scholarly journals Application of Numerical Analysis of the Shape of Electron Paramagnetic Resonance Spectra for Determination of the Number of Different Groups of Radicals in the Burn Wounds

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Paweł Olczyk ◽  
Katarzyna Komosinska-Vassev ◽  
Paweł Ramos ◽  
Łukasz Mencner ◽  
Krystyna Olczyk ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Repair Process ◽  
Spectral Shape ◽  
Dipolar Interactions ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Burn Wounds ◽  
Best Fitting ◽  
Electron Paramagnetic

Background. The evidence exists that radicals are crucial agents necessary for the wound regeneration helping to enhance the repair process. Materials and methods. The lineshape of the electron paramagnetic resonance (EPR) spectra of the burn wounds measured with the low microwave power (2.2 mW) was numerically analyzed. The experimental spectra were fitted by the sum of two and three lines. Results. The number of the lines in the EPR spectrum corresponded to the number of different groups of radicals in the natural samples after thermal treatment. The component lines were described by Gaussian and Lorentzian functions. The spectra of the burn wounds were superposition of three lines different in shape and in linewidths. The best fitting was obtained for the sum of broad Gaussian, broad Lorentzian, and narrow Lorentzian lines. Dipolar interactions between the unpaired electrons widened the broad Gaussian and broad Lorentzian lines. Radicals with the narrow Lorentzian lines existed mainly in the tested samples. Conclusions. The spectral shape analysis may be proposed as a useful method for determining the number of different groups of radicals in the burn wounds.

Determination of the Stoichiometry of the Adducts Formed between some Heterocyclic Bases and Copper(II) Bis(diethyldithiocarbamate) in Various Solvents

1973 ◽  
Vol 51 (10) ◽  
pp. 1530-1534 ◽  
Author(s):  
J. B. Farmer ◽  
F. G. Herring ◽  
R. L. Tapping
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Paramagnetic Resonance ◽  
Benzene Toluene ◽  
Heterocyclic Bases ◽  
Electron Paramagnetic

The stoichiometry of the adducts formed between copper(II) bis(diethyldithiocarbamate) and pyridine in benzene, toluene, and chloroform and between 3-picoline, 4-picoline, and 3,4-lutidine in benzene are shown to be 1:1. The method employed is that of Scatchard using electron paramagnetic resonance studies.

Spin reorientation transition and spin dynamics study of perovskite orthoferrite TmFeO3 detected by electron paramagnetic resonance

2020 ◽  
Vol 22 (37) ◽  
pp. 21403-21411
Author(s):  
Poorva Sharma ◽  
Jiyu Fan ◽  
Ashwini Kumar ◽  
Arvind Yogi ◽  
Yisheng Chai ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Spin Dynamics ◽  
Spin Reorientation ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Spin Reorientation Transition ◽  
Different Temperatures ◽  
Electron Paramagnetic

(Right) EPR spectrum of TmFeO3 from 20–300 K. (Left) (a) Asymmetry behavior w.r.t. temperature (K), (b) ΔHppvs. T, (c) Plot as ln(ΔHpp × T) vs. 1000/T, (d) DIN (inset represents χdcvs. T at different temperatures).

scholarly journals Concentration of Fe(3+)-Triapine in BEAS-2B Cells

2019 ◽  
Vol 20 (12) ◽  
pp. 3062 ◽  
Author(s):  
William E. Antholine ◽  
Charles R. Myers
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Tumor Cells ◽  
Iron Uptake ◽  
Antitumor Agent ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Epr Method ◽  
First Time ◽  
Electron Paramagnetic ◽  
In Cells

An electron paramagnetic resonance (EPR) method was used to determine the concentration of the antitumor agent Triapine in BEAS-2B cells when Triapine was bound to iron (Fe). Knowledge of the concentration of Fe-Triapine in tumor cells may be useful to adjust the administration of the drug or to adjust iron uptake in tumor cells. An EPR spectrum is obtained for Fe(3+)-Triapine, Fe(3+)(Tp)2+, in BEAS-2B cells after addition of Fe(3+)(Tp)2+. Detection of the low spin signal for Fe(3+)(Tp)2+ shows that the Fe(3+)(Tp)2+ complex is intact in these cells. It is proposed that Triapine acquires iron from transferrin in cells including tumor cells. Here, it is shown that iron from purified Fe-transferrin is transferred to Triapine after the addition of ascorbate. To our knowledge, this is the first time that the EPR method has been used to determine the concentration of an iron antitumor agent in cells.

An Experimental Technique for Studying Chemisorption Reactions by Means of Electron Paramagnetic Resonance Spectroscopy

1972 ◽  
Vol 26 (2) ◽  
pp. 239-241 ◽  
Author(s):  
Eugene P. Scheide ◽  
George G. Guilbault
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Experimental Method ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Cupric Chloride ◽  
Resonance Spectroscopy ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Before And After ◽  
Chemisorption Bond ◽  
Electron Paramagnetic

A new experimental method and a specially designed EPR cell are described for use in the study of chemisorption reactions. By studying the EPR spectrum of a surface both before and after chemisorption, it can be shown whether unpaired d electrons are used in the chemisorption bond and the nature of this bond. The EPR spectra of a cupric chloride surface, both before and after a gaseous ligand (diisopropyl methyl phosphonate) is chemisorbed, are shown and the results are interpreted in terms of the type of bond formed.

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