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 67 for “"Heterotrophic bacteria"”.
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Interactions between selected metal compounds and marine heterotrophic bacteria
… toxicity of several metal compounds to selected bacteria. The technique was based on the agar diffusion method. Reliability and reproducibility were enhanced by careful standardisation of experimental parameters. By quantification of the concentration of metal compounds in the media using …
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Physiological and Phylogenetic Studies of the Biogeography of Alkaliphilic Heterotrophic Bacteria from Serpentinizing Habitats
Serpentinization occurs when ultramafic rocks containing the mineral olivine react with water to produce highly reducing conditions, which are commonly coincident with high concentrations of hydrogen. Hydrogen provides an energy source for microbial metabolism and in combination with mineral …
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Elucidating Factors that Impact the Removal of Organic Microconstituents by Ammonia Oxidizing and Heterotrophic Bacteria
… inactivated biomass samples (ammonia oxidizing bacteria (AOB), laboratory enriched heterotrophic cultures free of active nitrifiers with low (Ox⁻) or high (Ox⁺) oxygenase activity, and a nitrifying activated sludge (NAS) from a full-scale wastewater treatment plant) to determine whether …
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Interannual Differences in Nutrient Dynamics During a Brown Tide Bloom (<i>Aureococcus anophagefferens</i>) and the Interaction of <i>A. anophagefferens</i> with Heterotrophic Bacteria
… contribution of <em>A. anophagefferens</em> and heterotrophic bacteria to total carbon and nitrogen uptake rates was also examined by using flow cytometry. Results demonstrated that it is possible to distinguish and quantify taxon-specific uptake of C and N by <em>A. anophagefferens</em> versus …
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The microbial biochemistry of slow sand filters.
… of slow sand filters consists predominantly of bacteria. Throughout the year, heterotrophic bacteria were isolated from the schmutzdecke of slow sand filters at Invercannie Water Treatment Works, as the by-products of ozonation will provide these bacteria with a fairly constant supply of …
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The exo-proteomic framework for nitrogen acquisition from proteinaceous organic matter in the model marine heterotroph Ruegeria pomeroyi DSS-3
… organic matter, and their rapid degradation by heterotrophic bacteria is an important process in releasing bioavailable nitrogen when other nitrogen containing substrates are deficient. Heterotrophs encode a wide variety of hydrolytic enzymes and nutrient transporters, which provide them with …
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Microbiological Quality of Ultrasonic Dental Scaler Output Water
… narrow-diameter waterline tubing susceptible to bacterial biofilm growth, this study determined the cultivable prevalence of aerobic mesophilic heterotrophic bacteria in ultrasonic scaler output water subjected to one of two commercial biocides favorably reviewed by the American Dental …
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Siderophore cycling in the North Pacific Subtropical Gyre
… growth of microbes, including phytoplankton and heterotrophic bacteria. In order to adapt to chronic low Fe conditions, some heterotrophic bacteria are able to produce siderophores, which are small organic ligands with extraordinarily high stability constant for Fe(III), to facilitate Fe uptake. …
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Characteristics of cone-forming cyanobacteria and implications for the origin of conical stromatolites
… stromatolites. To elucidate the role of the cyanobacteria, we enrich cyanobacteria from modern hot-spring communities of cone-forming microbes and subsequently test how the formation of conical structures depends on individual strains of the community. In our analysis, we augment morphological …
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Investigation of prey ingestion and digestion in the ciliate predator Tetrahymena pyriformis and the impact on growth
… included several strains of live RFP-expressing heterotrophic bacteria (Live), heat-killed-DTAF-stained heterotrophic bacteria (Dead), live autotrophic Synechococcus species (Pico) together with fluorescently-labelled microspheres (FLMs). Prey biovolume did not affect ingestion rates over the 5 …
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Studies of the cloning and expression of Thiobacillus Ferrooxidans Plasmid and Nitrogenase genes
… sequencing and expression in a variety of heterotrophic bacteria and in vitro systems of the T. ferrooxidans nitrogenase structural genes were studied.
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Relationship Between Organic Carbon and Opportunistic Pathogens in Simulated Premise Plumbing Systems
… have extensive understanding in control of heterotrophic and coliform bacteria re-growth in water distribution systems via disinfection, control of assimilable organic carbon (AOC), and biologically degradable organic carbon (BDOC). However, much little is known about the effect of AOC on …
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Microbial Reduction of Perchlorate in Fixed Bed Biofilm Reactors for Water Treatment
… describing the competition between PRB and other heterotrophic bacteria and the effect of mass transfer was developed. Parameter estimation was performed using a modified Generalized Likelihood Uncertainty Estimation (GLUE) approach. The model is used to evaluate the influence of mass transfer …
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Heterotrophic Microbial Colonization of the Interior of Shocked Rocks from the Haughton Impact Structure, Devon Island, Nunavut, Canadian High Arctic
… we present a characterization of the heterotrophic endolithic community and its environment in the interior of impact-shocked gneiss and breccia samples from Haughton Impact structure on Devon Island, Nunavut, in the Canadian High Arctic. The high-latitude and arid, polar climate at …
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Experimental and Theoretical Study of Carbon Dynamics in an Algal-Bacterial Co-Culture
… and can be subsequently metabolised by heterotrophic bacteria, therefore heterotrophic bacteria play an important role in determining the fate of fixed carbon. In order to understand how carbon is transported within ecosystems it is important to study the metabolic processes, like …
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The deterioration of concrete by heterothrophic bacteria and fungi
… has focused on the effect of sulphur or nitrogen bacteria, this study has investigated the effect of the lesser documented heterotrophic bacteria and fungi on concrete deterioration, and their possible use within a biodecontamination system. A number of heterotrophic bacteria and fungi were …
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Iron limitation and the role of Siderophores in marine Synechococcus
Marine cyanobacteria in the genus Synechococcus are widely distributed and contribute significantly to global primary productivity. In many parts of the ocean their growth is limited by a lack of iron, an essential nutrient that is virtually insoluble in seawater. To overcome this, Synechococcus …
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The Development of a Bacterial Biosensor Designed to Detect Oxidative Chemicals in Water: Correlating Sensor Relevance to Mammalian Brain Cells and Assessing Bacterial Cell Immobilization Strategies
… multiple stress responses may be activated in bacteria and several disorders including neurodegenerative disorders may occur in mammalian organisms. Oxidative chemicals also have negative effects on engineered water systems as an oxidative stress response in bacteria has been implicated to …
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Ecology and physiology of bacterial activity in a temperate saltmarsh lagoon, with an emphasis on nitrogen fixation
Heterotrophic bacterial activity and nitrogen fixation are fundamental to nutrient regeneration and nitrogen cycling in saltmarsh ecosystems. Ecological and physiological aspects of bacterial production and nitrogenase activity in marine sediments and water were examined in Langebaan Lagoon, a …
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