(se) selenyum

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Definition of (se) selenyum in Turkish English dictionary

(Nükleer Bilimler) selenium

A nonmetallic chemical element (symbol Se) with an atomic number of 34

Chemical symbol Se A gray metal chemically similar to tellurium; excellent conductor of electricity; obtained as a by-product of the electrolytic refining of copper; used chiefly in photoelectric cells, rectifiers, and other electronic devices, and as a pigment for glass and ceramics

Occurs naturally in food and soils and is used in electronics, photocopy operations, the manufacture of glass, chemicals, drugs, and as a fungicide and a feed additive Measured in mg/L or ppm The MCL for selenium is 0 05 mg/L or ppm

What it's good for: Works with vitamin E as an antioxidant and binds with toxins in the body, rendering them harmless Where you get it: Lobster, clams, crabs, whole grains, Brazil nuts and oysters RDA: 55 mg for women and 70 mg for men

Atomic weight 78

It is found in small quantities with sulphur and some sulphur ores, and obtained in the free state as a dark reddish powder or crystalline mass, or as a dark metallic-looking substance

A nonmetallic element of the sulphur group, and analogous to sulphur in its compounds

An essential mineral involved primarily in enzymes that are antioxidants Three selenium- containing enzymes are antioxidant peroxidases and a fourth selenium-containing enzyme is involved in thyroid hormone production The prostate contains a selenium-containing protein and semen contains relatively large amounts of selenium Clinical studies show that selenium is important in lowering the risk of several types of cancers

A finely ground form of an elementary metal; used as a vulcanizing agent in rubber compounds

Symbol Se

a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable gray metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite)

Selenium is a naturally occurring element found in sedimentary rock formations, generally combined with sulfide minerals or silver, copper, lead, or nickel It is released to the environment through natural processes or by such anthropogenic sources as coal combustion, petroleum fuel combustion, and smelting and efining of metals There are 271 metals industry-related facilities in the Lake Michigan basin that may serve as sources of selenium

a metallic trace element that combines with glutathione to form a major cellular antioxidant

a trace mineral; its principal function is to inhibit fat oxidation, especially in conjunction with Vitamin E Selenium protects the immune system, maintains heart, liver, and pancreatic function, and keeps tissues elastic It protects the liver during cirrhosis from alcoholism Deficiency is associated with exhaustion, growth impairment, high cholesterol, infection, liver and pancreatic problems, heart disease and cancer Much of continental U S farmland is low in selenium, resulting in selenium-deficient produce

It is widely distributed, usually in small amounts, occasionally uncombined but more often as selenides of iron, lead, silver, or copper. Selenium has several allotropes; the gray metallic crystalline form is the most stable at room temperature. Its electrical conductivity increases when light strikes it, and it can convert light directly into electricity, so selenium is used in photocells (e.g., in light meters and security alarms), solar cells, and photocopiers. It also has been used in rectifiers to convert alternating to direct electric current. It serves as a red colorant for glass and glazes. Selenium has valence 2, 4, and 6 in its compounds, many of which are toxic though the element is not. Selenium dioxide is an important reagent in organic chemistry. Vital to living cells, it works as an antioxidant in the body and is being studied for a variety of possible beneficial health effects; it is used in nutritional supplements and animal feeds

- A mineral that has potent antioxidant properties Selenium inhibits the oxidation of fats and protects vitamin E

a poisonous chemical substance, used in electrical instruments to make them sensitive to light. It is a chemical element : symbol Se (selene ). Semimetallic chemical element, chemical symbol Se, atomic number

An element that closely resembles sulfur in its properties The main use in steel is as a free cutting additive but due to high cost its use is limited to stainless steel One of the benefits being the ability to obtain a very good surface finish on machined components

Works with vitamin E as an antioxidant neutralising free radicals

Hyphenation

(se) se·len·yum