Centrifugation, IsopycnicMetrizamideCentrifugation, Density GradientCell FractionationCentrifugation, ZonalCentrifugationMicroscopy, ElectronCesiumAcid PhosphataseSubcellular FractionsTritiumLysosomesNucleotidasesHydrolasesParticle SizeMolecular WeightCell MembraneElectrophoresis, Polyacrylamide GelThymidineLiverCarbon IsotopesCell LineDNAPovidoneUltracentrifugation