X-Message-Number: 8668
From: James <>
Newsgroups: sci.cryonics
Subject: Re: on changing the freezing point of water by pressure
Date: Sun, 12 Oct 1997 00:28:35 -0500
Message-ID: <>
References: <>

Hi,

I thought this was a very interesting post.  I particularly like the
ultrasound idea.  Anybody have any answers?  I do know that you cannot take
the pressure TOO high because you can actually start forcing water into
hydrophobic areas of proteins and thereby denature them.  But, this requires
megapascals if I recall correctly (these use it as a form of food
sterilization).

Sincerely,
James

Dale Trynor wrote:

>   Dale Trynor   
> I hope you forgive any mistakes I make at this because I'm still new to
> news groups . I have this question that I havent been able to find out
> much on . Its shown in physics books how you can go to about dry ice
> temps without water frezing under enough presure ,but I've never read
> about any experiments using this property of water in cryogenics
> preseveration of organs and if it was tried did it help much .and did
> they also try such things as rapidly changing the presure as for example
> by ultrasound so that both types of ice form that both shrink in volume
> and expand in volume so an ice may have no volume change .Note at a high
> enough presure an ice form that shrinks in volume occors and can even
> remain as ice way above its boiling point .but at the temps and presures
> I'm asking about ,any change in presure at such a critical presure point
> would cause an ice to form ,and could switch from one type of ice to the
> other .but if carful some of both could remain?.Could it be consederd an
> amopherous solid if rapid presure change was used to create it .also
> would such things as glycerine help. and sence at high presures CO2 is a
> liquid and is somewhat like water in its ability to desolve salts etc
> any segestions on it as a cryoprotectant ,also perhaps like freze drying
> but with a constantly dryed flow of liquid CO2. Im new to your group so
> do forgive me if this has been overly asked
>        sincearly   Dale Trynor

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