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Biochimica et Biophysica Acta (BBA) - General Subjects, 2018
Selenium (Se) is not an essential element for plants, although it can benefit their growth and survival in some envionments. Excess tissue Se concentrations are toxic. The ability to sequester Se in vacuoles, synthesise non-toxic Se metabolites, or volatilise Se compounds determines maximum tissue Se concentrations and the ability to colonise ...
Philip John White
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Selenium (Se) is not an essential element for plants, although it can benefit their growth and survival in some envionments. Excess tissue Se concentrations are toxic. The ability to sequester Se in vacuoles, synthesise non-toxic Se metabolites, or volatilise Se compounds determines maximum tissue Se concentrations and the ability to colonise ...
Philip John White
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Regulation of Selenium Metabolism and Transport
Annual Review of Nutrition, 2015Selenium is regulated in the body to maintain vital selenoproteins and to avoid toxicity. When selenium is limiting, cells utilize it to synthesize the selenoproteins most important to them, creating a selenoprotein hierarchy in the cell. The liver is the central organ for selenium regulation and produces excretory selenium forms to regulate whole-body
Raymond F, Burk, Kristina E, Hill
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Metabolism of selenium in a selenium-dependent bacterium
Biological Trace Element Research, 1990A selenium-dependent Bacillus sp. is able to grow well up to 3% sodium selenite-containing media. The bacterium completely failed to grow on media devoid of selenium. The presence of selenium in the growth media increased the bacterial contents of proteins, carbohydrates, and lipids.
A A, Razak, S E, Ramadan, K, el-Zawahry
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Selenium metabolism in Escherichia coli
Biometals, 1998Escherichia coli will reduce selenite (SeO3(2-)) and selenate (SeO4(2-)) to elemental selenium Se0. Selenium will also become incorporated into proteins as part of the amino acids selenocysteine or selenomethionine. The reaction of selenite with glutathione produces selenodiglutathione (GS-Se-GS).
R J, Turner, J H, Weiner, D E, Taylor
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Selenium metabolism and bioavailability
Biological Trace Element Research, 1996Selenium (Se) is at once an essential and toxic nutrient that occurs in both inorganic and organic forms. The biological functions of Se are mediated through at least 13 selenoproteins that contain Se as selenocysteine (Se-cyst). The endogenous synthesis of this amino acid from inorganic Se (selenide Se-2) and serine is encoded by a stop codon UGA in ...
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Selenium Metabolism in Micro-organisms
1993Publisher Summary Selenium is one of the youngest elements detected to have a biological function. The form used in biological macromolecules (proteins, tRNAs), however, is the -2 oxidation state. Nature has used the chemical property of the selenol group to incorporate it into the active site of oxidoreductases.
J, Heider, A, Böck
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Clinical aspects of selenium metabolism
Biological Trace Element Research, 1988Whereas defined selenium deficiency diseases are well characterized in animals, analogous syndromes in humans are unknown or occur only rarely under conditions of extreme selenium depletion. However, selenium deficiency has since been recognized to play important secondary roles in a variety of human diseases, and several of these can be prevented or ...
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2010
Selenium (Se) is an essential nutrient for many organisms, but also toxic at higher levels. While certain algae require Se to make selenoproteins, no such requirement has been shown for higher plants. Still, plants readily take up and assimilate Se using sulfur (S) transporters and biochemical pathways, and can also volatilize methylated Se.
Elizabeth A. H. Pilon-Smits +1 more
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Selenium (Se) is an essential nutrient for many organisms, but also toxic at higher levels. While certain algae require Se to make selenoproteins, no such requirement has been shown for higher plants. Still, plants readily take up and assimilate Se using sulfur (S) transporters and biochemical pathways, and can also volatilize methylated Se.
Elizabeth A. H. Pilon-Smits +1 more
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Arsenic and Selenium in Microbial Metabolism
Annual Review of Microbiology, 2006Arsenic and selenium are readily metabolized by prokaryotes, participating in a full range of metabolic functions including assimilation, methylation, detoxification, and anaerobic respiration. Arsenic speciation and mobility is affected by microbes through oxidation/reduction reactions as part of resistance and respiratory processes. A robust arsenic
John F, Stolz +3 more
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Selenium metabolism in a strain ofFusarium
Biological Trace Element Research, 1988Fusarium sp. was isolated from Sinai soil at Egypt. It showed tendency to tolerate high concentrations of selenium in the form of sodium selenite up to 3.5% (w/v). The microscopic examination revealed some morphological distortions. However, the fungus was capable to circumvent the toxic effect of selenium. The fungus possess strong reducing ability as
S E, Ramadan +3 more
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