X-Message-Number: 6587
Date: Mon, 22 Jul 1996 23:56:41 -0400
From: "Keith F. Lynch" <>
Subject: SCI.CRYONICS Re: Q re Prometheus

In cryomsg #6570,  (Brian Wowk) wrote:
> A major thrust of the project will be development of methods
> for in-situ cryopreservation of the brain-- deep cooling the brain
> of large mammals while leaving the rest of the body warm enough to
> avoid damage.

This is the main reason I haven't made any pledge yet.

* How do you cool a brain embedded in a warm body?  Sure you can use
  perfusion, but only until the perfusate becomes too cold and viscous
  to flow.

* How do you keep the vitrified brain cold when it's embedded in a
  warm body?

* How do you keep the parts of the body adjacent to the vitrified
  brain from freezing?

* How do you rapidly rewarm the brain without roasting the rest of
  the animal?

I will make a pledge when I get a believable answer to each of these
questions.  Or when I hear of some plausible method of testing viability
which doesn't involve a vitrified brain in a warm body.
--
Keith Lynch, 
http://www.access.digex.net/~kfl/


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