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 122 for “"sub-lethal."”.
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Escherichia coli and Rhizobium leguminosarum response mechanisms to sub-lethal 2,4-dichlorophenoxyacetic acid
… To determine the global effects of 2,4-D at sub-lethal levels on Rhizobium leguminosarum bv. viciae 3841 (Rlv) and Escherichia coli BL21, I used a novel combination of methods involving advanced microscopy and metabolomics. Rlv showed an oxidative stress response, but showed adaptive …
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Acute Toxicity and Sub-Lethal Effects of Non-Point Source Pollutants on Invertebrates
… dissertation examines the acute toxicity and sub-lethal effects of diuron, CuPT, B(a)P, and styrene in the mud snail, Ilyanassa obsoleta, the American oyster, Crassostrea virginica, the sea urchin, Lytechinus variegatus, and/or the barnacle, Amphibalanus (= Balanus) amphitrite. In addition, …
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Sub-Lethal Effects of Hypoxia/Hypercapnia on Callinectes Sapidus in the York River Estuary, Virginia
This research examined effects of hypoxic environments on blue crabs, Callinectes sapidus in an estuarine environment. Hypoxic conditions were treated as a multiple stressor involving low dissolved oxygen (D.O.), increased carbon dioxide (hypercapnia), and low pH concurrently. The objectives were …
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Sub-lethal and lethal effects of a neonicotinoid pesticide on the development of Northern leopard frog tadpoles.
… a static-renewal experiment to monitor the lethal and sub-lethal, developmental effects in Northern leopard frog tadpoles exposed to three concentration levels (250 ng/L, 8.5 mg/L, and 85 mg/L) of imidacloprid in a laboratory setting. Survivorship was 0% by day 23 of exposure to imidacloprid …
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Differential Lipidomic and Proteomic Responses Induced by Sub-lethal Drug Challenge in Susceptible and Drug Resistant Mycobacterium smegmatis
… to rifampicin in particular is concerning. Sub-lethal drug exposure and the development of adaptive phenotypic drug resistance, represent an important avenue by which genetic resistance and treatment failure or relapse may occur. Proteins and general metabolites are molecular classes that …
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Application of attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy to measure sub-lethal effects of potential mutagens
… relatively non-destructive, and so samples can subsequently be analyzed by more conventional approaches. Analyses can be carried out ex vivo or in situ in living tissue, where a reference range of a designated normal state can be derived, and anything lying outside this range is potentially …
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Spread of Red Imported Fire Ant, Solenopsis invicta, in Virginia and effects of sub-lethal exposure to agrochemicals on its behavior
Solenopsis invicta is an invasive ant that has caused detrimental impacts to ecosystems and economies in the Southeastern United States, recently including Virginia. In this study, we explored the invasion ecology of S. invicta through two main objectives. First, we established a comprehensive …
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DELAYED EFFECTS OF SUB-LETHAL LAMPRICIDE, 3-TRIFLUOROMETHYL-4-NITROPHENOL (TFM), EXPOSURE ON THE METABOLIC PHYSIOLOGY OF JUVENILE LAKE STURGEON (<em>ACIPENSER FULVESCENS</em>)
… 3-trifluoromethyl-4-nitrophenol (TFM) can be lethal to juvenile lake sturgeon (<em>Acipenser fulvescens)</em> at high concentrations used to control invasive sea lamprey (<em>Petromyzon marinus)</em>. Little is known about how TFM would affect juvenile lake sturgeon (age-0) at the sub-lethal …
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Molecular and biological characterization of novel isolates of Plutella xylostella granulovirus found in Kenya
… variation of five Kenyan, three Asian and two sublethal isolates of Plutella xylostella granulovirus (PlxyGV) were determined and compared in P. xylostella larvae reared on artificial diet. Optimal production of PlxyGV occlusion bodies (occluded virus, OB) was observed in larvae reared in …
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Toxicology of Three Plant Neurotoxins in Drosophila Melanogaster, Gallus Gallus Domesticus, and Mus Musculus
… were examined after oral administration of a sub-lethal dose of coniine. Coniine was quickly eliminated.
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Remote, non-invasive ischaemic preconditioning of skeletal muscle flaps against ischaemic necrosis : efficacy and mechanism
… prolonged periods of ischaemia, by first subjecting a remote muscle to brief, non-invasive and sub-lethal, cycles of ischaemia and reperfusion, using a hindlimb tourniquet.
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Use of non-lethal endpoints to establish water quality requirements and optima of the Topeka Shiner (notropis topeka)
… water quality assessments are primarily based on lethal level experiments (e.g. LC50 tests), which are poorly suited for assessing optimal water quality conditions or sub-lethal effects of common stressors. Measurements below threshold values may still impede organismal growth and development, …
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Computational and Experimental Investigation of the Critical Behavior Observed in Cell Signaling Related to Electrically Perturbed Lipid Systems
… This leaves a zone of complete cell death and a sub-lethal zone where a fraction of the cells survive. There is substantial evidence of an anti-tumor systemic immune profile in animal patients treated with PEFs. However, the mechanism behind such immune profile alterations remains unknown, and …
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The effect of heavy metals on differentiated neuronal and glial cells
… of this study were to determine the effects of sub-lethal concentrations of numerous heavy metals on neuronal and glial cell differentiation. Using established cellular models, the toxicity of zinc, lead, mercury, methylmercury and thimerosal were investigated using assays of cell viability and …
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The phenotypic and molecular responses of Listeria monocytogenes to stressors
… Such responses typically cross protect against subsequent stresses, including effectors of the human immune system. The aim of this study was to assess the ability of L. monocytogenes to adaptively respond to stressors, and to assess the phenotypic and molecular responses that such exposures …
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Investigating the role of epigenetics in rapid adaptation to stress in Arabidopsis thaliana and Sorghum bicolor
… Arabidopsis thaliana for four generations of sub-lethal doses of glyphosate, trifloxysulfuron, clipping, and shading, which we further classified into the broader categories of stress ecological (shading and clipping) and herbicides (glyphosate and trifloxysulfuron). We analyzed phenotypic and …
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Dynamics of E. coli genome and cytosol under antibiotics
… novel data treatment procedure and discover that sub-lethal doses of ciprofloxacin, rifampicin, and vancomycin as well as hyperosmotic shock conditions cause small but consistent changes (unique to each treatment agent) to the physical organisation of chromosomal Ori2 and Ter3 loci and the …
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Isolation of low ethanol producing yeast strains using adaptive evolution
… relative to the strains they were derived from. Sub-lethal concentrations of sulfite, which sequesters acetaldehyde, thereby limiting ethanol production, was used as a selection pressure. However, removal of acetaldehyde not only limits ethanol production, it also compromises redox balance by …
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