CAMBRIDGE, England â British scientist Stephen Hawking has decoded some of the most puzzling mysteries of the universe but he has left one mystery unsolved: How he has managed to survive so long with such a crippling disease.
Brownian movement. n. 1. (General Physics) random movement of microscopic particles suspended in a fluid, caused by bombardment of the particles by molecules of the fluid. First observed in 1827, it provided strong evidence in support of the kinetic theory of molecules.
This movement of nonmotile bacteria is actually a Brownian movement; even dead bacteria seem to be moving because of this movement. Craigie's tube or capillary tube can be used by placing them in broth culture for observation of directed movement of bacteria towards chemical or physical gradients with time.