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 79 for “"bacterial population"”.
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Recovering from Dormancy: Fixation of CSM6-Inducing Spacers in the Bacterial Population
… common in prokaryotes and confer defense at the population level – infected cells will sacrifice themselves to inhibit the propagation of the invader, saving uninfected cells in the population from infection. It has long been assumed that Csm6 confers immunity through an abortive infection …
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Analogue enrichment of aromatic degradation through application of lignin-derived phenols
… dominance of existing enzymatic activities of bacterial population responsible for degradation of polycyclic aromatic hydrocarbons (PAHs) in PAH-contaminated urban soils using naturally occurring lignin-derived phenols (13C-vanillin substrates). The influence of vanillin substrates on the …
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Diurnal Variation Patterns in the Rumen of Cattle: Studies of Bacterial Numbers, Carbohydrate-Specific Groups and Ruminal Fluid Parameters
… in the size and composition of mixed rumen bacterial populations in cattle fed either high forage or high concentrate diets (maintenance intake levels) was followed after a once daily feeding. Samples of ruminal contents were collected from rumen-fistulated, Holstein steers at -1, +2, 4, 8, …
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Survival of ice nucleation-active and genetically engineered inactive strains of Pseudomonas syringae
… strain were subjected to freezing temperatures. Populations of the INA strain increased 15-fold in the 18 hours after oat plants incurred frost damage at {dollar}-{dollar}5 and {dollar}-{dollar}12{dollar}\sp\circ{dollar}C. Plants colonized by the non-INA strain were undamaged at …
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An Experimentally-validated Agent-based Model to Study the Emergent Behavior of Bacterial Communities
… dependent regulation of gene expression), bacterial population dynamics and emergent behavior play a key role in regulating their own life and their impact on their immediate environment. Computational models that accurately and robustly describe bacterial population behavior and response …
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Survival of Vibrio vulnificus and Escherichia coli in artificially and naturally infected oyster (Crassostrea virginica) tissues during storage in spray- and immersion-type live holding systems
… (p = 0.12) in the artificially-inoculated bacterial population of oysters after 120 hr of storage in a spray live holding tank. The level of E. coli in oysters which were subject to physiological stress did not change significantly (p = 0.30) after 96 hr in the spray tank. Naturally-present …
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An investigation into the relationship between process kinetics and microbial community dynamics in a lactate-fed sulphidogenic CSTR as a function of residence time and sulphate loading
… of electron donor, constituents of the microbial populationmediating the process, the feed sulphate concentration and other operationalparameters. The current work investigated the potential of an ecological approach inthe treatment of sulphate-laden wastewaters. This was based on the …
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Population oscillations in continuous culture of the prey-predator systems Escherichia coli - Dictyostelium discoideum and Proteus vulgaris - Dictyostelium discoideum
An investigation of expected population oscillations in a continuous flow culture of prey-predator interactions was made. A Coulter Counter was used to enumerate the population levels and periodic checks were performed with a Petroff-Hausser bacterial counts. Population oscillations of both prey …
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Microbial Dynamics and Mechanistic Insights into a Hydrogenotrophic Denitrifying Microbial Consortium
… strain, now representing over 60% of the bacterial population. This shift led to an enhanced system performance by mitigating observed lag phases (from 48 hours down to 24 hours). More interestingly, when exposed to low salinity conditions (1% to 2%), the previously observed lag phases …
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Molecular Characterization of Spinach (Spinacia Oleracea) Microbial Community Structure and its Interaction With Escherichia coli O157:H7 in Modified Atmosphere Conditions
… objective of this study was to characterize the bacterial communities of fresh and packaged spinach leaves and to explore interactions with E. coli O157:H7. We assessed the bacterial diversity present on the spinach leaf surfaces and how parameters such as spinach cultivar, field conditions, …
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Bioleaching and electrobioleaching of sulfide minerals
… reduction of Fe(III) would increase the bacterial population and in turn would accelerate the leaching of the mineral.;It has been found that the electrobioleaching of chalcopyrite and pyrite is superior to the bioleaching in particular with respect to the fact that leaching conversion is …
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The Removal of Low Levels of Phenol by Activated Carbon in The Presence of Biological Activity
… carbon columns through use of parallel bacterially seeded and non-seeded, non-bioactive columns. Phenol degrading organisms were taken from an enrichment using phenol as sole carbon source. Mass balance calculations on phenol and dissolved oxygen were used to estimate amounts of …
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Investigation of the Interactions Between Sanitizers, Surface Characteristics, Washing Conditions, and Bacteria for Improving Microbial Safety of Fresh Produce
… ability in the reduction of E. coli O157:H7 populations on cantaloupes and fresh-cut apples, followed by AEW and chlorine. The sequential treatment of AEW followed by Calcium Ascorbate exhibited a good browning control ability and helped to extend shelf life of fresh-cut apples. The aqueous …
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Mechanistic modeling of bacterial nutrient uptake strategies
… for a variety of applications, from predicting bacterial population dynamics and thus carbon-cycling rates in the ocean to bio-engineering bacteria into microscale robots. Here I use toy, mechanistic models of single-cell metabolism that allow me to quantify the costs and benefits of various …
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Differential Expression Analysis of Type II Toxin-Antitoxin Genes of Pseudomonas aeruginosa PAO1 under Different Environmental Conditions
Bacterial persistence is considered as one of the primary reason for antibiotic tolerance besides genetically acquired antibiotic resistance. Persisters are the subpopulation of a clonal bacterial population, which can survive environmental extremes and become invulnerable to stresses due to …
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MODELING REORGANIZATION OF PCF10-INDUCED COMPLEX STRUCTURES IN ENTEROCOCCUS FAECALIS UNDER ERYTHROMYCIN TREATMENT
… the complex structures increase, and the total bacterial population doubles. In this dissertation, we present a series of models developed to capture the multi-scale effects driving this biofilm restructuring, employing both individual-based and continuum-based frameworks to uncover the …
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An investigation of the microbial population in aquarium water, using next generation sequencing
… genes (ARG) are widely transferred among bacterial communities. As a result, superbugs possessing several antibiotic resistant genes are a significant threat to public health. Antibiotic resistant pathogens in drinking water or wastewater could therefore influence public health. The aim of …
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Generation of SOS inhibitors as co-drugs to potentiate the activity of bactericidal antibiotics and to block the emergence of antibiotic resistance
… by selection for pre-existing mutants in the bacterial population exposed to antibiotics. In contrast, recent data suggested that mutations evolve after cells encounter antibiotic therapy. This kind of mutation is known as adaptive mutation, which is activated by the SOS DNA repair and …
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Mikrobielle Ökologie N-Acyl-L-Homoserinlacton-produzierender Bakterien in der Rhizosphäre von Tomatenpflanzen
… were used to examinate shifts of the bacterial population in the rhizosphere on tomato plants. The effective in situ production and spreading of AHL on tomato roots was demonstrated with P. putida IsoF using an AHL-sensor strain P. putida F117 pKR-C12. AHL was produced in effective …
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The prevalence of toxin-antitoxin systems and their tractability as novel antimicrobial targets
… to ensure their persistence and inheritance in a bacterial population. One example is the proteic toxin-antitoxin (TA) system, consisting of a toxin and an antitoxin encoded in a single operon. When expressed, the antitoxin binds to and neutralizes the toxin. However, if during cell division a …
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