Center: Detail of Pobla de Segur (1971), oil on canvas 68 × 92 cm. Banc de Sabadell Collection. By Catalan artist Miquel Villa Bassols (1901-1988). Villa Bassols spent several years in Paris in the 1920s, and there he frequented Jean Fautrier, Marcel Duchamp, Josep Togores, Pancho Cossío and sculptor Pablo Gargallo, and got the influence of Cezanne and Renoir, among others. The painting reproduces a concrete bridge on the river near La Pobla de Segur, a village in the Pyrinees, where the 9th SEM Introductory Course to Microbiological Research was held in July 4 through 8, 2005. Concrete, like other inert materials used in the building industry, can be deteriorated by the presence and activities of surface-associated microorganisms. See this monographic issue devoted to Biodeterioration and Biodegradation and the whole painting.

Upper left: Several virions of human adenovirus isolated from the urine of a bone-marrow-transplant patient. Virus particle size is around 75 nm. Negative-staining with potassium phosphotungstate. Transmission electron micrograph courtesy of Laureano Cuevas (Electron Microscopy Unit, National Center for Microbiology, Majadahonda, Spain). (Magnification, ca. 175,000×)

Upper right: Transmission electron micrograph of the bacterium Clostridium bifermentans and its endospore, isolated from Ebro Delta microbial mats. Ultrathin sections were collected on copper grids and poststained with uranyl acetate and lead citrate. Samples were visualized on a JEM1010 TEM microscope (JEOL). This strain was isolated and photographed by Laura Villanueva (Department of Microbiology, University of Barcelona, Spain). (Magnification, ca. 35,000×)

Lower left: Culture of the protist Leishmania infantum promastigotes, kindly provided by F. Grimm (University of Zürich, Switzerland). Photographed after Giemsa-staining by María Colmenares (Molecular Parasitology Laboratory, Biological Research Center, CSIC, Madrid). (Magnification, ca. 2000×)

Lower right: The fungus Syncephalastrum racemosum CECT 2569. Spores develop in rows in elongated merosporangia. Scanning electron micrograph courtesy of Josefa Bosch, Jordi Abellà, and Montserrat Agut (Chemical Institute of Sarrià, Ramon Llull University, Barcelona, Spain). (Magnification, ca. 2000×)

See the whole painting