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 14 of 14 for “"Bacterial concentration"”.
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Transport of copiotrophic bacteria in oligotrophic coarse soils: a Monte Carlo analysis
… thought to be oligotrophic. A stochastic bacterial transport model was developed to analyze bacterial translocation in coarse-grained, mountainous soils beneath a hypothetical drainfield/soil interface. Specific model parameters were randomly generated using a procedure known to produce …
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Population Dynamics of Ice Nucleation Active Bacteria on Prunus Persica Cultivars
… 7.0) containing 0.1% peptone was necessary for bacterial survival during the leaf washing process. Ice nucleation at -5 C was best detected from colonies grown on nutrient agar supplemented with 2.5% glycarol. Seasonal variations in populations of total and INA bacterial were observed over a ten …
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An Alternative Method to Concentrate E. coli O157:H7 from Meat Homogenates to Facilitate Detection by Cultural and Molecular Methods
… to detect this organism are crucial. Current bacterial concentration methods from foods, such as centrifugation and filtration, are problematic, often co-precipitating or becoming clogged with food particulates. Metal hydroxide concentration of bacterial cells has gained increased recognition …
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Utilization of ferrioxamine microarrays for the rapid detection of pathogenic bacteria
… ligand for pathogen detection. A number of bacterial strains expressing high-affinity FOx receptors were identified by a proteomic BLAST search, and screened against microarrays patterned with FOx conjugates for detection using label-free optical imaging. Aspects such as inkjet printing and …
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Using blue light for bacterial inactivation
… To investigate the impact of the following on bacterial inactivation using a custom-built LED light module: i) exposure time; ii) sample distance; iii) bacterial concentration; iv) sample position on plate; v) incorporation of UV-resistance plasmids and also to conduct comparisons in …
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Partitioning Between Soil-Adsorbed and Planktonic Escherichia coli
… as the difference between total and planktonic bacterial concentration. Planktonic concentration was defined as the concentration of bacteria that could pass through an 8 μm screen. Total concentration was determined by disaggregating attached bacteria through a dispersion treatment. A …
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Functional and ecological investigations in Cucurbita: factors mediating fruit infections and insect interactions
Bacterial spot disease of cucurbits, caused by Xanthomonas cucurbitae, poses a significant threat to pumpkin production. This study aimed to investigate the role of the exocellulase gene cbhA in disease development by comparing a wildtype IL 234 4R isolate to a ΔcbhA mutant in greenhouse fruit …
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Application of the SWAT Model to Bacterial Loading rates in Kranji Catchment, Singapore
… Kranji Catchment in January 2011. Currently, bacterial levels in Kranji Reservoir are measured by sampling, which is labor intensive and delayed. As an alternative, a model of the surrounding watershed was constructed to estimate bacterial loading to the reservoir as driven by changing weather …
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Multi-Scale Probing of Colloidal Sedimentation Dynamics in Active Suspensions
… of swimming Escherichia coli across various concentrations within the dilute regime. The sedimentation processes receive comprehensive characterization across length scales, through the examination of macro-scale settling speeds, meso-scale concentration profiles, and micro-scale particle …
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Manometric determination of the biochemical oxygen demand of sulfite paper mill wastes
… the change in the oxygen uptake of high concentrations of microorganisms because of the presence of the waste. These determinations involved a modification of the resting cell technic used in conjunction with direct Warburg technics. High concentrations of washed cells were prepared and …
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Biosorption of uranium and its effect on uranium transport in groundewater
… improved to include variations in geochemical concentrations, reductive microbial processes, and adsorption of uranium to minerals, they do not incorporate the presence of microorganisms as sorption sites that may influence the overall transport of uranium. The main objective of this research …
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Three-dimensional kinetic simulations of active suspensions: effect of chemotaxis and steric interaction
… by making temporal comparisons of the oxygen concentration, and, on average, swim towards high concentrations of oxygen. The kinetic model proposed by Saintillan and Shelley [1, 2] is modified to include run-and-tumble effects and oxygentaxis. The spatio-temporal dynamics of the oxygen and …
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Investigating contamination of dental-unit waterline systems and microbial biofilm ecology
… were harboring nosocomial bacteria. Results: The bacterial concentration of the water samples cultured on R2A agar varied significantly (1 × 101 to 4.3 × 106); in surgeries (48%) which met DoH standards and those that failed (52%). A retest of water from surgeries which delivered safe and …
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Novel approaches to the low-cost, portable and rapid detection of bacterial pathogens in foods and food-processing environments
… settings.</p> <p>While the use of non-specific bacterial enzymes may limit some applications, immobilization of bacteria-specific bacteriophage (P22, T4) onto paper can provide an additional layer of specificity. Bacteriophage are robust, and may be easily absorbed onto paper. In this work, …