ultramicrotome

ul·tra·mi·cro·tome

U0011600 (ŭl′trə-mī′krə-tōm′)n. 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.

ultramicrotome

(ˌʌltrəˈmaɪkrəˌtəʊm) n (Biology) microscopy a microtome used for cutting sections for examination by an electron microscope

ul•tra•mi•cro•tome

(ˌʌl trəˈmaɪ krəˌtoʊm)

n. a microtome capable of producing very fine slices of tissue or cellular specimens for examination by electron microscope. [1945–50]

Ultramicrotome

enUK

ultramicrotome

[¦əl·trə′mī·krə‚tōm] (engineering) A microtome which uses a glass or diamond knife, allowing sections of cells to be cut 300 nanometers in thickness.

Ultramicrotome

an instrument for cutting extremely thin sections of tissue for examination under an electron microscope.

The motion of the knife or the tissue is strictly regulated at a specific height in order to obtain sections that are usually not thicker than 200 angstroms (A) and are sometimes about 50 A thick. The thickness of a section depends on the quality of the fixing medium and the sharpness of the cutting edge of the knife. In most ultramicrotomes, the knife does not move, and the tissue is moved mechanically or, most often, thermally. The thermal mechanism, which was proposed in 1953 by F. Sjôstrand, operates on the basis of the controlled thermal expansion of the support rod to which the tissue is attached.

The USSR has developed an ultramicrotome based on the thermal mechanism that furnishes sections with a thickness of 50-800 A. Glass and diamond blades are used in ultramicrotomes. The quality of the blades is checked under a dark-field microscope, where the cutting edge of a blade of sufficient quality appears as a bright straight line.

REFERENCES

Elektronnomikroskopicheskie metody issledovaniia biologicheskikh ob”ektov. Moscow, 1963.
Weakley, B. S. Elektronnaia mikroskopiia dlia nachinaiushchikh. Moscow, 1975.
Sjôstrand, F. S. Electron Microscopy of Cells and Tissues, vol. 1. New York-London, 1967.

S. IA. ZALKIND

ultramicrotome

ul·tra·mi·cro·tome

(ŭl'tră-mī'krō-tōm), A microtome used in cutting sections 0.1 mcm thick, or less, for electron microscopy.

ultramicrotome

(ŭl′trə-mī′krə-tōm′)n. 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.

ul·tra·mi·cro·tome

(ŭl'tră-mī'krŏ-tōm) A device used in cutting sections 0.1 mcm thick, or less, for electron microscopy.

ultramicrotome

A MICROTOME for cutting very thin slices of specimens to be examined by electron microscopy.

ultramicrotome

an instrument that cuts very thin sections for use on the ELECTRON MICROSCOPE. It has a blade of fine glass or a diamond knife.

单词	ultramicrotome
释义	ultramicrotome enUK ul·tra·mi·cro·tome U0011600 (ŭl′trə-mī′krə-tōm′)n. 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. ultramicrotome (ˌʌltrəˈmaɪkrəˌtəʊm) n (Biology) microscopy a microtome used for cutting sections for examination by an electron microscope ul•tra•mi•cro•tome (ˌʌl trəˈmaɪ krəˌtoʊm) n. a microtome capable of producing very fine slices of tissue or cellular specimens for examination by electron microscope. [1945–50] Ultramicrotome enUK ultramicrotome [¦əl·trə′mī·krə‚tōm] (engineering) A microtome which uses a glass or diamond knife, allowing sections of cells to be cut 300 nanometers in thickness. Ultramicrotome an instrument for cutting extremely thin sections of tissue for examination under an electron microscope. The motion of the knife or the tissue is strictly regulated at a specific height in order to obtain sections that are usually not thicker than 200 angstroms (A) and are sometimes about 50 A thick. The thickness of a section depends on the quality of the fixing medium and the sharpness of the cutting edge of the knife. In most ultramicrotomes, the knife does not move, and the tissue is moved mechanically or, most often, thermally. The thermal mechanism, which was proposed in 1953 by F. Sjôstrand, operates on the basis of the controlled thermal expansion of the support rod to which the tissue is attached. The USSR has developed an ultramicrotome based on the thermal mechanism that furnishes sections with a thickness of 50-800 A. Glass and diamond blades are used in ultramicrotomes. The quality of the blades is checked under a dark-field microscope, where the cutting edge of a blade of sufficient quality appears as a bright straight line. REFERENCES Elektronnomikroskopicheskie metody issledovaniia biologicheskikh ob”ektov. Moscow, 1963. Weakley, B. S. Elektronnaia mikroskopiia dlia nachinaiushchikh. Moscow, 1975. Sjôstrand, F. S. Electron Microscopy of Cells and Tissues, vol. 1. New York-London, 1967. S. IA. ZALKIND ultramicrotome enUK ul·tra·mi·cro·tome (ŭl'tră-mī'krō-tōm), A microtome used in cutting sections 0.1 mcm thick, or less, for electron microscopy. ultramicrotome (ŭl′trə-mī′krə-tōm′)n. 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. ul·tra·mi·cro·tome (ŭl'tră-mī'krŏ-tōm) A device used in cutting sections 0.1 mcm thick, or less, for electron microscopy. ultramicrotome A MICROTOME for cutting very thin slices of specimens to be examined by electron microscopy. ultramicrotome an instrument that cuts very thin sections for use on the ELECTRON MICROSCOPE. It has a blade of fine glass or a diamond knife. ThesaurusSeemicrotome
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