News tagged with selenium
A greater level of toenail selenium was associated with a significant decrease in the risk for advanced prostate cancer, according to data presented at the AACR Annual Meeting 2013, held in Washington, D.C., April 6-10.
Cancer Apr 10, 2013 | not rated yet | 0
Enriching crops by adding a naturally-occurring soil mineral to fertilisers could potentially help to reduce disease and premature death in the African country of Malawi, researchers have said.
Health Mar 12, 2013 | not rated yet | 0
If you're planning a romantic Italian dinner this Valentine's Day, you may want to consider drinking a glass of milk along with your meal.
Health Feb 05, 2013 | not rated yet | 0
A systematic review published today in The Cochrane Library finds that in well-nourished adults current evidence does not support selenium for preventing heart disease. The review suggests that taking selenium supplements does n ...
Health Jan 30, 2013 | not rated yet | 0
Increasing dietary intake of the antioxidant vitamins C, E, and selenium could help cut the risk of developing pancreatic cancer by up to two thirds, suggests research published online in the journal Gut.
Cancer Jul 23, 2012 | 5 / 5 (1) | 0
Beta-carotene, selenium and folic acid taken up to three times their recommended daily allowance, these supplements are probably harmless. But taken at much higher levels as some supplement manufacturers suggest, these ...
Cancer May 15, 2012 | 3 / 5 (1) | 0
Selenium supplements could be harmful to people who already have enough selenium in their diet: study
Although additional selenium might benefit people who are lacking in this essential micronutrient, for those who already have enough selenium in their diet (including a large proportion of the USA population), taking selenium ...
Health Feb 28, 2012 | not rated yet | 0
High bodily levels of the trace elements nickel and selenium may lower the risk of developing the most common type of pancreatic cancer, finds research published online in Gut.
Cancer Dec 20, 2011 | 5 / 5 (1) | 0
(Medical Xpress) -- A new type of sugar could help prevent heart disease, according to latest research by Dr Corin Storkey and Professor Carl Schiesser from the ARC Centre of Excellence for Free Radical Chemistry and Biotechnology ...
Medical research Dec 05, 2011 | 1 / 5 (1) | 0 |
New research is prompting a fresh look at the value of vitamin supplements, with some surprising results indicating that taking too many supplements of some could be harmful.
Health Oct 17, 2011 | 1.8 / 5 (4) | 5
Severe deficiency of the vitamins and minerals required for life is relatively uncommon in developed nations, but modest deficiency is very common and often not taken seriously. A new research published online in the FASEB Jo ...
Health May 31, 2011 | 5 / 5 (2) | 0 |
Although some people believe that taking selenium can reduce a person's risk of cancer, a Cochrane Systematic Review of randomised controlled clinical trials found no protective effect against non-melanoma skin cancer or ...
Cancer May 11, 2011 | not rated yet | 0
(PhysOrg.com) -- For some time it has been believed that vitamin E, selenium and soy were natural ways to prevent prostate cancer. However, a new study published in the Journal of Clinical Oncology shows that these supple ...
Cancer May 06, 2011 | 3 / 5 (2) | 2 |
Selenium (pronounced /səˈliːniəm/) is a chemical element with the atomic number 34, represented by the chemical symbol Se, an atomic mass of 78.96. It is a nonmetal, chemically related to sulfur and tellurium, and rarely occurs in its elemental state in nature.
Isolated selenium occurs in several different forms, the most stable of which is a dense purplish-gray semi-metal (semiconductor) form that is structurally a trigonal polymer chain. It conducts electricity better in the light than in the dark, and is used in photocells (see allotropes section below). Selenium also exists in many non-conductive forms: a black glass-like allotrope, as well as several red crystalline forms built of eight-membered ring molecules, like its lighter chemical cousin sulfur.
Selenium is found in economic quantities in sulfide ores such as pyrite, partially replacing the sulfur in the ore matrix. Minerals that are selenide or selenate compounds are also known, but all are rare. The chief commercial present uses for selenium are in glassmaking and in chemicals and pigments. Electronic uses for selenium, once important, have been supplanted by silicon semiconductor devices.
Selenium salts are toxic in large amounts, but trace amounts of the element are necessary for cellular function in most, if not all, animals, forming the active center of the enzymes glutathione peroxidase and thioredoxin reductase (which indirectly reduce certain oxidized molecules in animals and some plants) and three known deiodinase enzymes (which convert one thyroid hormone to another). Selenium requirements in plants differ by species, with some plants apparently requiring none.
For more information about Selenium, read the full article at
This text uses material from Wikipedia and is available under the GNU Free Documentation License.