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Prediction of Cyclic O Molecules Stabilized by Helium under Pressure.
Adv Sci (Weinh)
January 2025
Center for High-Pressure Science, State Key Laboratory of Metastable Materials Science and Technology, School of Science, Yanshan University, Qinhuangdao, 066004, China.
Oxygen usually exists in the form of diatomic molecules at ambient conditions. At high pressure, it undergoes a series of phase transitions from diatomic O to O cluster and ultimately dissociates into a polymeric O spiral chain structure. Intriguingly, the commonly found cyclic hexameric molecules in other group VIA elements (e.
View Article and Find Full Text PDFEntropy stabilized form chirality in curved rod nematics: structure and symmetries.
Soft Matter
January 2025
Department of Materials Science, University of Patras, 26504 Patras, Greece.
Monte Carlo molecular simulations of curve-shaped rods show the propensity of such shapes to polymorphism revealing both smectic and polar nematic phases. The nematic exhibits a nanoscale modulated local structure characterized by a unique, polar, -symmetry axis that tightly spirals generating a mirror-symmetry-breaking organization of the achiral rods-form chirality. A comprehensive characterization of the polarity and its symmetries in the nematic phase confirms that the nanoscale modulation is distinct from the elastic deformations of a uniaxial nematic director in the twist-bend nematic phase.
View Article and Find Full Text PDFSimultaneous multislice diffusion imaging using navigator-free multishot spiral acquisitions.
Magn Reson Med
January 2025
Center for Biomedical Imaging Research, School of Biomedical Engineering, Tsinghua University, Beijing, China.
Purpose: This work aims to raise a novel design for navigator-free multiband (MB) multishot uniform-density spiral (UDS) acquisition and reconstruction, and to demonstrate its utility for high-efficiency, high-resolution diffusion imaging.
Theory And Methods: Our design focuses on the acquisition and reconstruction of navigator-free MB multishot UDS diffusion imaging. For acquisition, radiofrequency-pulse encoding was used to achieve controlled aliasing in parallel imaging in MB imaging.
Shear-Mediated Stabilization of Spin Spiral Order in Multiferroic NiI.
Adv Mater
January 2025
Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
Type-II multiferroicity from non-collinear spin order is recently explored in the van der Waals material NiI. Despite the importance for improper ferroelectricity, the microscopic mechanism of the helimagnetic order remains poorly understood. Here, the magneto-structural phases of NiI are investigated using resonant magnetic X-ray scattering (RXS) and X-ray diffraction.
View Article and Find Full Text PDFExpression of NKp46 and other activating inhibitory receptors on uterine endometrial NK cells in females with various reproductive failures: A review.
Reprod Med Biol
January 2025
Department of Obstetrics and Gynecology School of Medicine, Hyogo Medical University Nishinomiya Hyogo Japan.
Background: Uterine endometrial natural killer (uNK) cells represent major leukocytes in the mid-secretory phase of the cell cycle, and their number is further increased during early pregnancy. The activating and inhibitory receptors expressed on their surface mediate various functions of uNK cells, such as cytotoxicity, cytokine production, spiral artery remodeling, and self-recognition.
Methods: This study reviewed the most recent information (PubMed database, 175 articles included) regarding the activating and inhibitory receptors on uNK cells in human females with healthy pregnancies and the evidence indicating their significance in various reproductive failures.
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