Welcome to the McLean lab (Slime Gang) website. We are microbiologists who are interested in studying the biology of bacteria as they normally occur in nature. Typically bacteria are present as mixed (polymicrobial) populations that are attached to surfaces as biofilm communities. The picture above shows a hot spring near Viterbo Italy (water temperature is 52C (125F) and pH is 7.2). Here, mixed populations of photosynthetic cyanobacteria that grow as surface-attached communities (biofilms), produce white calcium carbonate crystals that are “glued” together by the extracellular polymers (aka slime) within the biofilm. The resulting white-colored rock formed by the biofilm is called travertine (seen on the surface and bottom of this hot spring). I invite you to use the links to explore about the research and people in our lab.