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 28 for “"ionic composition"”.
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Effect of ammonium and nitrate on nitrogen fixation and mineral nutrition of ryegrass and uninoculated and inoculated clover grown separately and in association : A dissertation submitted in partial fulfilment of the requirements for the Degree of Bachelor of Agricultural Science (Honours) in the University of Canterbury
… investigation presents data on the growth and ionic composition of ryegrass (Lolium perenne L.), and uninoculated and inoculated white clover ( Trifolium repens L.) plants, grown in nutrient solutions containing either NH₄- or No₃-N. The effect of increasing nitrate concentrations on the growth …
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Excitation-Contraction Coupling: The Effect of Calcium Channel Antagonistic Drugs on Reprimed and Inactivated Skinned Skeletal Muscle Fibers
… fibers can be elicited by sudden changes in the ionic composition of the myoplasm. The bulk of evidence in the literature suggests that such contracture of skinned fibers is triggered by depolarization of resealed transverse tubules. If this hypothesis is true, then such contractures of skinned …
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Hydrogeologic assessment of three solid waste disposal sites in the Brazos River alluvial deposits.
… recharge. Chemical analyses indicate that the ionic composition of the groundwater in the alluvial aquifer is highly variable over short distances. Groundwater chemistry varied at the three disposal sites in relation to groundwater flow. Up-gradient wells exhibited a calcium bicarbonate …
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Studies on the characterization of a soluble factor of a sodium-activated, magnesium-dependent adenosinetriphosphatase in rat cerebral cortex
… of ions. This tends to explain the fact that the ionic composition of the cytoplasm of the animal cell differs from its external fluid environment.</p><p>It is well know that where sodium is the principal cation of the extracellular fluid, potassium has such a role inside the cell. Since there …
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Sessile droplets of salt solutions on inert and metallic surfaces
… by surface tension gradients induced by ionic composition changes during the course of the corrosion process and migration of cations towards the droplet perimeter. Finally we investigate the corrosion behaviour under drying salty sessile droplets on metallic surfaces. The corrosion …
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Development of planar patch clamp with potentiometric calcium ion-selective electrode
… skilled personnel and inability to identify ionic composition of electrophysiological events. Many different materials and fabrication methods have been introduced to replace traditional patch clamp setup to overcome limitations.^ In this dissertation, a planar patch clamp device with calcium …
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Changes in archaeal and bacterial community composition following entombment in halite crystals
… depending on the environmental conditions (e.g. ionic composition and water activity) at the point of halite precipitation.
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Acid Leaching of SHS Produced MgO/TiB2
… mass spectrometry (ICP) was used to analyze the ionic composition and extent of leaching. Scanning electron microscopy (SEM) was used to observe the particle morphology of the leached powders.
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Physiochemical Treatment Options for High-Conductivity Coal Mining Runoff
… of empirical equations which predict SC using ionic composition for natural waters with a low to medium SC. The physicochemical treatment methods tested were ion exchange, excess lime-soda softening, and the Cost Effective Sulfate Removal (CESR) process. Both cation (H⁺ exchanger) and anion …
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The development of motility in spermatozoa
… initiated upon their release into sea water. The ionic composition of sea water plays an important role in this activation and it is evident that the presence of Na+ is vital for the Initiation of motility. This study shows that a Na+/H+ exchanger, a N+-dependent bicarbonate/chloride exchanger and …
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Desalination of brackish groundwater in the United States : minimum energy requirements
… make brackish groundwater potable. Because the ionic composition of groundwater varies significantly from location to location, unlike seawater, conducting site-specific analyses of the resource across the U.S. is necessary. This thesis uses chemical and physical data from a U.S. Geological …
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Effects of polyphosphates on frozen chickens.
… which affect WHC and the lipid and fatty acid compositions of chicken tissues are discussed; as is the mechanism of the autooxidation reaction, and the theories about the mode of action of polyphosphates. Lipid and fatty acid compositions were determined by chromatographic methods. The degree …
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A CHARACTERIZATION OF THE BACTERIOPHAGE 41C AND ITS LYTIC CYCLE IN BACILLUS SUBTILIS 168
… may have occurred due to differences in the ionic composition of the cells.</p><p>A characterization study of phage 41c was also conducted. Phage 41c produced a burst size of 10('3) phage per host cell, following a latent period of 50 minutes. In addition, phage 41c (a double-stranded DNA …
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Aspects of bioorganic chemistry - a). Development of caffeine-aptamer for coffee decaffeination; b). Study of 1,8-naphthalimide derivatives as fluorescent probes; c). Encapsulation of DNA by silica nanoparticles
… compounds were used for aptamer selection. The ionic composition of medium roast coffee grinds was determined by ICP-MS. In addition, the amounts of caffeine and theophylline in these brews were also determined by UV/vis and HPLC. The work described in this thesis provided the foundation for …
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Chemical and enzymatic modification of whey proteins
… concentration, enzyme to substrate ratio and ionic composition. Correlation of the enzymes' mode of action on whey proteins to their hydrolytic power was studied in comparison to other proteins with different molecular structures. Separation and recovery of the hydrolyzed fractions was …
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Irreversibilities and nonidealities in desalination systems
… the importance of irreversibilities and solution composition to the actual performance obtained. Least work of separation for a desalination system is derived and generalized to apply to all chemical separation processes driven by some combination of work, heat, and chemical energy (fuel) input. …
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Sorption of Cadmium, Copper, Lead, and Zinc as influenced by pH, ionic strength and selected soil components
… is influenced by several factors, including pH, ionic strength, the presence of ionic composition or organic ligands, total amount of metals, and adsorbent loading. These conditions should be considered when evaluating metal sorption capacity of soil material or when applying laboratory results …
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Rotavirus interactions with silica and natural organic matter
… and no adhesion during retraction even at high ionic strength. Attractive forces were observed between rotavirus and CRW during approaching and high adhesion during retraction. These results indicate two different mechanisms based on the dissimilar characteristics of the two NOM isolates. …
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A Study of Ionic Permeability Changes Underlying Excitation in Myelinated Nerve Fibers of the Frog
… action potential at the node of Ranvier upon the ionic composition of the bathing medium provided evidence that the electrical activity resulted from a sequential alteration of the membrane permeability to sodium and to potassium ions. Their results suggested that the nodal membrane conformed in a …
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Spontaneous activity in the mouse visual cortical slice: biophysical characterization and pathophysiology
… slices. Here, I find extreme sensitivity to the ionic composition of the artificial cerebral spinal fluid (aCSF) bathing the slices. Lower, more physiologic concentrations of extracellular divalent cations render extratelencephalic layer 5 pyramidal neurons intrinsically active by altering the …
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