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 128 for “"complex mixtures"”.
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PHASE EQUILIBRIUM COMPUTATIONAL ALGORITHMS OF COMPLEX MIXTURES.
PHASE EQUILIBRIUM COMPUTATIONAL ALGORITHMS OF COMPLEX MIXTURES.
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Characterisation of unresolved complex mixtures of hydrocarbons
… oils) often display "humps" or Unresolved Complex Hixtures (UCHs) when analysed by gas chromatography (CC). Although widespread and often abundant, to date little is known of their detailed molecular composition. Standard chromatographic methods of isolation of model aliphatic and aromatic …
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Characterisation and environmental effects of unresolved complex mixtures of hydrocarbons
… is commonly referred to as the unresolved complex mixture (UCM). UCMs are thought to result from the co-elution of complex mixtures of hydrocarbons with similar chemical properties and become more obvious as resolved components are removed by processes such as weathering and refining. …
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Characterisation of unresolved complex mixtures of hydrocarbons by degradative methods
Unresolved Complex Mixtures (UCMs) of hydrocarbons are found in crude and refined oils and in water, sediments and biota polluted with oils. The concentrations of UCMs in oils are significant (e. g. >65% of the aliphatic hydrocarbons in fresh Kuwait crude) and it is perhaps surprising that …
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Synthesis, Fractionation, Characterisation and Toxicity of Naphthenic Acids from Complex Mixtures
… and the associated polluted production waters, complex mixtures of acids, known historically as naphthenic acids (NAs), have achieved prominence. This is particularly because NAs have been designated a toxicant class of concern in the oil sands process-affected water (OSPW) that has accumulated …
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Development of a surface-enhanced Raman sensor for detection in complex mixtures.
… surface-enhanced Raman scattering detection in complex mixtures that have emerged in the last 10 years. SERS been employed for small molecule detection all the way to more complex systems, such as detection in living cells, and this chapter reviews the recent advancements and looks toward the …
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Biodegradation, water solubility and characterisation studies of unresolved complex mixtures (UCMs) of aromatic hydrocarbons
… volatile hydrocarbons leaving an unresolved complex mixture (UCM) comprising the more environmentally persistent components. Aromatic UCMs have been reported in a wide variety of environmental matrices. Recent studies indicate such material, particularly monoaromatic hydrocarbons, is …
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Studies of the synthesis, environmental occurrence and toxicity of unresolved complex mixtures (UCMs) of hydrocarbons
The occurrence of unresolved complex mixtures of hydrocarbons (UCMs) in the aliphatic fraction of marine sediments and organisms from areas impacted by petroleum hydrocarbons is well documented and widely accepted as an indication of fossil fuel contamination. In contrast, the presence of an …
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Unresolved complex mixtures of aromatic hydrocarbons in the marine environment : toxicity, solubility and photodegradation studies
Unresolved complex mixtures (UCMs) of aromatic hydrocarbons have been found in a wide range of environmental matrices at high concentrations. However, limited consideration has been given to the potential detrimental effects of the accumulation of these compounds in the marine environment. In …
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Selective Enrichment Through Capture (SEC): A Technology for Retrieving Specific DNA Sequences from Complex Mixtures
… to selectively target DNA sequences within a complex mixture is a useful feature for genomic studies. Several methods aimed at undertaking this feat have utilized biotinylated oligonucleotides and streptavidin beads to capture DNA but have low efficiencies, require PCR, or cannot be combined …
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In vitro toxicology of complex mixtures from drinking water disinfection and amine-based carbon capture systems
… can result from environmental factors. The complex network of integrated organ systems and metabolic pathways are altered by the presence of different agents, so it is possible that, in combination, the biological response to a series of agents might not be simply expressed as the sum of …
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Drinking water disinfection by-products: toxicological impacts and biological mechanisms induced by individual compounds or as complex mixtures
… induced by DBPs, and the overall toxicity of DBP complex mixtures are limited. The objectives of this dissertation were to i) analyze the occurrence and comparative toxicity of the emerging haloacetaldehyde (HAL) DBPs, ii) investigate the molecular mechanism of DBP-induced toxicity by the …
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Application and Evaluation of a Chemical Modification- and Mass Spectrometry-Based Thermodynamic Assay for the Study of Protein-Ligand Interactions in Complex Mixtures
… focusing was employed to decrease sample complexity prior to LC-MS/MS analysis and it was found to generate a ~2-3 fold improvement in proteomic coverage, however when combined with the methionine enrichment strategy the improvement was ~6-fold as the benefits of both were additive. Third, …
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MASS SPECTROMETRIC STUDIES ON PETROLEUM ASPHALTENES AND ORGANOSULFUR COMPOUNDS, ON FUNCTIONAL-GROUP SELECTIVE ION-MOLECULE REACTIONS AND ON GAS-PHASE REACTIVITY OF META-BENZYNES TOWARD AMINO ACIDS
… chromatography, analysis of minor components in complex mixtures is possible. In addition to the molecular weight information, mass spectrometers can provide structural information for the ionized analyte molecules. However, mass spectrometric analysis of complex mixtures is not without …
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Synthesis and evaluation of N-3,5-dinitrobenzoyl-beta-amino acid derived chiral stationary phases
… rapid analysis time, the ability to separate complex mixtures, reproducibility, flexibility and economy are extended to the problem of enantiomeric resolution when CSPs are employed.
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Synthesis and analysis of polyphenyl compounds and their derivatives
… theme of analysis and understanding of complex mixtures. The analysis of complex mixtures is not only an academic pursuit but something of value to industry. Individual components of complex systems may have advantageous or detrimental effects to the overall performance of materials. …
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Capillary Zone Electrophoresis Studies of Sulfur Containing Compounds
Up to this point in time, complex mixtures of tertiary sulfonium ions have been separated or analyzed employing conventional methods like HPLC or NMR procedures. In this thesis the researcher presents a new approach, the use of Capillary Zone Electrophoresis (CZE) for the analysis of these types of …
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MASS SPECTROMETRIC INVESTIGATIONS OF STRUCTURALLY DIAGNOSTIC ION-MOLECULE REACTIONS AND OF MOLECULAR STRUCTURES OF ASPHALTENES
… characterization of components of complex mixtures due to its ability to study ionized molecules with high sensitivity, selectivity and specificity. By combining MS/MS with liquid chromatography (LC) to enable front end separation of complex mixtures, trace level analysis of …
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Applications of fluorescence detected sedimentation I Studying the thermodynamic impact of valence in non-ideal solutions II High affinity interactions and biological media
… macromolecules can allow elegant dissection of complex assemblies. The only limiting factor is the researcher's ability to label the macromolecule of interest. In addition to high affinity interactions, selective labeling of the macromolecule of interest with either a synthetic fluorophore or …
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Formulation of electrophoretic module for integration onto silicon-on-insulator neural probes
… separation efficiency and ability to analyze complex mixtures at a small scale [1]. However, challenges remain when it comes to scaling CE systems to match the demands of specific applications, particularly in situations where sample volume is constrained, such as brain research. This thesis …
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