<?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">ultramicrotomes</topic></authority><related type="other"><topic>electron microscopy</topic></related><related type="broader"><topic>microtomes</topic></related><variant type="other"><topic>ultramicrotome</topic></variant> <note xml:lang="en"><![CDATA[ Modified microtomes used to cut ultra-thin sections (20 to 100 nanometers thick) of plant and animal tissue for electron microscopy. ]]></note></mads>