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 239 for “"microorganism"”.
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A combined microfluidic/dielectrophoretic microorganism concentrator
… development of a high-throughput microfluidic microorganism concentrator for pathogen detection applications. Interdigitated electrodes lining the bottom of the channel use positive dielectrophoretic forces to trap particles. A passive mixer is used to circulate the liquid in the channel, …
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Physical and Stochastic Aspects of Microorganism Behaviour
… studies physical and stochastic aspects of microorganisms. From the point of view of $\textit{physics}$, the studies in this thesis are motivated by the goal of gaining biological insight using the machinery of physics and mathematics. From the point of view of $\textit{biology}$, the …
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Selective microorganism concentration using a dielectrophoresis-based microfabricated device
Detection of pathogenic microorganisms is a significant challenge in medicine, environmental protection and biological threat safety because samples are often contaminated. This work presents a method of separating bacterial spores from typical air contaminants such as sand or soot by means of …
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Environmental risk assessment of a genetically-engineered microorganism, Erwinia carotovora
Environmental use of genetically-engineered microorganisms (GEMs) has raised concerns over potential ecological impact. Development of microcosm systems useful in preliminary testing for risk assessment will provide useful information for predicting potential structural, functional, and genetic …
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Experimental Study of Pathogenic Microorganism Resuspension from Mobile Bed Sediment in Irrigational Canals
… known to be potential reservoirs of pathogenic microorganisms. Pathogens’ concentration in the water is associated with sediment through two key processes: resuspension and attachment. This dissertation reports two experimental and one field studies to quantify the role of sediment in microbial …
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Tick abundance and microorganism diversity in the 11 counties comprising the Choctaw Nation of Oklahoma
… records for this region. Detection rates for microorganisms were generally low across all samples when compared to historical reports in human cases from the region. Rickettsia amblyommatis (6.2%) was the most frequently detected microorganism in Amblyomma americanum, while ‘Candidatus …
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The effect of varying food-to-microorganism ratios on phosphate uptake in an activated sludge environment
… study to clarify the importance of the food-to-microorganism ratio (F/M) and to evaluate the nature of phosphate uptake in the activated sludge environment. The investigation consisted of two batch studies which allowed the F/M to vary as follows: 0.20, 0.75, 1.25 and 2.00. The phosphate …
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Efficient Use of Photons in a Photobioreactor
<p>Photosynthetic microorganisms have been used to produce various products and by products ranging from waste water treatment, carbon dioxide fixation, pharmaceuticals, food additives, biofuels etc with varying degrees of success. One of the main impediments for large scale production of these …
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Mobilome and antibiotic resistance in Acinetobacter baumannii
Acinetobacter baumannii is an important microorganism involved in hospital-acquired infections with a remarkable ability to develop resistance to multiple antibiotics (multidrug-resistance, MDR) which makes it a highly troublesome pathogen in many hospitals around the world. Third-generation …
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Metabolic network reconstruction and genome-scale model of butanol-producing strain clostridium beijerinckii ncimb 8052
… or replacement. C. beijerinckii is an attractive microorganism for strain design to improve butanol production because it (i) naturally produces the highest recorded butanol concentrations as a byproduct of fermentation; and (ii) can co-ferment pentose and hexose sugars (the primary products from …
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Development and application of time-temperature integrators to thermal food processing
… on an amylase secreted by the hyperthermophilic microorganism Pyrococcus furiosus. This microorganism exists in extreme conditions where it metabolises in boiling volcanic pools; with elemental sulphur readily available, in water of high salinity, and in a reducing atmosphere. The amylase it …
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Studies of the orientational order and bilayer thickness in biological and model membranes
… fatty acid of increasing unsaturation. The microorganism was grown under conditions where de novo fatty acid biosynthesis was suppressed. At 37°C, the growth temperature, there exists a range of hydrocarbon order compatible with good growth characteristics of the microorganism and outside of …
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A possible mechanistic role for microorganisms in the genesis of colorectal cancer.
… instability and mutations is unknown. Microorganisms are shown to be involved in other cancers so it is possible one may be involved with CRC. Identification of the organism may help prevention, diagnosis and treatment. Previous work in our lab identified the presence of JC virus (JCV) …
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Hydrodynamics of swimming microorganisms in complex fluids
<p>Swimming motion of microorganisms, such as spermatozoa, plankton, algae and bacteria, etc., ubiquitously occurs in nature. It affects many biological processes, including reproduction, infection and the marine life ecosystem. The hydrodynamic effects are important in microorganism swimming, …
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An investigation of substrate removal and storage in the activated sludge process
… to investigate what effect the concentration of microorganisms would have on substrate removal, microbial substrate storage, and oxygen utilization at a constant food-to-microorganism ratio. Batch experiments were conducted, under aerated and completely mixed conditions, using a domestic …
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Defining the tropism of Listeria monocytogenes using a comparative genomics approach
… features responsible for the tropism of the microorganism for clinical, food and environmental niches. Comparative genomic techniques, namely mixed-genome microarrays, dot-blot hybridization and suppressive subtractive hybridization were used to compare the genomes of L. monocytogenes …
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Species Richness and Ecological Diversity of Myxomycetes and Myxomycete-Like Organisms in the Tropical Forests of Brazil
… the knowledge regarding the heterogeneity of microorganism species that compose the Brazilian microbiota increases slowly. Therefore, urgent efforts should be directed to the carrying out of inventories and studies on the species that make up the Brazilian microbiota, their biogeographical …
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Cytological and biochemical analyses of Wolbachia pipienitis, causative reagent of cytoplasmic incompatibility in Drosophila simulans
… CI has been correlated to an intracellular microorganism called Wolbachia pipientis. The expression of CI results when males infected with the symbionts are crossed with uninfected females; whereas reciprocal crosses between infected females and uninfected males are compatible, as well as …
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Estudo dos microrganismos no contexto escolar: Intervenção pedagógica em uma escola estadual do município de João Pessoa – PB.
… issues that permeate our learning, the theme of microorganisms is present and necessary as these are constantly present in our daily lives, whether through food, medicine, fuel and others. The purpose of this study was to identify and analyze, from a psychological meaning network, the knowledge …
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Avaliação do perfil bacteriológico de salsichas tipo "hot dog" tradicional e de frango comercializadas nos municípios do Rio de Janeiro e Niterói-RJ com determinação de atividade de água e pH
… to consume, with the isolation of every microorganism researched. About aw, we could observe the microorganism growth in smaller values than the ones described by the literature. According to these results, we can conclude that the hot dog sausages may cause foodborne illness, …
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