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 31 for “"microbial risk"”.
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Application of Quantitative Microbial Risk Assessment to Domestic Hygiene
… manage waste greatly reduces the public health risk of pathogen spread. The domestic restroom, more specifically the modern-day toilet is both a source and a sink for much of our residual wastewaters. With the onset and resurgence of the COVID-19 pandemic, domestic hygiene has recently become …
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Microbial risk assessment for recreational use of the Malden River
… assessing this issue, I performed a recreational risk assessment based on microbial concentration data from water quality sampling performed by the Mystic River Watershed Association (MyRWA) and the Massachusetts Water Resources Authority (MWRA). A significant difference in the bacterial data from …
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Microbial risk assessment for recreational use of the Kallang Basin, Singapore
… value of their scarce water sources. Therefore, microbial risk assessments were conducted on locations along the Kallang Basin to analyze any diurnal or spatial differences in probabilities of illness, and establish guideline geometric mean concentrations. Samples were collected at four different …
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Microbial risk assessment for recreational use of the Kranji Reservoir, Singapore
… at the Kranji Reservoir to determine the microbial water and sediment quality of the reservoir for use in a model that predicts the risk of gastrointestinal illness due to recreational use of the reservoir. Water samples were collected at seven locations throughout the reservoir and …
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Developing sampling simulation and quantitative microbial risk assessment to improve food safety management systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Quantitative Microbial Risk Assessment Model to Estimate Exposure to Campylobacter from Consumption of Chicken in the United States
… in chicken prior to consumption a quantitative microbial risk assessment (QMRA) was conducted for boneless, skinless chicken breast meals prepared and consumed domestically in the contiguous United States. This QMRA model was developed with @RISK software (Palisade Corp., Ithaca, NY) and data …
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Using quantitative microbial risk assessment to determine if health risk warrants boil water advisories in Newfoundland and Labrador : time for a new approach
… Boil Water Advisories (BWAs) as a public health risk management tool is increasingly being questioned. Newfoundland and Labrador's zero-risk policy for issuing BWAs on public drinking water systems has resulted in over 210 active BWAs annually, the majority classified as long-term BWAs. BWAs are …
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Power in numbers: quantitative microbial risk assessments of Salmonella in federally sampled ground meat products and the resulting impact of risk management strategies on public health
… characterization. Pathogen enumeration allows risk assessors to use dose-response relationships to directly link an ingested dose to the likelihood of a consumer experiencing a health outcome (often illness or death).This dissertation explores the use of quantitative Salmonella enumeration of …
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Risk Analysis Based on Performance Criteria: A Food Safety Control System and Decision-making Tool to Control Salmonella from Whole Broilers
Risk analysis is a powerful science-based tool that can be used to control and mitigate microbial food safety hazards. Codex recommends conducting preliminary risk management activities (PRMAs) to initiate risk analysis and to plan the risk assessment process. The information learned from these …
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Impact of strain variability on the risk presented to chilled foods by non-proteolytic clostridium botulinum
… thesis aims to extend the current quantitative microbial risk assessment for minimally heated chilled foods by including information on variability of non-proteolytic Clostridium botulinum at strain level. The research on strain variability covers practical experiments as well as literature …
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Development of a Risk Assessment Model to Assess TMDL Implementation Strategies
… each. Although past research indicates that the risk of illness to humans varies by source of fecal contamination, current watershed assessments are developed according to total concentration of indicator bacteria, with all sources weighed equally. A stochastic model using Quantitative Microbial …
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Meta-Analysis on the Effect of Interventions Used in Cattle Processing Plants to Reduce Escherichia coli Contamination in Beef
A Quantitative Microbial Risk Assessment (QMRA) has been undertaken to utilize research on Shiga-toxin Escherichia coli (STEC) contamination in beef for the benefit of public health. The QMRA operates as a 2nd order Monte Carlo simulation to create stochastic mathematical models that incorporate …
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Desenvolvimento de modelos de avaliação quantitativa de risco microbiológico associados a Toxina estafilocócica e a Listeria monocytogenes em produtos lácteos
… de risco microbiológico (Quantitative Microbial Risk Assessment; QMRA) é a etapa mais complexa da análise de risco, que permite que todos os envolvidos na cadeia produtiva de alimentos, desde órgãos reguladores até a indústria, obtenham informações numéricas concretas a respeito das …
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Dishwashing Water Recycling System and Related Water Quality Standards for Military Use
… and ultrafiltration process. A quantitative microbial risk assessment (QMRA) was also performed based on exposure scenarios derived from literature data. As a result, a specific set of dishwashing water reuse standards for field analysis (simple, but accurate) was finalized as follows: …
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Quantitative sustainable design of water and sanitation infrastructure in resource-rich and resource-limited contexts
… – life cycle assessment (LCA) and quantitative microbial risk assessment (QMRA) – in two different contexts. First in a resource-rich context, critical opportunities for advancing the use of LCA were identified including the integration of spatial considerations (e.g., spatialized …
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Novel Approaches to Exposure Assessment and Dose Response to Contaminants in Drinking Water and Food
… health. Thus, this dissertation focuses on risk assessment and applying novel methods for exposure assessments and dose responses to contaminants in drinking water and foods. Factors that greatly impact contaminant exposures and human dose response include: population susceptibility (i.e., …
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Impact of a Barrier on Transport of Particles and Aerosolization of Viruses at a Wastewater Treatment Plant
… concentrations at the WWTP. A quantitative microbial risk assessment model was constructed to determine inhalation risks associated with airborne SARS-CoV-2 for WWTP operators. The probability of infection ranged from about 2.4 x 10-4 to 5.6 x 10-8 and was heavily dependent on exposure time, …
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Quantifying uncertainty in pathogen removal, membrane integrity monitoring and health consequences in the treatment of drinking water
… removal. In Chapter 4, we applied Quantitative Microbial Risk Analysis (QMRA) to examine the probability of infection by Cryptosporidium given that fibers may break on a daily basis. This later examination uses an uncertainty analysis of the levels of oocysts in source water bin classifications. …
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Growth probability of Escherichia coli O157:H7 and Listeria monocytogenes in packaged fresh-cut romaine mix at fluctuating temperatures during simulated transport, retail storage and display
… sale of leafy greens negatively impacts both microbial safety and product quality. Consequently, the effect of fluctuating temperatures on Escherichia coli O157:H7 and Listeria monocytogenes growth in commercially bagged salad greens was assessed during transport, retail storage, and display. …
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The usefulness of multiple antibiotic resistance (MAR) indexing technique in differentiating fecal coliform bacteria from different sources
… 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 considered when designing treatment regimes for the …
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