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 109 for “"inorganic nitrogen"”.
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Influence of surface chemistry of carbon materials on inorganic nitrogen contaminants chemisorption
Adsorption of inorganic nitrogen contaminants (INC), namely ammonium (NH4 +), nitrate (NO3-), and nitrite (NO2-), using carbon materials (CMs) such as activated carbon (AC), and biochar (BC) has been widely implemented. This study was based on the hypothesis that surface chemical properties of CMs …
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Effects of atrizine on the assimilation of inorganic nitrogen compounds in plants and microorganisms
xx, 65 leaves : graphs ; 30 cm.
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Corn Production, Inorganic Nitrogen Distribution, and Soil Chemical Transformations Associated With Liquid Beef Manure Application Methods
Despite being a popular application method, many producers reported crop growth and production problems when liquid manure was knife injected into soil. Field and laboratory studies were conducted to determine the effects of liquid beef manure application methods and nitrification inhibitors on …
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The effect of organic carbon and nitrogen additions on inorganic nitrogen uptake by phytoplankton and bacteria
… effects of enrichment with organic carbon and nitrogen on inorganic nitrogen partitioning between phyto- and bacterio- plankton. Strongly preferential uptake of ammonium over nitrate was observed by both the phytoplanktonic and bacterial fractions, with RPINH4 values typically between 1 and 5. …
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Legacy effects of cover crop monocultures and mixtures on soil inorganic nitrogen, total phenolic content, and microbial communities on two organic farms in Illinois
… on their soil environments by influencing soil inorganic nitrogen (N) pools, total phenolic content through the release of secondary compounds, and by altering soil microbial communities. I analyzed soils collected during a two-year field study and aimed to determine how spring-sown cover crops …
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Relationships of Watershed Climate and Geochemical Processes to Trophic Characteristics in Texas Reservoirs
… green algae. Central reservoirs were highest in inorganic nitrogen. West reservoirs ranked lowest in inorganic nitrogen and highest in cyanobacteria. Morphometry, hydrology, and human impacts vary among individual reservoirs, but comparisons indicated that differences in these factors between …
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Urea as an Effective Nitrogen Source for Cyanobacteria
… with urea now accounting for > 50% of nitrogen fertilizer applications worldwide. The shift from inorganic nitrogen fertilizers to urea-based sources has coincided with the reappearance of cyanobacteria blooms in freshwaters. Here, we examined urea as a nitrogen source for three …
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Water Column Ammonium Concentration and Salinity Influence Nitrogen Uptake and Growth of Spartina Alterniflora
… role in uptake and transformation of inorganic nitrogen before it reaches coastal waters, thereby reducing the potential for eutrophication. Although nitrogen availability typically limits <em>S. alterniflora </em>growth, it may be possible to exceed the nitrogen uptake capacity of …
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Limnological investigations of a natural, subalpine lake in the early stages of eutrophication: Mountain Lake, Giles County, Virginia
… lake mean annual orthophosphate-phosphorus and inorganic nitrogen increases have occurred over the past decade, although primary productivity, cell densities, and chlorophyll a values indicate no consistent trends. Hypolimnetic oxygen deficits, however, have continued to increase over time, and …
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Microbial responses to plant functional types and historical resources additions in the shortgrass steppe
… types (PFT) through influence on the levels of inorganic nitrogen (N) and labile carbon in the rhizosphere. This is particularly important in the shortgrass steppe (SGS), where plants with the C3 or C4 photosynthetic pathway differ in phenology, which affects the timing of maximum N uptake and …
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Modelling Stream Metabolism and Fish Biomass in Headwater Streams of the Eastern Cascades Mountains
… active radiation and dissolved inorganic nitrogen, and the air water gas-exchange estimations were likely inaccurate. Metabolism metrics and trout biomass did not relate with photosynthetically active radiation, dissolved inorganic nitrogen, soluble reactive phosphorus, dissolved …
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Ammonia uptake by phytoplankton and limnological studies of Mountain Lake, Virginia
… natural lake is undergoing change. Whereas inorganic nitrogen, orthophosphate, Secchi disc transparency, and primary productivity continue to suggest an oligotrophic condition, important limnological changes are indicated by the greater seasonal hypolimnetic oxygen depletion and extractable …
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Weak acid/bases and pH control in upflow anaerobic sludge bed reactors
… performance of systems with high levels of inorganic nitrogen. With high levels of inorganic nitrogen generated in the reactor liquid due to deamination the likelihood increases of inhibitory effects developing due to increased ammonia (NH₃) levels at higher than neutral pH values. It was of …
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Soil carbon and nitrogen cycle modeling for bioenergy crops
… the expansion of these crops on soil carbon and nitrogen dynamics is integral to understanding their long-term environmental impacts. We developed a coupled hydrological-soil nutrient model under identical field conditions and different harvest litter input scenarios. Our project simulation shows …
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Pilot Scale Application of Partial Nitritation Anammox and Partial Denitrification Anammox Treating Industrial Fertilizer Waste with High Ammonia and Nitrate
… a waste stream that is very laden with total inorganic nitrogen (TIN), ammonium (NH4), nitrite (NO2), and nitrate (NO3) – which is the main component of the wastewater that is regulated. Conventional approaches to removing high concentrations of inorganic nitrogen from wastewater are very …
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Urea and nickel utilization in marine cyanobacteria as evaluated by incubation, proteomic, and uptake techniques
Nitrogen and trace metal biogeochemical effects on phytoplankton productivity were compared through whole water bottle incubations and proteomic evaluation of in situ harvested particulate matter from two distinct oceanographic regions: the Equatorial Pacific Upwelling and the South Pacific Gyre. …
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Measuring and modeling suspended sediment and nutrient yields in a mixed-land use watershed of the central United States
… to 313.0 t km-2 yr -1 during 2010. Annual total inorganic nitrogen and total phosphorus yields exceeded 10.3 and 2.04 kg ha-1 yr -1 from the agricultural dominated headwaters. Multiple linear regression analyses indicated significant (CI = 0.05) relationships between pollutant loading, annual …
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An 15N study of the effects of nitrate, ammonium, and nitrate + ammonium nutrition on nitrogen assimilation in Zea Mays L.
… on the effects of nitrate and ammonium nitrogen sources on plant growth, and the assimilation of those nitrogen sources, has been presented. A water culture technique for the growth of maize was developed. The use of a gravel rooting medium with nutrients recycling through the rooting …
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Urea and nickel utilization in marine cyanobacteria as evaluated by incubation, proteomic, and uptake techniques
Nitrogen and trace metal biogeochemical effects on phytoplankton productivity were compared through whole water bottle incubations and proteomic evaluation of in situ harvested particulate matter from two distinct oceanographic regions: the Equatorial Pacific Upwelling and the South Pacific Gyre. …
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