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 ?
The EOM 0.1 treatment changed the fold change of Selenomonas ruminantium (p<0.001) Fibrobacter succinogenes (p = 0.047), and Ruminococcus albus (p = 0.005) in a quadratic manner (Table 3).
Weimer, Stevenson, Mertens, and Thomas (2008) suggested that MON in highstarch diets does not suppress thegram-negative ruminal populations (Succinivibrio dextrinisolvens, Ruminobacter amylophilus and Selenomonas ruminantium), and based on this fact, the linear increase on apparent digestibility of starch on finishing period (Table 3) may be due to the linear decrease of DMI (Table 3).
Por otro lado, en el tracto digestivo se obtuvo Helicobacter rappini y Campylobacter coli con mayor abundancia en el estomago, Selenomonas bovis y Lactobacillus ultunensis en el intestino delgado y Lactobacillus ultunensis y Prevotella copri en el recto (heces) (Cuadro 2).
The Succinimonas, Streptococcus, Pseudobutyrivibrio, Succiniclasticum and Selenomonas can only be found in C1 and C2.
amyloliquefaciens, Lactobacillus amylovorus, Selenomonas ruminantium, Klebsiella pneumonia, K.
Las bacterias lipoliticas, asi como Selenomonas ruminantium y Selonomonas dextrinosolvens son los grupos de mayor participacion en la fermentacion del glicerol, produciendo ademas metabolitos diferentes a los tres principales acidos grasos volatiles (acetico, propionico y butirico), tales como, succinico, lactico, C[O.sub.2] y C[H.sub.4] (Hobson y Mann 1961; Czerkawski y Breckenridge, 1972; Trabue et al, 2007; Krehbiel, 2008; Abo et al., 2010).
These genera were Atopobium, Beggiatoa, Burkholderia, Collinsella, Comamonas, Finegoldia, Fusobacterium, Gemella, Listeria, Methanobrevibacter, Parvimonas, Peptoniphilus, Peptostreptococcus, Porphyromonas, Selenomonas, Shuttleworthia, Solobacterium, Thermoanaerobacter, Verrucomicrobiales, and Yersinia.
faecalis Actinomyces odontolyticus Filifactor alocis Actinomyces viscosus Finegoldia magna Propionibacterium acnes Parvimonas micra Propionibacterium propionicum Peptoniphilus asaccharolyticus Slackia exigua Peptostreptococcus anaerobius Pseudoramibacter alactolyticus Selenomonas sputigena Streptococcus anginosus Streptococcus constellatus Streptococcus intermedius Streptococcus mitis Streptococcus sanguis Veillonella parvulla Firmicutes Proteobacteria Spirochaetes Dialister pneumosintes Campylobacter Treponema gracilis amylovorum Dialister invisus Campylobacter Treponema.
Relative abundance (%) p value Genus Group A Group B Group C (KW) * Prevotella 11.37 17.74 33.60 0.05 Bacillus 8.81 2.42 0.12 0.04# Porphyromonas 4.40 2.74 3.05 0.4 Streptococcus 1.05 7.94 0.60 0.004# Bacteroides 4.75 1.31 3.27 0.04# Veillonella 0.70 7.75 0.38 0.002# Atopobium 2.58 1.67 7.63 0.12 Staphylococcus 4.61 1.35 0.04 0.04# Candidatus Tammella 3.35 0.69 2.50 0.02# Fusobacterium 0.93 2.17 4.69 0.04# Pyramidobacter 0.06 1.22 7.71 0.3 Lactobacillus 0.61 3.76 0.04 0.08 Selenomonas 1.39 2.05 1.33 0.5 Leptotrichia 0.31 3.90 0.03 0.002# Oribacterium 2.15 0.41 2.23 0.08 Filifactor 2.19 0.55 1.47 0.04# Dialister 0.73 0.29 5.85 0.03# Alkaliphilus 2.10 0.23 1.53 0.004# Treponema 2.10 0.58 0.50 0.02# Rothia 0.16 3.12 0.12 0.1 Note: Statistically significant (p < 0.05) are indicated with #.
In particular, the microbial alterations in pancreatic cancer regarded an increase in several pathogens, such as Veillonella, Klebsiella, and Selenomonas, and LPS-producing bacteria including Prevotella, Hallella, and Enterobacter, and a related decrease in several commensals, such as Bifidobacterium, and some butyrate-producing bacteria, such as Coprococcus, Clostridium IV, Blautia, Flavonifractor, and Anaerostipes [139].
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., 2013).
Estas enzimas tienen como cofactores iones metalicos y fueron encontradas en bacterias anaerobicas como Selenomonas ruminantium del rumen, y de acuerdo con su mecanismo catalitico se sugiere que presentan la secuencia conservada de HCXX-GXXR (T/S) en su sitio activo.