scholarly journals The probable site of action of thenolytrifluoracetone on the respiratory chain

1977 ◽  
Vol 164 (3) ◽  
pp. 617-620 ◽  
Author(s):  
W J Ingledew ◽  
T Ohnishi
Keyword(s):  
Succinate Dehydrogenase ◽  
Respiratory Chain ◽  
Close Association ◽  
Succinate Oxidation ◽  
Paramagnetic Resonance ◽  
Spin Interactions ◽  
Site Of Action ◽  
Transfer Inhibitor ◽  
Probable Site ◽  
Electron Paramagnetic

1. It is shown that the electron-transfer inhibitor thenoyltrifluoroacetone abolishes a respiratory-chain electron-paramagnetic-resonance absorbance due to spin-spin interactions of ubisemiquinones at concentrations similar to those required for inhibition of succinate oxidation. 2. A specific site of interaction of thenoyltrifluoroacetone with the respiratory chain is proposed to be on the ubisemiquinone with which succinate dehydrogenase reacts. 3. Our results further demonstrate the close association of the HiPIP (high-potential iron-sulphur) centre of succinate dehydrogenase with ubisemiquinone.

scholarly journals Thermodynamic and electron paramagnetic resonance characterization of flavin in succinate dehydrogenase.

1981 ◽  
Vol 256 (11) ◽  
pp. 5577-5582
Author(s):  
T. Ohnishi ◽  
T.E. King ◽  
J.C. Salerno ◽  
H. Blum ◽  
J.R. Bowyer ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Succinate Dehydrogenase ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

Spin Interactions in Cd1-xMnxS Bulk Crystals

2005 ◽  
Vol 494 ◽  
pp. 271-276
Author(s):  
D. Milivojević ◽  
B. Babić-Stojić
Keyword(s):  
High Temperature ◽  
Dipolar Interaction ◽  
Spin Orbit Coupling ◽  
Bulk Crystals ◽  
Paramagnetic Resonance ◽  
Spin Interactions ◽  
Magnetic Dipolar Interaction ◽  
High Temperature Data ◽  
Electron Paramagnetic ◽  
Infinite Temperature

Electron paramagnetic resonance (EPR) linewidth in the Cd1-xMnxS bulk crystals with manganese concentrations x = 0.25, 0.33, 0.35 and 0.42 has been studied in the high-temperature region. An analysis of the infinite-temperature EPR linewidth performed within the exchange narrowing model shows that the contributions of the anisotropic superexchange and magnetic dipolar interaction to the linewidth are nearly the same due to weak anion spin-orbit coupling. The single-ion anisotropy originating from the crystal field of axial symmetry with the parameter Dsingle= 0.0295 cm-1, as observed in some CdS:Mn crystals, gives a contribution to the linewidth comparable with the influence of the anisotropic superexchange and magnetic dipolar interaction. The calculated infinite-temperature linewidths, including all anisotropic spin interactions examined in this work, are close to the experimental infinite-temperature linewidths estimated from the existing high-temperature data.

Effects of Possible Spin-Spin Interactions on EPR spectra of Cu2+ exchanged Faujasite–X (I)

2005 ◽  
Vol 900 ◽  
Author(s):  
Chrispin B. O. Kowenje ◽  
Barry R. Jones ◽  
Charles W. Kanyi
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Continuous Wave ◽  
Recent Literature ◽  
Epr Spectra ◽  
Spin Hamiltonian ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Spin Interactions ◽  
Electron Paramagnetic

ABSTRACTThe interpretation of the continuous wave electron paramagnetic resonance (CW-EPR) spectra of Cu2+ exchanged in Faujasite zeolite is not straightforward. Recent literature points to the role of both Cu2+ zeolite sites and Cu2+ relationship to lattice Al in determining the parameters of Cu2+ spin Hamiltonian. Our work shows that at low concentration, Cu2+ EPR signals show negligible spin-spin interactions. At higher Cu (II) concentrations, a third CW-EPR spectrum that has contributions from both the CW-EPR and the spin-spin interactions, appears.

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