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 43 for “"Heterotrophs."”.
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Effect of Crude Oil on Light Attenuation and the Resulting Impacts on Marine Microbial Phototrophs and Heterotrophs
Oil spills spread over the surface of the seawater which cause the attenuation of light passing through it. Then, we showed that crude oil preferentially attenuates the shorter wavelengths of photosynthetically active radiation. Therefore, we proposed that this change in the spectrum and reduction …
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Algal and bacterial interactions in producing precursors of trihalomethanes and other halogenated organics
… from continuous light assays indicated that heterotrophs, grown in the same culture vessel with algae, affected an increase in the potential of chlorinated culture filtrate to form THMs. No significant changes in TOX-formation potential were observed. Heterotrophs grown in volumes of algal …
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Ciliate micrograzer dynamics of the New England Shelf
… as consumers of unpigmented bacteria and other heterotrophs) can also be recorded. Staining IFCB (IFCB-S) revealed higher abundances of grazers than the original IFCB, as well as some cell types not previously detected. To analyze a 10-year time series of herbivorous ciliates at MVCO and address …
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Trophic transfer of nearshore basal resources: interpreting fatty acid and stable isotope biomarkers
Benthic heterotrophs living in aphotic aquatic habitats rely upon subsidies of detrital energy, in the form of complex organic molecules, which are synthesized by macrophytes and phytoplankton in the photic zone. Identifying the relative importance of different basal energy resources to consumers …
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Ciliate micrograzer dynamics of the New England shelf
… as consumers of unpigmented bacteria and other heterotrophs) can also be recorded. Staining IFCB (IFCB-S) revealed higher abundances of grazers than the original IFCB, as well as some cell types not previously detected. To analyze a 10-year time series of herbivorous ciliates at MVCO and address …
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Uptake and utilization of alanine-1-14C by freshwater algae.
… These species were concluded to be facultative heterotrophs.
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Oxygen, pH, and labile organic carbon as possible mechanisms for algal stimulation of bacterial and fungal production in periphyton
… can stimulate production of associated microbial heterotrophs; however,the mechanisms for this stimulation remain unknown. I incubated submerged Typha domingensis leaf litter in greenhouse mesocosms under low- and high-nutrient regimes and conducted microbial production assays after 79/80 (week …
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Investigation of the microbial populations in the activated sludge of the Hoechst-Celanese wastewater treatment plant
… Hoechst-Celanese activated sludge were examined. Heterotrophs, denitrifiers, sulfate-reducers, protozoa and filamentous bacteria were enumerated. Variations in microbial populations were compared with influent and effluent constituent concentrations, and with aeration basin characteristics, such …
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Mechanistic modeling of bacterial nutrient uptake strategies
… of marine oligotrophic and copiotrophic heterotrophs; and (iii) an exploration-conservation trade-off governs the prevalence of motility in the marine microbial world. This work thus provides new understanding of how both phenotypic diversity and cellular regulation are governed by …
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Linking Heterotrophic Metabolism and Nutrient Uptake in Headwater Streams
Autotrophs and heterotrophs differ in their demand, acquisition and use of materials, but fundamentally nutrient demand is inherently linked to metabolism based on the stoichiometry of biochemical reactions. The differences between these two groups of organisms confound straightforward regression …
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The effects of nickel on organic removal and nitrification in the completely mixed activated sludge process
… the same time, the nickel appeared to stress the heterotrophs and to cause an increase in their maintenance energy requirement. Nitrification was found to be inhibited by the low nickel concentration, and this inhibition was not reduced by operating the reactors at lower COD:TKN ratios.
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Effects of copper on benthic communities in artificial microcosms
… producers are more sensitive to copper than heterotrophs. Additionally, adverse effects on periphyton were observed at concentrations well below measures of chronic toxicity to organisms dependent on periphyton as a trophic resource and the chronic criteria for copper. As such, greater …
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The exo-proteomic framework for nitrogen acquisition from proteinaceous organic matter in the model marine heterotroph Ruegeria pomeroyi DSS-3
… nitrogen containing substrates are deficient. Heterotrophs encode a wide variety of hydrolytic enzymes and nutrient transporters, which provide them with the ability to sustain nutrient stresses and inhabit protein-rich niche habitats such as sinking or suspended particles. Despite their …
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Development of 13C Fingerprint Tool and Its Application for Exploring Carbon and Energy Metabolism in Cyanobacterium Synechocystis sp. PCC 6803
… will provide much higher carbon yield than heterotrophs by co-utilizing organic carbons and CO2. However, the quantitative information of such `photo-fermentation' process is still limited. Decoding the carbon metabolism of cyanobacteria during the photo-fermentation process can reveal the …
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Ecology and biogeochemistry of fluvial microphytobenthic communities on soft sediments
… a change in interactions between autotrophs and heterotrophs, and indicated the first known example of shifting facilitation/competition found in MPB communities on natural sediment. Potential nutrient flux was also shown to vary between geology and light levels, with differences being found …
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Advancing sustainable wastewater treatment: elucidating tradeoffs among emerging resource recovery technologies through quantitative sustainable design
… primarily based on the cultivation of aerobic heterotrophs and though it provides a high-quality effluent, it is also energy intensive. High energy demand is costly both economically and environmentally. These problems underlie a need to re-envision WWTPs as a resource capable of nutrient and …
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Using Oligonucleotide Probes to Characterize Nitrification in a Two-Stage Pilot Scale Biological Aerated Filter System
… BAF system is likely to be competition between heterotrophs and autotrophs.
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Effects of an herbicide on a planktonic food web
… Many cells <9 um may be facultative or obligate heterotrophs and not susceptible to simazine. Although data were variable, bacteria were also not affected by phytoplankton changes or simazine. Rotifers were the major zooplankters and the two dominant species, Kellicottia bostoniensis and …
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Changes in respiration rates and biomass attributes of epilithon due to extended exposure to zinc
… to controls, and presence of zinc-tolerant heterotrophs.
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Microbial interactions associated with biofilms attached to Trichodesmium spp. and detrital particles in the ocean
… interaction between marine primary producers and heterotrophs and crucial components of the biological pump. Biofilm communities associated with Trichodesmium thiebautii colonies in the Sargasso Sea differed considerably from seawater microbial communities. In addition, there was no overlap …
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