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Arriving at the most plausible interpretation of the dielectric spectra of glycerol with help from quasielastic γ-ray scattering time-domain interferometry.
Phys Rev E
May 2022
Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86135 Augsburg, Germany.
Glycerol is one of the glass-forming liquids selected by Robert H. Cole in 1950 to start his study of molecular dynamics by dielectric spectroscopy. Seventy-one years have gone by and remarkably no consensus has been reached on the nature and identity of the relaxation processes observed in the dielectric spectra.
View Article and Find Full Text PDFParamagnetic resonance investigation of mono- and di-manganese-containing systems in biochemistry.
Methods Enzymol
April 2022
Department of Biological, Physical and Health Sciences, College of Science, Health and Pharmacy, Roosevelt University, Chicago, IL, United States. Electronic address:
Although not as important as iron, manganese is one of the key transition metal (d block) elements in biochemistry. The role of Mn in photosynthesis is perhaps its "starring role," but has been extensively covered elsewhere and will not be discussed in this chapter. In contrast to iron, for which Fe Mӧssbauer effect (nuclear gamma resonance) spectroscopy is available, Mn (100% abundant) lacks this ability.
View Article and Find Full Text PDFMössbauer Studies of Narrow Fractions of Fly Ash Formed after Combustion of Ekibastuz Coal.
Materials (Basel)
December 2021
Kazakh National Agrarian Research University, Abai Av. 8, Almaty 050010, Kazakhstan.
Nuclear gamma-resonance spectroscopy on Fe nuclei, X-ray diffraction, and scanning electron microscopy have been used to study the narrow fractions of fly ash formed after combustion of the Ekibastuz coal. Two groups of samples of magnetic (ferrospheres) and non-magnetic type have been separated by granulometric and magnetic separation. A number of regularities associated with the granules size of fly ash have been established.
View Article and Find Full Text PDFMicroscopic understanding of the Johari-Goldstein β relaxation gained from nuclear γ-resonance time-domain-interferometry experiments.
Phys Rev E
July 2021
CNR-IPCF, Largo B. Pontecorvo 3, I-56127 Pisa, Italy.
Traditionally the study of dynamics of glass-forming materials has been focused on the structural α relaxation. However, in recent years experimental evidence has revealed that a secondary β relaxation belonging to a special class, called the Johari-Goldstein (JG) β relaxation, has properties strongly linked to the primary α relaxation. By invoking the principle of causality, the relation implies the JG β relaxation is fundamental and indispensable for generating the α relaxation, and the properties of the latter are inherited from the former.
View Article and Find Full Text PDFLong-Chain Fatty Acids in Bones and Their Link to Submicroscopic Vascularization Network: NMR Assignment and Relaxation Studies under Magic Angle Spinning Conditions in Intramuscular Bones of Atlantic Herring Fish.
J Phys Chem B
May 2021
Department of Physical Therapy, The College of Staten Island, 2800 Victory Blvd, Staten Island, New York 10314, United States.
The long-lasting proton signals in bones are identified as long-chain fatty acids, including saturated, mono-, and di-unsaturated fatty acids, with direct nuclear magnetic resonance evidence. We used intramuscular bones from Atlantic Herring fish to avoid interference from lipid-rich marrows. The key is to recognize that these signals are from mobile phase materials and study them with -coupled correlation spectroscopies under magic angle spinning conditions.
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