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  • Anisometry Anterior Cruciate Ligament Sport Injury Mechanism Study: A Finite Element Model with Optimization Method
  • Abstract ACL damage is one the most frequent causes of knee injuries and thus has long been the focus of research in biomechanics and sports medicine. Due to the anisometric geometry and functional complexity of the ACL in the knee joint, it is usually difficult to experimentally study the biomechanics of ACLs. Anatomically ACL geometry was obtained from both MR images and anatomical observations. The optimal material parameters of the ACL were obtained by using an optimization-based material identification method that minimized the differences between experimental results from ACL specimens and FE simulations. The optimal FE model simulated biomechanical responses of…
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  • Investigation on Energy Characteristic of RBCs Deformability: A Quantitative Analysis of Extending and Retracting Curves Based on AFM
  • Abstract Deformability is a fundamental property of the cells and tissues of living organisms, which is commonly detected to indicate the state of the cells. And the cell deformability usually depends on the methods that we used, which is easy to be confused. The present research is designed to explore the energy characteristic of red blood cell deformability, based on a quantitative analysis of extending-retracting curves acquired from atomic force microscopy. ATP-depleted red blood cells are prepared by treatment with free-glucose Ringer solution. Our results clearly show that the Youngs’ modulus of erythrocyte is closely depended on the concentration of intracellular…
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  • Rationally Designed Synthetic Protein Hydrogels with Predictable and Controllable Mechanical Properties
  • Abstract A key challenge in biomaterials research is to produce synthetic hydrogels that can replicate the diverse mechanical properties of the naturally occurring tissues for various biomedical applications, including tissue engineering, stem cell and cancer research, cell therapy, and immunomodulation. However, currently, the methods that can be used to control the mechanical properties of hydrogels are very limited and are mainly focused only on the elasticity of hydrogels. In this work, combining single molecule force spectroscopy, protein engineering and theoretical modeling, we show that synthetic protein hydrogels with predictable mechanical properties can be rationally designed using protein building blocks with known…
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  • Microspheres Modified with the Heparin Increasing the Length of Molecular Linker to Better Capture the Endotoxin
  • Abstract Endotoxin is a a very powerful and toxic inflammatory stimulator usually leading to the sepsis occurred. In order to remove endotoxin better through hemoperfusion, it is a pretty choice to increase the length of molecular linker on adsorbents. In this study, we chose the heparin as a molecular linker because of its being anticoagulant linear polysaccharide. Heparin as a linker was covalently immobilized on the chloromethylated polystyrene microspheres (Ps) and then connected with L-phenylalanine (Phe) forming the Ps-Hep-Phe structure to adsorbed endotoxin better. The property of microspheres was characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, zeta potential and…
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  • The Mechanical Mechanism of Cortical Folding on 3D Cerebral Organoids
  • Abstract An expansion of the cerebral neocortex is thought to be the foundation for the unique intellectual abilities of humans. The cortical folding has been implicated in neurodevelopmental disorders and yet its origins remain unknown. In vitro culture of 3D cerebral organoids from human pluripotent stem cells has been used to study the fundamental mechanisms of mammalian neurodevelopment and characteristics of human brain development. Here, we explores the mechanism of boundary limitation on the formation of gyri and sulci through the self-organization of human brain organoids. The structure of cerebral organoids was analyzed by morphology observation, pathology and immunofluorescence. The different…
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  • The Rate of Fluid Shear Stress is a Potent Regulator for Lineage Commitment of Mesenchymal Stem Cells Through Modulating [Ca2+]i, F-actin and Lamin A
  • Abstract Mesenchymal Stem Cells (MSCs) are recruited to the musculoskeletal system following trauma [1] or chemicals stimulation [2]. The regulation of their differentiation into either bone or cartilage cells is a key question. The fluid shear stress (FSS) is of pivotal importance to the development, function and even the repair of all tissues in the musculoskeletal system [3]. We previously found that MSCs are sensitive enough to distinguish a slight change of FSS stimulation during their differentiation commitment to bone or cartilage cells, and the internal mechanisms. In detail, MSCs were exposed to laminar FSS linearly increased from 0 to 10…
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  •   Views:961       Downloads:153        Download PDF
  • A New Mass Effect Research Rat Model to Explore the Occuping Effect on Secondary Brain Injuries after ICH
  • Abstract The mechanical response of brain tissue closely relates to cerebral blood flow and brain diseases. During intracerebral haemorrhage (ICH), a mass effect occurs during the initial bleeding. As the hematoma increases, the haematoma mass effect continues to squeeze the brain tissue mechanically, which can even lead to the formation of fatal cerebral hernia. However, fewer studies have focused on the brain damage mechanisms and treatment approaches associated with mass effects compared to the secondary brain injuries after ICH, which may be a result of the absence of acceptable animal models mimicking a mass effect. Thus, a thermo-sensitive poly (N-isopropylacrylamide) (PNIPAM)…
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  • Oscillatory Shear Stress Induces Endothelial Dysfunction through the Activation of P2Y12
  • Abstract Endothelial cell injured or dysfunction, which results lipid deposition and inflammation, is the key point to exacerbate the process of atherosclerosis [1, 2]. Meanwhile oscillatory shear stress is a key factor that results cell dysfunction in vascular disease [3, 4]. Previous research reported that P2Y12 plays a critical role in the development of atherosclerotic lesion through promoting smooth muscle cells migration [5]. As well P2Y12 stimulated the internalization and transendothelial transport of high density lipid. However, whether the P2Y12 induce atherosclerosis through endothelial cell remain elusive. In this study we firstly found P2Y12 were expressed in endothelial cells of atheroprone…
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  • Endothelial Tight Junction Protein ZO-1 Response to Multiple-Mechanical Stimulations After Stent Implamtation
  • Abstract Zonula occludens-1 (ZO-1) is a peripheral membrane protein belongs to the family of zona occludens proteins and plays an important role as a scaffold protein which cross-links and anchors tight junction (TJ) strand proteins, within the lipid bilayer, to the actin cytoskeleton[1-2]. Stent implantation is the most effective method in the treatment of cardiovascular disease which always destroy junctions of endothelial cells, the functions of the tight junction were also affected. However, the role of ZO-1 before and after stent implantation has not been fully understood. In this study, the expression of ZO-1 were analyzed by qPCR, western blot and…
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  •   Views:2162       Downloads:159        Download PDF
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