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Adhesion. Definition. noun. (physics, chemistry) The force of attraction between unlike molecules, or the attraction between the surfaces of contacting bodies.(cell biology) The binding of a cell to another cell, or a cell to a surface, via specific cell adhesion molecules.upplement. Adhesion may refer to the joining of two different substances due to attractive forces that hold them. For instance, cohesion causes water to form drops and adhesion keeps the water drops on the surfaces of leaves and flowers in place.
The typical structure of a bacterial adhesion is that of a fimbria or pili. The bacterial adhesion consists primarily of an intramembranous structural protein which provides a scaffold upon which several extracellular adhesins may be attached.A large number of bacterial adhesins with individual receptor specificities have been identified.â Many bacterial pathogens are able to express an array of different adhesins. Expression of these adhesins at different phases during infection play the most important role in adhesion based virulence.