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I. Zinc

Jonathan C. L. Shaw, FRCP

Am J Dis Child. 1979;133(12):1260-1268.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

Perhaps the most remarkable fact about trace elements is not their scarcity, but their abundance in the tissues of the human body. Table 1 gives the relative amounts in a baby at term of some of the substances that are thought to be essential for normal growth and development. From such data one can calculate that a full-term infant, comprising some 3.4 x 10²⁶ atoms, contains 1.4 x 10²² trace element atoms. Chromium is perhaps one of the least abundant essential trace elements in the body, and yet the newborn baby contains about 3.6 x 10¹⁸ chromium atoms, and even a single hepatocyte contains some 4.5 million atoms of this element. The name "trace element" is, of course, quite arbitrary and survives from the time when early investigators, with the methods then available, were experiencing great difficulties in measuring these substances in plant and animal tissues. The . . . [Full Text PDF of this Article]

Author Affiliations
From the Department of Paediatrics, University College Hospital, London.

Footnotes
Reprint requests to Department of Paediatrics, University College Hospital, London, WC1E 6JF, England (Dr Shaw).

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