scholarly journals Simulation of nitrogen nuclear spin magnetization of liquid solved nitroxides

2021 ◽  
Author(s):  
Andriy Marko ◽  
Antonín Sojka ◽  
Oleksii Laguta ◽  
Petr Neugebauer
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Unpaired Electron ◽  
Nuclear Spin ◽  
Organic Radicals ◽  
Nuclear Spins ◽  
Nitroxide Radicals ◽  
Paramagnetic Resonance ◽  
Spin Magnetization ◽  
Electron Paramagnetic

Nitroxide radicals are widely used in Electron Paramagnetic Resonance (EPR) applications. Nitroxides are stable organic radicals containing ${\rm N-O}^\bullet$ group with hyperfine coupled unpaired electron and nitrogen nuclear spins. In...

Electron paramagnetic resonance study of the nuclear spin dynamics in an AlAs quantum well

JETP Letters ◽  
2016 ◽  
Vol 104 (12) ◽  
pp. 838-841 ◽  
Author(s):  
A. V. Shchepetilnikov ◽  
D. D. Frolov ◽  
Yu. A. Nefyodov ◽  
I. V. Kukushkin ◽  
L. Tiemann ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Quantum Well ◽  
Nuclear Spin ◽  
Spin Dynamics ◽  
Electron Paramagnetic Resonance Study ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

Hyperthermia stimulates nitric oxide formation: electron paramagnetic resonance detection of .NO-heme in blood

1994 ◽  
Vol 77 (2) ◽  
pp. 548-553 ◽  
Author(s):  
D. M. Hall ◽  
G. R. Buettner ◽  
R. D. Matthes ◽  
C. V. Gisolfi
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Unpaired Electron ◽  
Venous Blood ◽  
Whole Body ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Blood Samples ◽  
Arterial Blood ◽  
Hyperfine Splitting Constant ◽  
Electron Paramagnetic

Previous experiments from our laboratory have demonstrated that severe hyperthermia results in a selective loss of splanchnic vasoconstriction. Using electron paramagnetic resonance spectroscopy to scan whole blood samples collected in vivo from the portal vein and femoral artery of conscious unrestrained rats, we observed an increase in the concentration of spectroscopy-detectable species in portal venous blood of all heat-stressed animals. These spectra consisted of at least three distinct species: one with a broad feature having an effective g factor for the unpaired electron (g) of 2.06 assigned to the copper-binding acute phase protein ceruloplasmin, and two with narrower features that evolved at core temperatures > 39 degrees C representing a semiquinone radical and .NO-heme. This heat-induced signal displays the classic nitrogen triplet hyperfine structure (nitrogen hyperfine splitting constant = 17.5 gauss, centered at g = 2.012) that is consistent with a five-coordinate heme complex and is characteristic of an unpaired electron coupled to nitrogen in the ferrous .NO-heme adduct [(alpha 2+NO) beta 3+]2. The intensity of this signal increased approximately twofold as core temperature rose to > 39 degrees C, peaking 1 h post-heat exposure at greater than threefold basal concentration. This species was not seen in corresponding arterial blood samples. This is the first demonstration that whole body hyperthermia produces increased concentrations of radicals and metal binding proteins in the venous blood of the rat and suggests that severe hyperthermia stimulates an enhanced local release of .NO within the splanchnic circulation.

Rapid‐Scan Electron Paramagnetic Resonance of Highly Resolved Hyperfine Lines in Organic Radicals.

ChemPhysChem ◽  
2020 ◽  
Vol 21 (22) ◽  
pp. 2564-2570
Author(s):  
Joseph E. McPeak ◽  
Peter Höfer ◽  
Sylwia Kacprzak ◽  
Patrick Carl ◽  
Ralph Weber ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Organic Radicals ◽  
Paramagnetic Resonance ◽  
Rapid Scan ◽  
Electron Paramagnetic

Applications of EPR Spectrometer in Environmental Samples

2015 ◽  
Vol 1092-1093 ◽  
pp. 589-592
Author(s):  
Shao Hua Liao ◽  
Fang Yang ◽  
Fang Fang Li ◽  
Jing Yang ◽  
Min Wu
Keyword(s):  
Carbon Nanotubes ◽  
Electron Paramagnetic Resonance ◽  
Free Radicals ◽  
Transition Metals ◽  
Environmental Samples ◽  
High Sensitivity ◽  
Organic Radicals ◽  
Paramagnetic Resonance ◽  
Potential Risks ◽  
Electron Paramagnetic

Electron paramagnetic resonance (EPR) spectrometer was widely applied to physics, chemistry and biomedicine. This research provided possible electron and valence information of environmental samples interaction through high sensitivity. The EPR signals of transition metals and organic radicals were distinguished well. Three kinds of carbon nanotubes (CNTs) (MW50, MW30 and MWG) had strong EPR signals. Addition of transition metals may be a suitable way to decrease environmentally persistent free radicals (EPFRs). The potential risks of EPFRs in BC and the reactive free electron in transition metals must be addressed to ensure their safe and scientific absorption application.

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