Application of spin trapping to probe the radical-pair model in magnetic-field-dependent photoreduction of naphthoquinone in SDS micellar solution

1985 ◽  
Vol 107 (24) ◽  
pp. 7214-7216 ◽  
Author(s):  
Masaharu Okazaki ◽  
Shigeru Sakata ◽  
Ryusei Konaka ◽  
Takeshi Shiga
Keyword(s):  
Magnetic Field ◽  
Micellar Solution ◽  
Radical Pair ◽  
Spin Trapping ◽  
Pair Model ◽  
Field Dependent

Magnetic field dependent yield of geminate radical pair recombination in micelles

1994 ◽  
Vol 189 (3) ◽  
pp. 479-487 ◽  
Author(s):  
J.Boiden Pedersen ◽  
A.I. Shushin ◽  
Jørgen S. Jørgensen
Keyword(s):  
Magnetic Field ◽  
Radical Pair ◽  
Field Dependent

scholarly journals Light-dependent magnetoreception in birds: the crucial step occurs in the dark

2016 ◽  
Vol 13 (118) ◽  
pp. 20151010 ◽  
Author(s):  
Roswitha Wiltschko ◽  
Margaret Ahmad ◽  
Christine Nießner ◽  
Dennis Gehring ◽  
Wolfgang Wiltschko
Keyword(s):  
Magnetic Field ◽  
Flavin Adenine Dinucleotide ◽  
Radical Pair ◽  
Magnetic Compass ◽  
Radical Pairs ◽  
Intermittent Light ◽  
Pair Model ◽  
Dark Interval ◽  
Behavioural Experiments ◽  
The Magnetic Field

The Radical Pair Model proposes that the avian magnetic compass is based on spin-chemical processes: since the ratio between the two spin states singlet and triplet of radical pairs depends on their alignment in the magnetic field, it can provide information on magnetic directions. Cryptochromes, blue light-absorbing flavoproteins, with flavin adenine dinucleotide as chromophore, are suggested as molecules forming the radical pairs underlying magnetoreception. When activated by light, cryptochromes undergo a redox cycle, in the course of which radical pairs are generated during photo-reduction as well as during light-independent re-oxidation. This raised the question as to which radical pair is crucial for mediating magnetic directions. Here, we present the results from behavioural experiments with intermittent light and magnetic field pulses that clearly show that magnetoreception is possible in the dark interval, pointing to the radical pair formed during flavin re-oxidation. This differs from the mechanism considered for cryptochrome signalling the presence of light and rules out most current models of an avian magnetic compass based on the radical pair generated during photo-reduction. Using the radical pair formed during re-oxidation may represent a specific adaptation of the avian magnetic compass.

Product yield‐detected ESR on magnetic field‐dependent photoreduction of quinones in SDS micellar solution

1987 ◽  
Vol 86 (12) ◽  
pp. 6792-6800 ◽  
Author(s):  
M. Okazaki ◽  
S. Sakata ◽  
R. Konaka ◽  
T. Shiga
Keyword(s):  
Magnetic Field ◽  
Micellar Solution ◽  
Product Yield ◽  
Field Dependent

Magnetic-field-dependent spin adduct yield in the photoreduction of naphthoquinones in SDS micellar solution

1987 ◽  
Vol 91 (5) ◽  
pp. 1131-1137 ◽  
Author(s):  
Masaharu. Okazaki ◽  
Shigeru. Sakata ◽  
Ryusei. Konaka ◽  
Takeshi. Shiga
Keyword(s):  
Magnetic Field ◽  
Micellar Solution ◽  
Spin Adduct ◽  
Field Dependent

Relativistic Interactions in the Radical Pair Model of Magnetic Field Sense in CRY-1 Protein ofArabidopsis thaliana

2009 ◽  
Vol 113 (44) ◽  
pp. 12276-12284 ◽  
Author(s):  
Artur F. Izmaylov ◽  
John C. Tully ◽  
Michael J. Frisch
Keyword(s):  
Magnetic Field ◽  
Radical Pair ◽  
Pair Model ◽  
Ofarabidopsis Thaliana

scholarly journals Very weak oscillating magnetic field disrupts the magnetic compass of songbird migrants

2017 ◽  
Vol 14 (133) ◽  
pp. 20170364 ◽  
Author(s):  
Alexander Pakhomov ◽  
Julia Bojarinova ◽  
Roman Cherbunin ◽  
Raisa Chetverikova ◽  
Philipp S. Grigoryev ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Narrow Band ◽  
Radical Pair ◽  
Magnetic Compass ◽  
Sensitivity Threshold ◽  
Erithacus Rubecula ◽  
Long Distance ◽  
Pair Model ◽  
Oscillating Magnetic Field ◽  
Sylvia Borin

Previously, it has been shown that long-distance migrants, garden warblers ( Sylvia borin ), were disoriented in the presence of narrow-band oscillating magnetic field (1.403 MHz OMF, 190 nT) during autumn migration. This agrees with the data of previous experiments with European robins ( Erithacus rubecula ). In this study, we report the results of experiments with garden warblers tested under a 1.403 MHz OMF with various amplitudes (∼0.4, 1, ∼2.4, 7 and 20 nT). We found that the ability of garden warblers to orient in round arenas using the magnetic compass could be disrupted by a very weak oscillating field, such as an approximate 2.4, 7 and 20 nT OMF, but not by an OMF with an approximate 0.4 nT amplitude. The results of the present study indicate that the sensitivity threshold of the magnetic compass to the OMF lies around 2–3 nT, while in experiments with European robins the birds were disoriented in a 15 nT OMF but could choose the appropriate migratory direction when a 5 nT OMF was added to the stationary magnetic field. The radical-pair model, one of the mainstream theories of avian magnetoreception, cannot explain the sensitivity to such a low-intensity OMF, and therefore, it needs further refinement.

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