X-Message-Number: 9013
Date: Fri, 16 Jan 1998 11:03:45 -0800 (PST)
From: John K Clark <>
Subject: Another Clock Found


I don't know if it has anything to do with aging but in today's (Jan 16) issue 
of Science, the same one that has the stuff about telomerase and immortal 

human cells, there is another interesting article. Scott Campbell and Patricia
Murphy found another biological clock, it works at a much higher level than
the cell and is a part of the brain called the suprachiasmatic nucleus. 
This clock is responsible for our sleep patterns among other things, when it 
gets out of whack we get jet lag and winter depression. Campbell and Murphy 
found a way to reset this clock with light, but the astonishing thing is that 
the light need not be applied to the eyes, anywhere on the skin will do, 
the back of the knee for example. There must be a signal but how the brain 
knows that light is being applied to the back of the knee is a mystery. 
The authors say the procedure is harmless and easy to do  and should soon be 
in common use on airliners. Any potential for more profound applications 
remains to be seen.

                                              John K Clark    

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