نتایج جستجو برای: electron paramagnetic resonance epr

تعداد نتایج: 517061  

2007
S. Hill A. Wilson

Recent electron paramagnetic resonance (EPR) and magnetic hysteresis experiments have demonstrated quantum entanglement between singlemolecule magnets in a supramolecular [Mn412 dimer. Here we outline details of the computational methods used to calculate the EPR spectrum for the dimer system, with particular emphasis on the symmetries of the entangled eigenstates and the resultant EPR transiti...

Journal: :The Journal of organic chemistry 2012
Claudia Höbartner Giuseppe Sicoli Falk Wachowius Dnyaneshwar B Gophane Snorri Th Sigurdsson

The nitroxide-containing nucleoside Çm is reported as the first rigid spin label for paramagnetic modification of RNA by solid-phase synthesis. The spin label is well accommodated in several RNA secondary structures as judged by its minor effect on the thermodynamic stability of hairpin and duplex RNA. Electron paramagnetic resonance (EPR) spectroscopic characterization of mono-, bi-, and trimo...

2006
MIRELA BRASOVEANU MARIA NICOLETA GRECU MONICA R. NEMTANU

Electron paramagnetic resonance (EPR) is a well-known method for its sensitivity and accuracy in irradiated food detection. Our goal is to analyse the irradiated green coffee by EPR. Arabica beans and grounded coffee was electron beam irradiated up to 40 kGy. The EPR spectra and time dependence of signals were studied. Results were analysed with respect to find a possibility to identify irradia...

2016
Silvia Valera Katrin Ackermann Christos Pliotas Hexian Huang James H Naismith Bela E Bode

Pulse electron paramagnetic resonance (EPR) is gaining increasing importance in structural biology. The PELDOR (pulsed electron-electron double resonance) method allows extracting distance information on the nanometer scale. Here, we demonstrate the efficient extraction of distances from multimeric systems such as membrane-embedded ion channels where data analysis is commonly hindered by multi-...

Rock powder of dolomite samples from the Renison mine area of Tasmania, Australia were analyzed by electron paramagnentic resonance spectroscopy (EPR), Atomic Absorption and Mass Spectrometer to identify alteration related to mineralisation. The least-altered dolomite samples, which are not effected by circulation of diagenetic and hydrothermal fluids are characterised by low Mn and Fe and ...

2017
Ryszard Krzyminiewski Bernadeta Dobosz Tomasz Kubiak

Ceruloplasmin and transferrin are proteins which play a potential role in the process of breast cancer development. These molecules contain Cu2+ (ceruloplasmin) or Fe3+ ions (transferrin) and thus constitute paramagnetic centers, which can be studied using electron paramagnetic resonance method. The aim of the study was to determine how paramagnetic centers in whole blood of breast cancer patie...

Journal: :Microelectronics Reliability 2007
Patrick M. Lenahan

The physical and chemical nature of several defects involved in metal–oxide–silicon (MOS) device instabilities have become fairly well understood through studies involving electron paramagnetic resonance (EPR). Recent EPR studies suggest that some of these defects play important roles in the negative bias temperature instability (NBTI). This paper reviews recent NBTI EPR studies as well as earl...

Journal: :Physical Chemistry Chemical Physics 2021

A 16-line pattern has been theoretically predicted, but hitherto not reported, for the Electron Paramagnetic Resonance (EPR) spectrum of antiferromagnetically coupled CuII triangles experiencing isotropic exchange isosceles magnetic symmetry.

2010
A. V. Fionov Anders Lund Weimin Chen N. N. Rozhkova Irina Buyanova

Dispersed detonation nanodiamonds have been studied by continuous-wave (CW) and pulse EPR techniques. The spectrum of bulk radicals (g = 2.0025 ± 0.0002, a Lorentz line shape with ΔHpp = 0.95 ± 0.05 mT) dominated in CW EPR and prevented to record spectra from other paramagnetic species. The pulse EPR spectrum was the superposition of the distorted P1-center spectrum with parameters (g = 2.0025,...

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