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Selenium

History

Selenium was discovered in 1817 a by Sweden chemist Jens Jakob Berzelius. Scientific falyun sulfur examined for the presence tellurium un it, but found a new metal. He called it selenium, that the reason was that he always accompanies tellurium as the moon, our planet. In 1938, an American engineer Cherster Carlson patented method «Selenium photos», which is now known as xerography, or elektrography. Devices based on this method used so far.

Nowadays

Today it is known of great biological role of selenium in living organisms. For example, we prove the necessity of selenium for the retina, which is responsible for sharp-sightedness. Active use of selenium was launched in 50 years. At this time the price of selenium increased by tens of times and it is connected with the use of selenium in semiconductors. Usually selenide used of tin, bismuth, antimony, lead, lanthanides. In agriculture, it is used mikroaddings of selenium in animal feed. Selenium is also used in the manufacture of glass to make them red.

Date ASIA EUROPE USA
26/12/2009 89.34 89.34 89.34
19/12/2009 89.34 89.34 89.34
12/12/2009 89.34 89.34 89.34
05/12/2009 89.35 89.35 89.35
28/11/2009 90.6 90.6 90.6
21/11/2009 89.34 89.34 89.34
14/11/2009 81.67 81.67 81.67
07/11/2009 82.96 82.96 82.96
31/10/2009 80.94 80.94 80.94
24/10/2009 82.55 82.55 82.55
17/10/2009 89.35 89.35 89.35
10/10/2009 89.37 89.37 89.37
02/10/2009 89.36 89.36 89.36
25/09/2009 89.35 89.35 89.35
18/09/2009 80.66 80.66 80.66
12/09/2009 80.54 80.54 80.54
05/09/2009 80.94 80.94 80.94
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