Deep chest freezers are usually manually defrosted.
But even in frost-free freezers, only the freezing coils themselves
are heated to defrost them, not the contents of the freezer.
If the freezer is kept full (put plastic bottles of water in spaces where
there would otherwise be empty air) then the freezer will have a large
thermal mass, and the temperature of the contents will stay within a
half degree Celsius of the temperature you have set it, even during
defrost cycles.
In any event, the defrost cycle causes less heating to the contents than
opening the door of an almost empty freezer usually does. Keep the
freezer full.
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Get a free science project every week! "http://scitoys.com/newsletter.html"On Wed, Dec 21, 2011 at 5:13 PM, Cory Tobin <cory.tobin@gmail.com> wrote:
> Also, I recently learned that that is the temperature most freezers keep.Just remember that most kitchen freezers have a defrost cycle. If you
> YMMV, but it should be a fine place to store a plasmid.
want you sample kept consistently at -20 you would need to use a
non-defrosting freezer.
-cory
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