From: Joseph J HorvathDate: September 16, 2005 8:31:27 AM EDT Colleagues In regard to preservation of critical biological samples that need refrigeration at -70 C during a prolonged power outage, does anyone have experience in the use of liquid nitrogen as a back-up system, ie, I have read that some freezer units come with ports that one can hook the N2 to in such situations. thanks -joe
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