Saturation-transfer electron spin resonance studies on the mobility of spin-labeled sodium and potassium ion activated adenosine triphosphatase in membranes from Squalus acanthias

Biochemistry ◽  
1987 ◽  
Vol 26 (26) ◽  
pp. 8675-8683 ◽  
Author(s):  
Mikael Esmann ◽  
Laszlo I. Horvath ◽  
Derek Marsh
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Adenosine Triphosphatase ◽  
Potassium Ion ◽  
Squalus Acanthias ◽  
Saturation Transfer ◽  
Spin Resonance ◽  
Sodium And Potassium

A Study of Cation-exchange Reactions in the System Potassium Durosemiquinone – Potassium Tetraphenylboride – Tetrahydrofuran

1971 ◽  
Vol 49 (9) ◽  
pp. 1529-1538 ◽  
Author(s):  
T. E. Gough ◽  
P. R. Hindle
Keyword(s):  
Electron Spin Resonance ◽  
Spectral Line ◽  
Cation Exchange ◽  
Line Width ◽  
Electron Spin ◽  
Potassium Ion ◽  
Exchange Reactions ◽  
Line Shapes ◽  
Intramolecular Exchange ◽  
Spin Resonance

The electron spin resonance (e.s.r.) spectrum of potassium durosemiquinone in tetrahydrofuran has been studied as a function of temperature and found to exhibit line-width alternation indicating the presence of an intramolecular migration of the potassium ion between the oxygens of the semiquinone. The addition of potassium tetraphenylboride to the system produces intermolecular scrambling of potassium, the spectral effects of which are superimposed upon those of the intramolecular exchange. From the spectral line-shapes approximate values of the activation energies and frequency factors were derived. The tetraphenylboride anion did not play a detectable role in the various exchange mechanisms.

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