Foundations of Modern EPR

Eaton, Gareth R.; Salikhov, K. M.

doi:10.1142/3624

Cited by 93 publications

(132 citation statements)

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“…Paramagnetic centers with unpaired electrons reveal high chemical activity in tissues [7][8][9][10][11][12][13]. Paramagnetic centers may change the properties of dental materials during storage, which is the Effect of microwave power on EPR spectra of natural and synthetic dental biocompatible materials negative effect because the chemical structure of materials for stomatology should be stable.…”

Section: Introductionmentioning

confidence: 99%

Effect of microwave power on EPR spectra of natural and synthetic dental biocompatible materials

2015

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Abstract. Paramagnetic centers in the two exemplary synthetic and natural dental biocompatible materials applied in implantology were examined by the use of an X-band (9.3 GHz) electron paramagnetic resonance (EPR) spectroscopy. The EPR spectra were measured in the range of microwave power 2.2-70 mW. The aims of this work were to compare paramagnetic centers concentrations in different dental biocompatible materials and to determine the effect of microwave power on parameters of their EPR spectra. It is the very fi rst and innovatory examination of paramagnetic centers in these materials. It was pointed out that paramagnetic centers existed in both natural (~10 18 spin/g) and synthetic (~10 19 spin/g) dental biocompatible materials, but the lower free radical concentration characterized the natural sample. Continuous microwave saturation of EPR spectra indicated that faster spin-lattice relaxation processes existed in synthetic dental biocompatible materials than in natural material. Linewidths (B pp ) of the EPR spectra of the natural dental material slightly increased for the higher microwave powers. Such effect was not observed for the synthetic material. The broad EPR lines (B pp ): 2.4 mT, 3.9 mT, were measured for the natural and synthetic dental materials, respectively. Probably strong dipolar interactions between paramagnetic centers in the studied samples may be responsible for their line broadening. EPR spectroscopy is the useful experimental method in the examination of paramagnetic centers in dental biocompatible materials.

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Section: Introductionmentioning

confidence: 99%

Effect of microwave power on EPR spectra of natural and synthetic dental biocompatible materials

2015

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“…The discovery of the electron spin has long been associated with the "anomalous" Zeeman effect in the atomic spectra of hydrogen 1,2 and with the deflection of an atomic beam of silver atoms in the Stern-Gerlach experiment. 3 In semiconductors the Zeeman effect has been first studied on the optical spectra of acceptor impurities in bulk germanium and, subsequently, on the optical spectra of excitons in bulk and in semiconductor heterostructures.…”

Section: Introductionmentioning

confidence: 99%

Intertwining of Zeeman and Coulomb interactions on excitons in highly symmetric semiconductor quantum dots

Oberli

2012

Phys. Rev. B

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We present an experimental study and develop a group theoretical analysis of the Zeeman effect on excitons in pyramidal semiconductor quantum dots possessing the symmetries of the C 3v point group. The magnetic field dependence of the emission pattern originating from neutral exciton states is investigated in both the Faraday and Voigt configurations. The Zeeman doublet splitting of the "bright" exciton states varies linearly with the magnetic field strength in each configuration while the intensity of the "dark" exciton transitions exhibit a nonlinear dependence. We demonstrate that these observations originate from the intertwining of the Zeeman and Coulomb interactions, which provides clear spectral signatures of this effect for highly symmetric quantum dots. We uncover a large anisotropy of the Zeeman doublet splittings for longitudinal and transverse magnetic fields, revealing the ubiquitous role of a symmetry elevation in our pyramidal quantum dots. These results suggest that the common description of the Zeeman effect based on effective g factors for electrons and holes must be revised when dealing with exciton complexes.

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“…Many books and journal articles have attempted to make the technique accessible to life sciences. [67][68][69][70] A concise description of continuous-wave (CW) EPR and spin labels is offered below.…”

Section: Electron Paramagnetic Resonance (Epr)mentioning

confidence: 99%

“…Initially, EPR was nearly exclusively used to characterize transition metals but fell out of favor due to its complexity. 67 As a result of the ability to add spin labels and, subsequently, a lone electron onto polypeptides, the technique has experienced a renaissance within structural biology research. 70 X-ray crystallography has been lauded as the gold standard for protein architectural studies, however, this technique provides only structural data in the conditions of the crystal.…”

Section: Epr Overviewmentioning

confidence: 99%

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Cloning, Expression, and Biophysical Investigations of Truncated Inclusion Protein A (IncA) from Chlamydia trachomatis

Campbell

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ii To my mom and dad, who gave me a thirst for knowledge and the desire to learn.iii Acknowledgements I would like to thank Dr. Linda Columbus for allowing me to work in her lab, study inclusion proteins, and pushing my limits.Thank you Columbus and Mura Lab members for all their technical assistance and feedback.Dr. John D. Shannon for his incredible patience and assistance with MALDI-TOF MS and circular dichroism.Many thanks to Jessica Sarver in the Cafiso lab for allowing me to think out loud about EPR.Thank you to Sandy, Vicki, and Kevin in Facilities Management who kept me laughing, updated me on the news and "goings on" in the department in the "wee" hours of the morning.Special thanks to Tsega Solomon who gave me invaluable technical advice, interesting philosophical debates over lunch, and a renewed interest in shopping. How I will miss you! Special thanks to Dr. Kim Bassett for her listening ear and unconditional friendship. demonstrated the hexa-histidine tag disrupted dimer formation; however, after cleavage of the tag with thrombin, dimer was reformed. Circular dichroism of the construct confirmed the dimer was all α-helical as expected for a SNARE motif. Finally, two single cysteine mutants were prepared and spin-labeled. Continuous wave electron paramagnetic resonance confirmed the sites were spin-labeled and the lineshapes were consistent with moderately immobilized spin labels expected for a tertiary contact. Future double electronelectron resonance experiments will measure the distance between the spin labels, which will elucidate the dimer orientation.

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Foundations of Modern EPR

Cited by 93 publications

References 0 publications

Effect of microwave power on EPR spectra of natural and synthetic dental biocompatible materials

Effect of microwave power on EPR spectra of natural and synthetic dental biocompatible materials

Intertwining of Zeeman and Coulomb interactions on excitons in highly symmetric semiconductor quantum dots

Cloning, Expression, and Biophysical Investigations of Truncated Inclusion Protein A (IncA) from Chlamydia trachomatis

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