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 8 of 8 for “"quaternary ammonium compounds (QACs)"”.
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Biodegradation of QACs in lake and river water and effects on the microbial community
Quaternary ammonium compounds (QACs) are a class of commonly used organic cationic biocides. Disinfectant products contain QACs that are above the minimum inhibitory concentration of most microbes. After usage and wastewater treatment, however, many QACs end up in surface waters at sub-inhibitory …
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Evaluation of a Microalgal Bioassay Based on Community Level Physiological Profiling (CLPP)
… carbon sources for a microalgal bioassay. Quaternary ammonium compounds (QACs) were used as potentially toxic model compounds to demonstrate the applicability of the assay. Toxicity of dodecyl trimethyl ammonium chloride (DTAC) and didecyl dimethyl ammonium bromide (DDAB) on the growth of …
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Elucidating the Molecular Pathways Involved in the Fitness and Water Stress Response of Pseudomonas synxantha 2-79 in the Plant Rhizosphere
… contain plant-derived osmoprotectants called quaternary ammonium compounds (QACs). We tested this hypothesis by identifying waters stress response pathways in the 2-79 genome and then constructing a series of isogenic mutants deficient in one or more biofilm matrix and QAC transporters. The …
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Fate and effect of alkyl benzyl dimethyl ammonium chloride in mixed aerobic and nitrifying cultures
Quaternary ammonium compounds (QACs) are widely used in commercial and consumer applications as disinfectants, fabric softeners, hair conditioners, and emulsifying agents. The massive production and utilization of QACs has led to their extensive discharge into the environment, raising concerns …
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Chemical and biological evaluation of antibiotic-based ionic liquids and GUMBOS against pathogenic bacteria
… ILs consisting of several different quaternary ammonium compounds (QACs) on Escherichia coli O157:H7, Klebsiella pneumoniae, Staphylococcus aureus, and Listeria monocytogenes. The synthesized API-ILs were validated with proton nuclear magnetic resonance spectroscopy (NMR) and …
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Effects of Quaternary Ammonium Disinfectants on Mouse Reproductive Function
Quaternary ammonium compounds (QACs) are antimicrobial disinfectants commonly used in commercial and household settings. While these compounds have been used for decades, reproductive toxicity has not been thoroughly evaluated. Extensive use of QACs results in ubiquitous human exposure to …
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Evaluation of Nitrification Inhibition Using Bench-Scale Rate Measurements, Profile Sampling, and Process Simulation Modeling
… toilet waste received at NTP possibly containing quaternary ammonium compounds (QACs). Due to available blower capacity during construction it was planned that nitrification would not be maintained during the fall of 2009. In an effort to stop nitrification, the solids retention time (SRT) was …
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Elucidation of the Specificity of S. meliloti Chemoreceptors for Host Derived Attractants
… and quantified two classes of attractant compounds exuded by germinating alfalfa seeds, namely, amino acids and quaternary ammonium compounds (QACs). At all points possible, we have compared alfalfa with the closely related non-host, spotted medic (Medicago arabica). The chemotactic …