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From Longman Dictionary of Contemporary English
Related topics: Elements
magnesiummag‧ne‧si‧um /mæɡˈniːziəm/ noun [uncountable]  HCEa common silver-white metal that burns with a bright white flame. It is a chemical element: symbol Mg
Examples from the Corpus
magnesiumThe hypocalcemia and hypomagnesemia respond readily to administration of magnesium salts.The use of diuretics in those conditions may augment the depletion of magnesium.The kidney is the principal regulator of magnesium balance.Drought resulted in decreased root growth and slower breakdown of soil litter, an important source of magnesium for forest trees.The important minerals are calcium, zinc, iron, potassium, magnesium, phosphorus and iodine.As mentioned above, to remove magnesium bicarbonate hardness requires twice as much lime as is needed for calcium bicarbonate.Experimental phosphate deficiency in humans may induce renal magnesium loss.Calcium permanent hardness requires the more expensive sodium carbonate, whereas magnesium permanent hardness requires both lime and sodium carbonate.
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