Topic
Selenium
About: Selenium is a research topic. Over the lifetime, 21192 publications have been published within this topic receiving 429715 citations. The topic is also known as: Se & selen.
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TL;DR: The results suggest a synergistic effect between the selenobacteria mixture and G. claroideum associated to major biodiversity and demonstrate a great potential of these rhizosphere microorganisms for biofortification of cereals and its derivates.
97 citations
TL;DR: In this paper, the variation of cell dimensions with composition departs only slightly from linearity: c shows a certain tendency to contraction (this corresponds to a smaller valency angle in the chains of atoms than is required by a linear variation): a varies much less (2 percent between Se and Te) and in a manner which depends upon the preparation of the alloy, as already observed for pure selenium by H. Krebs.
Abstract: Tellurium and metallic (hexagonal) selenium were shown to give solid solution in any concentration. The variation of the cell dimensions with composition departs only slightly from linearity: c shows a certain tendency to contraction (this corresponds to a smaller valency angle in the chains of atoms than is required by a linear variation): a varies much less (2 percent between Se and Te) and in a manner which depends upon the preparation of the alloy (as already observed for pure selenium by H. Krebs).The presence of sharp (hk·l) lines with l≠0 in all the alloys suggests that these must be composed not of homogeneous chains (i.e., Se chains, Te chains packed together), but of composite chains, in which the homogeneous sequences must be fairly short.
97 citations
TL;DR: In this article, the authors describe the results of experiments which provide a reasonable estimate of the global selenium budget, and demonstrate that significant concentrations of gaseous selenion species occur in surface ocean waters, and their production is closely linked to the gasaseous sulphur species turnover.
97 citations
TL;DR: Data support a protective effect of selenium against colorectal adenomas after adjustment for possible confounders, and suggest that Selenium might be a potentially useful chemopreventive agent for coloreCTal neoplasia.
Abstract: Previous research has suggested that selenium may protect against the development of colorectal neoplasia. We examined the potential chemopreventive properties of selenium against colorectal adenomas while controlling for a number of dietary and life-style factors. We conducted a cross-sectional study among patients referred for colonoscopy to University of North Carolina Hospitals. Cases had one or more pathologically confirmed adenomas, and noncases had none. Plasma selenium levels were determined using graphite furnace atomic absorption spectrometry with Zeeman background correction and platform technique. Odds ratios were calculated using logistic regression analysis adjusting for potential confounders. The mean plasma selenium concentrations for cases (n = 37) and noncases (n = 36) were 107 and 120 micrograms/l, respectively (p = 0.06). Those in the fourth quartile of plasma selenium level had 0.24 times the risk (95% confidence interval = 0.06-1.04) for colorectal adenomas of those in the first quartile. The adjusted odds ratio for colorectal adenomas was 0.58 (95% confidence interval = 0.31-1.08) for a 30 microgram/l increase in plasma selenium level. Lower plasma selenium levels were associated with multiple adenomas but not with adenoma size or location. These data support a protective effect of selenium against colorectal adenomas after adjustment for possible confounders. Selenium might be a potentially useful chemopreventive agent for colorectal neoplasia.
97 citations
97 citations