Objective Microdamage accumulation (including linear microcracks and diffuse microdamage) contributes to impaired skeletal mechanical integrity. Bone can remove microdamage by initiating targeted bone remodeling. Howe...
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Objective Microdamage accumulation (including linear microcracks and diffuse microdamage) contributes to impaired skeletal mechanical integrity. Bone can remove microdamage by initiating targeted bone remodeling. However, the spatiotemporal characteristics of microdamage initiation and propagation and its relationship with bone remodeling in response to fatigue loading, especially for more physiologically-relevant daily bout of
Objective Since the 1960s, astronauts have started missions in space and consistently shown an increased risk of infection and an overall decrease in immune function due to microgravity condition. The mechanisms under...
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Objective Since the 1960s, astronauts have started missions in space and consistently shown an increased risk of infection and an overall decrease in immune function due to microgravity condition. The mechanisms underlying these abnormalities are still unclear. To mitigate immune dysfunction in crews on future missions to outer space, it is critical to understand the mechanism of how microgravity influences immune system. Since the1960s, astronauts have started missions in space and consistently shown an increased risk of infection and an
Objective Mechanical stimulation plays an important role during the process of skeletal system development and growth. As a new focus of mechanobiology, non-coding RNA takes an important part in regulating gene expres...
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Objective Mechanical stimulation plays an important role during the process of skeletal system development and growth. As a new focus of mechanobiology, non-coding RNA takes an important part in regulating gene expression and biological functions under mechanical stimulation. However, its mechanism is still not clear. Methods For the purpose of discovering mechano-sensitive IncRNAs involved in osteogensis, we initiated characterization of IncRNAs by screening the expression levels of IncRNAs in random positioning machine treated me-
Objective Mechanical stimuli play crucial roles in bone remodeling and resorption. Among mechanical stimuli, altered gravity involving microgravity and hypergravity has attracted interest for studying the effects of s...
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Objective Mechanical stimuli play crucial roles in bone remodeling and resorption. Among mechanical stimuli, altered gravity involving microgravity and hypergravity has attracted interest for studying the effects of space flight. These recent findings suggest that hypergravity triggers complex mechanotransduction pathways regulated at both transcriptional and post-transcriptional levels. However, the potential role of long noncoding RNA(IncRNA) on osteoblasts in hypergravity environment still remains largely unclear. The aim of this study is to in-
Objective It is well known that the benefits from performing carotid endarterectomy for the patients with stenosis severity between 50%and 70%, remains questionable. With a 2%-4%event rate, most of the surgeries were ...
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Objective It is well known that the benefits from performing carotid endarterectomy for the patients with stenosis severity between 50%and 70%, remains questionable. With a 2%-4%event rate, most of the surgeries were unnecessary. Investigation of plaque development for these patients may aid in making more plausible decision on clinical intervention. We hypothesize that combining morphological and mechanical risk factors may improve plaque progression prediction. In this paper, plaque burden (PB),cap thickness (CT),lipid percent
Objective Medical imaging resolution has been a limitation for image-based coronary plaque models to obtain accurate morphological and stress/strain data for plaque progression investigation. The resolution for intra-...
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Objective Medical imaging resolution has been a limitation for image-based coronary plaque models to obtain accurate morphological and stress/strain data for plaque progression investigation. The resolution for intra-vascular ultrasound (IVUS) images is around 100-150 micron which is not enough to identify vulnerable plaques with thin cap thickness <65 micron. Optical coherence tomography (OCT) has 15-20 um resolution and has become a powerful tool to detect vulnerable plaques with thin fibrous cap. But OCT has limited penetration and
Objective Plaque progression and vulnerability are influenced by many risk factors. Our goal is to find a simple way to combine multiple risk factors and achieve better plaque development predictions. Methods A sample...
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Objective Plaque progression and vulnerability are influenced by many risk factors. Our goal is to find a simple way to combine multiple risk factors and achieve better plaque development predictions. Methods A sample size of 254 intravascular ultrasound (IVUS) slices with noticeable change of plaque burden was obtained from 9 patients who underwent baseline and follow-up IVUS, and FSI modeling for plaque mechanical condi-
Objective Patient-specific in vivo ventricle material parameter value determination is important for cardiovascular investigations. Ventricle active contraction caused by sarcomere shortening leads to change of ventri...
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Objective Patient-specific in vivo ventricle material parameter value determination is important for cardiovascular investigations. Ventricle active contraction caused by sarcomere shortening leads to change of ventricular zero-load configurations. A new modeling approach with different zero-load diastole and systole geometries was used to estimate right ventricle material parameter values for healthy and repaired Tetralogy of Fallot (TOF) patients for potential clinical applications. Methods Cardiac magnetic resonance (CMR) data were obtained from 6
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