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 11 of 11 for “"acute toxicity tests"”.
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The use of Chironomus riparius (Diptera: Chironomidae) in benthic toxicity tests and its response to selenium
… conducted to: 1. Develop a method for performing acute toxicity tests using Chironomus riparius. 2. Establish relationships between dry mass and selenium content, and between dry mass and selenium body burden. 3. Determine whether bioaccumulation or bioconcentration contributed more to the …
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Comparative Toxicity of Eight Model Substances to the Sediment Dwelling Invertebrates Lumbriculus variegatus and Chironomus riparius
Existing ecotoxicity data for chemicals vary to a high extent between the environmental compartments water and sediment, since the evaluation of contaminants has historically focused on water exposition. Many anthropogenic chemicals and waste materials, including toxic organic and inorganic …
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Ecological studies on:(a) the use of colonisation samplers in relation to biological surveillance of river water quality (b) the requirements of freshwater gastropoda
… fluviatilis were the least tolerant taxa. 96h acute toxicity tests of P. jenkinsi using ammonia and copper were carried out in a flow-through system after a variety of static range finding tests. P. jenkinsi was intolerant to both toxicants compared to reports on other taxa and the results …
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Acute and chronic effects of selenium on Daphnia pulex
Acute toxicity tests with selenium were conducted with three freshwater species. All data are expressed as selenite-selenium. Daphnia pulex had a 48 hr LC50 of 3.87 mg/l selenium. The 96 hr LC50 and EC50O values for Gambusia affinis and Physa sp. respectively, were 12.56 and 27.08 mg/l selenium. …
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Negative phototaxis of mosquito larvae as a potential tool in the rapid biological monitoring of aquatic wastes (Diptera: Culicidae)
A little-known approach to toxicity testing--based on negative phototaxis of larval <u>Aedes aegypti</u>--was investigated as a contribution to the search for rapid methods applicable to the field of water pollution control. Zinc and copper were the toxicants tested. All tests were conducted with a …
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Evaluation of Chelex 100 and Assessing the Impact of Fulvic Acid (NOM) on Copper Toxicity and Bioavailability to Americamysis bahia
… when either 12 or 24 mg/L NOM was present. Acute toxicity bioassays were performed with mysid shrimp (Americamysis bahia) to evaluate the toxic effects of copper in the presence of Suwannee River Fulvic Acid, which served as a source of NOM. Static or static renewal tests, based on EPA …
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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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Applicazioni innovative dell’ingegneria biomedica
… thesis is focused on the development of a new acute oral toxicological test in vitro, based on the use of human mesenchymal stem cells (hMSCs) and designed according to ICCVAM guidelines. These were drafted during the validation process of the two in vitro tests which are now approved and used, …
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Characterisation and fate of bleached kraft mill effluents from a New Zealand pulp and paper mill
… exhibited a lesser degree of alkaline lability. Acute toxicity tests on the monoterpene alcohols gave EC₅₀ concentrations of 60-200 mg L⁻¹, indicating that these compounds display relatively little toxicity. The monoterpene alcohols were also tested for mutagenicity and genotoxicity. Some of …
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Interactions of insecticidal spider peptide neurotoxins with insect voltage- and neurotransmitter-gated ion channels
… unlikely to be the lethal target of ƙ-HXTX-Hv1c. Acute toxicity tests of classical non-phylum selective BKCa blockers such as paxilline, charybdotoxin and iberiotoxin did not induce acute toxicity in insects. Furthermore, while ƙ-HXTX-Hv1c was found to prolong action potential repolarisation, …
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Toxicity of zinc, copper, and sediments to early life stages of freshwater mussels in the Powell River, Virginia
… specifically zinc (Zn) and copper (Cu). Acute toxicity tests with Zn, Cu, and mixtures of these two metals were conducted with glochidia and juvenile freshwater mussels. Effects of varying conditions such as water source, temperature, length of exposure, species, and lifestage were …