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 69 for “"oxygen transport"”.
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Carrier-facilitated oxygen transport in flowing blood
An experimental investigation was done on oxygen transfer into a steady, laminar flow of whole blood and hemoglobin solutions. The effects of facilitation and augmentation on the bulk transfer were studied. The transfer problem was modeled numerically and effective diffusivities were calculated for …
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Microvascular oxygen transport: development of an optical triplicator
Microvascular oxygen transport has been studied using many experimental methods. The three wavelength photometric method of Pittman and Duling (6) was the basis for this project. An optical triplicator was introduced into the microscopy assembly. The triplicator’s function was to take the image …
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Modelling Blood Flow & Oxygen Transport in the Active Brain
… brain is critically dependent on the supply of oxygen and glucose from the bloodstream. When a brain region is activated, blood flow to that area increases; this phenomenon is termed functional hyperemia, but it remains incompletely understood. In this thesis, a novel mathematical model of blood …
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Oxygen transport in animal cell biogreactors with vibrating-plate aerators
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1995.
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Statistical study of oxygen+ transport from the cusp to the plasmasheet
… that the probability to observe O+ along the transport path is high even during nonstorm times, although, as expected, the highest probability is found during storm times. In addition to the outflow rate increasing, the transport path itself also changes during storm times, bringing more O+ to …
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A study on the resistances to oxygen transport in the microcirculation
A study on the resistances to oxygen transport in the microcirculation has been conducted. In Part I of this work, the oxygen permeability of cultured bovine aortic and human umbilical vein endothelial cell monolayers was measured directly in vitro. The monolayers were cultured on silicone rubber …
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Combined Hydrogen and Oxygen transport membranes in the activation of Methane
Dense ceramic membranes have been extensively studied for gas separation and as reaction supports for significant environmental processes. In the work presented in this thesis, yttrium/zirconia doped barium cerate (BaCe0.8Y0.2O3-δ- BCY20 and BaCe0.6Zr0.2Y0.2O3-δ- BCZY) powders were synthesised …
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Oxygen Transport in the Human Placenta: A Multi-Physics Modelling Approach
… analysis (FEA), were combined to study the oxygen transport mechanism in the human placenta and its relationship to placental structure. Initial research relates to the development of a platform suitable for realistic computational simulations. The work shows how the 3D architecture of a …
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Oxygen Transport Membrane Reactors for Oxy-Fuel Combustion and Carbon Capture Purposes
<p>This thesis investigates oxygen transport membrane reactors (OTMs) for the application of oxy-fuel combustion. This is done by evaluating the material properties and oxygen permeability of different OTM compositions subjected to a variety of operating conditions. The scope of this work consists …
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Oxygen Transport in Vapor-Deposited Tin-Doped Indium Oxide Films (Diffusion, Electrochemical)
… yttria-stabilized zirconia solid electrolytes. Oxygen transport through the films was monitored between 1100 and 1300(DEGREES)K near atmospheric oxygen pressures using electrochemical techniques. An attempt was made to correlate the transport data to a diffusion model based on the defect …
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Mechanistic modeling of increased oxygen transport using functionalized magnetic fluids in bioreactors
… in aerobic cultures are often constrained by transport of oxygen, which is only slightly soluble in water. Previous approaches to enhance oxygen transfer consisted in adding emulsified organic phases in which oxygen has a greater solubility. However, these approaches have several limitations, …
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Influx and Efflux of Adenine Nucleotides From Erythrocytes Regulate Oxygen Transport and Systemic Metabolism
… responsible for ensuring a sufficient supply of oxygen to meet activity demands. The mammalian erythrocytes primarily modulate their oxygen-carrying capacity by varying the levels of organic phosphates, such as 2,3-BPG. In other organisms, such as fish, ATP instead of 2,3-BPG is used to modulate …
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Redox regulation of vascular NO bioavailability during hypoxia: implications for oxygen transport and exercise performance
… of fatigue. Changes in cerebral and muscle oxygenation have not been well characterised during incremental exercise in hypoxia. It is possible attainment of O2peak is driven by the oxygenation profile of these tissues whilst changes in molecular biomarkers of endothelial function could …
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Model analysis of oxygen transport and metabolism in skeletal muscle: responses to a change in energy demand
<p>The increase in skeletal muscle oxygen consumption (VO<sub>2</sub>) at the onset of contraction is an indicator of the ability to do work. The VO<sub>2</sub> response to contraction (i.e., VO<sub>2</sub> kinetics) is determined by oxygen delivery (convective and diffusive) to tissue, oxygen …
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Oxygen Transport, Shear Stress, And Metabolism In Perfused Hepatocyte-Seeded Scaffolds With Radial Pore Architecture: Experimental And Computational Analyses
… cell numbers, be cultured at physiological oxygen tensions and, can be fully integrated into and heal the injured hepatic space. In this study we investigated the effects that convective and direct oxygenation had on hepatocyte functionality, morphology and viability while cultured in bulk …
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On the reduction of oxygen from dispersed media
The reduction of oxygen from an organic phase dispersed in a concentrated electrolyte is investigated. Dispersed organic phases are used to enhance oxygen transport in fermenters and artificial blood substitutes. This work evaluates the feasibility of using a dispersed organic phase to transport …
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Moessbauer Studies of Exchange-Coupled Two-Iron Centers in Proteins (Hemerythrin, Uteroferrin, Epr)
… measurements on three derivatives of the oxygen-transport protein hemerythrin and on the oxidized and reduced forms of uteroferrin, a purple acid phosphatase isolated from porcine uterine fluid. Both proteins contain an exchange-coupled pair of iron atoms coordinated directly to amino acid …
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