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Mean percentage (a) and size (b) of empty spaces obtained for S. salina LEGE 00041, Cyanobium sp. LEGE 06098, and Cyanobium sp. LEGE 10375 biofilms developed on perspex ■, silicone hydrogel coating ■, polystyrene ■, glass ■, and epoxy-coated glass ■ surfaces after 49 days. For each cyanobacterial isolate, different lowercase letters indicate significant differences between surfaces with a confidence level greater than 95% (p < 0.05).
