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Achievement splitting for topological states with pseudospin in phase modulation by using gyromagnetic photonic crystals.
Sci Rep
July 2024
Key Laboratory of Opto-Electronics Information Technology (Tianjin University), Ministry of Education, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, China.
As we know, valley-Hall kink states or pseudospin helical edge states are excited by polarized-momentum-locking [left-handed circular polarization (LCP) and right-handed circular polarization (RCP)] because the valley-Hall kink modes or pseudospin polarized modes have intrinsic and local chirality, which is difficult for these states to achieve phase modulation. Here we theoretically design and study a compatible topological photonic system with coexistence of photonic quantum Hall phase and pseudospin Hall phase, which is composed of gyromagnetic photonic crystals with a deformed honeycomb lattice containing six cylinders. A typical kind of hybrid topological waveguide states with pseudospin-characteristic, magnetic field-dependent, and strong robustness against backscattering and perfect electric conductor (PEC) is realized in the present system.
View Article and Find Full Text PDFThe lack of EphB3 receptor prevents bone loss in mouse models of osteoporosis.
J Bone Miner Res
August 2024
Department of Cell Biology, Faculty of Biological Sciences, Complutense University of Madrid, C.P. 28040, Madrid, Spain.
Article Synopsis
- Bone homeostasis involves EphB2 and EphB3 receptors in mesenchymal stromal/stem cell differentiation into bone tissue.
- In vitro studies show that EphB3-/- MSCs express more osteogenic factors while EphB2-/- MSCs lean towards fat cell differentiation.
- In vivo experiments with mouse models indicate that EphB3 deficiency protects against bone loss by maintaining higher levels of osteoprogenitor and preosteoblast cells, highlighting its role as a negative regulator of bone differentiation.
The catalytic reaction of cytochrome c oxidase probed by in situ gas titrations and FTIR difference spectroscopy.
Biochim Biophys Acta Bioenerg
November 2023
Freie Universität Berlin, Experimental Molecular Biophysics, Arnimallee 14, D-14195 Berlin, Germany; Technische Universität Berlin, Division of Physical Chemistry, Strasse des 17. Juni 115, D-10623 Berlin, Germany. Electronic address:
Cytochrome c oxidase (CcO) is a transmembrane heme‑copper metalloenzyme that catalyzes the reduction of O to HO at the reducing end of the respiratory electron transport chain. To understand this reaction, we followed the conversion of CcO from Rhodobacter sphaeroides between several active-ready and carbon monoxide-inhibited states via attenuated total reflection Fourier-transform infrared (ATR FTIR) difference spectroscopy. Utilizing a novel gas titration setup, we prepared the mixed-valence, CO-inhibited RCO state as well as the fully-reduced R and RCO states and induced the "active ready" oxidized state O.
View Article and Find Full Text PDFA low-cost smartphone fluorescence microscope for research, life science education, and STEM outreach.
Sci Rep
March 2023
Biology Department, Winona State University, Winona, MN, USA.
Much of our understanding of cell and tissue development, structure, and function stems from fluorescence microscopy. The acquisition of colorful and glowing images engages and excites users ranging from seasoned microscopists to STEM students. Fluorescence microscopes range in cost from several thousand to several hundred thousand US dollars.
View Article and Find Full Text PDFInvolvement of Ca in Signaling Mechanisms Mediating Muscarinic Inhibition of M Currents in Sympathetic Neurons.
Cell Mol Neurobiol
July 2023
Department of Physiology, Seoul National University College of Medicine, Seoul, Korea.
Acetylcholine can excite neurons by suppressing M-type (KCNQ) potassium channels. This effect is mediated by M muscarinic receptors coupled to the G protein. Although PIP depletion and PKC activation have been strongly suggested to contribute to muscarinic inhibition of M currents (I), direct evidence is lacking.
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