definition of aging

Richard Lockshin rick at sjubiol.stjohns.edu
Thu Feb 24 02:23:40 EST 1994

To: ageing at net.bio.net
From: uunet!life.nthu.edu.tw!mjhsieh (Meng-Juei Hsieh) (Francis MJ Hsieh)
Subject: Definition of "Ageing"
      Can I ask you all a question ? That is ; "what is the
definition of ageing?"
I presume that you mean "senescence", which is usually as an increased
probability, with time, of dying.  Thus, organisms that show a linear
disappearance over time are not considered to senesce, but organisms, 
like mammals, that show a (logarithmically) increasing probability of
dying as they age are considered to senesce.  See Alex Comfort's classic
"The Biology of Senescence," a book with a somewhat similar title by
Peter Medawar, the introductory chapters in Finch and Hayflick (1st
edition:  Finch and others, later editions) Handbook of the Biology of
Aging, or Finch (CE)'s latest encyclopedic tome. That should provide enough
for you.
--richard lockshin

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