In a message dated 2/17/00 0:53:21, rsunley@escape.ca wrote:
>More to the point, can _unmodified_ humans breathe a heavy oxygen/heavy
nitrogen
>atmosphere without developing lung cancer, or asphyxiation, or similar
>unpleasantness?
Life in general uses more lighter elements; heavy elements have slower
kinetics. E. coli does fine in heavy nitrogen, but Xenopus laevis (an African
frog) can't do its cortical rotation (an essential developmental process)
in heavy water.
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