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On Tue, 19 Sep 1995, Richard Pyle wrote: > > This is exactly the same story I've heard, ..... > Rich > at the risk of adding to the lore....i speculate: just a guess, but remember the old perfusion/diffusion controversy in deco modeling in the 60s and 70s? you'd figure that if scar tissue was adjacent to well perfused (reasonable 1/2-time) tissue, that gas could still flow in and out of the scar tissue (slowly) by diffusion in contrast to the active transport (by blood) in well perfused tissue. further, if you had developed bubbles (tissue voids, tribonucleation, micronuclei, etc...) within this poorly perfused tissue, the bubbles would tend to have long life times. this would be so because bubbles are approximately at ambient pressure (skipping skin/volume effects....) and the gas dissolved in your tissue at pressures above ambient would diffuse into the bubbles leading to prolonged growth. mixed gas could make the whole situation worse as various components of the gas dissolved in the tissue would be trying to equalize PARTIAL pressure across the bubble/tissue interface. so if you bubble today on 3mix, and use argox for deco tomorrow, the argon could, in principle, diffuse into the bubble, cause it to grow, lower the bubble's internal pressure (skin effect), cause more gas to diffuse in, cause the bubble to grow, cause more gas to diffuse in, &c with the positive feedback. a dive to 10 ata should be effective in re-squashing the bubbles back into solution sez the professional bubble-deco modelers. regards, em _____________________________________________________________.sig Eric Maiken email: eapg243@ea*.oa*.uc*.ed* Dept. of Physics o: 714 824-6621 U of California fax: 714 824 2175 Irvine, CA 92715-4575
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