Effects of Physical Forces on Bacteria 173 



proteins, unbalancing of the colloidal state, or actual cell disruption. 

 Vegetative cells exhibit greater sensitivities to these forces than 

 do spore-forming organisms. Shaking a liquid culture with glass 

 beads in a mechanical shaker, or rotating a culture in a ball mill, 

 are common practices employed for the disruption of bacterial 

 cells. 



