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 30 for “"bioaerosol"”.
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Bioaerosol Dispersal Across Scales: Regional Patterns, Field Study, and Model Evaluation
Bioaerosols--including seeds, pollen, fungal spores, bacteria, and viruses--are fundamental agents connecting atmospheric processes to agriculture, ecosystem function, and human and animal health. This dissertation uses Lagrangian stochastic (LS) models to simulate how these particles travel and …
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Generation and biological collection efficiency of MS2 bioaerosol for the evaluation of aerosol filtration devices
Exposure to bioaerosol in indoor environments is associated with adverse health effects. There is need to develop control devices to separate bioaerosols from gas streams in heating and ventilation systems to protect human health and enhance national security. The goal of this research is to …
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Characterization and Concentration of Particulate Matters Emitted From Confinement Animal Buildings
Third, seasonal bioaerosol measurements focusing on airborne bacterial particles were performed using a six-stage cascade impactor from nine different animal farms (swine finishing, farrowing, and layer hen housing). The measured bioaerosol concentrations varied from 12,000 to 28,000 CFU/m3 showing …
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Bench-scale evaluation of an energy efficient acoustic aerosol purification device with a newly designed bioaerosol testing and evaluation chamber
The most common method to purify building air of particulate matter is fabric filtration that can cause a large pressure drop, resulting in high-energy use for adequate protection. Facilities requiring advanced protection against particulate matter typically utilize high efficiency particulate air …
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Microbial characterisation of bioaerosols from indoor environments using molecular techniques.
… and despite the recognition of the importance of bioaerosol exposure on human health, relatively little is known about the microbial agents in indoor air and there are still critical gaps in our understanding of the airborne microbial communities. Molecular biology methods demonstrate a great …
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Matrix-assisted laser desorption/ionization mass spectrometry for the analysis of collected bioaerosols
… and identification of microorganisms from bioaerosols using offline matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) for the analysis of proteins. MALDI-MS intact bacteria techniques were adapted for use with an orthogonal MALDI quadrupole-time-of-flight mass …
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Evaluation of bacterial sampling methods for use with the bacterial tag-encoded flexible (FLX) amplicon pyrosequencing (bTEFAP) technique
… or viable sampling and characterization of bioaerosols. Pyrosequencing promises to be a novel, molecular-based technology that is exceptionally sensitive, low-cost, and provides a reasonable turnaround in the identification, distribution and concentration of aerosolized microorganisms. …
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Catching a glimpse: the visualization of Mycobacterium tuberculosis from TB patient bioaerosols
… (DMN-tre), with the arraying of bioaerosol samples on bespoke nanowell devices amenable to fluorescence microscopy. With this method, a median of 14 live Mtb bacilli (range 0-36) were detected in 90% of confirmed TB patients following 60 minutes of bioaerosol sampling. Three …
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Signal variation in single particle aerosol mass spectrometry
… security. One approach to such detection, bioaerosol mass spectrometry (BAMS), is currently under development at Lawrence Livermore National Laboratory. BAMS is a type of single particle aerosol mass spectrometry that rapidly records dual-polarity mass spectra of aerosolized …
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Understanding the chemistry of atmospheric particles using single particle mass spectrometry
… and used to derive vertical profiles of bioaerosol from near-surface to the upper troposphere.
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Development and Characterization of an Inexpensive Single-Particle Fluorescence Spectrometer for Detection and Classification of Pollen and Other Bioaerosols
… has been applied as one method to bridge gaps in bioaerosol detection and classification, though this instrumentation suffers from prohibitively high cost or analysis barriers.</p> <p>This thesis describes the development, characterization, and preliminary application of a new single-particle …
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Determination and control of some pollutants in indoor environments
… Smoking waterpipe was found to generate a bioaerosol rich in microbial components, policyclic aromatic hydrocarbons (PAHs), and small size particles. Rapidly increasing RH was found to influence air concentrations of VOCs emitted from building materials as studied both in a climate chamber …
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Quantification of Airborne Fungal Spores Comparing Molecular Tracers via Ion Chromatography and UV-LIF Methods
… spores represent an understudied subcategory of bioaerosols that can impact human health as pathogenic and allergenic particles. Fungal spores also have been shown to act as effective ice nuclei and giant cloud condensation nuclei in some cases. This has implications on the hydrological cycle on …
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Predicting Package Defects: Quantification of Critical Leak Size
… this study, air-filled defects were examined. A bioaerosol exposure chamber was used to test micro-defects, nickel microtubes of known diameters 2, 5, 7, 10, 20, and 50 μm hydraulic diameters, against pressure differentials of 0, -6.9, -13.8, and -34.5 kPa.
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Emissions of Bioaerosols from Composting Facilities
… major public health concerns is the emissions of bioaerosols from the composting sites. Bioaerosol dispersion across composting facilities, due to operational activities, may have significant effects on human health due to the fact that they can penetrate into the human respiratory system leading …
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Fluorescent Biological Aerosol Particles in Coastal Canada and the Link to Atmospheric Ice Nuclei
<p>Bioaerosols are a subgroup of atmospheric aerosols and are often linked to the spread of human, animal and plant diseases. Bioaerosols also may play an indirect effect on environmental processes, including the formation of precipitation and alteration of the global climate through their role as …
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