Heavy metals, in traces, are essential for all forms of life. They are taken up by the living cell as cations, and their uptake is strictly regulated because most (or all) of them are toxic in excess. A remarkable specificity has been found: seldom can an excess of one essential metal prevent the damage caused by deficiency of another. In fact, such an excess often increases the injurious effect of the deficiency.
KeywordsMagnesium Glycine Histidine Staphylococcus Transferrin
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