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Long-term preservation of complex engineered tissues and organs at cryogenic temperatures in the absence of ice has been prevented to date by the difficulty of discovering combinations of cryoprotectants that are both sufficiently non-toxic and sufficiently stable to allow viability to be maintained and ice formation to be avoided during slow cooling to the glass transition temperature and subsequent...
The simple linear polymer polyglycerol (PGL) was found to apparently bind and inhibit the ice nucleating activity of proteins from the ice nucleating bacterium Pseudomonas syringae. PGL of molecular mass 750 Da was added to a solution consisting of 1 ppm freeze-dried P. syringae 31A in water. Differential ice nucleator spectra were determined by measuring the distribution of freezing temperatures...
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