Results 11 to 20 of about 36,700 (277)
Magnetic field effects in biology from the perspective of the radical pair mechanism. [PDF]
J R Soc Interface, 2022 Hundreds of studies have found that weak magnetic fields can significantly influence various biological systems. However, the underlying mechanisms behind these phenomena remain elusive. Remarkably, the magnetic energies implicated in these effects are much smaller than thermal energies. Here, we review these observations, and we suggest an explanation
Zadeh-Haghighi H, Simon C.
europepmc +6 more sources
An open quantum system approach to the radical pair mechanism. [PDF]
Sci Rep, 2018 AbstractThe development of the radical pair mechanism has allowed for theoretical explanation of the fact that magnetic fields are observed to have an effect on chemical reactions. The mechanism describes how an external magnetic field can alter chemical yields by interacting with the spin state of a pair of radicals.
Adams B, Sinayskiy I, Petruccione F.
europepmc +7 more sources
Electron-Electron Dipolar Interaction Poses a Challenge to the Radical Pair Mechanism of Magnetoreception. [PDF]
J Phys Chem Lett, 2020 A visual magnetic sense in migratory birds has been hypothesized to rely on a radical pair reaction in the protein cryptochrome. In this model, magnetic sensitivity originates from coherent spin dynamics, as the radicals couple to magnetic nuclei via hyperfine interactions. Prior studies have often neglected the electron-electron dipolar (EED) coupling
Babcock NS, Kattnig DR.
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The Role of Pulsed Electromagnetic Fields on the Radical Pair Mechanism [PDF]
Bioelectromagnetics, 2021 In recent decades, the use of pulsed electromagnetic fields (PEMF) in therapeutics has been one of the main fields of activity in the bioelectromagnetics arena. Nevertheless, progress in this area has been hindered by the lack of consensus on a biophysical mechanism of interaction that can satisfactorily explain how low‐level, non‐thermal ...
CARLOS F Martino
exaly +6 more sources
Chemical magnetoreception in birds: the radical pair mechanism. [PDF]
Proc Natl Acad Sci U S A, 2009 Migratory birds travel vast distances each year, finding their way by various means, including a remarkable ability to perceive the Earth's magnetic field. Although it has been known for 40 years that birds possess a magnetic compass, avian magnetoreception is poorly understood at all levels from the primary biophysical detection events, signal ...
Rodgers CT, Hore PJ.
europepmc +6 more sources
Magnetic field effects as a result of the radical pair mechanism are unlikely in redox enzymes. [PDF]
J R Soc Interface, 2015 Environmental exposure to electromagnetic fields is potentially carcinogenic. The radical pair mechanism is considered the most feasible mechanism of interaction between weak magnetic fields encountered in our environment and biochemical systems. Radicals are abundant in biology, both as free radicals and reaction intermediates in enzyme mechanisms ...
Messiha HL +4 more
europepmc +6 more sources
A hybrid compass mechanism combining radical pairs and magnetite crystals. [PDF]
Proc Natl Acad Sci U S AThat night-migratory songbirds have a magnetic compass sense is undisputed. The nature of the sensor, however, is far from certain. The two leading hypotheses are organic radical pairs in cryptochrome flavoproteins and crystals of inorganic magnetic minerals such as magnetite.
Hore PJ.
europepmc +6 more sources
Journal of the American Chemical Society, 2004 The photoinduced electron-transfer reaction of chrysene with isomers of dicyanobenzene is used to demonstrate the sensitivity of a radical recombination reaction to the orientation and frequency (5-50 MHz) of a approximately 300 muT radio frequency magnetic field in the presence of a 0-4 mT static magnetic field. The recombination yield is detected via
Philipp Kukura +2 more
exaly +4 more sources
Sensing Magnetic Directions in Birds: Radical Pair Processes Involving Cryptochrome [PDF]
Biosensors, 2014 Birds can use the geomagnetic field for compass orientation. Behavioral experiments, mostly with migrating passerines, revealed three characteristics of the avian magnetic compass: (1) it works spontaneously only in a narrow functional window around the ...
Roswitha Wiltschko, Wolfgang Wiltschko
doaj +4 more sources
The Radical-Pair Mechanism of Magnetoreception [PDF]
Annual Review of Biophysics, 2016 Although it has been known for almost half a century that migratory birds can detect the direction of the Earth's magnetic field, the primary sensory mechanism behind this remarkable feat is still unclear. The leading hypothesis centers on radical pairs—magnetically sensitive chemical intermediates formed by photoexcitation of cryptochrome proteins in ...
P.J. Hore, Henrik Mouritsen
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