<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31343478</termId><termName>trace elements</termName><termType>PT</termType><termNote><![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. ]]></termNote><termCreatedDate>2026-03-30 20:32:38</termCreatedDate><relation><relationType>UF</relationType><termId>31343479</termId><termName>accessory elements</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343480</termId><termName>elements, accessory</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343481</termId><termName>elements, guest</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343482</termId><termName>elements, minor</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343483</termId><termName>elements, trace</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343484</termId><termName>guest elements</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343485</termId><termName>metals, trace</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343486</termId><termName>microelements</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343487</termId><termName>minor elements</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343488</termId><termName>trace element</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343489</termId><termName>trace metals</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31319740</termId><termName>elements</termName><termType>PT</termType></relation></term>  </Zthes>