The positive muon and μSR spectroscopy: powerful tools for investigating the structure and dynamics of free radicals and spin probes in complex systems

2013 ◽  
Vol 109 ◽  
pp. 65 ◽  
Author(s):  
Iain McKenzie
Keyword(s):  
Free Radicals ◽  
Complex Systems ◽  
Positive Muon ◽  
Spin Probes ◽  
Structure And Dynamics

scholarly journals An EPR spin-probe and spin-trap study of the free radicals produced by plant plasma membranes

2005 ◽  
Vol 70 (2) ◽  
pp. 177-186 ◽  
Author(s):  
Milos Mojovic ◽  
Ivan Spasojevic ◽  
Mirjana Vuletic ◽  
Zeljko Vucinic ◽  
Goran Bacic
Keyword(s):  
Cell Wall ◽  
Free Radicals ◽  
Hydroxyl Radicals ◽  
Spin Probe ◽  
Plasma Membranes ◽  
Spin Trap ◽  
Spectroscopic Techniques ◽  
Spin Probes ◽  
Diphenylene Iodonium ◽  
Kinetics Of

Plant plasma membranes are known to produce superoxide radicals, while the production of hydroxyl radical is thought to occur only in the cell wall. In this work it was demonstrated using combined spin-trap and spin-probe EPR spectroscopic techniques, that plant plasma membranes do produce superoxide and hydroxyl radicals but by kinetically different mechanisms. The results show that superoxide and hydroxyl radicals can be detected by DMPO spin-trap and that the mechanisms and location of their production can be differentiated using the reduction of spin-probes Tempone and 7-DS. It was shown that the mechanism of production of oxygen reactive species is NADH dependent and diphenylene iodonium inhibited. The kinetics of the reduction of Tempone, combined with scavengers or the absence of NADH indicates that hydroxyl radicals are produced by a mechanism independent of that of superoxide production. It was shown that a combination of the spin-probe and spin-trap technique can be used in free radical studies of biological systems, with a number of advantages inherent to them.

Surface-adsorbed free radicals observed by positive-muon avoided-level-crossing resonance

Nature ◽  
1990 ◽  
Vol 345 (6273) ◽  
pp. 328-330 ◽  
Author(s):  
Ivan D. Reid ◽  
Toshiyuki Azuma ◽  
Emil Roduner
Keyword(s):  
Free Radicals ◽  
Positive Muon ◽  
Level Crossing
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