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Free body diagram of an idealized, nonflagellated bacteria atop an array of rigid nanopillars. (a) The only significant force driving contact is from adhesion (Fa), whereas other physical forces such as weight (Fg) and buoyancy (Fb) are comparatively insignificant (Fa ≫ Fg ∼ Fb). (b) Shown is the propagating bond front of finite-ranged intermolecular adhesion forces. To see this figure in color, go online.
