Sobre Κρῆτες de Sófocles

En este artículo se estudia una obra atribuida a Sófocles titulada Κρῆτες (Los cretenses), una tragedia sólo conocida por dos dudosos testimonios de Hesiquio y Ateneo de Náucratis. A finales del siglo xviii una nueva lectura de ambos los adscribía a otra tragedia, con lo que se negaba la existencia de Κρῆτες. A pesar de esto, este título se sigue manteniendo en las ediciones de la obra sofoclea, ahora relacionado con nuevos hallazgos de fragmentos papiráceos del autor. Nuestro objetivo es el de analizar los testimonios en profundidad para concluir si la obra pudo o no haberse escrito.

Xanthoria parietina as a biomonitor of airborne heavy metal pollution in forest sites in the North East of Morocco

Xanthoria parietina, common foliose lichen, growing in its natural habitat, was analysed for the concentration of five heavy metals (Fe, Cr, Zn, Pb and Cu) from different forest sites of North East of Morocco (Kenitra, Sidi Boughaba, Mkhinza, Ceinture Verte near Temara city, Skhirate, Bouznika and Mohammedia). The quantification was carried out by inductively coupled plasma - atomic emission spectrometry (ICP-AES). Results were highly significant p<0,001. The concentration of metals is correlated with the vehicular activity and urbanization. The total metal concentration is highest at the Kenitra area, followed by Ceinture Verte site near Temara city, which experience heavy traffic throughout the year. Scanning electron microscopy (SEM) of particulate matter on lichen of Xanthoria parietina was assessed as a complementary technique to wet chemical analysis for source apportionment of airborne contaminant. Analysis revealed high level of Cu, Cr, Zn and Pb in samples near roads.