Quantum differences of ortho/para H2O spin-isomers are considered as a key factor that determines water property taking into account the ortho/para conversion and the unbalanced. (1:1) ortho/para ratio in water. The biophysical mechanism of jump in the permeability of erythrocytes at the level of microcapillary at 36.6 degrees C in water-based physiological solution and at 37.4 degrees C in heavy water is proposed and discussed.
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Enhancing photon-counting computed tomography reconstruction via subspace dictionary learning and spatial sparsity regularization.
Quant Imaging Med Surg
January 2025
Henan Key Laboratory of Imaging and Intelligent Processing, Information Engineering University, Zhengzhou, China.
Background: Photon-counting computed tomography (CT) is an advanced imaging technique that enables multi-energy imaging from a single scan. However, the limited photon count assigned to narrow energy bins leads to increased quantum noise in the reconstructed spectral images. To address this issue, leveraging the prior information in the spectral images is essential.
View Article and Find Full Text PDFSynthesis and Chiroptical Activity of π-Expanded Electron-rich Heterohelicenes Based on the 1,4-Dihydropyrrolo[3,2-b]pyrrole core.
Chemistry
January 2025
Institute of Organic Chemistry PAS: Instytut Chemii Organicznej Polskiej Akademii Nauk, Institute of Organic Chemistry, Kasprzaka 44/52, 01-224, Warsaw, POLAND.
Herein, we report the synthesis and chiroptical characteristics of the first (double) helicenes possesing the 1,4-dihydropyrrolo[3,2-b]pyrrole (DHPP) moiety as their central core. We have developed a three-step synthesis with 6π-electrocyclization accompanied with HBr elimination as its key step. We found that, whereas for smaller periphereal arms double 6π-electrocyclization occurs smoothly forming a double helicene, in the case of longer policyclic aromatic hydrocarbons the reaction becomes less efficient and mono-helicenes are the only products.
View Article and Find Full Text PDFTailoring PbTe quantum dot Size and morphology via ligand composition.
Sci Rep
January 2025
Department of Physics, Ariel University, Ariel, 40700, Israel.
The literature shows a lack of significant research on the synthesis of large spherical PbTe quantum dots (QDs), particularly with controllable sizes and morphology. Here, we present for the first time a novel hot-injection method for the tunable, high-quality synthesis of cubooctahedral PbTe QDs within the size range of 10 nm to 16 nm. This method employs a combination of oleic acid (OA) with shorter carboxylic acids, including octanoic (OctA), decanoic (DA), and lauric acids (LA), tested at various volumetric ratios.
View Article and Find Full Text PDFComparative image quality and dosimetric performance of two generations of dedicated breast CT systems.
Med Phys
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Department of Medical Imaging, Radboud University Medical Center, Nijmegen, The Netherlands.
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Engineering Spin Interaction Channels of FePc on Au(111).
Nano Lett
January 2025
Center for Quantum Nanoscience, Institute for Basic Science, Seoul 03760, South Korea.
We demonstrate the reversible control of interactions between a local molecular spin, hosted within an iron phthalocyanine (FePc) molecule, and the conduction electrons of a supporting Au(111) surface. Using the tip of a scanning tunneling microscope, we deliberately and reversibly manipulate the adsorption configuration of the molecule relative to the underlying substrate lattice. Different rotation configurations lead to noticeable changes in the differential conductance measured on the FePc molecules.
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