selenium

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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 ?
Tajima et al [48] designed 12 primer sets specific for culturable ruminal bacterial species that include Fibrobacter succinogenes, Ruminococcus flavefaciens, Ruminococcus albus, Prevotella ruminicola, Prevotella albensis, Prevotella bryantii, Selenomonas ruminantium-Mitsuokella multiacida, Streptococcus bovis, Eubacterium ruminantium, Treponema bryantii, Succinivibrio dextrinosolvens, and Anaerovibrio lipolytica.
Glycerol is metabolized by Megasphaera elsdenii, Streptococcus bovis, and Selenomonas ruminantium (Stewart, Flint, & Bryant, 1997), and Megasphaera elsdenii has been associated with increases in butyric acid in ruminal fluid (Hales et al.
Although the optimum temperature for phytase activity of Selenomonas ruminantium JY35, an anaerobic rumen bacterium, is also 55[degrees]C, the enzyme activity declines dramatically at 60[degrees]C (15).
1996) mention that SC1077 can prevent a decrease of pH in the rumen from a lower production of lactic acid due to the increase of rumen microorganisms, especially Megasphaera elsdenii or Selenomonas ruminatum which use lactate as an energy source.
10) Entre las bacterias identificadas, se encuentran Selenomonas, Neisseria, una variedad de especies de Streptococcus, Bifidobacterium, Propionibacterium, Scardoviawiggsiae, Veillonella parvula, Veillonella atypica, Megasphaera micronuciformis, Fusobacterium periodontium, Achromobacterxylosoxidans y Actinomycesgerensceriae.
Teniendo en cuenta los resultados de los estudios previos, Casarin y colaboradores (38) compararon la microbiota subgingival de los pacientes diabeticos y no diabeticos con periodontitis en una poblacion brasilera y encontraron diferencias significativas entre los grupos, donde los generos Aggregatibacter, Neisseria, Gemella, Eikenella, Selenomonas, Actinomyces, Capnocytophaga, Fusobacterium, Veillonella y Streptococcus fueron mas frecuentes en los pacientes diabeticos mientras que hubo bajos porcentajes de los generos Porphyromonas, Filifactor, Eubacterium, Synergistetes, Tannerella y Treponema.
2] y formato (Lachnospira multiparus, Ruminococcus albus y Ruminococcus flavefaciens), de butirato (Butyrivibrio fibrisolvens, Eubacterium cellulosolvens y Eubacterium rumininantium), de lactato (Lactobacillus ruminis, Lactobacillus vitulinus y Streptococcus bovis) y de amoniaco (Clostridium aminophilum, Clostridium sticklandii y Peptostreptococcus anaerobius) son susceptibles a los ionoforos, mientras que bacterias productoras de succinato y propionato (Anaerovibrio lipolytica, Fibrobacter succinogenes, Megasphaera elsdenii, Prevotella ruminicola, Selenomonas ruminantium, Succinimonas amylolytica y Succinivibrio dextrinosolvens) son resistentes (62).
La bacteria ruminal Selenomonas ruminantium fue crecida en un medio de infusion de cerebro-corazon (BHI) mas 500 g de cisterna m[L.
Isolation and characteristics of a ureolytic strain of Selenomonas ruminantum.
buccalis, Prevotella melaninogenica, and Selenomonas noxia in individuals in the C group than in those in the CKD group (p < 0.
Otros, Fusobacterium nucleatum, Campylobacter spp Eikenella corrrodens, Selenomonas Peptostreptococcus spp.
The main pathways of the decorboxylation of that type of phenolics occur in the rumen and some ruminal bacteria, such as Selenomonas sp.