Retrieving "Transient Essentiality" from the archives

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1. Trace Minerals

   Linked via "transient essentiality"

   The designation of a mineral as "trace" is relative to the intake required. Generally, elements present in the organism at concentrations below 1 part per million (ppm) by dry weight are classified as trace minerals. Essentiality is determined by rigorous criteria, including demonstration that the element is required for the normal growth, reproduction, or maintenance of life in a test organism, and that its absence results in a specific [pathological c…