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 148 for “"degradation rate"”.
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DEVELOPMENT OF SYNTHETIC POLYMERS FOR BONE TISSUE ENGINEERING: ENGINEERING THE DEGRADATION RATE
… synthetic polymers, poly (butylene fumarate) (PBF) and the copolymer poly (butylene fumarate)-co-(butylene maleate) (PBFcBM) is described. The unsaturated linear polyesters were synthesized via two synthetic routes, including an acid catalyzed transesterification reaction of …
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Extrusion and evaluation of degradation rate and porosity of small diameter collagen tubes
… extruded using bovine collagen type I. The biodegradation rate was determined and compared for small diameter collagen tubes crosslinked with glutaraldehyde and N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride (EDC) and Nhydroxysuccinimide (NHS) to evaluate physio-chemical …
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Effects of degradation rate and crosslink density of artificial skin on wound contraction
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1986
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Degradation of polylactic acid in the presence of microsize and nanosize fillers
… and their composites are subjected to isothermal degradation in air at 180 C and 200 C. Degradation rate constants are calculated from novel equations incorporating IV. Results show that the thermal degradation rate constants of the amorphous PLA and its composites are lower than those of the …
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The effects of pH on the biodegradation of benzene, toluene, ethylbenzene, m-Xylene in soils
… used to examine the effect of soil pH on the biodegradation of benzene, toluene, ethylbenzene, and m-xylene in subsurface soils. The biodegradation potential of both denitrifying and aerobic respiring microorganisms were assessed. Uncontaminated soil from five different soil depths was utilized. …
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Degradation of Aspartate Transcarbamylase in Growing and Starved Bacillus Subtilis Cells
… subtilis cells for carbon or nitrogen. The rate of ATCase degradation in exponentially growing B. subtilis cells was determined by measurement of enzyme activity after the addition of uridine to repress further enzyme synthesis and by specific immunoprecipitation of the enzyme from cells …
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Influence of alloying and processing on the degradation properties of Mg-Dy-Zn alloys under physiological conditions
Alloying and processing are critical strategies for enhancing the mechanical properties of Mg-based biomaterials. However, the intermetallics can precipitate during these procedures and subsequently introduce the galvanic corrosion, which may accelerate the degradation of Mg alloys. To investigate …
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Engineering Dynamic Granular Composites for the Repair of Cartilage Tissue
… are being used as ‘building blocks’ to generate engineered tissues. MSC spheroids can fuse together to produce high cell density, macroscopic tissues with enhanced functional properties; however, their potential is hindered by challenges in the stabilization of and control over fusion. …
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Characterisation of radiation effects in ultra-thin GaAs solar cells for space applications
… and current-voltage measurements. It is demonstrated that the preservation of short-circuit current up to high dose in ultra-thin solar cells can be attributed to the carrier lifetime remaining greater than the time taken for carriers to traverse the absorber layer, even after the lifetime is …
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ΜΕΛΕΤΗ ΤΗΣ ΒΑΡΕΙΑΣ ΜΥΑΣΘΕΝΕΙΑΣ ΚΑΙ ΤΟΥ ΥΠΟΔΟΧΕΑ ΤΗΣ ΑΚΕΤΥΛΟΧΟΛΙΝΗΣ ΜΕ ΤΗΝ ΒΟΗΘΕΙΑ ΜΟΝΟΚΛΩΝΙΚΩΝ ΑΝΤΙΣΩΜΑΤΩΝ
… IN INCREASED RECEPTOR INTERNALIZATION AND DEGRADATION RATE (ANTIGENIC MODULATION). (B) COMPLEMENT BINDS TO THE ANTIBODIES WHICH ARE ATTACHED ON THE MEMBRANE ACHRS CAUSING FOCAL LYSIS OF THE ACHR-BEARING MEMBRANES. ANTI-ACHR ANTIBODIES IN MG SERA ARE HETEROGENEOUS. IDENTIFICATION OF THE …
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Biokompatibilität einer Kollagen-Typ-I-Membran im subretinalen Raum
… after a maximum of 16 weeks, the integration and degradation of a collagen membrane in the subretinal space. The membrane could be successfully cultured with retinal pigment epithelium and where the inner collagen layer of Bruch's membrane, which consists mainly of type I collagen. The subretinal …
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Cytotoxic Activity of Non-Specific Lipid Transfer Protein (nsLTP1) and Proteomic Evaluation of Heparin-Binding Proteins from Ajwain (Trachyspermum ammi) Seeds
… undiscovered. The present study demonstrated the antiproliferative activity of ajwain nsLTP1 in MCF-7, AsPC-1, and MCF10A cell lines and its structural stability in human serum and high-temperature conditions. The antiproliferative activity of ajwain nsLTP1 was evaluated in MCF-7 and …
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Cell-mediated contraction & induced regeneration of the injured peripheral nerve
… chemical composition and pore size, and varying degradation rate was used to evaluate the ability of a porous scaffold to block MFB contraction after injury in a demanding model of peripheral nerve regeneration in the adult rat. At 9 weeks post-neurotmesis, the MFB capsule thickness, 5, around …
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Degradation of GaN High Electron Mobility Transistors under high-power and high-temperature stress
… wide deployment can be realized. In this thesis, degradation mechanisms of GaN HEMTs under high-power and high-temperature stress have been studied. A novel technique to extract activation energy of degradation rate from measurements on a single device has been proposed. High-power and …
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Spatiotemporal Performance Analysis to Identify Degradation Trends in a Utility-Scale PV Plant
… project aims to investigate the performance and degradation trends of a 75 MWp PV plant as well as the environmental factors that affect this plant, using measured meteorological and operational data, over the course of nine years. The data is first processed, reducing its size by 79.8% to an …
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The Development of M3+-Doped Mesoporous Ti4O7 Electrode for Pharmaceutical Degradation in Fresh Human Urine
An ideal electrode material for pharmaceutical degradation should be efficient, low-cost, and stable. However, none of the well-studied anode material has a lifetime of more than 400 hours. In this work, we fabricate metal with valence number three (M3+) doped-mesoporous Ti4O7 planner electrodes. …
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Die Bedeutung der Rhizosphäre von Bromus mollis L. als Ort erhöhter mikrobieller Aktivität im Boden für eine mögliche Mineralisation von Xenobiotika
… study the connection between root growth and degradation of xenobiotics in the rhizosphere of Bromus mollis L. (Poacea) has been investigated with an especially assembled experiment. The regular root system (secondary homorhizie) of the test plant as well as the sufficient production rate of …
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Controlling the alignment and degradation of 3D printed poly-L-lactic acid for redesigned coronary stents
… PLA stents have suffered from uncontrolled degradation and increased risk of late-stage thrombosis. Internal differences in microstructure, arising from the manufacturing and implantation process, resulted in an asymmetric degradation profile. If, however, the effect of microstructure on …
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Effects of Lignite Fly Ash on the Degradative Pathways of Aqueous Amine Solvents
… was investigated. It was found increase the degradation rate significantly, and products unique to this study were identified. The fly ash was characterized post-trial by spectroscopic and physical methods. A large increase in the adsorption capacity of pyridine in the post-reactor sample was …
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