Maintenance of Existing Controlled Rate Freezers

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NHSBT have requirements to cryopreserve haemopoietic stem cells for transplantation and Tissue Services cryopreserve processed tissue allografts (such as skin, arteries and heart valves). To ensure cell viability, the cells / tissues have to be frozen at a controlled rate prior to storing in vapour phase nitrogen at a temperature below-150°C. Rapid freezing would cause cell/tissue damage and result in the loss of cell/tissue viability; as such the products must be slowed at a rate no quicker tha...