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.
Results
Showing 1 to 20 of 20 for “"Indicator Organisms"”.
-
Monitoring Peatland Damage and Restoration Using Testate Amoebae as Indicator Organisms
… for using testate amoebae as biological indicators of peatland damage and restoration. These aims were achieved through studies at three sites covering a range of damage commonly affecting UK sites. The experiments entailed repeated monitoring of a ditch blocking experiment at Coom Rigg …
-
Factors Associated with Foodborne Pathogens and Fecal Indicator Organisms in Virginia Agricultural Soils
… enterica and L. monocytogenes prevalence, fecal indicator bacteria concentration). Three produce farms in Virginia were selected from different regions (i.e., Blue Ridge Highlands, Piedmont, Coastal Plains). Farms were sampled four times to capture seasonal differences. Five soil samples were …
-
Assessment of trace metals pollution along the Central Namibian marine coastline: using Choromytilus Meridionalis (Black Mussel) as indicator organisms.
… pollution using Choromytilus meridionalis as indicator organism. Samples were collected using randomized sampling techniques during winter and summer months of 2012. EPA 3050B and ICP-OES protocols were used to digest and assimilate the samples. Data were analysed using a 4x2x3 factorial model …
-
Evaluation of survival and recovery characteristics of bifidobacteria as indicators of fecal pollution of water
… of aquatic environments for bacterial indicator organisms has proven to be a useful and well-established practice for the purpose of monitoring microbiological water quality. An ideal indicator of fecal pollution should be present in sufficient density to allow detection, present …
-
Application of Multivariate Statistical Methodology to Model Factors Influencing Fate and Transport of Fecal Pollution in Surface Waters
… is a growing public health concern. While indicator organisms are frequently used as a surrogate measure of pathogen contamination, poor correlation is often observed between indicators and pathogens. Because of adverse health effects associated with poor water quality, an assessment of the …
-
Comparing the distribution of pathogenic bacteria and common indicator microorganisms in biofilms on different surface types in an agricultural watershed in British Columbia (Canada)
… is known about the distribution of bacterial indicators and pathogens in biofilms on different surface types in natural aquatic environments. This study was conducted to examine the distribution of pathogens and indicator bacteria in biofilms in an agricultural watershed. The study …
-
Bacterial Source Tracking in the Sinking Creek Watershed Using Antibiotic Resistance Analysis and Ribotyping.
… is a significant environmental health issue. Indicator organisms are used to monitor microbial water quality, but often their presence does not coincide with the presence of pathogens. Bacterial source tracking is a term describing methods to determine the origin of fecal pollution based on …
-
The development of a strategic approach to managing diffuse pollution
… included suspended solids, nutrients, faecal indicator organisms, toxic metals and organic pollutants. Key characterisation aspects included the investigation of how concentration (not just load) varies with flow in diffuse pollution impacted watercourses. It was repeatedly found that higher …
-
Shedding Light on Decay Kinetics of Critical Wastewater Bacteria with Molecular Tools
… concern are decay characteristics of fecal indicator organisms, which can aid design of wastewater treatment processes to eliminate fecal pathogens. This study focuses on characterizing the decay of three strains of the key fecal indicator bacterium, Escherichia coli, and comparing microbial …
-
Bovine faecal contamination in an Irish agricultural catchment: sources and pathways
… direct farmyard effluent to attenuate faecal indicator organisms (thermotolerant coliforms) within the water column and within benthic sediments, over their length; and to determine the distribution, concentration, and origin of thermotolerant coliforms (TTC’s) at intensive spatial scales …
-
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 …
-
Some ecological factors affecting the input and population level of total and faecal coliforms and salmonella in Twelve Mile Creek, Lake Ontario and sewage waters near St. Catharines, Ontario
… and high levels of total and faecal coliform indicator organisms, the sanitary quality of Lake Ontario and Twelve Mile Creek at the sample sites seemed to be impaired over the major portion of the study period.
-
On-site wastewater treatment and disposal systems on reclaimed mined land
… through the soil columns. The concentration of indicator organisms indicated a gradual decline in viable bacterial cells and viral particles over time, with the indicator virus assays being completely negative by day 11. The tracer organism study also indicates that the survival time of these …
-
Potential groundwater contamination from pit latrines in Ga-Maja and Reefentse
… study used the Colilert™ technique to determine indicator organisms, and the agar diffusion method to determine antibiotic resistance in isolated pathogenic bacteria. Isolates were assayed against ten antibiotics using the Kirby Bauer disc diffusion technique. Identifying the sensitivity and …
-
Quantifying Potential Sources of Microbial Contamination in Household Drinking Water Samples
In Virginia, over one million households rely on private water supplies (e.g. well, spring, cistern). Previous literature acknowledges bacterial contamination in private water supplies as a significant public health concern in the United States. The present study tested private wells and springs in …
-
Vegetation-Based Metrics Of Biotic Integrity For Assessing The Ecological Condition Of Wetlands Of Kentucky
… the ecological condition of a site based on indicator organisms that reflect current and past anthropogenic disturbances of the area. In this study I report on initial efforts to develop a vegetation-based IBI for Kentucky (KY VIBI). Ohio has a state-wide applicable vegetation-based IBI …
-
Metagenomic Analysis of Spring and Stream Waters in the Chesapeake and Ohio Canal National Historical Park
… identification of representative sets of indicator organisms, which requires extensive stream sampling and laboratory observation in the laboratory and taxonomic identification. These operations are time- and personnel-consuming and require a great deal of experience. In this project, we …
-
Microbial Source Tracking in a Mixed Use Watershed in Northern Virginia
… under a certain standard for levels of fecal indicator bacteria (FIB). The sources of fecal pollution in neighboring watersheds within the county were determined over the 12 months previous to this project by performing Antibiotic Resistance Analysis (ARA, a microbial source tracking protocol) …
-
Assessment of health risk association with groundwater from Collins Chabane and Makhado Municipality of Vhembe District
… method was employed to determine faecal indicator organisms. The results obtained for E. coli ranged between 0.0 – 76 cfu/100 ml in the dry season, while numerous values were detected for total coliform in both dry and wet season. All borehole failed to comply with SANS 241 and WHO …
-
Efficacy of the Microtally® Mitt for sampling of beef carcasses
… samples collected in Study 2 were analyzed for indicator bacteria counts, using appropriate Petrifilm plates, to enumerate aerobic plate counts (APC), Enterobacteriaceae counts (EBC), total coliform counts (TCC), and E. coli counts (ECC). The remaining half of the Study 2 samples were analyzed …