Magnetic Field Effects on Triplet Pair Generated by Singlet Fission in an Organic Crystal: Application of Radical Pair Model to Triplet Pair

2016 ◽  
Vol 120 (49) ◽  
pp. 27858-27870 ◽  
Author(s):  
Tomoaki Yago ◽  
Kei Ishikawa ◽  
Ryuzi Katoh ◽  
Masanobu Wakasa
Keyword(s):  
Magnetic Field ◽  
Radical Pair ◽  
Organic Crystal ◽  
Magnetic Field Effects ◽  
Singlet Fission ◽  
Field Effects ◽  
Pair Model ◽  
Triplet Pair

scholarly journals Fluorescence-detected magnetic field effects on radical pair reactions from femtolitre volumes

2015 ◽  
Vol 51 (38) ◽  
pp. 8023-8026 ◽  
Author(s):  
C. A. Dodson ◽  
C. J. Wedge ◽  
M. Murakami ◽  
K. Maeda ◽  
M. I. Wallace ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Fluorescence Microscopy ◽  
Total Internal Reflection ◽  
Radical Pair ◽  
Internal Reflection ◽  
Total Internal Reflection Fluorescence ◽  
Magnetic Field Effects ◽  
Field Effects

Using total internal reflection fluorescence microscopy the effects of applied magnetic fields on radical pair reactions can be sensitively measured from sample volumes as low as ∼100 fL.

Time-resolved studies of radical pairs

2009 ◽  
Vol 37 (2) ◽  
pp. 358-362 ◽  
Author(s):  
Jonathan R. Woodward ◽  
Timothy J. Foster ◽  
Alex R. Jones ◽  
Adrian T. Salaoru ◽  
Nigel S. Scrutton
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Chemical Reactions ◽  
Radical Pair ◽  
Radical Pair Mechanism ◽  
Magnetic Field Effects ◽  
Radical Pairs ◽  
Time Resolved ◽  
Field Effects ◽  
Field Sensitivity

The effect of magnetic fields on chemical reactions through the RP (radical pair) mechanism is well established, but there are few examples, in the literature, of biological reactions that proceed through RP intermediates and show magnetic field-sensitivity. The present and future relevance of magnetic field effects in biological reactions is discussed.

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.

Magnetic field effects on coenzyme B12- and B6-dependent lysine 5,6-aminomutase: switching of the J-resonance through a kinetically competent radical-pair intermediate

2018 ◽  
Vol 20 (18) ◽  
pp. 13068-13074 ◽  
Author(s):  
Jun-Ru Chen ◽  
Shyue-Chu Ke
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Exchange Interaction ◽  
Radical Pair ◽  
Coenzyme B12 ◽  
Spin States ◽  
Magnetic Field Effects ◽  
Field Effects

External magnetic fields interact with lysine 5,6-aminomutase, through an immobilized radical-pair with constant and large exchange interaction, to switch on J-resonance between singlet and triplet spin states, which have different reactive fates.

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