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Selenium is a component of the amino acids selenocysteine and selenomethionine. In humans, selenium is a trace element nutrient that functions as cofactor for glutathione peroxidases and certain forms of thioredoxin reductase. [1] Selenium-containing proteins are produced from inorganic selenium via the intermediacy of selenophosphate (PSeO 3 3 ...
In living systems, selenium is found in the amino acids selenomethionine, selenocysteine, and methylselenocysteine. In these compounds, selenium plays a role analogous to that of sulfur. Another naturally occurring organoselenium compound is dimethyl selenide. [57] [58] Certain soils are selenium-rich, and selenium can be bioconcentrated by ...
In the selenium cycle it has been found that bacteria, fungi, and plants, especially species of Astragalus, metabolize the most oxidized forms of selenium, selenate or selenite, to selenide. It is also thought that microorganisms may be able to oxidize selenium of valence zero to selenium of valence +6.
Among these compounds, selenium has various oxidation states, the most common ones being −2, +4, and +6. Selenium compounds exist in nature in the form of various minerals, such as clausthalite, guanajuatite, tiemannite, crookesite etc., and can also coexist with sulfide minerals such as pyrite and chalcopyrite. [1]
Selenium concentrations at these locations were found to be greater than 1400 micrograms per liter. Mosquito fish samples from 1982 showed that fish from the Kesterson Reservoir contained selenium concentrations more than 70 times higher than fish sampled from a nearby reference site.
Equipped with only 19 pounds of gear, 89-year-old Bing Olbum set off on what he intended to be a five-day hiking trip.. Instead, Olbum found himself stranded for nearly 10 days in over 4 million ...
Police said a woman who was found in a remote Australian mountain range after going missing for almost two weeks was "dazed and unwell" but alive after suffering a snake bite in remote wilderness.
A 48-year-old woman has been found alive in the remote alpine wilderness of southeastern Australia, where she went missing earlier this month.