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Altered Nigral Amide Proton Transfer Imaging Signal Concordant With Motor Asymmetry in Parkinson's Disease: A Multipool CEST MRI Study.
NMR Biomed
February 2025
Department of Radiology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, China.
Asymmetry is a natural characteristic of Parkinson's disease (PD), which can be used to distinguish PD from atypical parkinsonism. Chemical exchange saturation transfer (CEST) has demonstrated value in reflecting the subtle changes related to neuron loss and abnormal protein accumulation in PD but has not been used to investigate asymmetry in PD. This study aimed to examine asymmetrical changes in the mesencephalic nucleus of PD patients with motor asymmetry using four-pool CEST analysis and to explore the relationship between imaging asymmetry and motor asymmetry.
View Article and Find Full Text PDFNitrogen vacancy mediated g-CN/BiVO Z-scheme heterostructure nanostructures for exceptional photocatalytic performance.
Environ Res
December 2024
School of Materials and Chemistry, Analytical and Testing Center, Innovation Center of Nuclear Environmental Safety Technology, Southwest University of Science and Technology, Mianyang, 621010, China. Electronic address:
In this work, a novel V-g-CN/BiVO (V-CN/BVO) Z-scheme heterojunction photocatalyst was formed by introducing nitrogen vacancies (V) and constructing heterojunction, which is able to efficiently degrade the representative contaminant rhodamine B (RhB) upon exposure to visible-light, resulting in an outstanding degradation rate of 98.91% of RhB within 30 min. This photocatalyst exhibits catalytic universality and allows the degradation of methylene blue (MB, 97.
View Article and Find Full Text PDFModelling soil - Vegetation - Atmospheric interactions of radon products in a Belgian Scots pine forest site.
J Environ Radioact
December 2024
Belgian Nuclear Research Centre (SCK CEN), Boeretang 200, 2400, Mol, Belgium.
A soil-vegetation-atmospheric transfer (SVAT) model for radon and its progeny is presented to improve process-level understanding of the role of forests in taking-up radionuclides from soil radon outgassing. A dynamic system of differential equations couples soil, tree (Scots pine) and atmospheric processes, treating the trees as sources, sinks and conduits between the atmosphere and the soil. The model's compartments include a dual-layer soil column undergoing hydrological and solute transport, the tree system (comprising roots, wood, litter, and foliage) and the atmosphere, with physical processes governing the transfers of water and radon products between these compartments.
View Article and Find Full Text PDFMETHODOLOGY OF RECONSTRUCTION OF INTERNAL DOSES FROM 137Cs AND 134Cs OF RESIDENTS OF RADIOACTIVELY CONTAMINATED SETTLEMENTS IN UKRAINE NOT COVERED BY WBC MONITORING.
Probl Radiac Med Radiobiol
December 2024
Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, 9609 Medical Center Drive, Bethesda, MD 20892, USA.
Objective: Scientific justification of the methodology for calculating radiation internal doses from 137Cs and 134Cs intake for residents of Ukrainian settlements radioactively contaminated as a result of the Chornobyl (Chernobyl) accident in which measurements of incorporated radiocesium isotopes in humans using whole-body counters (WBC) were not carried out.
Materials And Methods: The paper presents a new methodology for reconstructing doses due to internal irradiation from Chornobyl fallout for both surface (in 1986) and root (in 1987-2023) contamination of vegetation with 137Cs and 134Cs and their transfer into the human body. The methodology for calculating the dose due to surface contamination of vegetation was based on the theoretical model of the transfer of radiocesium isotopes through the food chain with further adjustment of this model to the results of WBC measurements carried out between 15 July and 31 December 1986.
Radiation-induced aerobic oxidation solvent-derived peroxyl radicals.
Chem Sci
December 2024
Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University Beijing 100871 China
Oxidation is a fundamental transformation in synthesis. Developing facile and effective aerobic oxidation processes under ambient conditions is always in high demand. Benefiting from its high energy and good penetrability, ionizing radiation can readily produce various reactive species to trigger chemical reactions, offering another option for synthesis.
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