title: Effects of cryopreservation on human lymphocyte functions: comparison of programmed freezing method by a direct control system with a mechanical freezing method.
abstract: The effects of cryopreservation with a new-type programmed freezer (TNP-82) were examined on natural killer (NK) activity and cell recovery of lymphocytes. This instrument is controlled by a sensor which directly detects the temperature in the samples, enabling easy setting of the temperature curve. Comparing results obtained by the new method to those from a less sophisticated mechanical method, cell recovery after cryopreservation was improved (95.3%) in the new compared to the older (about 80%) method. Furthermore, NK activity, percentage of Leu7+ cells and other lymphocyte functions were unaltered.
mesh_terms: D000954:Antigens, Surface / Q000032:analysis; D002470:Cell Survival; D005615:Freezing; D006801:Humans; D007694:Killer Cells, Natural / Q000502:physiology; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000502:physiology*; D011309:Preservation, Biological / Q000379:methods*; D012397:Rosette Formation; D013997:Time Factors
chemical_list: D000954:Antigens, Surface