Freeze-substitution for thin-section study of biological specimens. 1989

A Ichikawa, and M Ichikawa, and K Sasaki

Freeze-substitution as a preparation technique for frozen specimens is briefly reviewed. Recent advance in cryotechniques, especially quick freezing followed by freeze-substitution, has made it possible to preserve the ultrastructural features of cells and tissues to reflect more closely their living state and capture transient physiological processes as evanescent as fusion and fission of biological membranes. The technique is also advantageous to retain soluble substances of the cellular components. Thus, histochemical, autoradiographic and/or immunocytochemical analyses of quick-frozen, substitution-fixed samples allow us to obtain more precise localization of chemical components in cells than in the case of conventional chemical fixation. Several examples indicating the superiority of the preparatory method are presented.

UI MeSH Term Description Entries
D008854 Microscopy, Electron Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen. Electron Microscopy
D005615 Freezing Liquids transforming into solids by the removal of heat. Melting
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia

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