operating temperature in the amount of AA obtained at the bottom column; and 2) influence of the recovery column working pressure in the amount of acetic acid obtained on it. At the recovery column a liquid bottom stream containing AA with 99.90 % purity is obtained, while in the acids column the AA is obtained with 99.86 % purity at the bottom stream. It's recommended that the absorption tower operates at a temperature near 20 °C, while the recovery column must run under vacuum conditions, in order to reduce both the AA and acetic acid losses.
Dengue fever (DF) and dengue hemorrhagic fever/dengue shock syndrome (DHF/DSS) are considered the most important arthropod-borne viral diseases in terms of morbidity and mortality. The emergency and severity of dengue (Den) infections increase the necessity of an early, quick and effective dengue laboratory diagnostic. Viral isolation is considered a gold standard for diagnosis of dengue infection using monoclonal antibodies (mAbs) as a tool for determining serotype specificity. Alternatives have been used to improve sensitivity and time to dengue diagnosis. Based on the early expression of dengue C protein in the life cycle, we focused our study on the application of an anti-dengue 2 virus capsid protein mAb in dengue diagnosis. The kinetic expression of dengue-2 capsid in mosquito cells and its immuno-localization in experimentally infected suckling albin Swiss (OF-1) mice brain tissues was established. The results demonstrate the possible utility of this mAb in early dengue diagnosis versus traditional isolation. In addition, a preliminary study of an enzyme immunoassay method using 8H8 mAb for specific detection of dengue C protein antigen was performed, making possible recombinant C protein quantification. The results suggest that detection of dengue capsid protein could be useful in the diagnosis of early dengue infection.
En este artículo se describe el proceso de investigación-acción llevado a cabo para la redefinición y el diseño de un programa destinado a niños, niñas y adolescentes con dificultades y/o situaciones conflictivas en el ámbito familiar. El diseño del nuevo programa NAYFA se ha realizado siguiendo los estándares de calidad de los programas basados en la evidencia y mediante un proceso colaborativo entre responsables políticos, profesionales e investigadores. Se utilizó la técnica DAFO para identificar las principales fortalezas y debilidades de las actuaciones previas desarrolladas en diferentes provincias andaluzas. Los resultados pusieron de manifiesto una importante falta de sistematización que se ha tratado de solventar definiendo, mediante un proceso colaborativo y de acuerdo con los criterios de calidad más consensuados, los componentes clave del nuevo programa: fundamentación teórica y metodológica, destinatarios, objetivos, contenidos, condiciones de implementación y diseño de la evaluación. El alto grado de acuerdo de profesionales y responsables con las características propuestas puede contribuir a que la implementación del programa se lleve a cabo con fidelidad al diseño original y, con ello, favorecer su efectividad.
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