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Showing 1 to 20 of 62 for “"surface activity"”.
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Effects of Osmolytes on Amyloid-beta Protein Surface Activity and Membrane Interactions
… unknown. It has been shown previously that Aβ's surface activity and favorable interaction with lipid membranes can induce the formation of fibrils, suggesting a possible membrane-based mechanism of Aβ aggregation in Alzheimer's disease. Unlike dilute solutions used for in vitro experiments, the …
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Reconstruction of the Spatial Distribution of Surface Activity Concentration for an In-Situ, Gamma-Ray, Truck-Borne Survey
… surveys to reconstruct the distribution of surface activity concentration of the deposited material, lanthanum-140. One of these surveys involved using a truck-borne, directional spectrometer, which contained four, standing, NaI(Tl) detectors. The Electron Gamma Shower code of the National …
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Surface Activity at the Air-Water Interface and Self-Stratification of Silica Nanoparticles Functionalized with Tri-Methoxy Poly(ethylene glycol) Silane
… a methyl group. This functionalization imparts surface activity at the air-water interface due to the hydrophobic nature of the end-capped methyl group. To determine the surface coverage of silane on the particle surface, solution-state <sup>1</sup>H-NMR spectroscopy was utilized for …
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I. Studies on the Evaluation of Sedimentation and Diffusion Coefficients With Application to Heterogeneous Systems. Ii. The Surface Activity of Dextran Solutions
Made available in DSpace on 2014-12-05T19:36:46Z (GMT). No. of bitstreams: 1 0025266.pdf: 5699690 bytes, checksum: fbe280ac02c423a73032d9e0c99e310e (MD5) Previous issue date: 1957
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Application of the transformation of 1,2,4-Trimethylbenzene to monitor the chemical vapour deposition of Tetraethoxysilane over ZSM-5
… This results in a better control of the external surface activity and the pore mouth size of ZSM-5. In search for effective characterisation tools and a model reaction which involves molecules which are critical in size relative to the size of the ZSM-5 channels, the transformation of …
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Natural History and Conservation of Bolitoglossine Salamanders in Central Panama
… suggest that this could lead to a decrease in surface activity of some tropical plethodontid species. Conservationists need to be aware of the effects of drought on surface activity of these species and understand that it likely will make monitoring and detection of population changes more …
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The structure and function of TasA in the <i>Bacillus subtilis</i> biofilm matrix
… are communities of microorganisms attached to a surface and encompassed within a self-produced extracellular matrix. The matrix functions to shield the interior cells from biotic and abiotic stresses and to retain nutrients and signalling molecules. The multiple functions of the biofilm matrix …
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Habitat use and activity patterns of Gopher Tortoises (Gopherus polyphemus) inhabiting military test ranges and forested sandhills at Eglin Air Force Base, Florida
… as tortoise habitat. In Chapter 3, I compared surface activity patterns of juvenile Gopher Tortoises between forested and test range vegetation types, as surface activity in these vulnerable, but important size classes may affect survival rates. I found that test ranges generally had greater …
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Molecular fundamentals of foam fractionation
… solutions is a process dedicated to separate surface active molecules from each other due to their differences in surface activities. The process is based on forming bubbles in a certain mixed solution followed by detachment and rising of bubbles through a certain volume of this solution, and …
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Physiological and behavioral consequences of reptilian life in the slow lane: Ecology of beaded lizards and rattlesnakes.
… ecology and energetics of species with very low activity levels. I investigated the ecology and energetics of two such reptilian groups: helodermatid lizards, and viperid snakes. I radiotracked Mexican beaded lizards and three rattlesnake species in their natural environments to determine their …
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Field Behavior Comparison of 8 Species of California Desert Ants
… three study sites in southern California. Hourly activity was monitored during winter and spring.</p> <p>The time outside the nest ranged from strictly diurnal in Pogonomyrmex californicus to bimodal to nocturnal in Pheidole barbata. Four aspects of surface activity, foraging, nest work, …
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The effects of annealing on phase transformation in platinum-molybdenum coatings
… of ordered phases increases the strength and surface hardness and could also have an impact on surface activity and chemical properties. The changes in mechanical, physical and chemical properties could be of significant importance in enhancing the performance of platinum-based systems in …
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Hyperbranched polyglycerol surfactants: a modular approach
… points, salt stability, emulsion stabilization, surface tension modification, greater surface activity at the critical aggregation concentration, and developing trends based on structure/property relationships. First, more conventional surfactants were synthesized by hydrophobic-tail initiated …
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Water splitting for hydrogen and syngas production over a novel bi-layer perovskite membrane
… demonstrate different properties on the two surfaces. The bi-layer membrane configuration is thermodynamically favorable for water reduction. Meanwhile, the second layer of LSCo at the sweep side surface enhances the surface activity for oxygen dissociation. The two materials LSCC and LSCo …
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Dynamic and equilibrium adsorption behaviour of ß-lactoglobulin at the solution/tetradecane interface: Effect of solution concentration, pH and ionic strength
… and the effect of solution pH on the protein surface activity was qualitatively analysed. In the presence of 10 mM buffer, we observed that generally the adsorbed amount is increasing with increasing BLG bulk concentration for all three pH values. The adsorption kinetics at pH 5 result in the …
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Investigation of Asphaltene Adsorption at Liquid-Liquid and Liquid-Solid Interfaces
… leading to the change in reservoir rocks’ surface wettability and the blockage of the production facilities. Hence, it is crucial to understand the mechanism of asphaltenes adsorption at the water-oil interface and their deposition onto the solid surfaces, and investigations are reported …
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An investigation of phase transfer catalysis employing quantitative structure-activity relationships
The application of quantitative structure activity relationships to phase transfer catalysis (PTC) has been explored. The primary focus was on hydroxide-initiated PTC reactions, such as enolate alkylations. The tandem [4+2]/[3+2] cycloaddition of nitroalkenes was applied as the key transformation …
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Identification and Reduction of the Alpha Background, From 238U and 232Th Decay Chains, in the DEAP-3600 Experiment.
… sanding robot, aimed at reducing radiogenic surface contamination, which removed 506$\pm$50 $\mu$m of acrylic from the inner-most portion of the detector surface. Furthermore, different analysis tools were developed and used during different phases of the experiment to measure the remaining …
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Hypercoiling and hydrophobically associating polymers : interfacial synthesis, surface properties and pharmaceutical applications
… (66-75%) of the ethyl ester side chains. Surface or interfacial tension/pH profiles were used to assess the conformation of both the poly(isophthalamides) and partially saponified PLETESA in aqueous solution. The results demonstrated that a loss of charge from the polymer was accompanied …
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Nuclear magnetic resonance studies on phospholipid membranes using paramagnetic ions
… A mechanism is proposed in terms of a membrane surface activity of these drugs.<br/><br/>The results show that in general the aim of the project has been justified in that a successful application of the lanthanide-ion-nmr method has been made and useful conclusions reached in each of the areas …
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