Method and apparatus for making density gradients

摘要: A float is used for preparing a density gradient in parallel-walled vessel. The has an outer peripheral surface that diameter smaller than inner of the With placed inside vessel liquid introduced onto such flows around between and wall shape configuration slows velocity there only laminar flow as contacts other below float. Elimination turbulent prevents mixing different into same thereby forming layers fluid. Preferably, centrifuge tube. In one embodiment, large enough to cause capillary action tube force remain