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Showing 1 to 20 of 314 for “"Selenium"”.
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The Marine Geochemistry of Selenium
… for the determination of Se (IV) and total selenium in natural waters has been developed and optimized. The detection limit is about 20 pM for both analyses using a one liter sample. The precisions were about 2 % at 338 pM for Se (IV) and at 234 pM for total selenium.</p> <p>The …
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Acute Selenium Toxicosis in Sheep
The toxicity, toxicokinetics, and progressive pathological changes produced by sodium selenite in sheep following parenteral administration were evaluated.
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Occurance of Selenium in Sedimentary Rocks
<p>The investigation of Selenium in Sedimentary Rocks was stimulated by Mr. Kohanowski who had two samples of sedimentary material that were believed to contain selenium.</p> <p>As not too much information is available or known about selenium minerals Mr. Kohanowski thought it would be educational …
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Selenium Effects on the Trabecular Meshwork
Epidemiological evidence indicates that selenium supplementation may increase risk for ocular hypertension and glaucoma. The purpose of this project was to determine the effects of selenium on the conventional "trabecular" aqueous outflow pathway, a likely site of pathology for glaucoma. Human …
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Selenium redox-catalyzed alkene syn-difunctionalization
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-08-01
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Dietary Selenium in Cultured Hybrid Striped Bass
… value of fish by increasing fillet levels of selenium (Se). In addition, various biomarkers of fish health (lysozyme, ceruloplasmin and glutathione peroxidase (GSH-Px) activities), were examined to determine whether dietary Se supplementation had a positive impact upon fish immunocompetence. …
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Isotopic studies of selenium in environmental samples.
Selenium has aroused much interest in the last decade. It is an essential trace element for man and animals and has been found to be the cofactor in two enzyme systems. The first, glutathionine peroxidase, acts as an anti-oxidant by destroying peroxides which attack cellular membranes. The second, …
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Lycopene, Selenium, Vitamin E and Prostate Cancer
… the effects of dietary lycopene (250 ppm), selenium (Se-methylselenocysteine, 2 ppm), and vitamin E (gamma-tocopherol, 200 ppm) alone, and in combination, on the growth of androgen-dependent Dunning R3327-H rat prostate adenocarcinomas. AIN-93G diets containing these micronutrients were …
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Role of selenium in neonatal lung development
… were conducted to assess the role of dietary selenium (Se) in development of neonatal lungs under normoxia and hyperoxia. Lung development was assessed by measuring certain parameters of functional and structural development, including pulmonary phospholipids and histomorphometry. Lung lesions …
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Interplay between selenium hyperaccumulator plants and their microbiome
… that hyperaccumulate (HA) toxic elements such as selenium (Se). Selenium HAs may contain up to 1.5% of their dry weight in Se, which can cause toxicity to herbivores and pathogens as well as neighboring plants. Many advances are yet to be made with regard to the interaction of Se and the plant …
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Sorption and desorption of selenium in cement formulations
… evaluated for their ability to effectively sorb selenium at three pH levels (5.9, 8.7, 12.4). A Type V Portland cement was utilized. Distribution coefficients (K{dollar}\sb{\rm d}{dollar} values) determined for each cement formulation ranged from 250-1600 L kg{dollar}\sp{-1}{dollar}. Findings …
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Isotopes of selenium as redox tracers of geochemical processes influencing the export and behavior of selenium contamination in coal mine watersheds
Selenium is a redox-active element that is necessary for life in small quantities but causes toxic effects for wildlife above 5 μg/L in water and for humans above 50 μg/L in drinking water. Se contamination is released by oxidative weathering of Se-bearing shales, and this contamination is often …
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Arsenic and Selenium Distribution in Coal-Fired Plant Samples
Arsenic and selenium distributions in coal-fired plant samples are studied. This research includes arsenic and selenium concentrations in samples of coal, fly ash, bottom ash, economizer ash, Flue Gas Desulfurization (FGD) slurry and flue gas taken from four power plants with the goal being to …
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Modeling Arsenic, Antimony, And Selenium Partitioning During Coal Combustion
… bound." Specific elements-arsenic, antimony, and selenium-are of particular interest due to their semi-volatile nature.</p> <p>Modeling the partitioning of semi-volatile elements-arsenic, antimony, and selenium-is the focus of this undertaking. Programming was done in C++ with …
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Mechanism Studies on the Selenium-Dioxide Oxidation of Ketones
Made available in DSpace on 2014-12-05T19:37:02Z (GMT). No. of bitstreams: 1 5900571.pdf: 2325871 bytes, checksum: 3a693065a6ad16516471846d8b70f719 (MD5) Previous issue date: 1958
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Void formation in copper and selenium ion irradiated molybdenum.
Thesis: M.S., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 1978
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