ageing rates in different species

John Otto otto at fsu1.cc.fsu.edu
Tue Jul 30 14:41:00 EST 1991


In article <1793 at nih-csl.nih.gov>, sullivan at alw.nih.gov (Sullivan) writes...
>In article <176612 at tiger.oxy.edu>, hoopes at oxy.edu (Laura L. M. Hoopes) writes:
>|> Since the field of gerontology really lacks a consensus on this issue, I'll
>|> just give you my view and hope that others out there will post theirs.	I
>|> view different ageing rates as differences in the protective/repair capaciti
>|> es of different organisms, as determined by their genetic capabilities. The
>|> process of ageing itself seems to me to be merely an expression of the secon
>|> d law of thermodynamics, but the defenses against this onslaught of the
>|> universe are tremendously variable between organisms.  Because I am a molec

>	One celled animals divide and I assume age (do they?).  Obviously
>	they do not (at least they all do not) or they'd die out
>	as a species.  Presumable, one celled animals have the same
>	onslaughts as human cells face from the environment.  Why, if
>	one celled animals do not age, do human cells?

I think of it more as just a life-long sequence of changes, 
"programmed" by both the DNA and by the other contents of
the egg (of the cell at division if uni-cellular).  The 
age "correcting" mechanisms involved in reproduction are
just another part of the sequence.  Aging takes place in
humans on both a system (and organ) level and a cellular level.
Looking at it on only one or the other scale is insufficient.
John G. Otto




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