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 18 of 18 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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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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Die Wirkung estrogen aktiver Umweltchemikalien auf Fische : Untersuchung reproduktionsrelevanter Parameter bei Regenbogenforelle und Zebrabärbling
… des Zebrabärblings war die endokrine Wirkung von Nonylphenol (NP), Octylphenol (OP) und Dehydroepiandrosteron (DHEA) auf Fische nachweisbar. Die Untersuchung ausgewählter entwicklungs-biologischer, reproduktionsbiologischer, anatomischer, histologischer und ultrastruktureller Parameter ermöglichte …
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Ökotoxikologische Untersuchungen zur Wirksamkeit endokrin aktiver Substanzen auf Fische
… Regenbogenforellen reagierten nach Belastung mit Nonylphenol (NP)bzw. 17a-Ethinylestradiol (EE2) mit ei-nem alters- und dosisabhängigen Anstieg des PVG. Eine Exposition juveniler Karpfen und adulte männliche Regenbogenforellen ergab für NP- und EE2-haltige Klärabwässer einen deutlich schwächeren …
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Neurotoxicity of environmental pollutants
… such as hexabromocyclododecane (HBCD) and 4-nonylphenol (4-NP) induce cell death (apoptosis) by caspases activation (Casp-8, Casp-9 and Casp-3) and cytochrome c release at low micromolar concentrations (IC50 ~ 4μM and 6μM, respectively). Consequently this study also showed that these …
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A study of the distribution of selected anthropogenic micropollutants in the seawater of Dublin bay
… estradiol, ethynylestradiol, ibuprofen and nonylphenol. Dublin bay was chosen as a sampling site. HPLC methods for the identification and the quantification of each of these compounds were developed. The method for the detection of caffeine had a limit of detection (LOD) of 0.005 mgL-1 and a …
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Development and applications of electrically driven separation methods.
… is reported. The surfactants, commercial nonylphenol ethoxysulphates (NEPOSp) and sulphonates (NEPOS), have been separated by reversed type CZE and the surfactants were also analysed then by mass spectrometric detection on a triple quadruple mass spectrometer using home-built co-axial …
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The analysis of salt resistant surfactants used in enhanced oil recovery.
Commercial nonylphenol ethoxysulphonate (NPEOS), octylphenol ethoxysulphonate (OPEOS) surfactant formulations and mixtures of alkyl aryl sulphonate and NPEOS surfactant formulations, are used for enhanced oil recovery (EOR). The surfactants have been analysed by liquid chromatography (LC), liquid …
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Chemical Mixtures of Xenoestrogens and Their Metabolites Alter Estradiol-Induced Non-Genomic Signaling
… a BPA substitute, has unknown endocrine actions. Nonylphenol is a surfactant and a ubiquitous contaminant. Our goals were to use a well-characterized estrogen-responsive cell model, the GH3/B6/F10 pituitary line, to characterize the potentially potent nongenomic signaling and functional responses …
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Ecotoxicological Investigations in Effluent-Dominated Stream Mesocosms
… (VTG) in male fathead minnows. Steroids, nonylphenol ethoxylate metabolites, and other unidentified compounds were identified as causative effluent estrogens. These findings suggest that in vivo VTG bioassays should be used to confirm in vitro Yeast Estrogen Screening assay activity when …
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The nongenomic effects of physiological and environmental estrogens on dopamine transporter function
… plastics manufacturing by-products/detergents (nonylphenol, bisphenol A), and the synthetic estrogen DES for effects on DAT function. We characterized membrane estrogen receptors (ERs) and their responses using a nontransfected continuous rat cell line (PC12). We showed that PC12 cells express …
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Impact of Oxygen and Pesticides on Microbial Cellulose Degradation in Aerated Agricultural Soils: A Microscaled Analysis of Processes and Prokaryotic Populations
… experiments. The pesticides Bentazon, MCPA and Nonylphenol impaired cellulose-linked microbial processes only at pesticide concentrations far above the recommended rate. The impairment was most pronounced under anoxic conditions. Planctomycetaceae and the new family-level taxon 'Sphingo1-4' were …
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ASSESSING THE IMPACT OF EMERGING CONTAMINANTS ON ANAEROBIC MICROBIAL COMMUNITIES
The impact of emerging contaminants on anaerobic microbial communities is critical and