<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31301355</termId><termName>molecular weight</termName><termType>PT</termType><termNote><![CDATA[ The weight of a given molecule expressed in atomic weight units. ]]></termNote><termCreatedDate>2026-03-30 20:20:58</termCreatedDate><relation><relationType>UF</relationType><termId>31301356</termId><termName>molecular weights</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31301357</termId><termName>weight, molecular</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31298115</termId><termName>weight</termName><termType>PT</termType></relation></term>  </Zthes>