Selenium in certain soils ma y be taken up by plants in amounts sufficient to make forage toxic to animals. Seieniterous torage can be found in semiarid areas on soils t ypicall y derived from Cretaceous geologic material in the Western United States and Canada. Intoxication or iivestock b y seieniterous p lants nas been ciassiried as acute or cnronic. Acute :-,oisoning results from consumin g ...

To investigate whether selenium (Se) accumulation in plants provides a chemical defense against generalist insect herbivores, the feeding preference and performance of a mix of orthopteran species were investigated. The selenium hyperaccumulator Stanleya pinnata and accumulator Brassica juncea were used in herbivory studies in the laboratory, and S. pinnata was also used in a manipulative field...

The bioconversion of selenium in the form sodium selenite (Na2 SeO3 ) (SeIV) or selenate SeO4 (SeVI) to organic by Lactobacillus casei (L. casei) was investigated vitro. MRS media supplemented with 1, 2, 5, 10 20 ppm Se, inoculated 2% starter culture about 105 cfu/ ml L. and then incubated up 24 hrs at 37o C. Increasing “Se(IV)” concentrations markedly reduced bacterial growth compared “Se(VI)”...

Ascorbic acid and selenium are two nutrients that seem to have a preventive potential in the process of carcinogenesis; because of a possible synergistic action that may produce an enhanced anticarcinogenic effect. Interaction between these nutrients have been reported. Results indicate that the protective effect of the inorganic form of selenium (Na Selenite) was nullified by ascorbic acid, wh...

Organic selenium compounds are known to prevent certain cancers although mechanisms may be complex. A widely-held view is that selenium compounds can induce apoptosis in cancer cells, or more precisely, in aberrant cells that are undergoing clonal evolution somewhere along the carcinogenesis process. There are at least 20 different selenium compounds, inorganic as well as organic, that have bee...

The aim of this review is to present and evaluate the present knowledge of which selenium species are available to the general population in the form of food and common supplements and how these species are metabolized in mammals. The overview of the selenium sources takes a horizontal approach, which encompasses identification of new metabolites in yeast and food of plant and animal origin, wh...

Surface diffusion is important for a broad range of chemical and physical processes that take place at the surfaces amorphous solids, including surface crystallization. In this work, temporal evolution nanoholes monitored with atomic force microscopy to quantify dynamics selenium. molecular glasses, coefficient has been shown scale crystal growth rate (us) according power relation us ≈ Ds0.87. ...