Drug Delivery SystemsNanoparticlesDrug CarriersNanomedicineNanostructuresSpace FlightMicrobubblesPolyglycolic AcidMetal NanoparticlesPolymersDigoxigeninGoldDendrimersNanocapsulesSiliconUltrasonicsParticle SizeContrast MediaLiposomesPolyethylene GlycolsDelayed-Action PreparationsDiagnostic ImagingMicroscopy, Electron, TransmissionCell Line, TumorDoxorubicinLactic AcidNeoplasmsGenetic TherapyCell SurvivalMolecular StructureGenetic Vectors