<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31344865</termId><termName>graphene</termName><termType>PT</termType><termNote><![CDATA[ An allotropic form of carbon material derived from graphite consisting of sheets one atom thick arranged in a two-dimensional honeycomb lattice. It has exceptionally high tensile strength, electrical conductivity, transparency, and is the thinnest two-dimensional material known. ]]></termNote><termCreatedDate>2026-03-30 20:33:01</termCreatedDate><relation><relationType>BT</relationType><termId>31320509</termId><termName>carbon</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31344472</termId><termName>graphite</termName><termType>PT</termType></relation></term>  </Zthes>