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MR imaging of proton beam-induced oxygen depletion.
Med Phys
January 2025
OncoRay - National Center for Radiation Research in Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany.
Background: Previous studies have shown that in-beam magnetic resonance imaging (MRI) can be used to visualize a proton beam during the irradiation of liquid-filled phantoms. The beam energy- and current-dependent local image contrast observed in water was identified to be predominantly caused by beam-induced buoyant convection and associated flow effects. Besides this flow dependency, the MR signal change was found to be characterized by a change in the relaxation time of water, hinting at a radiochemical contribution, which was hypothesized to lie in oxygen depletion-evoked relaxation time lengthening.
View Article and Find Full Text PDFEffects of in situ Selenium Exposure and Maternal Transfer on Survival and Abnormalities of Yellowstone Cutthroat Trout (oncorhynchus clarkii bouvieri) Fry.
Integr Environ Assess Manag
January 2025
Formation Environmental, Boulder, CO, USA.
Offspring of adult Yellowstone cutthroat trout (YCT) exposed to a range of selenium (Se) concentrations in situ were reared in a laboratory setting to assess effects on survival, growth and abnormalities. Maternal whole body Se concentrations ranged from 2.6 to 25.
View Article and Find Full Text PDFEvidence for the anxiolytic- and antidepressant-like effects of three semi-synthetic derivatives of xylopic acid in mice.
Naunyn Schmiedebergs Arch Pharmacol
January 2025
Department of Pharmacology and Toxicology, School of Pharmacy, University of Health and Allied Sciences, Ho, Ghana.
Purpose: Major depressive disorder is one of the most common and burdensome psychiatric disorders worldwide. This study evaluated the anxiolytic- and antidepressant-like activity of three semi-synthetic derivatives of xylopic acid (XA) to identify the most promising derivative based on mechanism(s) of action, in vivo pharmacokinetics and in vitro cytotoxicity.
Methods: The anxiolytic potential and the involvement of GABAergic mechanisms were assessed in the elevated plus-maze and open field tests in mice.
Box-Behnken Based Furosemide-Nanostructured Lipid Carriers (NLCs) Delivery System for Improving Oral Bioavailability.
Drug Dev Ind Pharm
January 2025
Department of Pharmacy, Quaid-i-Azam University, Islamabad 44000, Pakistan.
Objective: The fabrication of furosemide (FSM) with enhanced oral bioavailability and encapsulation was achieved using a nanostructured lipid carriers (NLCs) drug delivery system.: The uniform drug distribution is a barrier due to its low dose. The lipid-based delivery system was selected based on its poor solubility and permeability, limiting its poor partitioning and solubility in water-based polymeric delivery systems.
View Article and Find Full Text PDFCombining Hyperpolarized Xe MR Imaging and Spectroscopy to Non-Invasively Estimate Pulmonary Vascular Resistance.
J Appl Physiol (1985)
January 2025
Medical Physics Graduate Program, Duke University, Durham, North Carolina, United States.
Hyperpolarized Xe MRI/MRS enables quantitative mapping of function in lung airspaces, membrane tissue, and red blood cells (RBCs) within the pulmonary capillaries. The RBC signal also exhibits cardiogenic oscillations that are reduced in pre-capillary pulmonary hypertension (PH). This effect is obscured in patients with concomitant defects in transfer from airspaces to RBCs, which increase RBC oscillation amplitudes.
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