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(Rev Med Chile 2015; 143: 1598-1600

Perovskite oxides have the general formula ABO3, where A is typically an alkaline earth (AE) or a lanthanide and B is a transition-metal. This family of compounds is probably the most studied one in the last decades since understanding the structure-properties correlation is of fundamental and technological interest [1]. Despite the simplicity of the crystalline structure, the size variation of A and B cations creates an immense structural variety and generates deviations respect the ideal structure through changes in the crystal symmetry, that leads to the appearance of interesting properties. These properties are the origin of multiple applications, mostly related to energy conversion, adsorption and catalysis, among others.

Pre-eclampsia and hereditary thrombophilia Pré-eclâmpsia e trombofilia hereditária Resumen: Los trastornos hipertensivos del embarazo constituyen una de las principales causas de mortalidad materna y perinatal en todo el mundo. Se ha estimado que la pre-eclampsia complica del 2 al 8% de los embarazos a nivel mundial. Se han asociado múltiples factores de riesgo: antecedentes de pre-eclampsia, hipertensión arterial crónica, diabetes pre-gestacional, gestación múltiple, enfermedad renal crónica y algunas enfermedades autoinmunes (como el síndrome antifosfolípidico y el lupus eritematoso sistémico). Se realiza una revisión sobre las medidas generales de prevención de la pre-eclampsia.

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Exhausted TWCs subjected to chemical/thermal treatments were used as a support of MnOx catalysts for the total combustion of acetone. The so-prepared new devices were characterized by using adherence tests, elemental and thermal analyses, XRD, N2 physisorption, and SEM-EDS. Incorporation of only 2.6 wt.% of the active phase (Mn2O3 and Mn3O4) to the recycled honeycomb considerably improved the catalytic response, achieving at 250 °C a 60% increase in acetone conversion with respect to the spent autocatalyst. The following procedure is proposed as a simple way to provide the TWC devoid of noble metals a second life in the VOCs’ oxidation field.