Instrumental effects in homodyne electron paramagnetic resonance spectrometers

Electron paramagnetic resonance (EPR) spectroscopy for investigating murine telogen skin after spontaneous or depilation-induced hair growth

“…The geometry of EPR assay was preserved for all samples both of unshaven skin and hair shafts. It was achieved by applying in each measurement session: (i) the same Dewar flask, (ii) the same position of the inserted Dewar flask and the sample according to the modulation field, and (iii) the same geometry (length and diameter) of the samples [45,46].…”

C and N stocks and the role of molecular recalcitrance and organomineral interaction in stabilizing soil organic matter in a subtropical Acrisol managed under no-tillage

“…This experiment was based on the principle that with stronger organomineral interaction, an excited electron spin system can more easily transfer its energy to surroundings (i.e., to minerals), its spin-lattice relaxation time is shorter and thus microwave power to cause ESR signal saturation must be higher (Czoch and Francik, 1989). Experimentally, the sample is submitted to increasingly high microwave power levels and the corresponding ESR signal intensities are recorded.…”

Electron paramagnetic resonance as a unique tool for skin and hair research

“…Detectability of paramagnetic centres is given by a superposition of physical and instrumental limitations (172,173) and it remains in opposition to the biological properties of the measured samples. In EPR spectroscopy of biological objects, the necessity to compromise between various tendencies and phenomena acting against each other has become a kind of art; that is, to portray some of such perplexities is the best way to make them resolvable in particular experiments.…”