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[DSLF] Digest Number 1817

There are 3 messages in this issue.

Topics in this digest:

      1. Cancer research abstract
           From: Stephen Pauley <spauley2@cox...>
      2. Over the Hedge Cartoon
           From: Mike Hansen <mhansen@einhornresearch...>
      3. Re: Light at night-cancer risk in humans verified
           From: <suchida@mvc....ne.jp>


Message: 1         
   Date: Sun, 04 Dec 2005 13:52:06 -0700
   From: Stephen Pauley <spauley2@cox...>
Subject: Cancer research abstract

<<Sent to me from an upstate environmentalist:
Susan Harder>>
The research summary article in the above web site has an **incorrect 
"Injection of blood from those women who donated during daylight or who
were exposed to light while they slept had no effect on the growth of 
the tumours."

Actually the daylight human blood has low mlt. as well as the human blood
from the women exposed to LAN.  Injection of that low mlt blood into 
the rats with the
implanted cancer cells caused the cancer cells to proliferate, not 
have "no effect
on the growth of the tumors."

And the low rates of tumor growth occurred when:
1) daytime blood (high mlt) was injected;  2) blood from women allowed
to sleep in the dark (high mlt); 3) when mlt. was added to low mlt. 
blood samples.

Furthermore, blocking the mlt. receptor sites on the surface of cancer cells
with a commercially manufactured mlt. receptor blocker and preventing the
uptake of mlt. into cancer cells, caused cancer cell proliferation, 
proving that
it is indeed the effects of low mlt. causing the cancer cells to grow.

The protective mechanism of mlt. on cancer cells works like this:
the mlt. molecule attaches itself to the cell membranes of the cancer cells
and blocks the uptake of the nutrient linoleic acid (LA) which if allowed
entry into the cancer cell will help it divide and the cancer will 
increase in size.
Their measurements of LA levels proves this relationship.

There is no question now that mlt. is indeed the protective agent
IN HUMANS and we need high levels of mlt at night i.e.
we need to sleep in total darkness.

Steve Pauley MD


Message: 2         
   Date: Sun, 4 Dec 2005 16:25:19 -0500
   From: Mike Hansen <mhansen@einhornresearch...>
Subject: Over the Hedge Cartoon

This is at least the second time that this comic strip has focused on  

A few years ago the strip included this dialog:

"Used to be we could see the Milky Way.
"That was before all this light pollution.
"Another unintended side effect of man's arrogant quest to outshine  
"sigh . . ."
"Verne sure whines a lot."
"Yeah, I can see my Milky Way just fine. [holding out candy bar]  
Wanna bite?"
"No thanks. It'll spoil my Three Musketeers."

I can e-mail a copy to anyone interested. Send an e-mail to me  
directly, off list.

Mike Hansen
2561 Massachusetts Ave. #1
Cambridge, MA 02140-1020

[Non-text portions of this message have been removed]


Message: 3         
   Date: Mon, 5 Dec 2005 16:35:55 +0900
   From: <suchida@mvc....ne.jp>
Subject: Re: Light at night-cancer risk in humans verified

Stephen Pauley wrote;
> Future research needs to answer these questions:
> Where is the lower limit of illuminance  causing this effect?
> Do all light colors create this harmful effect or is it with white
light only?
> The melatonin suppressive effects caused by indoor bedroom lighting
> sources must also be studied in humans.

One example of such research, although its sample is small, is made by
Kochi University. It shows exposure of bright light of 2000 lux and even
moderate lights of 200- 300 lux from fluorescent light bulbs can inhibit
melatonin concentration in adolescents. The paper can be obtained at;

Figure 1 shows effects of light to melatonin concentration.

The paper is one of its series to study effects of nighttime light to
the life of adolescents in Japan. Exposure to bright light during early
to late hours (19:30 to 22.30) affects the melatonin level and also
affects quality of life by depleting their sleep hours and quality of
sleep as well. Adolescents who spend their late hours under bright light
have more problems of human relations, study, mental health and other
mental problems.

> Lessons from this study:
> Any model lighting ordinance (mlo) that is produced by the IDA, the
> IESNA, or the two organizations combined, MUST take these human
> light-melatonin-cancer studies into account.
> The currently proposed IDA mlo does NOT and must be changed
> to protect the public's health.  Any compromising on this
> would be irresponsible.

Also any lighting standard and guidelines as of today MUST be changed to
properly control light trespass to adjacent areas. Examples of such
standard include CIE 150 "Guide on the limitation of the effects of
obtrusive light from outdoor lighting installations", IESNA TM-11-00
(which is technical memorandum) and Australian standard AS4232 "Control
of the obtrusive effects of outdoor lighting".

Shigemi Uchida


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