I mulled this mystery over in my head as I worked in lab through the mind-numbing preparation of double-banding plasmid DNA on isopycnic CsCl gradients for transfection (just before Qiagen kits, you young whippersnappers).    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

However, using a combination of isopycnic density (equilibrium) centrifugation and florescent particle sorting, the researchers, led by Dr Toni Aebischer of the Institute of Immunology and Infection Research at the University of Edinburgh, managed to purify the amastigote form of.    From Wordnik.com.  [LabTechnologist RSS] Reference

After the transgenic parasites had been allowed to infect a number of host cells, they separated the cell components by weight using isopycnic density centrifugation before sorting the fluorescent parasites from the other cellular material using a fluorescence-activated cell sorting (FACS) techniques.    From Wordnik.com.  [LabTechnologist RSS] Reference

(1991) The isopycnic, compartmentalized integration of Rous sarcoma virus sequences.    From Wordnik.com.  [PLoS ONE Alerts: New Articles] Reference