selenium

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Related to Selenium compounds: Hydrogen selenide, Zinc compounds, Chromium compounds

se·le·ni·um

 (sĭ-lē′nē-əm)
n. Symbol Se
A nonmetallic element, red in powder form, black in vitreous form, and metallic gray in stable crystalline form, resembling sulfur and found as an impurity in pyrites or obtained as a byproduct of electrolytic copper refining. It is widely used in rectifiers, as a semiconductor, and in xerography. Its photovoltaic and photoconductive actions make it useful in photocells, photographic exposure meters, and solar cells. Atomic number 34; atomic weight 78.96; melting point (gray) 221°C; boiling point (gray) 685°C; specific gravity (gray) 4.79; (vitreous) 4.28; valence 2, 4, or 6. See Periodic Table.

[Greek selēnē, moon (from selas, light, brightness) + -ium.]

selenium

(sɪˈliːnɪəm)
n
(Elements & Compounds) a nonmetallic element that exists in several allotropic forms. It occurs free in volcanic areas and in sulphide ores, esp pyrite. The common form is a grey crystalline solid that is photoconductive, photovoltaic, and semiconducting: used in photocells, solar cells, and in xerography. Symbol: Se; atomic no: 34; atomic wt: 78.96; valency: –2, 4, or 6; relative density: 4.79 (grey); melting pt: 221°C (grey); boiling pt: 685°C (grey)
[C19: from New Latin, from Greek selēnē moon; named by analogy to tellurium (from Latin tellus earth)]

se•le•ni•um

(sɪˈli ni əm)

n.
a nonmetallic element occurring in several allotropic forms and having an electrical resistance that varies under the influence of light. Symbol: Se; at. wt.: 78.96; at. no.: 34; sp. gr.: (gray) 4.80 at 25°C, (red) 4.50 at 25°C.
[< New Latin (1818) < Greek selḗn(ē) moon + New Latin -ium -ium2]

se·le·ni·um

(sĭ-lē′nē-əm)
Symbol Se A nonmetallic element that can exist as a gray crystal, a red powder, or a black glassy material. It can convert light directly into electricity, and its ability to conduct electricity increases as light striking it becomes more intense. Because of this, selenium is used in copy machines, photography, and solar cells. Atomic number 34. See Periodic Table.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.selenium - a toxic nonmetallic element related to sulfur and telluriumselenium - a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite)
chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
fool's gold, iron pyrite, pyrite - a common mineral (iron disulfide) that has a pale yellow color
antioxidant - substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides
Translations
селен
selen
selen
seleen
seleeni
selenij
szelén
selen
セレン
seleenselenium
selen
selen
selen
selen
селен

selenium

[sɪˈliːnɪəm] Nselenio m

selenium

nSelen nt

selenium

n selenio
References in periodicals archive ?
Similar to curcumin, selenium compounds have shown anti-tumor and synergistic effect with radiation therapy.
However, toxic levels of selenium are difficult to establish since selenium toxicity is affected by the kind of selenium compounds present in the food as well as mutual interactions with other components of the diet [14-16].
Several studies have shown that certain selenium compounds, such as selenite and seleno-L-methionine, have roles as chemopreventive agents in different cancers, including prostate, melanoma, lung, esophageal and gastriccardia cancers (5-7).
Incubation period of 24 hrs for SeM and SeMSC was based on previous studies conducted by others to stimulate apoptosis using selenium compounds (Kim et al.
Estimating intestinal absorption of inorganic and organic selenium compounds by in vitro flux and biotransformation studies in Caco-2 cells and ICP-MS detection.
They cover selenium compounds as a source for selenoprotein biosynthesis, selenium compounds with specific functions, dual functions of selenoproteins in cancers, unexpected links, and selenoprotein polymorphisms and mutations.
Exposure of A549 Cells to Selenium Compounds. Subconfluent cultures were prepared in 12-well plates (Costar, Corning, USA), which were exposed to either SSe or SeMet at Se concentrations of 0.5, 1.5, and 3mM for 24 h.
Dialkyl selenides (selenoethers) are usually prepared from alkyl halides and [Se.sup.2-] species, generated from various selenium compounds. Since selenide ions are very unstable towards oxygen, they are generated in situ using different reducing agents.
Sayato, "Comparison of methylated selenium metabolites in rats after oral administration of various selenium compounds," Japanese Journal of Toxicology and Environmental Health, vol.
Garlic And A Concentrate Of Organic Selenium Compounds For Nutritional Supplementation," is valid until December 2026.