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 51 for “"fecal contamination"”.
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Evaluating human fecal contamination sources in Kranji Reservoir Catchment, Singapore
… the 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 …
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Determining Sources of Fecal Contamination in Two Rivers of Northumberland County, Virginia
… shellfish beds that are closed to harvest due to contamination with fecal bacteria. These two rivers are located in Northumberland County, Virginia, and empty into the lower Potomac River and the Chesapeake Bay. Bacterial source tracking (antibiotic resistance analysis of Eschericia coli) was used …
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Analysis of the efficacy of a constructed wetland in treating human fecal contamination
… non-point source pollution, particularly, human fecal contamination, was evaluated by collecting and analyzing water samples using both conventional culture-based methods to enumerate indicator bacteria and quantitative polymerase chain reaction (qPCR) method to quantify the human host-specific …
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An investigation of leaky sewers as a source of fecal contamination in the stormwater drainage system in Singapore
… was conducted into possible pathways for fecal contamination to enter stormwater drains from leaky underground sewer lines in Singapore. The island's drainage channels flow into catchment reservoirs that are used to store water for future supply needs. Singapore's Public Utilities Board …
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Elucidating fecal contamination exposure in low-income countries, the contribution from child feces disposal practices and soil ingestion, and links to child health
Enteric pathogens transmitted via fecal-oral pathways cause enteric infections that have substantial health and human capital consequences, making it critical to reduce child exposure to fecal contamination. Current water, sanitation, and hygiene programs in low-income countries often focus on …
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Bacterial Source Tracking of E. coli in a Constructed Wetland
… source tracking was used to identify sources of fecal contamination in a constructed wetland. Nucleotide sequence differences in the <em>Escherichia coli </em>malate dehydrogenase (<em>mdh</em>) gene were used to distinguish between strains isolated from pigeon and cattle feces. Fourteen <em>E. …
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Host Specific Microbial Source Tracking and Quantification Using the Partial 16SrRNA Gene Sequence of Bacteroides on the Wilson's Creek Tributary in Southwest Missouri
<p>Fecal contamination is a major issue that county health departments address to protect the many individuals that enjoy recreational streams. Pathogens that accompany fecal contamination can cause severe human health problems. Many different point and non-point sources of fecal contamination …
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Identification of fecal pollution sources of karst waters by a combination of Bacteroidales genetic marker, bacterial indicators, and environmental variables
Fecal contamination in Midwestern karst regions was evaluated by a combination of Bacteroidales-based microbial source tracking (MST), traditional bacterial indicators, and environmental variables. Water samples from springs and wells were collected from Illinois, Wisconsin, Kentucky and Missouri …
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A multi-disciplinary approach to tracking the downstream impacts of inadequate sanitation in Central Appalachia
… in rural areas can often lead to high levels of fecal contamination in local waterbodies and subsequent exposure to waterborne disease can occur. Although standard water quality measures such as quantification of E. coli can reveal relative concentrations of fecal contamination, they do not …
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Enteric adenovirus and coliphage as microbial indicators in Singapore's Kallang Basin
E. coli, Enterococci, and other fecal indicator bacteria have been the gold standard for assessing and regulating water quality. However, the presence of these water quality indicators often do not reflect the presence of viral pathogens, such as human enteric viruses, posing significant health …
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The usefulness of multiple antibiotic resistance (MAR) indexing technique in differentiating fecal coliform bacteria from different sources
Pollution of water sources with human fecal matter and associated intestinal pathogens poses a great risk to public health. Fecal contamination of water is not the only problem to communities that consume untreated water. The extent of the microbial contamination of water sources also needs to be …
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Fecal Coliform as an Indicator of Water Quality and Recreational Carrying Capacity At Ozark National Scenic Riverways
… relationship between levels of canoe use and fecal coliform densities. Water quality data were collected at seven locations on the Current and Jacks Fork Rivers during the summer of 1985. Water quality tests performed were dissolved oxygen, conductivity, nitrates, pH, temperature, fecal …
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Prevalence of Salmonella and E. coli on Produce from Seattle Farmers Markets
This study surveyed the extent of microbial contamination on lettuce and tomatoes purchased from farmers markets, an increasingly popular source of local produce. Foodborne outbreaks in the U.S. have implicated <italic>Salmonella</italic> and <italic>E. coli</italic> as etiologic agents associated …
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Development and evaluation of a colorimetric coliphage assay detection system
… than the APHA method under conditions of high fecal pollution, but both methods performed equally well in coliphage detection under conditions of low fecal contamination, and 5) the LCPA and CAB methods were equally as sensitive in coliphage detection as the APHA method. Finally, the coliphage …
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Resin-based method for concentration of enteric viruses and F-RNA coliphages from water samples
Fecal contamination of source and recreational waters represents a public health concern due to potential content of human pathogens, and the variety of sources from which an individual may be exposed to such contamination. Enteric viruses such as noroviruses, rotaviruses, adenoviruses and …
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Study of four new, field-based, microbiological tests : verification of the hydrogen sulfide (H₂S), Easygel®, Colilert and Petrifilm(tm) tests
… of the H2S producing bacteria as an indicator of fecal contamination; (3) to provide recommendations for the use of a single P/A test and a single enumerative test (PetrifilmTM or Easygel®, ) to be used on the field; and (4) to provide recommendations for a testing combination made up of one P/A …
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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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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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Novel Time-Integrated Quantification of Sediment-Associated Fecal Indicator Bacteria in Rural Alabama Creek with Straight Pipes
… through "straight pipes." The degree to which fecal microbes are associated with the suspended sediment load has important implications for contamination transport. Current state guidelines require periodic grab sampling to monitor surface water fecal contamination. While technically simple, …
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Development of a 16S rRNA gene sequence as a biomarker specific to the gastrointestinal tract and feces of swine based on suppressive subtractive hybridization
Fecal contamination of water bodies causes environmental issues and human health risks. Swine are a major contributor of fecal inputs to environmental waters due to their importance in American agriculture. Water quality currently is regulated using fecal coliforms, which have natural reservoirs in …
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