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 45 for “"Phototrophic"”.
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In situ Metabolism and Biogeography of Phototrophic Consortia
… and in situ carbon metabolism of phototrophic consortia<< A dense population of the phototrophic consortium "P. roseum" was investigated in the chemocline of a temperate holomictic lake (Lake Dagow, Brandenburg, Germany). Fluorescent in situ hybridization revealed that the …
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Paleolimnological Reconstruction of Long-Term Trends in Phototrophic Communities in Prairie Reservoirs
… trends in organic input and changes within the phototrophic (algal) community, with a primary focus on cyanobacteria and associated toxins. Sediment cores were collected from Lake Diefenbaker (the test case site) and two smaller Prairie lakes, Buffalo Pound Lake, Saskatchewan (eutrophic lake …
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Quantitative analysis of anaerobic and phototrophic treatment technologies to advance resource recovery from wastewaters
… development of alternative (i.e., anaerobic and phototrophic) wastewater treatment technologies to fully realize the potential chemical energy of wastewater and to improve the environmental and economic sustainability of wastewater infrastructure. Anthropogenic activities are negatively impacting …
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Distributions and diversity of aerobic anoxygenic phototrophic bacteria along onshore offshore transects near Pacific Islands
Aerobic anoxygenic phototrophic bacteria (AAP's) population abundances are not well characterized, in spite of their potential importance for the microbial loop and primary production. AAPs have a photoheterotrophic metabolism, thus both inorganic and organic nutrients, as well as physical …
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Seasonal and Diel Patterns of Abundance and Productivity of Phototrophic Picoplankton in the Lower Chesapeake Bay
<p>This study was performed to evaluate phototrophic pico-plankton (0.2 to 2.0 μm) dynamics within the lower Chesapeake Bay. A 15 month study of phototrophic picoplankton abundance and productivity was made from June 1988 to October 1989. Annual picoplankton abundance using epifluorescence …
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Molecular mechanisms behind the adjustment of phototrophic light-harvesting and mixotrophic utilization of cellulosic carbon sources in Chlamydomonas reinhardtii
Plants, green algae and cyanobacteria perform photosynthetic conversion of sunlight into chemical energy in a permanently changing natural environment, where the efficient utilization of light and inorganic carbon represent the most critical factors. Photosynthetic organisms have developed …
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Method development for the characterization of intrinsic and extant kinetic parameters in microalgal cultures
… that we have robust, mechanistic models of phototrophic bioprocesses to predict performance under varying environmental conditions (light intensity, nutrient concentration, etc.). As we seek to develop such models, we must also have reliable approaches to calibrate and validate key …
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Interactions of Fe(II) with the iron oxidizing bacterium Rhodopseudomonas palustris TIE-1
… TIE-1 showed that three genes were required for phototrophic growth with Fe(Il): PioA, a decaheme cytochrome, PioB, an outer membrane porin, and PioC, a high potential iron protein (HiPIP). These proteins suggested a model of Fe(II) oxidation that ends with transfer of electrons to the …
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Effect of Crude Oil on Light Attenuation and the Resulting Impacts on Marine Microbial Phototrophs and Heterotrophs
… in light intensity would affect microbial phototrophic community composition, which in turn would alter the heterotrophic community and potentially the rate of hydrocarbon degradation. Experiments were conducted using natural seawater with a crude-oil layer (but not in contact with), a …
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Advancing sustainable wastewater treatment: elucidating tradeoffs among emerging resource recovery technologies through quantitative sustainable design
… was conducted comparing several anaerobic and phototrophic technologies to determine their potential for energy positive domestic wastewater treatment. Phototropic processes were shown to be able to produce 280-400% greater energy than anaerobic processes producing methane (on a per m3 basis). …
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Gene transfer history of carbon fixation proteins constrains marine cyanobacteria divergence times
… (purple sulfur bacteria), a group of phototrophic Gammaproteobacteria. While many of these genes are highly conserved and thus yield poorly resolved phylogenies, their concatenation clarifies a shared evolutionary history. This work integrates gene transfer with molecular clock …
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MICROBIAL COMMUNITY ASSEMBLY AND DIVERSIFICATION OF THE GENUS CHLOROFLEXUS ALONG AN ALKALINE HOT SPRING GRADIENT
… their community assembly patterns. Specifically, phototrophic groups show the strongest evidence for non-random assembly, most likely due to competition for light. A major exception to this pattern is the genus Chloroflexus, a major member of these communities. Members of this genus primarily grow …
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MICROBIAL COMMUNITY ASSEMBLY AND DIVERSIFICATION OF THE GENUS CHLOROFLEXUS ALONG AN ALKALINE HOT SPRING GRADIENT
… their community assembly patterns. Specifically, phototrophic groups show the strongest evidence for non-random assembly, most likely due to competition for light. A major exception to this pattern is the genus Chloroflexus, a major member of these communities. Members of this genus primarily grow …
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Diversity of polycyclic triterpenoids in Rhodospirillum rubrum
… under aerobic, anaerobic, heterotrophic and phototrophic conditions and detected a variety of bicyclic, tricyclic, tetracyclic and pentacyclic triterpenoids, derived from the enzymatic cyclization of squalene and produced in amounts comparable to diploptene. Identified compounds included …
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The role of glycogen Metabolism in the Adaptation to environmental Changes of the cyanobacterium Synechocystis sp. PCC 6803
… importance of glycogen in the transition from phototrophic to photomixotrophic growth. Glucose supplementation induces metabolic adaptations and glycogen accumulation, with limited glycogen synthesis proving detrimental to photomixotrophic growth, causing significant metabolic and …
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Investigating cultivation and biorefinery process techniques on the microalgae Porphyridium aerugineum and Chromochloris zofingiensis
… multiple products from P. aerugineum began with phototrophic growth that was scaled-up from 900mL bottles to a 66L airlift PBR. In the PBR, a maximal biomass concentration of 1.47g/L and a phycocyanin concentration of 139.3mg/L were obtained over 21 days. Both values show the potential …
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Complex lipids in microbial mats and stromatolites of Hamelin Pool, Shark Bay, Australia
… sulfate-reducing bacteria and anoxygenic phototrophic bacteria and archaea could be inferred. The presence of the rare 3-methylhopanoids was discovered in a significant portion of the samples, which could add to the characterization of this molecule, which has only been concretely linked …
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Thermotolerant purple nonsulfur bacteria from New Zealand geothermal areas
… by sequences attributable to aerobic anoxygenic phototrophic bacteria. Four novel pufL sequences attributable to purple nonsulfur bacteria were obtained. Rhodoplanes strains possessed the ability to use nicotinic acid as sole source of carbon and nitrogen, via a pathway that includes …
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METHYLATED AMINE-UTILISING BACTERIA AND MICROBIAL NITROGEN CYCLING IN MOVILE CAVE
… entering the cave, life is sustained by non-phototrophic microorganisms such as sulfur and methane oxidisers. Also present are methylotrophs that use one-carbon compounds such as methanol and methylated amines as their sole source of carbon and energy. Produced during putrefaction, methylated …
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The suitability of the microalgal metabolism for the recovery of nutrients from wastewater: the implications of solids residence time and diel cycles
… relevant body of work regarding the potential of phototrophic microalgal systems to become an integral part of a water resource recovery process, and the implications of solids residence time (SRT) and diel cycles on microalgal metabolism influencing wastewater treatment. Experimental results …
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