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 119 for “"autotrophic"”.
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Autotrophic nitrogen removal and relevant equilibrial processes
Viimastel aastakümnetel on tehtud ridamisi avastusi, mis on oluliselt täiendanud teadmisi loodusliku lämmastikuringe kohta. Üks olulisemaid neist on reoveepuhastuses kasutatav anammoks-protsess, mis toimub Planctomycetes hõimkonda kuuluvate autotroofsete bakterite vahendusel ja mille käigus …
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A novel membrane process for autotrophic denitrification
… using hydrogen-oxidizing bacteria. Autotrophic denitrification is a biological process that reduces nitrate to nitrogen gas using an inorganic carbon source. Hydrogen gas is an electron donor and nitrate is the electron acceptor in the reaction. The specific research objectives were …
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Synthetic Biology for Autotrophic and Heterotrophic Production of Ethanol
<p>Growing energy demand and rising levels of greenhouse gases has put massive strain on the global environment. Alternatives to fossil fuels are being developed in an attempt to curb climate change. Biotechnology has made large strides in order to create a completely renewable energy source by …
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Effects of Landscape Disturbances on Autotrophic Processes Within Arkansas Ozark Streams
… of implemented BMPs at reducing impacts to autotrophic processes in headwater streams and the South Fork Little Red River. There were no differences between reference and impacted sites before and after the disturbance occurred for the autotrophic processes measured. These results suggest …
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Interactions Between Heterotrophic and Autotrophic Bacteria in Fixed-Film Biological Processes Used in Drinking Water Treatment
Biological nitrification in water treatment is largely used in Europe to remove ammonia before the final disinfection step. In order to simulate this process in the laboratory, a scaling procedure for biofilm processes was developed and evaluated. Experiments conducted with these laboratory-scale …
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Characterization of the autotrophic component in periphyton upon <i>Typha angustifolia</i> detritus in a freshwater wetland
<p>The autotrophic component of periphyton on <em>Typha angustifolia</em> detritus was characterized in a freshwater wetland during a single growing season. 58 genera of algae and cyanobacteria, representing six divisions, were observed throughout the study period. Although the combined …
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Heavy metal concentrations, primary productivity, chlorophyll-a levels, and the autotrophic indices of stream periphyton subjected to wood preservation waste
… primary productivity, chlorophyll-a content, and autotrophic index were also determined. Water samples were analyzed for the three metals; arsenic, chromium, and copper. The highest mean periphyton arsenic and chromium concentration occurred at the station 1.2 miles below the site of …
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The Short-term Effects of Fertilization on Total Soil CO2 Efflux, Heterotrophic, and Autotrophic Respiration of Loblolly Pine (Pinus taeda L.)
Fertilization is a common, cost effective treatment for increasing forest productivity within managed forests of the southeastern United States. However, little is known about how fertilization affects the below-ground processes that drive soil CO2 efflux in loblolly pine (Pinus taeda L.). A …
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Develop a Sulfur-driven Autotrophic Denitrification Process for The Treatment of Industrial Wastewater Containing High Levels of Salinity in an Alkaline Environment
… a rapid start-up procedure for Sulfur-driven Autotrophic Denitrification (SdAD) tailored for the remediation of wastewater with varying salinity levels, mainly targeting saline industrial wastewater with specific alkalinity. The study focused on evaluating the efficiency of two systems, …
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Productivity and carbon sequestration potential of seagrass ecosystems in the eastern Aegean Sea
… Natural ecosystems,which typically form net autotrophic habitats such as seagrass meadows, could be crucial to counteracting CO₂ emissions. Increased fragmentation of Posidonia oceanica seagrass meadows within the eastern Mediterranean basin, linked to increased sea surface temperature, …
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A study of nitrification kinetics
One autotrophic and two heterotrophic chemostats were operated during the study period. The autotrophic unit was operated using an inorganic synthetic ammonium medium to provide a culture of nitrifying organism and to study cell yield. The two heterotrophic units were operated with a feed …
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Productivity, metabolism and physiology of free-living chemoautotrophic Epsilonproteobacteria
Chemoautotrophic ecosystems at deep-sea hydrothermal vents were discovered in 1977, but not until 1995 were free-living autotrophic Epsilonproteobacteria identified as important microbial community members. Because the deep-sea is food-starved, the autotrophic metabolism of hydrothermal vent …
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Productivity, metabolism and physiology of free-living Chemoautotrophic Epsilonproteobacteria
Chemoautotrophic ecosystems at deep-sea hydrothermal vents were discovered in 1977, but not until 1995 were free-living autotrophic Epsilonproteobacteria identified as important microbial community members. Because the deep-sea is food-starved, the autotrophic metabolism of hydrothermal vent …
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Evaluation of a Microalgal Bioassay Based on Community Level Physiological Profiling (CLPP)
… Scenedesmus obliquus varied significantly under autotrophic, heterotrophic and mixotrophic growth conditions. The concentration for 50% growth inhibition effect (EC50) of DTAC followed the order: autotrophic (0.48 ± 0.03 mg of DTAC/L) > heterotrophic (1.46 ± 0.04 mg of DTAC/L) > mixotrophic (2.11 …
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Estimating Nitrogen Fixation Rates, Importance, and Short-Term Efficiency in Small, Temperate Reservoirs Using Delta15N Techniques
… supply, 2) examine the effects of N2 fixation on autotrophic biomass accumulation and microcystin production, and 3) measure N2 fixation rates and importance to autotrophic N demand and zooplankton N assimilation. Results of the mesocosm experiment indicated that N2 fixation was increased at low …
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Modeling the Effects of Physical and Biogeochemical Processes on Phytoplankton Species and Carbon Production in the Equatorial Pacific Ocean
… a Tropical Atmosphere-Ocean (TAO) Array mooring. Autotrophic growth is represented by five algal groups, which have light and nutrient utilization characteristics of low-light adapted <em>Prochlorococcus</em>, highlight adapted <em>Prochlorococcus, Synechococcus</em>, autotrophic eukaryotes, and …
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Extension and verification of the PWM_SA model to incorporate SANI-specific bioprocesses using experimental data from the Hong Kong SANI saline sewage treatment pilot plant.
… PWM_SA model to incorporate sulfate reduction, autotrophic denitrification, and nitrification processes characteristic of the SANI system, focusing on achieving accurate mass balance across key chemical species and overall internal consistency. Specifically, the model extension aimed to ensure …
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Seaglider observations of biogeochemical variability in the Iberian upwelling system.
… these bloom events, NCP varied between (net autotrophic) values of 25 and 123 (±17 ) mmol m2. d1. Negative values of NCP were only observed twice for 24 and 60 hours respectively, with a maximum heterotrophy of 44 (±17) mmol m2 d1. Overall, the summer season featured a net autotrophic …
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Triple oxygen isotopes and oxygen/argon ratio measurements to enhance coastal and open ocean production/respiration comparisons
… 2010 at station L4. Annual N was positive (net autotrophic) at (0.88±0.24) mol m-2 a-1 O2. The triple oxygen isotope method overestimated G during winter months due to entrainment of waters from below the mixed layer. N of (3.8 ± 3.1) mmol m-2 a-1 O2 in the North Atlantic Gyre (NAG) and (2.9 ± …
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