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Role of Exchange and Dipolar Interactions in the Radical Pair Model of the Avian Magnetic Compass
- Article from:
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Biophysical Journal
- Article date:
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March 1, 2008
- Author:
- Efimova, Olga; Hore, P J
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Copyright informationCopyright Biophysical Society Mar 1, 2008. Provided by ProQuest LLC. (Hide copyright information)
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ABSTRACT
It is not yet understood how migratory birds sense the Earth's magnetic field as a source of compass information. One suggestion is that the magnetoreceptor involves a photochemical reaction whose product yields are sensitive to external magnetic fields. Specifically, a flavin-tryptophan radical pair is supposedly formed by photoinduced sequential electron transfer along a chain of three tryptophan residues in a cryptochrome flavoprotein immobilized in the retina. The electron Zeeman interaction with the Earth's magnetic field (~50 µT), modulated by anisotropic magnetic interactions within the radicals, causes the product yields to depend on the orientation of the receptor. ...
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Is Earth's faltering magnetic field turning south?
Deseret News (Salt Lake City);
December 12, 2003 ;
Kenneth Chang New York Times News Service;
631 words
......spinning, with dire effects on the magnetic field that protects the planet from energy-charg...Scientists have known for some time that the magnetic field is in fact collapsing -- at a rate...geophysicists increasingly wonder whether the magnetic field has begun one of its occasional ...
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MARS GLOBAL SURVEYOR DETECTS MARTIAN MAGNETIC FIELD AS AEROBRAKING BEGINS
Regulatory Intelligence Data;
September 17, 1997 ;
INDUSTRY GROUP 91;
787 words
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The Hindustan Times;
July 1, 2008 ;
408 words
......liquid outer core are weakening the magnetic field in some regions of the planet's surface...changes take place in the Earth's magnetic field," said study co-author Nils Olsen...current, which generates the planet's magnetic field. The study modeled Earth's magnetic...
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Differentiation of myoblasts is accelerated in culture in a magnetic field
In Vitro Cellular & Developmental Biology;
June 1, 2000 ;
Yuge, Louis; Kataoka, Katsuko;
787 words
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Power line magnetic field interference
Electromagnetic News Report;
November 1, 2000 ;
Kimmel, William D; Gerke, Daryl D;
787 words
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Earth's heart beats with a magnetic rhythm. (rhythm of strength of...
Science News;
November 20, 1993 ;
Monastersky, Richard;
605 words
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ODP Cores Provide Insight on Magnetic Field Reversal
Sea Technology;
May 1, 2004 ;
Anonymous;
289 words
...The time is takes for the Earth's magnetic field to reverse polarity is approximately...scientists' understanding of how Earth's magnetic field works. According to scientists, the magnetic field has exhibited a frequent but dramatic...
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Solar magnetism: Memories are made of this.(research on solar magnetic...
Science News;
February 12, 2000 ;
Cowen, R.;
524 words
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Swiss Inventors Develop Magnetic Field Direction Detection Sensor
US Fed News Service, Including US State News;
June 29, 2007 ;
324 words
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Tracing corrosion's magnetic field.
Science News;
August 30, 1986 ;
Peterson, Ivars;
647 words
...Tracing Corrosion's Magnetic Field The ravages of corrosion are...metal surfaces (see diagram). The magnetic field measurements were done with a...other out and generate no net magnetic field. With the magnetometer about...
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Magnetic field faces change in direction
The Milwaukee Journal Sentinel;
December 29, 2003 ;
GLENNDA CHUI;
582 words
...Magnetic field faces change in direction By GLENNDA...could happen if the Earth's protective magnetic field continues to weaken and then flips...thousands of years if it does happen. The magnetic field has grown weaker before, only to perk...
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SPACECRAFT DETECTS MARS MAGNETIC FIELD.(Local)
Rocky Mountain News (Denver, CO);
September 18, 1997 ;
Verrengia, Joseph B.;
377 words
......Global Surveyor has detected a weak magnetic field around the red planet, the first indication of a magnetic field in more than a dozen missions to...three decades. The presence of a magnetic field suggests Mars has a molten core...
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Homing in on animal magnetism. (earth's magnetic field for long migratory...
Science News;
August 23, 1986 ;
Davis, Lisa;
430 words
......followed the variations in the earth's magnetic field homeward ... poor wicked witch. That...accepted that birds use the earth'se magnetic field for general oreintation on long migratory...have map sense as well. The earth's magnetic field, the researcher says, might provide...
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World's most powerful magnet. (Magnets).(National High Magnetic Field...
Popular Mechanics;
March 1, 2003 ;
Eisenstein, Paul;
787 words
......have been discovered. With a magnetic-field strength of 100 billion teslas...dwarfs that of the Earth, whose magnetic field measures just 0.00005 tesla...Researchers at the National High Magnetic Field Laboratory (NHMFL) in Tallahassee...
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South Korean Inventors Develop Magnetic Field Map Generation Apparatus
US Fed News Service, Including US State News;
November 29, 2007 ;
344 words
......developed an apparatus for generating magnetic field map. According to the U.S. Patent &...Provided is a method of generating a magnetic field map including obtaining magnetic field information, the magnetic field information...
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