Browsing by Subject "Selenium -- Physiological effect"
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Item Bioavailability of selenium from different meat assessed in selenium-deficient rats(Texas Tech University, 1995-05) Wen, Hong YuanNot availableItem Effects of Sel-Plex (organic selenium) and vitamin E on performance, immune response, and beef cut shelf life of feedlot steers(Texas Tech University, 2002-08) Clyburn, Bradley ScottSeveral experiments were designed to evaluate the differences of vitamin E level and selenium source on animal performance, selenium plasma concentrations, carcass characteristics, beef retail display, sensory characteristics, colostrum and milk components, and immunity in ruminants. Steers receiving Se yeast responded with an improvement in performance during the first 56 d, however, neither Se source nor vitamin E level affected performance over the entire 103 d experiment. Carcass quality measurements were similar among all treatments, however cattle supplemented with inorganic selenium and a moderate level of vitamin E responded with an increased loin-eye area. Lean muscle lightness of steaks aged 7, 14, and 35 d was improved with 50% less vitamin E when Se yeast was added to the diet. Steaks from steers fed no supplemental dietary Se or vitamin E, for all aging treatments, showed no difference in lean muscle lightness difference from the organic Se treatments with 125 lU and 500 lU of vitamin E nor the inorganic Se treatments at 35 d of aging. Neither selenium source nor vitamin E level influenced Warner Bratzler shear values. Selenium enriched yeast resulted in a greater Se colostrum concentration compared to inorganic Se and the control treatments, however, no differences were observed in milk Se concentration among treatments. Selenium yeast resulted in a greater colostrum Se concentration compared to inorganic Se and the control treatments, however, no differences were observed in milk Se concentration among treatments. Selenium source did not affect milk fat percentage between treatments. However, ewes supplemented with dietary inorganic Se showed a reduced colostrum (0 h) protein percentage compared to the control and the Se yeast treatments. Selenium source did not significantly affect milk lactose percentage among treatments. Additionally, non-fat solids percentage was reduced for all treatments after 6 h of lactation. Selenium source or supplementation had no affect on somatic cell count between treatments. Neither Se source nor supplementation affected ewe or lamb plasma Se or immunogloblin levels.Item In vitro cytotoxicity of selenium on a human mammary tumor cell line: and the effect of dietary selenium and magnesium on tumor growth in vivo(Texas Tech University, 1990-05) Yan, LinNot availableItem Selenium supplementation as a treatment for mild-moderate depression in the elderly(Texas Tech University, 2004-08) Tatum, Lela RuthPrior to the elucidation of selenium's role in the action of glutathione peroxidase in 1973, the majority of the research of the mineral involved the debilitative effects in its action as a pro-oxidant in ruminants. Since this time, most research has focused on the antioxidative capabilities of this mineral/enzyme. Minimal contributions of the role of selenium in the brain and nervous system have been presented in the scientific literature. Those studies which do attempt to establish a connection a benefit of selenium to healthy brain and nervous system functioning do so by examining the effects of nutrition as a whole in conditions and populations severely affected by neurological disease such as a Alzheimer's disease in the elderly. This dissertation examines the role of selenium on depression in the elderly. The subjects were randomly separated into two treatment groups examining two selenium compounds and a control group. The treatment period lasted a total of seven weeks and psychological measures in the form of the Beck Depression Inventory II (BDI-II) were given at the beginning and terminus of the study. Biological measures were made in the form of total plasma selenium concentration. With positive correlations, selenium compounds may be a cost-effective and safer treatment options for elderly people with mild to moderate depression.