Abstract

Neocortical tissue prisms prepared from rat and human brain were frozen to -196 degrees C by a two-step freezing procedure and 10% dimethyl sulphoxide as cryoprotectant. Frozen and thawed rat neocortical prisms incorporated glucose into acetylcholine and carbon dioxide at 89% and 86% of control values, respectively, and noradrenaline uptake into frozen and thawed rat prisms was 94% of the control value. Frozen and thawed prisms from three human neocortical specimens showed a similar degree of protection from freeze-thaw injury.

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