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Topic: Selenium

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In the News (Mon 17 Jun 19)

  Selenium - Wikipedia, the free encyclopedia
Selenium also occurs in organic compounds such as dimethyl selenide, selenomethionine and selenocysteine, all of which have high bioavailability and are toxic in large doses.
Selenium poisoning as a result of agricultural runoff was also found to have caused birth defects in birds.
Regardless of the cause of depleted selenium levels in AIDS patients, studies have shown that selenium deficiency does strongly corelate with the progression of the disease and the risk of death[25][26][27].
en.wikipedia.org /wiki/Selenium   (1394 words)

 Selenium: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-10-21)
Selenium is a chemical element[For more facts and a topic of this subject, click this link] in the periodic table[Follow this hyperlink for a summary of this subject] that has the symbol Se and atomic number atomic number quick summary:
Selenium is an essential micronutrient[Follow this hyperlink for a summary of this subject] in all known forms of life; it is a component of the unusual amino acid amino acid quick summary:
A selenide is a chemical compound in which selenium serves as a cation with oxidation number of -2, much as sulfur does in a sulfide....
www.absoluteastronomy.com /encyclopedia/s/se/selenium.htm   (3458 words)

 Linus Pauling Institute at Oregon State University
Selenium as gluthathione peroxidase also appears to support the activity of vitamin E (a-tocopherol) in limiting the oxidation of lipids.
Despite the strong evidence that selenium deficiency is a fundamental factor in the etiology of Keshan's disease, the seasonal and annual variation in its occurrence suggests that an infectious agent is involved in addition to selenium deficiency.
When selenium deficient mice are inoculated with a relatively harmless strain of coxsackievirus, mutations occur in the viral genome that result in a more virulent form of the virus, which causes an inflammation of the heart muscle known as myocarditis.
lpi.oregonstate.edu /infocenter/minerals/selenium   (4129 words)

 Results in
Selenium is a nonmetallic element with an atomic number of 34 and an atomic weight of 78.96.
The selenium is concentrated in the liver, kidneys, and pancreas.
Selenium is also considered an important component in naturopathic life extension (longevity) diets, because of its role in tissue repair and maintaining the youthful elasticity of skin.
www.findarticles.com /p/articles/mi_g2603/is_0006/ai_2603000651   (462 words)

 MedlinePlus Medical Encyclopedia: Selenium in diet
Selenium may assist in the synthesis of protein, in growth and development, and in fertility, especially in men.
The amount of selenium in vegetables is dependent on the selenium content of the soil.
Keshan disease is caused by a deficiency of selenium.
www.nlm.nih.gov /medlineplus/ency/article/002414.htm   (523 words)

The amount of selenium in soil, which varies by region, determines the amount of selenium in the plant foods that are grown in that soil.
Selenium supplementation is essential for anyone relying on TPN as the sole source of nutrition, and selenium supplementation has become routine during TPN administration.
Selenium is one of a group of antioxidants that may help limit the oxidation of LDL cholesterol, helping to prevent coronary artery disease.
healthlink.mcw.edu /article/964647329.html   (1463 words)

Assessment of selenium and vitamin E deficiencies in dairy herds and clinical disease in calves.
Selenium is a powerful antioxidant regulating the activity of the glutathione peroxidase enzymes, which catalyse the detoxification of hydrogen peroxide and organic hydroperoxides.
The effects of two types of selenium compounds on the expression levels of growth arrest and DNA damage-inducible (gadd) genes and on selected cell death genes were examined in mouse mammary MOD cells to test the hypothesis that the diversity of selenium-induced cellular responses to these compounds could be distinguished by unique gene expression patterns.
www.lef.org /prod_hp/abstracts/php-ab245.html   (9377 words)

 EPA Ground Water & Drinking Water > breadcrumb? > Consumer Factsheet on: SELENIUM
The greatest use of selenium compounds is in electronic and photocopier components, but they are also widely used in glass, pigments, rubber, metal alloys, textiles, petroleum, medical therapeutic agents, and photographic emulsions.
Selenium compounds are released to the air during the combustion of coal and petroleum fuels, and during the smelting and refining of other metals.
The toxicity of selenium depends on whether it is in the biologically active oxidized form, which occurs in alkaline soils.
www.epa.gov /safewater/contaminants/dw_contamfs/selenium.html   (888 words)

Selenium deficiencies are common in parts of China and the U.S. where selenium levels in the soil are low.
Selenium may be taken as part of a vitamin-mineral supplement, a nutritional antioxidant formula, or as an individual supplement.
Selenium deficiency increases the pathology of an influenza virus infection.
www.umm.edu /altmed/ConsSupplements/Seleniumcs.html   (3127 words)

 selenium   (Site not responding. Last check: 2007-10-21)
The concentration of selenium in all these food sources depends on a variable that's very hard for the consumer to determine: the level of selenium in the soil in which the plant grew (and which the animal then ate).
Selenium may decrease the "stickiness" of the blood, lessening its tendency to clot and thus reducing the risk of heart attack and stroke.
Selenium's antioxidant and anti-inflammatory actions may be enhanced when combined with vitamin E. For people with lupus, an inflammatory autoimmune disease, this nutrient duo may foster healing of the skin and help protect the heart, blood vessels, skin, joints, and other parts of the body prone to inflammation.
www.wholehealthmd.com /refshelf/substances_view/1,1525,10055,00.html   (1149 words)

 Dietary Supplement Fact Sheet: Selenium
Selenium occurs in staple foods such as corn, wheat, and soybean as selenomethionine, the organic selenium analogue of the amino acid methionine [30,31].
Selenium is one of a group of antioxidants that may help limit the oxidation of LDL cholesterol and thereby help to prevent coronary artery disease [47-49].
Selenium toxicity is rare in the U.S. The few reported cases have been associated with industrial accidents and a manufacturing error that led to an excessively high dose of selenium in a supplement [63,64].
ods.od.nih.gov /factsheets/selenium.asp   (4316 words)

 Selenium   (Site not responding. Last check: 2007-10-21)
Selenium is recovered by roasting the muds with soda or sulfuric acid, or by smelting them with soda and niter.
Selenium exhibits both photovoltaic action, where light is converted directly into electricity, and photoconductive action, where the electrical resistance decreases with increased illumination.
Elemental selenium has been said to be practically nontoxic and is considered to be an essential trace element; however, hydrogen selenide and other selenium compounds are extremely toxic, and resemble arsenic in their physiological reactions.
www.scescape.net /~woods/elements/selenium.html   (380 words)

 N101 | Selenium   (Site not responding. Last check: 2007-10-21)
Selenium activates an antioxidant enzyme called glutathione peroxidase, which may help protect the body from cancer.
Selenium supplementation has reduced the incidence of viral hepatitis in selenium-deficient populations, presumably by enhancing immune function.
Selenium is safe at the level people typically supplement (100–200 mcg); however, taking more than 900 mcg of selenium per day has been reported to cause adverse effects in some people.
www.n101.com /Static/HNs/Supp/Selenium.htm   (1149 words)

 ENIVA: Selenium   (Site not responding. Last check: 2007-10-21)
Selenium is an essential trace mineral crucial for proper function of the heart muscle.* In addition, selenium is a potent antioxidant that bonds with unstable molecules in our cells.* Researchers believe this prevents these unstable molecules from damaging cells and helps to properly contribute to the cells’ ability to reproduce themselves and the body’s youthfulness.
Selenium is an antioxidant for the cells of the body.* It plays an important role in the neuromuscular activity of the heart and supporting heart health.*
Selenium has long been recognized as a potent antioxidant and has been strongly linked to promoting health as humans age.* A particularly crucial enzyme in promoting health in the face of free radicals is glutathione peroxidase, which needs selenium in each of its four active sites to be fully functional.*
www.eniva.com /products/mfl_selenium.html   (779 words)

 ATSDR - ToxFAQs™: Selenium
Selenium is a trace mineral needed in small amounts for good health, but exposure to much higher levels can result in neurological effects and brittle hair and deformed nails.
Selenium is a naturally occurring mineral element that is distributed widely in nature in most rocks and soils.
Selenium sulfide is not present in foods and is a very different chemical from the organic and inorganic selenium compounds found in foods and in the environment.
www.atsdr.cdc.gov /tfacts92.html   (1057 words)

 Selenium - Supplements
Selenium is a trace mineral that is found in supplements in several forms such as sodium selenite, selenomethionine, and high-selenium yeast (which contains selenomethionine).
In the body, selenium functions as part of an antioxidant enzyme called glutathione peroxidase as well as being necessary for normal growth and proper utilization of iodine in thyroid function.
In one of the largest and well-controlled studies, 200mcg of selenium (from high-selenium yeast) was found to reduce the risk of several cancers, including cancer of the prostate (66%), colon (50%) and lung (40%) when compared to a group receiving a placebo.
www.supplementwatch.com /supatoz/supplement.asp?supplementId=255   (643 words)

 It's Elemental - The Element Selenium
Selenium occurs in minerals such as eucairite (CuAgSe), crooksite (CuThSe) and clausthalite (PbSe), but these minerals are too rare to use as a major source of selenium.
Selenium's resistance to the flow of electricity is greatly affected by the amount of light shining on it.
Selenium is also a semiconductor and is used in some types of solid-state electronics as well as in rectifiers, devices which convert alternating current electricity into direct current electricity.
education.jlab.org /itselemental/ele034.html   (235 words)

 MedlinePlus Drug Information: Selenium Supplements (Systemic)   (Site not responding. Last check: 2007-10-21)
Selenium deficiency is a problem in areas of the world where the soil contains little selenium.
Although selenium is being used to prevent certain types of cancer, there is not enough information to show that this is effective.
Injectable selenium is given by or under the supervision of a health care professional.
www.nlm.nih.gov /medlineplus/druginfo/uspdi/202633.html   (1188 words)

 Automate acceptance tests with Selenium
Selenium test runner scripts, also referred to as test cases, are written in HTML using a simple table layout shown in Listing 1.
Selenium is a useful and important addition to the toolbox of software engineers, designers, and testers.
An added benefit of Selenium is that it saves time and allows the team to concentrate on more valuable activities by freeing developers and testers from manual tasks which can and should be automated.
www-128.ibm.com /developerworks/library/wa-selenium-ajax   (3322 words)

In that same study, however, selenium supplementation was associated with a significant increase in the risk of developing one type of skin cancer (squamous cell carcinoma).
Although most research suggests that selenium prevents cancer, one study found an increased risk of a type of skin cancer (squamous cell carcinoma) in people taking selenium supplements.
Selenium supplementation and secondary prevention of nonmelanoma skin cancer in a randomized trial.
www.truestarhealth.com /Notes/2908005.html   (1095 words)

 Native Selenium (Se)
Selenium is also a good tracer element for medical purposes and as a isotope tracer in ground water for hydrogeologic purposes since there are as many as six stable natural isotopes of selenium.
Most elemental selenium comes from the refining of copper sulfides as selenium is a common trace element in these minerals.
Selenium the mineral, or native selenium, does not usually form good crystals but when it does they are steep rhombohedrons or tiny acicular (hair-like) crystals.
mineral.galleries.com /minerals/elements/selenium/selenium.htm   (496 words)

 [No title]
Selenium is a trace mineral found in foods such as Brazil nuts and walnuts.
Low selenium is associated with a 4- to 5-fold increased risk of prostate cancer.
Low selenium levels remained a risk factor even after the researchers took into account other factors such as age, smoking and alcohol use.
www.mercola.com /2002/jan/12/selenium.htm   (509 words)

 Selenium: Selenium
Selenium is designed specifically for the acceptance testing requirements of Agile teams.
Selenium grew out of a testing framework that was developed to acceptance-test the functionality of
Many ThoughtWorks consultants and a growing number of friends work on Selenium here at OpenQA.org and there are hopes for it to become the multi-language, multi-platform defacto standard replacement for the likes of WinRunner in the web application space.
www.openqa.org /selenium   (460 words)

 Selenium: Usage   (Site not responding. Last check: 2007-10-21)
The TestRunner mode of operation for Selenium is where its HTML and Javascript and the test suite are deployed alongside the Application Under Test (AUT) on a arbitrary web server.
Driven Selenium is where the browser is under the the control of a process on the same machine.
Selenium prefers to mount its own web server temporarily for the purposes of testing.
www.openqa.org /selenium/usage.html   (298 words)

 Chemistry : Periodic Table : selenium : key information
Elemental selenium is relatively nontoxic and is considered to be an essential trace element.
Hydrogen selenide in a concentration of 1.5 ppm is intolerable to man. Selenium occurs in some soils in amounts sufficient to produce serious effects on animals feeding on plants such as locoweed (an American plant) grown in such soils.
While there are several selenium ores, most selenium is made as a byproduct of copper refining.
www.webelements.com /webelements/elements/text/Se/key.html   (303 words)

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