Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"tissue density"”.
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Chromatophore tissue density and skeletal density banding as a measure of the adaptive response of healthy corals to environmental change
… layer of hermatypic scleractinian coral tissues, are postulated to enhance the photosynthetic activity of zooxanthellae symbionts and possibly protect the coral animal from harmful ultraviolet (UV) radiation. Yet connections have not previously been drawn between changes in the tissue …
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Quantitative tracking of the cellular and skeletal response of the Caribbean coral Orbicella annularis to gradients in marine sewage pollution
… of disease infection. Changes in O. annularis tissue cellular composition and skeletal structure have been tracked across a 75 km-long gradient from clean to polluted seawater on the fringing reef of the leeward coast of the island nation of Curaçao. A unidirectional ocean current flows to the …
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Development of A Beam-Specific Planning Target Volume and A Robust Plan Analysis to ol For Proton Therapy
… of a proton beam is heavily dependent on the tissue density along its beam path, uncertainties in patient setup position and inherent range calculation can degrade thedose distribution significantly. Despite these challenges that are unique to proton therapy, current management of the …
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Understanding low-penetrance genetic risk for breast cancer
… other established risk factors such as breast tissue density or family history risk as determined by the BOADICEA risk estimation tool. However, there were stronger associations of polygenic risk in both ER-positive disease and for those diagnosed at a younger age. Further research involving a …
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Hyperpolarized Xenon-129 Magnetic Resonance Imaging of Functional Lung Microstructure
… of oxygen in the lung by dissolving into lung tissue structures and entering the blood stream. HXe MRI therefore provides unique opportunities for functional lung imaging of gas exchange which occurs from alveolar air spaces across the air-blood boundary into parenchymal tissue. However …
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Functional divergence between Vachellia and Senegalia could underpin differences in invasiveness and Eltonian niche partitioning in African savannas
… competition and Senegalia has a conserved root tissue density response to grass competition. I argue that the rapid growth (bolting) strategy of Vachellia in the absence of grass competition provides a functional explanation for why this genus is observed to be relatively more invasive in grassy …
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Maintaining islet quality during culture
… impose oxygen limitations even at relatively low tissue surface densities. High density islet culture is desirable because it reduces space and handling requirements during culture, but it exacerbates oxygen (02) limitations, causing a reduction in islet viability. The overall objective of this …
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Mechanical Signals for Compensatory Lung Growth Assessed by High Resolution Computed Tomography
… in dogs i.e. to quantify lobar lung volumes and density gradients in normal and post-pneumonectomy (following lung resection) lungs. HRCT was used to quantitatively assess regional distribution of lung volume and density gradients among lobes of the lung in order to follow the expansion of …
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Degradation of proton and carbon Bragg peaks due to density inhomogeneities
… falloff (Bragg peak, BP) caused by inhomogeneous tissue. There is no appropriate model of this effect - which in turn allowed reduction of related dose deposition uncertainties. This thesis develops a comprehensive analytical model of the degradation resulting from static lung parenchyma. To do …
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Non-invasive quality evaluation of fruits and vegetables using ultrasound
… coefficient, modulus of elasticity, and tissue density were determined for each potato along two different orientations — longitudinal and transverse. Three varieties of apples, ‘Golden Delicious’, ‘Red Delicious’, and ‘Granny Smith’, were tested to detect their physiological changes with …
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Studies of Lung Micromechanics via Hyperpolarized 3He Diffusion NMR
… conventional proton MRI due to the organ's low tissue density, the advent of techniques in noble gas polarization have enabled MR investigations of the lung's more abundant air space rather than its tissue. In addition to high-resolution images of lung ventilation, lung morphometry via gas …
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The Use of Texture Analysis in Breast Magnetic Resonance Imaging
… resonance imaging (MRI) provides excellent soft tissue contrast and is unaffected by fibroglandular tissue density. By dynamically imaging during the injection of a contrast agent, a sensitivity approaching 100% is realised and lesion vascularity is portrayed. This makes the examination not only …
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Investigating the use of Raman spectroscopy as a histopathological tool to identify metastatic brain tumours and their sites of origin
… on sample preparation and resultant spectra. The tissue specimens used in this study were formalin fixed-paraffin preserved and were supported on spectroscopic substrates for analysis. Samples were dewaxed prior to analysis to reduce/eliminate the paraffin contributions in the Raman spectra. The …
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Analyzing the Effect of Neoadjuvant Stereotactic Ablative Body Radiotherapy on Pancreatic Tumour Perfusion Using Computed Tomography Perfusion
… PDAC characteristically has a high tumour density, which can significantly limit tumour perfusion and restrict the systemic delivery of chemotherapy drugs to the tumour site. To overcome this barrier, several studies have demonstrated that irradiating the tumour volume with a high dose of …
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The structure and mechanical behavior of bamboo and bamboo products
… products in large part depends on that of bamboo tissue. In this thesis, the structure and mechanical properties of dry bamboo tissue are related. Cellular level models are developed and explored, with a focus on density. Density is a practical parameter: it corresponds to weight, and places …
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Evaluation of bone strength: microtomographic tecniques
… The main objects of this study were the bone tissue properties and its resistance to mechanical loads. Moreover, the knowledge about the equipment selected to carry out the analyses, the micro-computed tomography (micro-CT), was improved. Particular attention was given to the reliability over …
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INTEGRATED MOLECULAR INVESTIGATIONS OF MYRF AND SFRP2: UNVEILING REGULATORY MECHANISMS OF ER STRESS AND ECM REMODELLING IN PANCREATIC CANCER
… of ECM components contributes to different tissue density and rigidity, leading cells to mount a mechanoresponsive transcription program. This work could provide i) a mechanistic understanding of MYRF in the regulation of ER activity. Considering the impact of ER stress on cancer cell …
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Effects of psyllium in milk replacers for neonatal dairy calves
… tract, size and scale of gastrointestinal tissues, ion transport measures, and histomorphological development in the gastrointestinal tract in neonatal dairy calves. Male Holstein calves, less than 36 h of age, were purchased for this trial. Calves were blocked by pairs and randomly …
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The effect of mechanical loading on bone during growth
… role in renewing the bone by replacing damaged tissue. Bone modeling primarily occurs during skeletal development in contrast with bone remodeling which occurs throughout life. Interestingly, the principal signal for both processes is believed to be local strain of the tissue. For almost two …
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Validation of numerical prediction of bone ingrowth into cementless implants
… implants is that the type and extent of tissue ingrowth into the porous coating is unpredictable. Movement of the implant relative to the surrounding bone may result in the formation of an interfacial fibrous tissue layer. Hence, numerical modelling has been used to predict tissue …
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