[pbs] FROSTS
gentian
gentian21 at insightbb.com
Tue Nov 13 14:50:55 EST 2007
Could it be that rapid thawing stimulates an infusion of water that was
blocked by the freezing thus causing more pressure on the cells that are
still partially frozen?
Frank Cooper
central Illinois
zone 5b
----- Original Message -----
From: "John T Lonsdale" <john at johnlonsdale.net>
To: "'Pacific Bulb Society'" <pbs at lists.ibiblio.org>
Sent: Tuesday, November 13, 2007 11:27 AM
Subject: Re: [pbs] FROSTS
> The size and shape of ice crystals is directly related to the amount of
> damage they cause, particularly in disrupting cellular organelles like
> membranes. Their size/shape is affected by the rate of freezing, among
> other parameters. Rapid and multiple freeze-thaw cycles are very bad for
> all living cells. Minimizing the number of freeze-thaw cycles and
> allowing
> controlled thawing make a big difference - cells can repair a certain
> amount
> of damage, but not rapidly and constantly.
>
> I think of frost as the white stuff that coats things but isn't ice or
> snow.
> Freezing is a descriptor of temperature - i.e. a temperature below the
> freezing point of whatever the material is. You can freeze without
> encountering frost.
>
> Best,
>
> J.
>
> John T Lonsdale PhD
> 407 Edgewood Drive,
> Exton, Pennsylvania 19341, USA
>
> Home: 610 594 9232
> Cell: 484 678 9856
> Fax: 801 327 1266
>
> Visit "Edgewood" - The Lonsdale Garden at http://www.edgewoodgardens.net
>
> USDA Zone 6b
>
>
>
>
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