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Portable, low-field magnetic resonance imaging for evaluation of Alzheimer's disease.
Nat Commun
December 2024
Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
Article Synopsis
- Portable low-field magnetic resonance imaging (LF-MRI) offers a promising way to assess Alzheimer's disease (AD) patients in places where traditional MRI isn't available, despite some limitations in image quality.
- * Researchers optimized LF-MRI techniques and created a free machine learning tool for analyzing brain structure and white matter changes in patients with cognitive impairments.
- * The study found that LF-MRI accurately measures hippocampal volumes and white matter hyperintensities, suggesting that this technology can improve access to neuroimaging for dementia patients at a lower cost.
Distinguishing between aquo and hydroxo coordination in molecular copper complexes by H and O ENDOR spectroscopy.
Dalton Trans
January 2025
Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, D-45470 Mülheim an der Ruhr, Germany.
Aquo and hydroxo ligands play an essential role in the chemistry of many copper enzymes and small molecule catalysts. The formation of a series of copper complexes with HO and OH ligands in various positions, including [Cu(bpy)(OAc)(HO)] (Cu-I), [Cu(bpy)(OH)(HO)] (Cu-III), [Cu(OH)(HO)] (Cu-IV), [Cu(bpy)(HO)(HO)] (Cu-V) and [Cu(bpy)(HO)] (Cu-VI), were investigated through Electron Paramagnetic Resonance (EPR) and UV-Vis spectroscopy in aqueous copper bipyridine solutions in the dependence of the pH and the copper-to-bipyridine ratio (bpy = 2,2'-bipyridine). H- and O-enrichment of the copper complexes allowed us to determine the H and O nuclear hyperfine interactions of their HO ligands Q-band Electron Nuclear Double Resonance (ENDOR) spectroscopy.
View Article and Find Full Text PDFProbing Bioinorganic Electron Spin Decoherence Mechanisms with an FeS Metalloprotein.
J Phys Chem B
October 2024
Division of Chemistry and Chemical Engineering, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, United States.
Article Synopsis
- Recent research aims to create paramagnetic molecular qubits to enhance quantum information storage and manipulation, with a focus on understanding electron spin decoherence.
- Insights gained from synthetic systems suggest that using biomolecular platforms can better study decoherence in complex chemical environments, leveraging knowledge from molecular biology.
- This study utilized the FeS active site of putidaredoxin to investigate electron spin decoherence mechanisms, revealing anisotropic decoherence rates and demonstrating the potential for biomolecular quantum sensors through mutation and solvent monitoring.
Spin Dynamics of Radical Pairs Using the Stochastic Schrödinger Equation in .
J Chem Theory Comput
October 2024
Department of Chemistry, University of Oxford, Physical and Theoretical Chemistry Laboratory, Oxford OX1 3QZ, United Kingdom.
The chemical reactivity of radical pairs is strongly influenced by the interactions of electronic and nuclear spins. A detailed understanding of these effects requires a quantum description of the spin dynamics that considers spin-dependent reaction rates, interactions with external magnetic fields, spin-spin interactions, and the loss of spin coherence caused by coupling to a fluctuating environment. Modeling real chemical and biochemical systems, which frequently involve radicals with multinuclear spin systems, poses a severe computational challenge.
View Article and Find Full Text PDFImpact of Zeeman and hyperfine interactions on the magnetic properties of paramagnetic metal Ions: I. Local interactions of the electron spin.
J Magn Reson
August 2024
Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, 420029, Kazan, Russia. Electronic address:
The anisotropic Zeeman interaction of an ion, and the strong hyperfine interaction with its own nucleus, can significantly influence its interactions with the local environment. These effects, including the reduction of the effective magnetic moment of the electron spin and the phase memory decay rate, are studied theoretically. Analytical expressions describing the mean magnetic moment of the electron spin are obtained.
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