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элемент в следовом количестве
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[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en] |
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trace element
Any of various chemical elements that occur in very small amounts in organisms and are essential for many physiological and biochemical processes. (Source: CED)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en] |
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