Selenium compounds

selenium /se·le·ni·um/ (sĕ-le´ne-um) a chemical element, at. no. 34, symbol Se; it is an essential mineral nutrient, being a constituent of the enzyme glutathione peroxidase.

selenium sulfide a topical antiseborrheic and antifungal, used in the treatment of seborrheic dermatitis and dandruff of the scalp and of tinea versicolor.

se·le·ni·um (s

-l

n. Symbol Se

A nonmetallic essential trace element used in its disulfide form as an antiseborrheic and as a radioisotope to image the pancreas and parathyroid glands. Atomic number 34.

selenium (Se)

[silē′nē·əm]

Etymology: Gk, selene, moon

a metalloid element of the sulfur group. Its atomic number is 34, and its atomic mass is 78.96. Selenium occurs mainly in iron, copper, lead, and nickel ores in the form of metallic selenides. One of the chief commercial sources is the flue dust produced by the burning of pyrites to make sulfuric acid. Selenium occurs as a trace element in foods, and research continues to determine the most effective daily allowances for different age groups. Dietary experts say that the estimated safe, adequate intake of selenium for infants 6 months of age is 0.04 mg, for adults 0.05 to 0.2 mg. Although selenium deficiency can result in liver problems and degeneration of muscles in some animals, in humans its need has not yet been clearly defined. The bright orange insoluble powder selenium sulfide is used externally in the control of seborrheic dermatitis, dandruff, and other forms of dermatosis. Selenium sulfide, used as a lotion, is used in some therapeutic shampoos as 2.5% of selenium sulfide in a detergent vehicle; it is sold without prescription as a 1% detergent suspension in a scented detergent vehicle. Adverse effects may include conjunctivitis if the preparation enters the eyes, increased oiliness or dryness of the hair, and orange tinting of gray hair. The antidandruff effectiveness of selenium sulfide is thought to stem from its antimitotic activity and its residual adherence to the hair after shampooing. Normal skin absorbs very little of the drug, but inflamed or damaged skin absorbs it readily. Selenium is used in the nuclear medicine compound selenomethionine for diagnosing parathyroid tumors. The element is also used as a photoconductive layer of xeroradiographic plates. Burns and dermatitis venenata may result from prolonged skin contact.

selenium [sĕ-le´ne-um]

a chemical element, atomic number 34, atomic weight 78.96, symbol Se. (See Appendix 6.) It is an essential mineral nutrient. Dietary sources of selenium include seafoods, kidney, and liver. Humans can adjust their homeostasis mechanism for selenium over a wide range of dietary intakes. Recommended intake levels are generally met from the diet, so that supplements are not necessary.

selenium sulfide

1. the sulfide salt of selenium, a topical antiseborrheic and antifungal applied topically to the scalp to control seborrheic dermatitis and dandruff; also used topically in the treatment of tinea versicolor.

2. the sulfide salt of selenium, an antiseborrheic and antifungal; used topically in the treatment of seborrheic dermatitis and dandruff of the scalp and of tinea versicolor.

selenium (s

·lēˑ·nē·

m),

n an essential element/mineral found in most vegetables, breads, and meats. Has been used in AIDS, asthma, car-diovascular conditions, cataracts, cervical dysplasia, multiple sclerosis, osteoarthritis, and rheumatism. No known precautions, but selenium supplementation is toxic at daily doses greater than 750 μg.

selenium (Se) (s

lē´nēum),

n a trace element used in the treatment of seborrhea and dandruff of the scalp. Selenium is toxic in large amounts.

Selenomonas

n a genus of gram-negative, anaerobic, rod-shaped bacteria found in the oral cavity.

selenium

a chemical element, atomic number 34, atomic weight 78.96, symbol Se. See Table 6. It is an essential mineral nutrient and a very potent poison.

selenium-75

a radioisotope of selenium having a half-life of 120 days and a principal gamma ray photon energy of 265 keV; used in the radiopharmaceutical selenomethionine. Symbol ⁷⁵Se.

selenium accumulator plants

see accumulator plants.

selenium converter plants

see converter plants.

selenium indicator plants

see indicator plants.

selenium-induced infection resistance

selenium deficiency in the diet may increase the patient's susceptibility to infection.

selenium nutritional deficiency

there are well-defined deficiency and poorly defined selenium responsive diseases. A nutritional deficiency of vitamin E has many of the same effects of selenium deficiency and it is often difficult to separate the two. See also enzootic muscular dystrophy, mulberry heart disease, hepatosis dietetica, iron poisoning, weaner illthrift.

selenium poisoning

can occur on pasture growing on selenium rich soil, especially if there are selenium indicator plants growing in it. Also when selenium supplementation is carried out carelessly and there is accidental access to poisonous amounts. Acute poisoning features diarrhea, dyspnea and death. Subacute poisoning is hallmarked by blind staggers (see dummy). Chronic poisoning produces a syndrome of stiff gait, loss of haircoat and separation, perhaps sloughing, of the hooves. Called also alkali disease.

Coronary separation caused by selenium poisoning. By permission from Knottenbelt DC, Pascoe RR, Diseases and Disorders of the Horse, Saunders, 2003

selenium-responsive diseases

diseases such as reproductive inefficiency and illthrift in sheep and cattle respond in some situations to dietary supplementation with selenium but the diseases are not proven to be caused by nutritional deficiency of the element.

selenium sulfide, selenium disulfide

a commonly used keratolytic in medicated shampoos employed in the treatment of skin disease in dogs and cats.

selenium weed

see neptunia amplexicaulis.

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ACES alkali disease astragalus Atriplex Brazil Nut Castilleja Greyia brandegei Keshan Disease methylselenocysteine mineral deficiency Mineral Toxicity Minerals Neptunia amplexicaulis Se SELECT seleniferous selenious acid selenium deficiency selenium intoxication			Other studies published in the journals Carcinogenesis and Cancer Prevention Research have explored the role of organic selenium compounds in killing human prostate and colon cancer cells. Natural compounds in vegetables may make chemotherapy more effective by Asian News International About 40% to 50% of the selenium compounds in high-selenium yeast have not been identified, and it is possible that some of these compounds have greater anticancer activity than does selenomethionine. Literature review & commentary by Gaby, Alan R. / Townsend Letter The content of other organic selenium compounds, including selenocysteine, does not exceed 10%. Selenium yeast: the preferred mineral source by Jensen, Nicolai / Nutraceutical Business & Technology			Selective Intervention selective mutism selective neck dissection selective neuronal necrosis selective photothermolysis selective reduction selective serotonin reuptake inhibitor Selective serotonin reuptake inhibitors Selective serotonin uptake inhibitors selective stain selective termination of pregnancy selectively permeable selectivity selectivity coefficient selectivity, sensory Selector aspirator selector plant selegiline selegiline HCl selegiline hydrochloride Selenicereus grandiflorus seleniferous selenious acid selenite broth selenium Selenium compounds selenium deficiency selenium intoxication selenium sulfide seleno-DL-methionine selenocompounds selenodont selenoid cells Selenomonas ruminantium Selenophobia selenosis self Self Abuse Self Bougienage self care Self Destructive Behaviour Self Extinguishing Cigarette Self Fulfilling Prophecy Self Harm self help Self Help Group Self Induced Illness Self Killer Self Pay Self Policing Self Treatment Movement			Selenipediinae Selenipedium selenite selenite Selenite broth selenite butte selenites selenites Selenitic selenitic cement selenitic lime selenium selenium selenium selenium selenium selenium accumulator plants selenium accumulator plants selenium accumulator plants Selenium and Vitamin E Cancer Prevention Trial Selenium and Vitamin E Cancer Prevention Trial Selenium and Vitamin E Cancer Prevention Trial Selenium and Vitamin E Cancer Prevention Trial Selenium and Vitamin E Cancer Prevention Trial selenium bromide selenium cell selenium cell selenium cells selenium cells Selenium Compound, Organic Selenium compounds selenium converter plants selenium converter plants selenium converter plants selenium deficiency selenium dibromide selenium diode Selenium dioxide selenium disulfide selenium halide selenium indicator plants selenium indicator plants selenium indicator plants selenium intoxication selenium monobromide selenium nitride selenium nutritional deficiency selenium nutritional deficiency selenium nutritional deficiency Selenium oxide selenium poisoning selenium poisoning selenium poisoning selenium rectifier selenium stainless steel Selenium sulfide Selenium sulfide Selenium sulfide selenium sulfide, selenium disulfide selenium sulfide, selenium disulfide selenium sulfide, selenium disulfide

selenium (redirected from Selenium compounds)

selenium
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