CentrifugationHypergravityCentrifugation, ZonalDecelerationGravitationCountercurrent DistributionGravity, AlteredCentrifugation, Density GradientAerospace MedicineWeightlessnessAviationAccelerationMicrofilmingSpace FlightWeightlessness SimulationHospital Bed Capacity, 500 and overMethodsUltracentrifugationCentrifugation, IsopycnicLaboratories, HospitalSucroseMicroscopyHematocritEquipment DesignCell FractionationMetrizamideTime FactorsMicroscopy, ElectronMolecular WeightSubcellular FractionsPovidoneElectrophoresis, Polyacrylamide GelCell SeparationFiltrationCell MembraneChromatography, GelKineticsTritiumOrganoidsCesiumCattleLiverSolubility