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- W2028146985 abstract "Vitrification is an attractive potential pathway to the successful cryopreservation of mature mammalian organs, but modern cryobiological research on vitrification to date has been devoted mostly to experiments with solutions and with biological systems ranging in diameter from about 6 through about 100 μm. The present paper focuses on concerns which are particularly relevant to large biological systems, i.e., those systems ranging in size from approximately 10 ml to approximately 1.5 liters. New qualitative data are provided on the effect of sample size on the probability of nucleation and the ultimate size of the resulting ice crystals as well as on the probability of fracture at or below Tg. Nucleation, crystal growth, and fracture depend on cooling velocity and the magnitude of thermal gradients in the sample, which in turn depend on sample size, geometry, and cooling technique (environmental thermal history and thermal uniformity). Quantitative data on thermal gradients, cooling rates, and fracture temperatures are provided as a function of sample size. The main conclusions are as follows. First, cooling rate (from about 0.2 to about 2.5 °C/min) has a profound influence on the temperature-dependent processes of nucleation and crystal growth in 47–50% (ww) solutions of propylene glycol. Second, fracturing depends strongly on cooling rate and thermal uniformity and can be postponed to about 25 °C below Tg for a 482-ml sample if cooling is slow and uniform. Third, the presence of a carrier solution reduces the concentration of cryoprotectant needed for vitrification (Cv). However, the Cv of samples larger than about 10 ml is significantly higher than the Cv of smaller samples whether a carrier solution is present or not." @default.
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- W2028146985 date "1990-10-01" @default.
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- W2028146985 title "Physical problems with the vitrification of large biological systems" @default.
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- W2028146985 doi "https://doi.org/10.1016/0011-2240(90)90038-6" @default.
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