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 Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=8668