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 4002 for “"nutrient"”.
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Modeling nutrient requirements and measuring nutrient outputs of feedlot cattle
… have resulted in heavier carcass weights. Animal nutrient requirements are dynamic and the ability to accurately predict the requirements of modern, heavy cattle based on historic data has not been explored. A dataset derived from 19 studies containing 289 means for treatments testing ractopamine …
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Hypothalamic Nutrient Sensing
Nutrient sensing neurons are unique in coupling changes in the concentration of nutrients to changes in neuronal activity. These neurons typically exist in regions of the brain where the blood brain barrier is fenestrated, such as the arcuate nucleus of the hypothalamus. Glucose and leucine are …
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Nutrient Transport During Hypoperfusion
… functions, such as ion exchange, access to nutrients and energy production, and is believed to play a pathogenic role in both necrotizing enterocolitis (NEC) and nonocclusive small bowel necrosis (NOSBN). It is postulated that the detrimental effects of hypoperfusion are further compounded …
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Mechanisms of nutrient limitation and nutrient acquisition in managed and unmanaged forest ecosystems
… the results of several investigations into nutrient acquisition processes in the forests of New Hampshire. I begin with a meta-analysis of fertilization studies showing that phosphorus (P) and calcium (Ca) as well as nitrogen (N) may limit primary production in deciduous forests of the …
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Nutrient Loadings Into Conesus Lake
A nutrient loading study utilizing field measurements has not been performed on Conesus Lake tributaries since the construction of a perimeter sewer. The database from this study includes many parameters and is quite large. This report details the results of measurements for stream nutrient …
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Nutrient Intake of Marathon Runners
… to various standards of dietary quality. Nutrient intake by the runners exceeded two-thirds the Recommended Dietary Allowance for all nutrients except for vitamin D and zinc in female runners. Energy and nutrient intake levels in the marathon runners were higher than those of the general …
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Effective Modeling of Nutrient Losses and Nutrient Management Practices in an Agricultural and Urbanizing Watershed
… Manassas is experiencing eutrophication due to nutrient loads associated with agricultural activities and urban development in its drainage areas. Two watershed model applications using HSPF, and one receiving water quality model application using CE-QUAL-W2, were linked to simulate Lake …
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Reducing Nutrient Excretion via Improved Nutrient Utilization by Supplementing Pig and Poultry Diets with Phytase Enzyme
… the efficacy of phytase for improving the nutrient utilization for pigs and poultry. Two experiments, one with broilers and one with pigs, were conducted to compare the efficiency of transgenic microbial (Natuphosà ) and plant (Phytaseedà ) phytase for enhancing the utilization of phytate P …
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The controls of watershed nutrient export
… that the capacity of urban catchments to retain nutrients has declined. Impervious surfaces are likely a major factor leading to this decline.</p><p>Aquatic systems can store or denitrify a large amount of N, and can therefore potentially buffer increased N loading from terrestrial systems …
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Nutrient fluxes and soil microbial processes
… information on the impact of tree species on nutrient cycling, soil properties and microbial activities. In this study, six broadleaved species were growing at the same site with similar condition in terms of soil type, land use history and climate. Thus, the potential effects on …
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Nutrient intakes of primary school children
… The second phase assessed total daily food and nutrient intakes in a small sample of 20 children. All assessments were carried out over five consecutive days.ResultsThe food provided by the schools for lunch met the majority of the CWT nutritional guidelines, however children’s intake did not. …
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Intensification of Biological Nutrient Removal Processes
… footprint) all while providing the same level of nutrient removal as traditional methods. Shortcut nitrogen removal processes; including nitrite shunt, partial nitritation/anammox, and partial denitrification/anammox, as well as low-carbon biological phosphorus removal, were critically-evaluated …
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Nutrient intake of elderly hospital patients
… level completed, and sex of the person with the nutrient intakes of these patients. Three-day caloric and nutrient intakes were recorded and compared to the 1974 Reconmended Daily Allowances (RDA). Mean intake for a three-day period of seven nutrients showed patient averages met at least 100 …
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Development and analysis of the measured annual nutrient loads from agricultural environments (manage) drainage nutrient concentration database
… to understand the mechanisms responsible for nutrient transport from this land use leading to the eutrophication of surface waters and the hypoxic zone in the Gulf of Mexico. It is also vital to understand the effects of management practices in drained systems, as subsurface drains are …
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Nutrient dynamics in shallow tidally-dominated estuaries
… insight in the short temporal variability in nutrient concentrations, 24-hourly measurements of dissolved nutrients were conducted over four periods (winter, summer, start of spring, and end of spring) within one year in Te Puna and Waikareao estuaries. The nitrate and ammonium concentrations …
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Shear enhanced nutrient supply at the Mesoscale
… phytoplankton require a regular supply of nutrients to grow. In the open ocean such nutrients are abundant in the dark waters below the euphotic zone. Hence, to a large extent it is the physical mechanisms driving the transfer of nutrient rich water into the euphotic zone which dictate …
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