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An investigation of the mechanism of adjacent segment disease in a porcine spine model.
Clin Biomech (Bristol)
January 2025
Department of Kinesiology and Physical Education, Wilfrid Laurier University, Waterloo, Ontario, Canada; Department of Health Sciences, Wilfrid Laurier University, Waterloo, Ontario, Canada. Electronic address:
Background: Fusion changes the biomechanics of the spine leading to the potential development of adjacent segment disease. Despite many studies on adjacent segment disease, it is largely unknown how spinal fixation affects the mechanical properties of the adjacent disc. The purpose of this study was to assess whether axial compression causes mechanical disruption to the annulus when the caudal spinal level is immobilized or injured.
View Article and Find Full Text PDFDiagnosis, Classifications and Treatment of Os Odontoideum: WFNS Spine Committee Recommendations.
Spine (Phila Pa 1976)
January 2025
Department of Neurosurgery, Lilavati Hospital and Research Center, Bandra, Mumbai, India.
Study Design: A systematic literature review and consensus using Delphi method.
Objective: The aim was to formulate consensus recommendations regarding the natural history, diagnosis, classification and optimal treatment of Os Odontoideum with global applicability.
Summary Of Background: Os odontoideum (OO) is a rare anomaly of the cranio-vertebral junction (CVJ).
Iron-histidine Coordination in Cytochrome b5: A Local Vibrational Mode Study.
Chemphyschem
January 2025
Southern Methodist University, Chemistry, 3251 Daniel Ave, 75275, Dallas, UNITED STATES.
We analyzed the intrinsic strength of distal and proximal FeN bonds and the stiffness of the axial NFeN bond angle in a series of cytochrome b5 proteins isolated from various species, including bacteria, animals, and humans. Ferric and ferrous oxidation states were considered. As assess- ment tool, we employed local vibrational stretching force constants ka(FeN) and bending force constants ka(NFeN) derived from our local mode theory.
View Article and Find Full Text PDFStudy on the Axial Compressive Behavior and Constitutive Relationship of Lightweight Mixed Ceramic Concrete.
Materials (Basel)
January 2025
Henan Yuanda Sustainable Building Technology Co., Ltd., Anyang 455000, China.
To thoroughly study the stress-strain relationship of lightweight mixed ceramic concrete, this paper conducts axial compressive strength tests on three groups of lightweight mixed ceramic concrete specimens with different types and contents as the basis. It establishes the elastic modulus calculation formula and compressive stress-strain formula for lightweight mixed ceramic concrete by combining with the current standards and related research. The results show that lightweight mixed ceramic concrete, made of a mixture of different types and densities of ceramic grains, has better mechanical properties and deformation properties.
View Article and Find Full Text PDFTheoretical Research on the Axial Compression Capacity of Reinforced Concrete Mid-Long Columns Reinforced with Ultra-High-Performance Concrete.
Materials (Basel)
January 2025
School of Civil and Architectural Engineering, Hunan Institute of Science and Technology, Yueyang 414000, China.
Ultra-high-performance concrete (UHPC) is a cement-based composite material characterised by exceptional strength, low porosity and high durability, making it highly promising for reinforcement engineering. Based on the theory of tangential modulus, a calculation method has been developed for the axial compression capacity of reinforced concrete (RC) medium and long columns strengthened with UHPC, using the constitutive relation of materials and internal and external force balance conditions. This study analysed the influence of UHPC reinforcement layer thickness, reinforced layer, reinforcement ratio, column slenderness ratio and initial load level of core columns on the bearing capacity of reinforced columns.
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