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Derallus Sharp, 1882, de distribución Neotropical, pertenece a la tribu Berosini y está representado por 15 especies. D. angustus Sharp está ampliamente distribuida desde Guatemala hasta Argentina. El objetivo de este trabajo es el estudio de la dinámica poblacional de esta especie, en un limnótopo ubicado en el extremo sur del Dominio Subtropical de la Región Neotropical. El sitio de muestreo está localizado en Punta Lara (34°47’ S, 58°01’ W, Ensenada, Buenos Aires Province, Argentina). Se realizaron 27 muestreos durante un período de un año, cada uno consistió en la extracción de 20 muestras al azar de 200 cm² de vegetación flotante. El estado de pupa no fue incluido en este estudio. Se reconocieron dos picos de máxima abundancia del primer estadio larval (el primero a fines de primavera y el otro a fines del verano). Durante todo el período de estudio se registraron tanto adultos como larvas de tercer estadio. Se interpreta que la población es univoltina con dos períodos de actividad reproductiva.

Derallus Sharp, 1882 is a Neotropical genus of aquatic coleopterans that belongs in the tribe Berosini and includes 15 species. D. angustus Sharp is widely distributed from Guatemala to Argentina. The population dynamics of this species was studied by periodic sampling of a natural population from the southernmost Subtropical Domain of the Neotropical Region. The study site was near Punta Lara (34°47’ S, 58°01’ W; Ensenada, Buenos Aires province, Argentina). Twenty seven samples consisting of 20 units of aquatic vegetation (200 cm² each) were taken during one year. Larvae and adults were removed from the vegetation and counted (pupae were not studied). There was a peak of first instar larvae abundance at the end of spring, and another at the end of summer. Adults and third instar larvae were present throughout the whole year. The population is interpreted as being univoltine and including two periods of enhanced reproductive activity. Rev. Biol. Trop. 56 (1): 345-348. Epub 2008 March 31.

Magnesium is potentially useful for orthopaedic and cardiovascular applications. However, the corrosion rate of this metal is so high that its degradation occurs before the end of the healing process. In industrial media the behaviour of several magnesium alloys have been probed to be better than magnesium performance. However, the information related to their corrosion behaviour in biological media is insufficient. The aim of this work is to study the influence of the components of organic fluids on the corrosion behaviour of Mg and AZ31 and LAE442 alloys using potentiodynamic, potentiostatic and EIS techniques. Results showed localized attack in chloride containing media. The breakdown potential decreased when chloride concentration increased. The potential range of the passivation region was extended in the presence of albumin. EIS measurements showed that the corrosion behaviour of the AZ31 was very different from that of LAE442 alloy in chloride solutions.

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