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Front cover illustration

Scanning-electron micrographs of a microbial biofilm developed on the surface of brick waste material used as a carrier in a submerged fixed biofilter for the removal of Cu(II) from water. Top image is approximately 400 �m wide; centre, 150 �m; bottom, 80 �m. Images courtesy Bel�n Rodelas Gonz�lez, Departamento de Microbiolog�a, Facultad de Farmacia, Universidad de Granada, Granada, Spain. See the paper by V�lchez et al. in this issue, pp. 325-337.