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In solid-state nuclear magnetic resonance (ssNMR) spectroscopy, fast magic angle spinning (MAS) is a potent technique that efficiently reduces line broadening and makes it possible to probe structural details of biological systems in high resolution. However, its utilization in studying complex heterogeneous biomaterials such as bone in their native state has been limited. The present study has demonstrated the feasibility of acquiring two-dimensional (2D) H-H correlation spectra for native bone using multiple-quantum/single-quantum correlation experiments (MQ/SQ) at fast MAS (70 kHz).
View Article and Find Full Text PDFFast STEM image simulation in low-energy transmission electron microscopy by the accurate Chen-van-Dyck multislice method.
Micron
December 2024
Pico Electron Microscopy Center, Innovation Institute for Ocean Materials Characterization Technology, Center for Advanced Studies in Precision Instruments, Hainan University, Haikou, Hainan 570228, China; Key Laboratory of Pico Electron Microscopy of Hainan Province, Hainan University, Haikou, Hainan 570228, China. Electronic address:
The Chen-van-Dyck (CVD) formulation as a rigorous numerical solution to the Schrödinger equation has been demonstrated being the only accurate multislice method for calculating diffraction and imaging in low-energy transmission electron microscopy. The CVD formulation not only considers the forward scattering effects but also includes the backscattering effects. However, since its numerical computation has to be performed in real-space, the CVD method may suffer from divergence and inefficiency in computing time, especially when used for low-energy scanning transmission electron microscopy (STEM) image simulation.
View Article and Find Full Text PDFX-Ray Crystallography of Viruses.
Subcell Biochem
December 2024
ALBA Synchrotron Light Source, Cerdanyola del Vallès, Spain.
Since the 1970s and for about 40 years, X-ray crystallography has been by far the most powerful approach for determining virus structures at close to atomic resolutions. Information provided by these studies has deeply and extensively enriched and shaped our vision of the virus world. In turn, the ever-increasing complexity and size of the virus structures being investigated have constituted a major driving force for methodological and conceptual developments in X-ray macromolecular crystallography (MX).
View Article and Find Full Text PDFWALINET: A water and lipid identification convolutional neural network for nuisance signal removal in MR spectroscopic imaging.
Magn Reson Med
December 2024
Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, Massachusetts, USA.
Purpose: Proton magnetic resonance spectroscopic imaging ( -MRSI) provides noninvasive spectral-spatial mapping of metabolism. However, long-standing problems in whole-brain -MRSI are spectral overlap of metabolite peaks with large lipid signal from scalp, and overwhelming water signal that distorts spectra. Fast and effective methods are needed for high-resolution -MRSI to accurately remove lipid and water signals while preserving the metabolite signal.
View Article and Find Full Text PDFElectrochemical Synthesis of Zeolite Coatings with Controlled Crystal Polymorphism and Self-Regulating Growth.
JACS Au
December 2024
Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware DE 19716, United States.
Zeolite coatings are studied as molecular sieves for membrane separation, membrane reactors, and chemical sensor applications. They are also studied as anticorrosive films for metals and alloys, antimicrobial and hydrophobic films for heating, ventilation, and air conditioning, and dielectrics for semiconductor applications. Zeolite coatings are synthesized by hydrothermal, ionothermal, and dry-gel conversion approaches, which require high process temperatures and lengthy times (ranging from hours to days).
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