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Showing 1 to 19 of 19 for “"silicic acid"”.
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Silicic acid, its influence and removal in water purification
Made available in DSpace on 2017-11-30T21:03:37Z (GMT). No. of bitstreams: 2 6001933.pdf: 5805844 bytes, checksum: 8eefa850c70a1d1c28f71fac3a90e0c1 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1919
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Competitive Adsorption of Arsenite and Silicic Acid on Goethite
The adsorption behavior of silicic acid and arsenite alone and competitively on goethite over a broad pH range (3-11) at environmentally relevant concentrations was investigated utilizing pH adsorption data and zeta potential measurements. Both addition scenarios (Si before As(III) and As(III) …
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Studies on the fatty acid composition of human serum with special reference to the influence of hormones and other agents
… technique for separation of serum free fatty acids (FFA), t riglycerides, phospholipids and cholesterol esters by adsorption chromatography on a system of two columns, silicic acid and Florisil, has been elaborated for preparing samples for gas-liquid chromatographic analysis of serum lipid …
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Melt Synthesis, Structural, Characterization and Scaling of Swelling 2:1-Layer Silicate Materials
… carbonate Na2CO3, lithium carbonate Li2CO3, and silicic acid SiO2∙nH2O via melt synthesis in an open glassy carbon crucible at 1075 °C under flowing argon in a high frequency induction furnace, where the temperature was increased with a constant rate of 300°C/hr. (ii) dehydration and …
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Coupling source term, mineral reactivity and flow in radionuclide transport
… by an increase in the concentration of silicic acid. This suggests that the solution activity of silicic acid at a higher temperature has a weak influence on the release of the mobile elements. The forward dissolution rate measured in LSSR simulant groundwater was found to be slightly …
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The Distribution of Dissolved Barium Along the U.S. Geotraces North Atlantic Transect: Impact of Biogeochemical Processes, Circulation and Phase Association
… and similar to the nutrient-like profiles of silicic acid and alkalinity. To better constrain the uses of Ba, trace element clean samples were collected during the North Atlantic US GEOTRACES cruises.</p> <p>The cycling of barium in the North Atlantic region was found to be a complex …
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Engineering diatom peptides for the synthesis of silica nanomaterials
… modified silaffin peptides that nucleate silicic acid. Designing these peptides would enable the production of silica nanostructures with desired properties; however, the functional effects of the modifications are poorly understood. In this thesis, I use Escherichia coli to express and …
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Allelopathic effect of imperata cylindrica (L.) beauv. extracts on the germination of weeds
… presence of allelochemicals including phenolic acid, fatty acids, and organosilicon compounds. Although phenolic acids [butyl phenol, phenyl 3-methylbut-2-enoate, p-coumaric acid, and p-coumaric acid methyl ester], fatty acids [phytol, methyl isohexadecanoate, palmitic acid, palmitic acid methyl …
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Integrating polarisation effects into non-polarisable models to better model the self-assembly of mesoporous silica nanomaterials
… was then used to propose a molecular model for silicic acid, the principal precursor in the synthesis of mesoporous silica, via transferability. In future, we plan to expand our proposed transferable force field to a wider range of organosilica molecules, thereby facilitating the simulation of …
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The Chemical Synthesis of Model Catalysts Related to Enzymes
… synthesized from α-ethyl carbobenzoxy-aspartic acid by conversion of the β-carboxyl group to an acid chloride and treatment with diazomethane followed by hydrogen chloride. As a pilot synthesis, the chloromethyIketone was caused to react with N-benzylphenylacetamidine to produce …
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Isolation and lactose metabolism of Streptococcus lactis variety tardus from southwestern Virginia
… lactis var. tardus cultures was accomplished by silicic acid column chromatography of the spent lactose-phosphate-yeast extract media. Two cultures of S. lactis var. tardus were isolated from parent§_. lactis cultures that were being transferred in litmus milk rehydrated with distilled water …
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Studies in vibrofluidized beds and synthesis of silica catalysts
… the interlayer spacing of H-Magadiite (a layered silicic acid) by the introduction of pillars containing silicon atoms was investigated. A trisiloxane and two trichloroorganosilane compounds were used as the pillaring agents. The interlayer space of H-Magadiite was successfully expanded by …
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Phytoplankton dynamics in the northeast subarctic Pacific during the 1998 El Niño, the 1999 La Niña and 2000 with special consideration to the role of coccolithophores and diatoms
… 0.2 to 4.7 mmol Si m⁻² d⁻¹ between 1999-2000. Silicic acid and nitrate were never limiting at all stations in Feb. and generally increased in concentration along Line P during all seasons.
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Identification and characterization of an enterocyte receptor for group A porcine rotavirus
… fraction by Sephadex partition, ion exchange, silicic acid, and thin-layer chromatography, blocking activity behaved as a monosialylganglioside (GMX) that displayed a thin-layer chromatographic mobility between that of GM2 and GM3. Inhibition of blocking activity by treatment of GMX with …
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Alkali Silica Reaction Mitigation Using High Volume Class C Fly Ash
… a neutralization reaction that occurs between an acid (silicic acid) and a basic pH pore solution (Calcium Oxide, Potassium Oxide, and Sodium Oxide). ASR causes deleterious expansion within concrete, which can cause durability issues decreasing the life span of concrete. ASR in concrete has been …
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SILICON ISOTOPE AND PETROGRAPHIC INVESTIGATIONS OF SILICIFIED CARBONATE ROCKS: IMPLICATIONS FOR IMPROVED PARAGENETIC SEQUENCING AND PROXIES FOR PALEOZOIC OCEAN CHEMISTRY
… open ocean water δ30Si(NBS28) of dissolved silicic acid. Further work is suggested to better constrain the temperature of silicification through the use of techniques such as triple O thermometry, and more detailed investigation of the Si isotopic fractionation amongst different fabrics of …
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Particle export and flux through the Mesopelagic in the high-latitude north and South Atlantic
… contrast, alleviating iron limitation in low silicic acid waters of the South Atlantic with very high copepod grazing pressure only caused a modest phytoplankton response and no enhancement of downward particle flux. This was probably primarily due to grazing control and detritus-feeding by …