title: Zonal electrophoresis and isoelectric focusing of proteins and virus particles in density gradients of small volume.
mesh_terms: D002250:Carbon Radioisotopes; D002501:Centrifugation, Zonal; D004586:Electrophoresis; D005069:Evaluation Studies as Topic; D006367:HeLa Cells; D006801:Humans; D007525:Isoelectric Focusing; D008722:Methods; D008970:Molecular Weight; D017955:Poliovirus; D011506:Proteins / Q000302:isolation & purification*; D013056:Spectrophotometry, Ultraviolet; D014316:Tritium; D014764:Viral Proteins / Q000302:isolation & purification*
chemical_list: D002250:Carbon Radioisotopes; D011506:Proteins; D014764:Viral Proteins; D014316:Tritium