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Cover Figure


Cover photograph (Copyright © 2005, American Society for Microbiology. All Rights Reserved.): Light micrograph of the edge of a bacterial colony of Pseudomonas aeruginosa grown on solid growth medium and stained with the dye Congo Red. The colony is a variant that displays a small, rough, wrinkled morphology (in comparison to the smooth, rounded colonies formed by the parental strain). These variants spontaneously arise in P. aeruginosa laboratory biofilms, and the Congo Red is thought to stain a putative exopolysaccharide material that is overproduced in the variant. Magnification, 40×. (See related article on page 4809.)


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