<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">trace elements</topic></authority><related type="broader"><topic>elements</topic></related><variant type="other"><topic>minor elements</topic></variant><variant type="other"><topic>trace element</topic></variant><variant type="other"><topic>trace metals</topic></variant><variant type="other"><topic>accessory elements</topic></variant><variant type="other"><topic>elements, accessory</topic></variant><variant type="other"><topic>elements, guest</topic></variant><variant type="other"><topic>elements, minor</topic></variant><variant type="other"><topic>elements, trace</topic></variant><variant type="other"><topic>guest elements</topic></variant><variant type="other"><topic>metals, trace</topic></variant><variant type="other"><topic>microelements</topic></variant> <note xml:lang="en"><![CDATA[ Elements found in minute quantities in minerals, not essential to their composition but found in their structure or adsorbed on their surface, conventionally held to constitute significantly less than 1.0% of the mineral. Use also for elements found in plant and animal tissue in concentrations of 1.0% or less, which are physiologically essential to the organism. ]]></note></mads>