Biomonitoring of air pollutants by using lichens (Evernia prunastri) in areas between Kenitra and Mohammedia cities in Morocco.

In this study, Evernia prunastri, a lichen growing in its natural habitat in Morocco was analysed for the concentration of five heavy metals (Fe, Pb, Zn, Cu and Cr) from eleven sites between Kenitra and Mohammedia cities. The control site was Dar Essalam, an isolated area with low traffic density and dense vegetation. In the investigated areas, the concentration of heavy metals was correlated with vehicular traffic, industrial activity and urbanization. The total metal concentration was highest in Sidi Yahya, followed by Mohammedia and Bouznika. The coefficient of variation was higher for Pb and lower for Cu, Zn and Fe. The concentrations of most heavy metals in the thalli differed significantly between sites (p<0.01). Principal component analysis (PCA) revealed a significant correlation between heavy metal accumulation and atmospheric purity index. This study demonstrated also that the factors most strongly affecting the lichen flora were traffic density, the petroleum industry and paper factories in these areas. Overall, these results suggest that the index of atmospheric purity and assessment of heavy metals in lichen thalli are good indicators of the air quality at the studied sites.

Social networks applied to training

In this article, we address the importance and relevance that social networks exhibit in their use as an educational resource.  This relevance relies in the possibility of implementing new learning resources or increasing the level of the participant's connectivity, as well as developing learning communities.  Also, the risk entailed from their use is discussed, especially for the students that have a low technological education or those having excessive confidence on the media.  It is important to highlight that the educational use of social networks is not a simple extension or translation of the student's habitual, recreational use, but that it implies an important change in the roles given to teachers as well as learners; from accommodative learning environments that only encourage memorization to other environments that demand an active, reflective, collaborative and proactive attitude, that require the development/acquisition of technological as well as social abilities, aptitudes and values.  It is also important to highlight that a correct implementation and adequate use will not only foment formal learning, but also informal and non-formal learning.

Reflexiones y representaciones del exilio: de El canto del peregrino (1999) a "El sefardí romántico" (2005)

El exilio es un tema recurrente en la obra de Angelina Muñiz-Huberman, miembro del llamado grupo hispanomexicano. La visión del exilio en su obra incluye no solo el exilio republicano sino también el del pueblo judío. Por eso, diferentes Diásporas históricas se superponen enriqueciendo el significado de la experiencia. En su ensayo El canto del peregrino: hacia una poética del exilio (1999) desarrolla sus pensamientos sobre el exilio y analiza numerosos trabajos de autores exiliados (judíos y republicanos españoles) centrándose en como cada uno reflejó la vivencia del exilio en su trabajo.En mi opinión, las ideas desarrolladas en el ensayo se pueden encontrar en su novela El sefardí romántico: la azarosa vida de Mateo Alemán II (2005). El título de la novela establece una conexión directa con la novela picaresca y la vida judía aludiendo al autor converso de Guzmán de Alfarache (1599-1604). Siguiendo el patrón establecido por la novela picaresca clásica, el protagonista de Muñiz-Huberman viaja por España y Europa denunciando la intolerancia que llevó a la Guerra Civil española y a la II Guerra Mundial. Las circunstancias lo llevan al exilio en México, como en el caso de Mateo Alemán. Según la teoría de Ulrich Wicks, pícaros y exiliados tienen mucho en común en su búsqueda continua de libertad, libertad que el exiliado puede encontrar solo en el idioma, como expone Muñiz-Huberman en su ensayo.