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 265 for “"Pathogenic bacteria"”.
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Quorum Sensing and Virulence Regulation in Commensal and Pathogenic Bacteria
Quorum sensing (QS) is a peptide-mediated bacterial communication process that regulates collective behaviors including genetic competence, biofilm formation, virulence, and horizontal gene transfer. In streptococci, QS commonly occurs through the ComABCDE and ComRS signaling pathways, which …
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Biochemical Studies of Peptidoglycan Hydrolases from Commensal and Pathogenic Bacteria
<p>The intestinal microbiota consists of diverse bacterial species and their effectors that play key roles in regulating human health. Interestingly, cell wall, or peptidoglycan, fragments from commensal and pathogenic bacteria can activate host immunity. The mechanism(s) by which immunologically …
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Synthesis, Characterization and Evaluation of Novel Treatment against Resistant Pathogenic Bacteria
… conjugated with selected nanoparticles against pathogenic microorganisms. Furthermore, this study investigated the efficacy of selected antibiotics when conjugated with nanoparticles against selected pathogenic microbes. METHODS: Pyrenacantha grandiflora Baill (tubers) were collected from Masisi …
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Utilization of ferrioxamine microarrays for the rapid detection of pathogenic bacteria
… are low-molecular weight species utilized by bacteria for the sequestration of iron, an essential nutrient. Siderophores and their cognate receptors are considered to be virulence factors, due to their prominent role in pathogenicity. The work presented here focuses on ferrioxamine (FOx) as an …
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Reversible Germline Dynamics of Caenorhabditis elegans During Exposure to Pathogenic Bacteria
… well-characterized animal model that encounters pathogenic microbes in its natural environment. How these pathogens affect the reproductive capacity of C. elegans is not well understood. In this thesis, I examine the effect that exposure to the Gram-negative pathogenic bacteria Pseudomonas …
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Efficacy and impact of sanitizers in controlling pathogenic bacteria on irrigation water
… NTU), contact times (CT: 3 or 5 minutes), and bacterial concentrations of EHEC, SM, or LM at 6 and 3 log CFU/mL per EPA 2020 guidelines. Treatments that achieved a 3-log reduction of the selected organisms within a 5-minute contact time, with no viable cells after enrichment, were considered …
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Effects of phytogenics on intestinal pathogenic bacteria and microbiota of non-ruminants
Increased levels of multi-drug resistant bacteria worldwide pose a significant threat to human and animal health. The recommendations in the WHO’s global action plan were to phase out and research alternatives to using antibiotics in animal farming. This study aims to identify natural plant …
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Autoinducer-2-based quorum sensing of foodborne pathogenic bacteria under food related conditions
… dependent cell-to-cell signaling) of foodborne pathogenic bacteria in food environments. Under the conditions of these studies, AI-2 activity of Salmonella and Escherichia coli O157:H7 was not associated with rate of bacterial growth. Production of AI-2 was increased in the presence of glucose …
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Control of pathogenic bacteria in Queso Fresco by using generally recognized as safe ingredients
… were stored at 4˚C or 8˚C for 3 weeks and the bacterial count was determined every other day by direct plating onto PALCAM, bismuth sulfate, or sorbitol MacConkey agar. All nisin and caprylic acid combinations were effective to decrease survival and growth of all L. monocytogenes and caused at …
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Chemical and biological evaluation of antibiotic-based ionic liquids and GUMBOS against pathogenic bacteria
… of activity as a viable alternative to combating bacterial infections. The first part of this research provides the physical characterization and subsequent in vitro antimicrobial activity of ampicillin-based ILs consisting of several different quaternary ammonium compounds (QACs) on Escherichia …
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Exploring Interactions of Phyllosphere Epiphytes with Plant Pathogenic Bacteria Pseudomonas and Xanthomonas on Tomato
… against common tomato <em>phyllosphere</em> bacterial pathogens, <em>Pseudomonas syringae</em> pv. tomato and <em>Xanthomonas perforans</em>. Additionally, this study uses X. <em>perforans</em> wild-type and X. <em>perforans</em> type VI secretion system (T6SS) mutant strains to observe the …
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Novel Strategies towards the Inhibition of ATP-Binding Cassette (ABC) Transporters from Pathogenic Bacteria
… (ABC) superfamily play critical roles in pathogenic bacteria. These transport systems are particularly important in conferring antibiotic resistance on the cell by mediating the efflux of a wide range of structurally unrelated compounds and the transport of lipids that form antibiotic …
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