Apparatus and method for cryopreparing biological tissue for ult

Refrigeration – With illuminating or radiant energy means

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34 92, 118 501, 422131, 62514R, F25D 2300

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047426900

ABSTRACT:
This invention relates to apparatus for the cryopreparation of biological tissue samples for ultrastructural analysis. The use of the apparatus comprises vitrifying a biological tissue sample under cryogenic temperature conditions and ultra low vacuum conditions. The depressurized, vitrified tissue sample is brought to equilibrium in a thermally conductive sample holder at a temperature of less than -140.degree. C. The tissue sample is then dehydrated while maintained in a state of thermal equilibrium. After reaching equilibrium the tissue sample is optionally infiltrated with a degassed resin followed by a polymerization of the resin to form an embedded tissue sample.

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