Science > Physics > PHYSICAL REVIEW FOCUS 8 January 2008 http://focus.aps.org/
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Science > Physics |
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"Sam Wormley" |
| Date: |
08 Jan 2008 10:06:07 PM |
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PHYSICAL REVIEW FOCUS 8 January 2008 http://focus.aps.org/ |
PHYSICAL REVIEW FOCUS 8 January 2008 http://focus.aps.org/
David Ehrenstein, American Physical Society
Introductions to the Focus stories of the past week;
visit http://focus.aps.org for the complete stories.
WHY SLEEP?
Why we sleep remains a mystery. Competing theories claim
various "house-cleaning" brain activities occur during sleep,
but they can't say why we need to power down to accomplish
them. A study in the January Physical Review E suggests that
a sleep-wake cycle, allowing the brain to focus on one task
at a time, may be the most efficient way to operate. The
researcher shows mathematically that processing a
continuously changing resource--sensory input, in the
brain's case--is best done "offline," when there's no input.
This sort of analysis may lead to a more precise biological
explanation for why sleep and other biological cycles evolved.
(Emmanuel Tannenbaum, Phys. Rev. E to be published)
COMPLETE Focus story at http://focus.aps.org/story/v21/st1
Also from PRL (stories from AIP's Physics News Update):
THE SIZE OF THE HELIOM-8 NUCLEUS HAS BEEN MEASURED
Story at http://www.aip.org/pnu/2007/split/851-2.html
(P. Mueller et al., Phys. Rev. Lett. 99, 252501)
A PERSISTANT FLOW OF BOSE-CONDENSED ATOMS IN A TOROIDAL TRAP
Story at http://www.aip.org/pnu/2007/split/851-1.html
(C. Ryu et al., Phys. Rev. Lett. 99, 260401)
AMOEBAS ANTICIPATE CLIMATE CHANGE
Story at http://www.aip.org/pnu/2008/split/852-1.html
(Tetsu Saigusa et al., Phys. Rev. Lett. 100, 018101)
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Copyright 2008, The American Physical Society.
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