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 13 of 13 for “"Aquatic toxicity."”.
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Aquatic toxicity of one dimensional carbon nanomaterials
This study determined the toxicity of one dimensional carbon nanomaterials (CNMs) to amphipods, midge, oligochaetes and juvenile mussels in water and sediment. As-produced or modified carbon nanotubes (CNTs) and silicon carbide nanowires (SiCNW) were selected to represent CNMs. Sediment tests were …
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Assessing interactions between nutrients and aquatic toxicity : influences of nitrogen and phosphorus on ionic silver toxicity to the aquatic macrophyte Lemna gibba.
Though nutrients and silver often co-occur in aquatic ecosystems, the combined effects of these environmental stressors on aquatic plants are poorly understood. Such coexposures are important because nanosilver is increasingly released to the environment, and recent studies indicate that the …
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Prymnesium parvum effects on green algae, cladocerans and fish in field and laboratory studies.
… treatment of N:P = 20 in the field decreased aquatic toxicity of P. parvum to cladocerans and fish. Whereas a potential relationship was observed between lower P. parvum related toxicity to fish, lower bacteria densities and fewer observations of P. parvum swarming behavior in laboratory …
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An Evaluation of Coating Material Dependent Toxicity of Silver Nanoparticles
… types of coating materials may exhibit different toxicity effects. The study evaluated coating material dependent toxicity by selecting 3 types of AgNP synthesis methods with different coating materials (citrate, polyvinyl pyrrolidone, and branched polyethyleneimine, coated AgNPs as citrate-AgNPs, …
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Evaluation of Novel Carbamate Insecticides for Neurotoxicity to Non-Target Species
… control agents were selected for further neurotoxicity testing in non-target organisms. For commercial carbamate insecticides, the IC50 varied from 9.1 nM to 2,094 nM. For the novel carbamate insecticides, it varied from 58 nM to 388,800 nM. Based on IC50 data from previous work on A. gambiae, …
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Detection and characterization of nanoparticles in the surface water: challenges and findings
… is essential for accurate assessment of their aquatic toxicity. It is estimated that there are more than 1800 consumers products found in the environment, containing Nanoparticles. Due to their ultrafine invisible nature, it is very difficult and highly technical to detect them in the aquatic …
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In Silico Classification of Industrial Chemicals Associated with Acute Aquatic Toxic Action Utilising Molecular Initiating Events
… as an important part of understanding toxicity to aquatic organisms. However, current MOA classification approaches for acute aquatic toxicity endpoints are limited by their chemical and mechanistic domains. This thesis developed an in silico classification scheme for aquatic toxicology …
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Evaluating Chemical Toxicity: A Novel Behavioral Assay Using Daphnia
… and this complicates their evaluation of their toxicity. There is a need for high-throughput assays to rapidly assess the toxicity of these emerging contaminants. A behavioral assay utilizing freely swimming Daphnia pulex was developed to evaluate the sub-lethal chemical effects. Daphnia, a …
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Hydrologic-Based Ecological Risk Assessment of Urban, Agriculture, and Coal Mining Impacts Upon Aquatic Habitat, Toxicity, and Biodiversity
… and coal mining land use/cover impacts upon aquatic habitat, toxicity and biodiversity were investigated in Leading Creek, a 388 km2 watershed in southeastern Ohio. Abandoned strip mine land (ASML) and active deep underground mines were examined along with abandoned near-surface underground …
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Development of an analytical method to derive hydrophobicity parameters for use as descriptors for the prediction of the environmental and human health risk of chemicals
… to animal testing for the determination of toxicity due to ethical and legislative reasons. One approach to replacing the use of animals is the application of computational methods. These include Quantitative Structure-Activity Relationships ((Q)SARs), which are the formalisation of the …
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Evaluation of Colloidal Stability and Ecotoxicity of Metal-based Nanoparticles in the Aquatic and Terrestrial Systems
… bioassay is applicable as a rapid nanotoxicity screening tool; (ii) how variable water chemistry (dissolved organic carbon (DOC), pH, and hardness) and organic compounds (cysteine, humic acid, and trolox) modulate colloidal stability, ion release, and aquatic toxicity of silver …
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Comparative Life Cycle Assessment of CFC-replacement Compounds in Different Technical Applications
… (SOD), “Climate change” (CC), “Fresh water aquatic toxicity” (FAETP), and “Terrestrial ecotoxicity” (TETP). E125, E7000, E7100, and E7200 are the refrigerants with the lowest impacts in the categories “Acidification” (AP), “Eutrophication” (EP), “Photo-oxidant formation” (POCP), and “Human …
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Effects of environmental factors on wood decay micromorphology of Pinus radiata and Fagus sylvatica, and its significance for in-ground wood preservative performance
… significant for wood in service situations where aquatic toxicity of copper is important. 4. Beech was more susceptible than pine to loss of copper for both CCA and CuAz. This may have been attributable to less efficient fixation reactions and preservative distribution (macro- and micro-) in …