title: Isolation of polyoma virus and Semliki Forest virus from tissue culture fluid by continuous flow zonal ultracentrifugation.
mesh_terms: D000818:Animals; D002499:Centrifugation, Density Gradient; D002501:Centrifugation, Zonal; D046508:Culture Techniques; D008722:Methods; D051379:Mice; D011120:Polyomavirus / Q000302:isolation & purification*; D012672:Semliki forest virus / Q000302:isolation & purification*; D014461:Ultracentrifugation; D014776:Virus Cultivation