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United States Department of Agriculture

Agricultural Research Service

ARS Photo Library

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Image Number D055-16

Technician Remi Bonnart (foreground) flash-freezes plant shoot tips while plant physiologist Christina Walters places cryopreserved materials into cryovats for long-term storage. Droplets of cryoprotecting solution hold shoot tips onto foil strips. The strips are plunged into liquid nitrogen slush that is formed by placing liquid nitrogen in a vacuum.

Photo by Stephen Ausmus.


640 pixels wide: (D055-16.jpg)




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Last Modified: 5/23/2006
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