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 58 for “"indicator bacteria"”.
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Densities of indicator bacteria in urban and rural runoff
This study was designed to investigate the indicator bacterial densities in runoff from urban and rural sources and to compare these densities with the densities in both raw and secondary-treated, unchlorinated sewage effluents. Analysis was performed on a total of 42 samples, 22 of which were …
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Modeling Fecal Indicator Bacteria and Antibiotic Resistance in Diverse Aquatic Environments
… States. Understanding the sources of fecal indicator bacteria (FIB) and the environmental processes that affect them can be crucial to reducing the number of impaired streams and limiting the negative impacts on the environment. Antibiotic resistance is an emerging issue facing human health …
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Unveiling Origins and Dynamics of Fecal Indicator Bacteria in an Urban Creek
Urban waterways are highly vulnerable to bacterial contamination, which presents significant risks to public health and water quality. Common methodologies typically measure the total concentration of fecal indicator bacteria (FIB) but are unable to address the complex sources of contamination …
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Associations between Fecal Indicator Bacteria Prevalence and Demographic Data in Private Water Supplies in Virginia
… associations between concentrations of fecal indicator bacteria (e.g. coliforms, E. coli) in 831 samples collected at the point-of-use in homes with private water supply systems and homeowner-provided demographic data (e.g. homeowner age, household income, education, water quality perception). …
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Novel Time-Integrated Quantification of Sediment-Associated Fecal Indicator Bacteria in Rural Alabama Creek with Straight Pipes
… technology for capturing and monitoring fecal indicator organisms and the suspended sediment load. Made of PVC, the TIMS devices are low-cost, easy-to-use, and more effective than grab sampling, especially during periods of high precipitation. While these devices have been utilized for sediment …
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Fecal Matters: Fate and transport of traditional fecal indicator bacteria and source-tracking targets in septic drainfields
… used to identify whether the presence of fecal indicator bacteria (FIB) is associated with human or non-human sources in order to inform remediation strategies. However, the application of ST to groundwater has been limited, and the interpretation of data is consequently difficult. This research …
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Sands and environmental conditions impact the abundance and persistence of the fecal indicator bacteria Enterococcus at recreational beaches
The marine fecal indicator Enterococcus is measured at beaches to detect fecal contamination events, and beaches are closed to bathers when Enterococcus is found to exceed the federally mandated limit. This dissertation presents evidence that beach sands are an environmental reservoir of …
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Antimicrobial use practices and resistance in indicator bacteria in communal cattle in the Mnisi community Mpumalanga South Africa
… study was to determine the resistance of the indicator bacteria, Escherichia coli and Enterococcus species, isolated from communal cattle, and to determine the knowledge on and use practices of antimicrobial drugs by farmers in the Mnisi community Ward B1 in Mpumalanga province of South …
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Sands and environmental conditions impact the abundance and persistence of the fecal indicator bacteria Enterococcus at recreational beaches
The marine fecal indicator Enterococcus is measured at beaches to detect fecal contamination events, and beaches are closed to bathers when Enterococcus is found to exceed the federally mandated limit. This dissertation presents evidence that beach sands are an environmental reservoir of …
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A poultry litter marker gene correlates with pathogen and indicator bacteria deposition on, growth in and transport from poultry bedding
… between the poultry litter marker gene and indicator bacteria (FIB) and pathogens during deposition. Culture and qPCR analysis revealed growth of Enterococcus, Staphylococcus and Bacteroidales in the litter for up to four weeks after deposition in feces. In contrast after deposition of E. …
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A Comparative Study of Three Bacterial Source Tracking Methods and the Fate of Fecal Indicator Bacteria in Marine Waters and Sediments
… used to determine the fate and survival of fecal indicator bacteria (FIB) in sand and sediments. The microbial source tracking (MST) methods antibiotic resistance analysis (ARA), Bacteroides human-specific primer test, and fluorometry were compared against the FIBs to determine how reliable each …
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Analysis of the efficacy of a constructed wetland in treating human fecal contamination
… conventional culture-based methods to enumerate indicator bacteria and quantitative polymerase chain reaction (qPCR) method to quantify the human host-specific Bacteroides 16S rRNA genetic marker. Constructed wetlands behave as sinks and transform pollutants to improve the quality of surface …
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Bacteria Prediction For Recreational Waters Through The Use Of Artificial Neural Networks
… scientists and government agencies rely on Fecal Indicator Bacteria (FIB) to determine the risk of exposure to pathogens in water. If there is a presence of these indicator bacteria, pathogenic microorganisms may also be present. These bacteria in recreational water bodies pose a health threat to …
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Evaluation of agricultural beneficial management practices: Cattle access restriction to surface waters subsurface tile drainage management
… study compared water quality endpoints such as: indicator bacteria, pathogens, parasites and nutrients between treatments. Microbial source tracking indicated that livestock was the main source of fecal contamination in the stream. Greater bacteria and nutrient loads were observed in the …
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Microbial risk assessment for recreational use of the Kallang Basin, Singapore
… exceeded the tolerable illness level for indicator bacteria at certain times, with peak concentrations at 7:00 A.M. and 11:00 A.M. However, for adenovirus, the probabilities of illness did not exceed the tolerable level based on appropriate dragon-boat racer ingestion rates. Statistical …
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Development of a Risk Assessment Model to Assess TMDL Implementation Strategies
High levels of fecal indicator bacteria (e.g. E. coli) are the leading cause of identified surface water impairments in the United States. The US Clean Water Act of 1972 requires that jurisdictions establish priority rankings for impaired waterways and develop a Total Maximum Daily Load (TMDL) plan …
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Evaluating human fecal contamination sources in Kranji Reservoir Catchment, Singapore
… Kranji Reservoir catchment contain human fecal indicator bacteria above recreational water quality criteria; their sources and distribution under dry and wet weather are also unknown. The goal of this study was to evaluate the distribution of E. coli under dry and wet weather, to determine the …
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Three Quaternary Catchments in Vhembe District Municipality: A GIS Approach
… assess the abundance and distribution of faecal indicator bacteria (FIB) in surface and groundwater sources across wet and dry seasons and to examine the impact of land use on FIB levels. Using GIS, we analyzed FIB concentrations in rivers and boreholes. The study found higher FIB levels during …
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A Comparative Microbial Composition Assessment of Stormwater, Urban Runoff and Wastewater
… to compare two methods for assessment of fecal indicator bacteria (FIB) in urban runoff (n = 96), stormwater (n = 8), and wastewater (n = 16). We quantified the densities and reductions of E. coli and Enterococcus, in raw stormwater, treated urban off from the Santa Monica Urban Runoff Recycling …
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