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In the present work, metals (cadmium, lead, copper, nickel, tin, selenium, and mercury) have been estimated in the Ebro River (Spain) using the zebra mussel (Dreissena polymorpha) as an environmental bio-indicator. In two sequential studies, in 2006 and 2008, concentrations of metals were calculated in water as well as in the shells and fleshes of the zebra mussels. Samples were collected from assorted locations of the river. Metals were determined successfully at trace levels through voltamperometry, a sensitive technique. It has been noted that analysis of bioaccumulators like zebra mussels can be helpful in evaluating metal pollution in water.

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En este artículo presentamos FERMAT (Foro Experimental sobre Recursos de Matemática Aplicada a las Telecomunicaciones), portal de Internet alojado en http://www.campusvirtual.uma.es/fermat. Este trabajo ha sido realizado por un grupo de profesores del Departamento de Matemática Aplicada de la Universidad de Málaga y ha consistido, básicamente, en el desarrollo de herramientas científicas y pedagógicas que nos permiten transmitir a los alumnos de nuestra Universidad el interés por esta ciencia y sus aplicaciones. Describiremos los objetivos que nos planteamos, la metodología empleada, el portal que hemos elaborado así como el modo en que los alumnos lo utilizan. Terminaremos con un análisis de los resultados obtenidos, de las conclusiones finales y del trabajo futuro.

In this work we summarize the state of the art in the use of database functional dependencies. We compare the low impact that it has in the commercial environment with its successful acceptation in the academic environment. Particularly we remark that there does not exists any commercial development tool which uses the information provided by functional dependencies and this useful information is also deprecated by the database management systems. As a result of this, large database designs have to be rebuilt a few years after their establishment. In this work we identify the reasons which causes this situation and we propose a guideline to wide spread the effective use of Functional Dependencies in commercial design and tools.