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 “"chronic toxicity"”.
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Amelioration of acute and chronic toxicity of imidacloprid by dietary phytochemicals in honey bees (apis mellifera)
… in the presence of imidacloprid, both acute and chronic toxicity bioassays were conducted. Honey bee imidacloprid LC50 values, the median lethal concentrations, were determined in the presence of field-realistic levels of quercetin and/or p-coumaric acid. Additionally, longevity assays were …
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Development of an embryo-larval chronic toxicity test using the sea urchins Tripneustes gratilla and Echinometra mathaei
Toxicity tests use organisms to assess the effects of the bioavailable fraction of toxicants in effluents and environmental media, such as water and sediment. Test organisms must be highly sensitive and ecologically relevant. Gametes of the sea urchins Echinometra mathaei and Tripneustes gratilla …
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Chronic toxicity of phthalates, biphenol and a Canadian bottled water stored under different light regimes using the Cnidarian Hydra Viridissima©
… to bottled water and plastic leachates caused toxicity to the freshwater Cnidarian Hydra viridissima (green hydra). Three chemicals used in the production of polycarbonate and polyethylene plastics, bisphenol A (BPA) and two phthalate esters: dibutyl phthalate (DBP) and bis (2- ethylhexyl) …
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The anticancer potential of CITme, a quinoline derivative
… CITme with regard to antitumour activity, toxicity and pharmacokinetics. In vitro screening for neoplastic cytotoxic effects using standard cell culture techniques revealed cytotoxic activity against HeLa, DU-145, MCF-7, Jurkat and CoLo 320 human derived cancer cell lines at low …
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Potential Coal Slurry Toxicity to Laboratory and Field Test Organisms in the Clinch River Watershed and the Ecotoxicological Recovery of Two Remediated Acid Mine Drainage Streams in the Powell River Watershed, Virginia
… Honaker, Virginia were evaluated for acute and chronic toxicity using field and laboratory tests. The results of the study suggested that the primary effluent from the coal preparation facility had acute and chronic toxicity; however, the settling pond system utilized at this plant mitigated the …
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Investigation into three potential modifying factors in larval fathead minnow (Pimephales promelas) growth and survival
The responses of larval fish to toxicants in subchronic toxicity tests may be modified by events and stressors not associated with the toxicants themselves. In the following work, three potential modifying factors related to larval fish growth, survival, and response to toxicant stress were …
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An Ecotoxicological Assessment of a Treated Coal-mining Effluent in the Leading Creek Watershed, Meigs County, Ohio
… and the associated acid drainage and metals toxicity. Treated discharges from active mining and preparation facilities, however, can also impair lotic ecosystems through total dissolved solids (TDS) toxicity, caused primarily by the reagents used for pH modifications and the oxidation of …
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The effects of select non-steroidal anti-inflammatory drugs on green and brown hydra
… several NSAIDs were assessed for their potential toxicity to Hydra. Chronic toxicity was evaluated using three NSAIDs on two different species of Hydra, Hydra viridissima and Hydra littoralis. Several negative correlations were observed between ibuprofen, naproxen, diclofenac toxicity and select …
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One Size Doesn't Fit All: Developing Bioavailability-based Models for Zinc Toxicity to Microalgae
… parameters that are known to modify zinc toxicity to aquatic organisms. To develop national zinc water quality guidelines that account for a range of water chemistries and are relevant to Australian freshwater conditions, a detailed understanding of how water chemistry influences zinc …
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Utilization of mitochondrial and microsomal metabolism for the assessment of toxicity
Short-term toxicity tests utilizing mitochondrial and microsomal metabolism were developed and applied to a series of eight quinones. In the mitochondrial assay, the degree to which test compounds inhibited mitochondrial respiration varied from an EC50 of 9 μM to l25 μM. In the microsomal assay, …
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Avaliação preliminar da contaminação por BTEX, em água subterrânea de poços tubulares, no município de Natal-RN
… important because of its toxic potential. This toxicity is attributed to the presence of substances such as benzene and its derivatives are very toxic to the central nervous system of man, with chronic toxicity, even in small concentrations. The area chosen for study was the city of Natal, …
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Effects of copper on benthic communities in artificial microcosms
… at concentrations well below measures of chronic toxicity to organisms dependent on periphyton as a trophic resource and the chronic criteria for copper. As such, greater emphasis should be placed on the sensitivities of periphyton communities in future copper criteria determination.
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The opportunistic green : building on Toronto's utility corridor
… most profane areas of the city, associated with chronic toxicity, could be transformed into one of its most desirable neighborhoods.
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Bioavailability and toxicity of nickel to freshwater organisms : a modeling approach
… fact that the bioavailability and hence also the toxicity of many metals is largely influenced by physicochemical parameters such as water hardness, pH and dissolved organic matter. Consequently, a single water quality criterium may be too conservative for certain water bodies whereas it may not …
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Denitrifying woodchip bioreactors for aquaculture manifold design and potential water reuse
… flushed generally within 21 pore volumes (21 d). Toxicity testing with the indicator species Ceriodaphnia dubia showed no acute toxicity after five cumulative pore volumes were eluted, but chronic toxicity was observed after restarting bioreactors following a 72-h dry period. Optimal water quality …
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Experimental testing and modeling of partial nitrification at different temperatures
… at a low temperature. Lastly, acute and chronic toxicity of nickel to nitrifiers was inverstigated. Chronic toxicity of nickel to nitrification of low ammonia synthetic wastewater was investigated at 10oC in two iii SBRs with 1 mg/L nickel dosing either from the beginning or after biomass …
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Development, Growth, and Behavioral Ecology of Walleye as Influenced by Sublethal Exposure to Dietary Selenium
… could be drawn from the data. Acute and chronic toxicity of chemicals to the aquatic environment is of great concern to aquatic life which depends upon the water to survive. Many species have been tested for the acute concentration of chemicals that will kill fifty percent of the test …
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Identification of Ecosystem Stressors in Developing an Enhancement Plan for the Leading Creek Watershed, Meigs County, Ohio
… has shown significant problems relating to toxicity and habitat degradation in the watershed. Seventeen tributaries and ten mainstem stations were chosen to receive monthly monitoring as point source discharges, including biological, chemical, toxicological, and hydrological sampling. …
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Total N-nitrosamine Precursor Adsorption with Carbon Nanotubes: Elucidating Controlling Physiochemical Properties and Developing a Size-Resolved Precursor Surrogate
… N-nitrosamines may comprise the bulk of the chronic toxicity in treated drinking waters despite forming at low ng/L levels. This research seeks to elucidate physicochemical properties of carbon nanotubes (CNTs) for removal of DBP precursors, with an emphasis on total N-nitrosamines (TONO). …
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LIQUID PLASTICS AS A NEW ENVIRONMENTAL PROBLEM? AN INTEGRATED RISK ASSESSMENT OF POLYVINYL ALCOHOL, POLYETHYLENE GLYCOL, POLYVINYL PYRROLIDONE AND POLYACRYLIC ACID
… ecosystems. This study aimed to evaluate the ecotoxicity of four commonly used WSPs—polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), polyethylene glycol (PEG), and polyacrylic acid (PAA)—using the freshwater fish Danio rerio and the crustacean Daphnia magna as model organisms. The impacts …
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