I would hope that any definition of "biofilm" considers phenomena beyond the
well-known aqueous based model. Microbes will inhabitand affect (including
grade) virtually any somewhat hydrated surface from skin to concrete and rocks
- growth that I would call a biofilm and growth that may not be accompanied by
EPS, unique cellular organization or, to this point, expression of a
discernable "biofilm" phenotype.
Please consider lichens, the infestation of concrete, etc in your thinking.
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