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High-level characterization of the OH + CHNH reaction.
Phys Chem Chem Phys
November 2024
MTA-SZTE Lendület "Momentum" Computational Reaction Dynamics Research Group, Interdisciplinary Excellence Centre and Department of Physical Chemistry and Materials Science, Institute of Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged H-6720, Hungary.
The complex multichannel OH + CHNH reaction is investigated using high-level methods considering not just the abstraction, but the substitution pathways, too. The H-abstraction channels are proven to be exothermic with classical(adiabatic) relative energies of -25.58(-26.
View Article and Find Full Text PDFCross-sections for Sc, Sc, and Sc from two heavy ion reactions.
Appl Radiat Isot
January 2025
Department of Physics & Astronomy, University of Notre Dame, Notre Dame, 46556, IN, USA. Electronic address:
Two different heavy ion reactions were used to produce Sc (t = 3.891 h), Sc (t = 4.042 h), and Sc (t = 58.
View Article and Find Full Text PDFA Trade-off between Solvation and Collision Activation in Steering Competing E2 and S2 Dynamics.
Precis Chem
January 2024
State Key Laboratory of Urban Water Resource and Environment, MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China.
The prototypical E2 elimination and S2 substitution reactions between microsolvated fluoride and ethyl bromide show unexpected dynamic behaviors in mechanistic evolution driven by solvation and collision activation. Considering the steric effects, the gas-phase selectivity favors an E2 pathway barely dependent on collision energies. Remarkably, base solvation steers the reaction in an effective way toward substitution at a near-thermal energy, whereas the governing high-energy events retain elimination.
View Article and Find Full Text PDFInhomogeneity detection within a head-sized phantom using tracking of charged nuclear fragments in ion beam therapy.
Phys Med Biol
November 2024
Heidelberg Institute for Radiation Oncology (HIRO), National Center for Research in Radiation Oncology (NCRO), Heidelberg 69120, Germany.
The highly conformal carbon-ion radiotherapy is associated with an increased sensitivity of the dose distributions to internal changes in the patient during the treatment course. Hence, monitoring methodologies capable of detecting such changes are of vital importance. We established experimental setup conditions to address the sensitivity of a monitoring approach based on secondary-fragment tracking for detecting clinically motivated air cavity dimensions in a homogeneous head-sized PMMA phantom in 40 mm depth.
View Article and Find Full Text PDFWhole Abdominal Pencil Beam Scanned Proton FLASH Increases Acute Lethality.
Int J Radiat Oncol Biol Phys
September 2024
Departments of Radiation Oncology, Albert Einstein College of Medicine, Bronx, New York; Departments of Radiation Oncology and Pathology, Albert Einstein College of Medicine, Bronx, New York. Electronic address:
Article Synopsis
- - The study investigates the effects of ultrahigh dose-rate FLASH proton therapy on gastrointestinal injury, highlighting that while FLASH therapy aims to reduce normal tissue toxicity, it showed significantly reduced survival rates in mice compared to conventional therapy.
- - Whole abdominal irradiation was conducted on mice, using both FLASH and conventional proton therapy, and survival rates were assessed, along with intestinal histology analysis through a new AI-based technique.
- - Results indicated that despite enhanced dose rates with FLASH therapy, there was no significant improvement in gut cell regeneration or histology at 4 days post-irradiation, raising questions about FLASH's efficacy for gastrointestinal sparing.
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