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Photomicrographs of ship hull biofilms from one of Van Mooy's tests. The yellow and red spots are microbial cells; the red spots indicate cells that contain chlorophyll, such as algae. The left panel shows a copper-based anti-fouling coating with just a few cells adhering to it. The right panel shows a fouling-release coating with abundant cells and the mucilaginous slime that they secreted. The difference in color between the two panels is due to the way light from the microscope interacted with the two coatings. (Photomicrographs by Ben Van Mooy, Woods Hole Oceanographic Institution)[back]
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