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 33 for “"nonylphenol"”.
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Oxidation of Bisphenol A, Triclosan and 4-Nonylphenol by Fe-B* activated peroxide
… used Bisphenol A (BPA), triclosan (TCS) and nonylphenol (NP) are commonly encountered as contaminants in wastewater and surface water as a result of their incomplete treatment in traditional water treatment facilities. The presence of these compounds in our water resources poses direct threat …
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Sorption of a branched nonylphenol isomer and perfluorooctanoic acid on geosorbents and carbon nanotubes
As metabolites of organic surfactants, both nonylphenol (NP) and perfluorooctanoic acid (PFOA) are toxic and ubiquitous in the environment. Their sorption on soils and sediments is of importance for their fate and transport in the environment. Especially in China, there is still a lack of …
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Schicksal von 4-Nonylphenol und Bisphenol A im System Boden/Klärschlamm bei der landwirtschaftlichen Klärschlammverwertung
The fate of the important industrial chemical nonylphenol and bisphenol A which were enriched during wastewater treatment processes and exposed to the environment using sewage sludge as an agricultural fertilizier were studied. Adsorption and degradation experiments were performed with …
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The influence of sewage sludge treatment on the fate of nonylphenol in sludge amended soils
… and fate of a major sludge organic pollutant (Nonylphenol, NP) in sludge-amended soils and b) to provide, if possible, clues about the mechanism driving this correlation. In view was a contribution to predicting and controlling the fate of organic xenobiotics in the soil-sludge environment, by …
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Metabolism of nonylphenol by human P450-recombinant yeast and assessment of the xeno-hormone potency of different isomers and their chlorinated derivates
… and the metabolites or derivatives of 4-nonylphenol isomers (4NP) regarding the risk of exposure for human health to these compounds. The development of efficient molecular tools, making it possible to analyze individual bioconversion steps by well-characterized enzymes, such as …
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Organic-geochemical investigations on the mode of incorporation of a defined nonylphenol isomer and the herbicide MCPA in soil derived organo-clay complexes
… soil. The first approach showed, that both 353-Nonylphenol (4-(3,5-dimethylhept-3-yl)phenol) and MCPA (4-chloro-2-methylphenoxyacetic acid) rapidly (48 h) formed non-extractable residues, especially in the clay fraction. A separation of organo-clay complexes in distinct sub-fractions by means of …
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Metabolismus und Verhalten definierter Nonylphenolisomere in Belebtschlamm
… of this work was to examine the fate of defined nonylphenol-isomers in activated sewage sludge. This was performed with the use of 14C-marked isomers which could directly compared to each other . Moreover the behavior of NP-solutions in water were analysed relating to absorption. As a result …
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Establishment of a systematised approach for the development of novel diagnostics and therapeutics in the field of biotechnology
… this thesis was to generate an antibody against Nonylphenol for later use in biofilters for the elimination of Nonylphenol from waste water. For this purpose mice were immunised following different strategies. The immunisation according to High Zone Tolerisation led to the best results regarding …
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Einfluss von Mikroorganismen und Organo-Ton-Komplexe auf die Bildung von nicht-extrahierbaren Rückständen im Boden unter Verwendung von 14 C-Nonylphenol und 14 C-MCPA als Modellsubstanzen
The aim of this study was to measure the effect of microorganisms and organo-clay complexes on the formation of non-extractable residues (NER) of soil. For the purpose of these investigations two test chemicals, 4(3’,5’-dimethyl-3’-heptyl)-phenol (p353-NP) and 2-methyl-4-chlorophenoxyacetic acid …
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Untersuchungen zur metabolismus-bedingten Insektizid-Resistenz von Drosophila melanogaster als Beispiel für den Einsatz Cytochrom P450-transgener Zellsuspensionskulturen von Nicotiana tabacum zur Aufklärung der enzymatischen Kapazität des Ursprungsorganismus
… resistance towards methoxychlor. Using 4-n-nonylphenol, a substrate of CYP71U4v2, which was shown to be overexpressed in barley during pathogen defence, was finally identified. Cyp71u4v2-transgenic culture formed the main metabolites 4’-hydroxy-4-n-nonylphenol and 5’-hydroxy-4-n-nonylphenol …
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Water quality studies in Kranji Catchment, Singapore : use of organic tracer and PEDs for identifying potential sewage sources
… The compounds chosen as potential tracers were nonylphenol and nonylphenol ethoxyltes (NPEOs), as these are indicative of sewage and have been found at measurable concentrations in rivers and streams elsewhere in Asia. Polyethylene devices (PEDs) were used as passive samplers to measure NPEOs in …
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Surfactants at fluid interfaces: molecular modeling and deep learning
… to an initial linear decrease in slippage, with nonylphenol being more effective than phenol. As surfactant concentration increases, the reduction in slip length slows, ultimately plateauing at 1.4 nm and 0.5 nm for nonylphenol and phenol, respectively. The mechanisms underlying these slip …
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Quantitative Model for the Prediction of Hydrodynamic Size of Nonionic Reverse Micelles
… polar phase. The basis of our investigation was nonylphenol polyethoxylates - NP4 and NP7. Micelle sizes were determined using dynamic light scattering (DLS). A central composite experimental design was used to quantitatively model reverse micelle size as a function of ω, [NP], and r. The model …
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Polymer Chemistry for Improved Self -Healing Composite Materials
… system based on WCl6, phenylacetylene, and nonylphenol has also been developed. In addition to these microcapsule-based materials, work toward self-healing based on stress-activation of polymerization is described. As a prerequisite to developing this technology, demonstration and …
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Multimethode zur Bestimmung von endokrin wirksamen Substanzen in Wasser
… Konzentrationen an Estradiol, Ethinylestradiol, Nonylphenol, Phthalaten, Bisphenol A und DDT in den Oberflächengewässern sind jedoch stellenweise in der Lage, endokrine Effekte in Fischen und anderen aquatischen Organismen zu bewirken. Zusätzlich wurden Literaturdaten von anthropogenen EWS in der …
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Entwicklung und Anwendung chemisch-analytischer Verfahren zur Bestimmung endokrin wirksamer Substanzen
… From the abundance of the EDCs the xenoestrogens Nonylphenol, Bisphenol A and Octylphenol as well as the estrogens Estrone, 17beta-Estradiol, Estriol and 17alpha-Ethinylestradiol was selected. These substances possess a high environmental relevance. They will either manufacture in large quantities …
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