accumulations of microorganisms at surfaces such as those of a rock, a tooth or an oil droplet
A biofilm comprises any syntrophic consortium of microorganisms in which cells stick to each other and often also to a surface. These adherent cells become embedded within a slimy extracellular matrix that is composed of extracellular polymeric substances. Microorganisms that form
include bacteria, fungi and protists. One common example of a
dental plaque, a slimy buildup of bacteria that forms on the surfaces of teeth.
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