scholarly journals Spin Dynamics in Radical Pairs

2018 ◽  
Author(s):  
Alan Lewis
Keyword(s):  
Spin Dynamics ◽  
Radical Pairs

Spin dynamics of neutral radical pairs in single crystals of di-tert-butyl-pryrocatechol doped with tetrakis(t-butyl)-phenoxazin

1993 ◽  
Vol 215 (4) ◽  
pp. 375-382 ◽  
Author(s):  
G.G. Lazarev ◽  
V.L. Kuskov ◽  
K. Laukenmann ◽  
A. Angerhofer
Keyword(s):  
Single Crystals ◽  
Spin Dynamics ◽  
Radical Pairs ◽  
Neutral Radical ◽  
Tert Butyl

scholarly journals Radical pairs may play a role in microtubule reorganization

2021 ◽  
Author(s):  
Hadi ZADEH-HAGHIGHI ◽  
Christoph Simon
Keyword(s):  
Magnetic Field ◽  
Radical Pair ◽  
Spin Dynamics ◽  
Radical Pair Mechanism ◽  
Magnetic Field Effects ◽  
Radical Pairs ◽  
Quantum Theories ◽  
Mechanism Model ◽  
Field Effects ◽  
Isotopic Dependence

The exact mechanism behind general anesthesia remains an open question in neuroscience. It has been proposed that anesthetics selectively prevent consciousness and memory via acting on microtubules (MTs). It is known that the magnetic field modulates MT organization. A recent study shows that a radical pair model can explain the isotope effect in xenon-induced anesthesia and predicts magnetic field effects on anesthetic potency. Further, reactive oxygen species are also implicated in MT stability and anesthesia. Based on a simple radical pair mechanism model and a simple mathematical model of MT organization, we show that magnetic fields can modulate spin dynamics of naturally occurring radical pairs in MT. We show that the spin dynamics influence a rate in the reaction cycle, which translates into a change in the MT density. We can reproduce magnetic field effects on the MT concentration that have been observed. Our model also predicts additional effects at slightly higher fields. Our model further predicts that the effect of zinc on the MT density exhibits isotopic dependence. The findings of this work make a connection between microtubule-based and radical pair-based quantum theories of consciousness.

Spin dynamics and EPR spectra of consecutive spin-correlated radical pairs. Model calculations

1997 ◽  
Vol 12 (2-3) ◽  
pp. 141-166 ◽  
Author(s):  
Yu. E. Kandrashkin ◽  
K. M. Salikhov ◽  
D. Stehlik
Keyword(s):  
Spin Dynamics ◽  
Epr Spectra ◽  
Radical Pairs ◽  
Model Calculations

Investigation of chemical and spin dynamics in micellized radical pairs by time-resolved stimulated nuclear polarization. Theory and experiment

1995 ◽  
Vol 244 (3-4) ◽  
pp. 245-251 ◽  
Author(s):  
A.P. Parnachev ◽  
E.G. Bagryanskaya ◽  
V.F. Tarasov ◽  
N.N. Lukzen ◽  
R.Z. Sagdeev
Keyword(s):  
Nuclear Polarization ◽  
Spin Dynamics ◽  
Radical Pairs ◽  
Time Resolved ◽  
Polarization Theory ◽  
Theory And Experiment

scholarly journals Radical pairs can explain magnetic field and lithium effects on the circadian clock

2021 ◽  
Author(s):  
Hadi Zadeh-Haghighi ◽  
Christoph Simon
Keyword(s):  
Magnetic Fields ◽  
Circadian Clock ◽  
Spin Dynamics ◽  
Hyperfine Interactions ◽  
Oscillator Model ◽  
Radical Pair Mechanism ◽  
Dependent Manner ◽  
Radical Pairs ◽  
Mechanism Model ◽  
Chemical Oscillator

Drosophila's circadian clock can be perturbed by magnetic fields, as well as by lithium administration. Cryptochromes are critical for the circadian clock. Further, the radical pairs in cryptochrome also can explain magnetoreception in animals. Based on a simple radical pair mechanism model of the animal magnetic compass, we show that both magnetic fields and lithium can influence the spin dynamics of the naturally occurring radical pairs and hence modulate the circadian clock's rhythms. Using a simple chemical oscillator model for the circadian clock, we show that the spin dynamics influence a rate in the chemical oscillator model, which translates into a change in the circadian period. Our model can reproduce the results of two independent experiments, magnetic fields and lithium effects on the circadian clock. Our model predicts that stronger magnetic fields would shorten the clock's period. We also predict that lithium influences the clock in an isotope-dependent manner. Furthermore, our model also predicts that magnetic fields and hyperfine interactions modulate oxidative stress. The findings of this work suggest that quantum nature and entanglement of radical pairs might play roles in the brain, as another piece of evidence in addition to recent results on xenon anesthesia and lithium effects on hyperactivity.

scholarly journals Radical pairs can explain magnetic field and lithium effects on the circadian clock

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Hadi Zadeh-Haghighi ◽  
Christoph Simon
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Circadian Clock ◽  
Spin Dynamics ◽  
Hyperfine Interactions ◽  
Oscillator Model ◽  
Radical Pair Mechanism ◽  
Dependent Manner ◽  
Radical Pairs ◽  
Chemical Oscillator

AbstractDrosophila’s circadian clock can be perturbed by magnetic fields, as well as by lithium administration. Cryptochromes are critical for the circadian clock. Further, the radical pairs in cryptochrome also can explain magnetoreception in animals. Based on a simple radical pair mechanism model of the animal magnetic compass, we show that both magnetic fields and lithium can influence the spin dynamics of the naturally occurring radical pairs and hence modulate the circadian clock’s rhythms. Using a simple chemical oscillator model for the circadian clock, we show that the spin dynamics influence a rate in the chemical oscillator model, which translates into a change in the circadian period. Our model can reproduce the results of two independent experiments, magnetic field and lithium effects on the circadian clock. Our model predicts that stronger magnetic fields would shorten the clock’s period. We also predict that lithium influences the clock in an isotope-dependent manner. Furthermore, our model also predicts that magnetic fields and hyperfine interactions modulate oxidative stress. The findings of this work suggest that the quantum nature of radical pairs might play roles in the brain, as another piece of evidence in addition to recent results on xenon anesthesia and lithium effects on hyperactivity.

Some peculiarities of spin dynamics of geminate radical pairs under microwave pumping

1993 ◽  
Vol 97 (50) ◽  
pp. 13259-13266 ◽  
Author(s):  
K. M. Salikhov ◽  
Yu. N. Molin
Keyword(s):  
Spin Dynamics ◽  
Radical Pairs
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