thin section

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thin sec·tion

, ultrathin section
a section of tissue for electron microscopic examination; the specimen is fixed, typically in glutaraldehyde and/or in osmium tetroxide, embedded in a plastic resin, and sectioned at less than 0.1 mcm in thickness with a glass or diamond knife in an ultramicrotome.

thin sec·tion

, ultrathin section (thin sek'shŭn, ŭl'tră-thin)
A section of tissue for electron microscopic examination; the specimen is fixed, typically in glutaraldehyde or osmium tetroxide, embedded in a plastic resin, and sectioned at less than 0.1 mcm in thickness with a glass or diamond knife in an ultramicrotome.