<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31410860</termId><termName>ammonium sulfate</termName><termType>PT</termType><termNote><![CDATA[ Ammonium salt made from a reaction of sulfuric acid and ammonia. It is primarily produced by the destructive distillation of coal. Ammonium sulfate is a commercially important chemical used as a fertilizer, food additive, and tanning agent. ]]></termNote><termCreatedDate>2026-03-30 20:50:28</termCreatedDate><relation><relationType>UF</relationType><termId>31410861</termId><termName>sulfate, ammonium</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31373704</termId><termName>sulfate</termName><termType>PT</termType></relation></term>  </Zthes>