Monday, August 22, 2011

Zinc



Zinc is involved in numerous aspects of cellular metabolism. It is required for the catalytic activity of approximately 100 enzymes and it plays a role in immune function, protein synthesis, wound healin, DNA synthesis, and cell division. Zinc also supports normal growth and development during pregnancy, childhood, and adolescence and is required for proper sense of taste and smell. A daily intake of zinc is required to maintain a steady state because the body has no specialized zinc storage system.

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Zinc makes up about 75 ppm (0.0075%) of the Earth's crust, making it the 24th most abundant element...







Zinc is too large and heavy to form in stars using the silicon burning process. The stable form of zinc is created in supernovas...

Zinc ores were used to make the zinc–copper alloy brass many centuries prior to the discovery of zinc as a separate element...Knowledge of how to produce brass spread to Ancient Greece by the 7th century BC but few varieties were made...







...impure zinc was known from antiquity to exist in the remnants in melting ovens, but it was usually discarded, as it was thought to be worthless...



Zinc mines at Zawar, near Udaipur in India, have been active since the Mauryan period in the late 1st millennium BC.




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