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A microtome for cutting very thin sections of material for use in electron microscopy.

ul′tra·mi·crot′o·my (-mī-krŏt′ə-mē) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biology) microscopy a microtome used for cutting sections for examination by an electron microscope
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌʌl trəˈmaɪ krəˌtoʊm)

a microtome capable of producing very fine slices of tissue or cellular specimens for examination by electron microscope.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Resin blocks were sectioned with a Porter Blum ultramicrotome, sections were mounted on copper meshes and stained with uranyl acetate for 45 minutes and lead citrate for 15 minutes.
For the transmission electron microscope G2 Spirit (FEI, Czech Republic) observations, ultrathin (60 nm) sections were prepared under liquid nitrogen using an Ultracut UCT (Leica) ultramicrotome.
A Leica Ultramicrotome UC7 fitted with an FC7 cryo-microtome was used to obtain approximately 40 nm thick sections of the cured composites.
Ultrathin sections were taken with LKB ultramicrotome III and stained with uranyl acetate and lead citrate.
Semi-thin sections of 1 um thickness were obtained with an ultramicrotome (Leica ultracut R, Germany).
Ultrathin sections (40 to 50 nm) of tissue samples were cut using a Leica Ultracut UCT ultramicrotome (Leica Company, Solms, Gemany).
Following polymerization of the resin, 1 [micro]-thick sections were cut on an ultramicrotome with glass knives, stained with toluidine blue, and evaluated by light microscopy for regions of interest.
For TEM experiments, PE-nanocomposite membranes were carefully prepared using an ultramicrotome at room temperature using a diamond knife.
Half-thin sections were cut using an Ultracut E ultramicrotome, stained with toluidine blue and photographed in a light microscope (Olympus CX41, Olympus Co., Tokyo, Japan).
Gold sections (70 nm) made using ultramicrotome (Reichert Jung Ultracut E, Germany), were placed on copper grids and left to dry.
The ultra-thin slices were prepared with an ultramicrotome (75A, UCT, LEICA Ultracut, Germany), double-stained with uranyl acetate and lead citrate, and observed under a Type JEM-1230 electron microscope (JEOL, Japan).