Jisho

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Noun
1. ultrastructure; fine structure; microstructureBiology
Noun
2. fine structurePhysics
Wikipedia definition
3. UltrastructureUltrastructure (or ultra-structure) is the detailed structure of a biological specimen, such as a cell, tissue, or organ, that can be observed by electron microscopy. It refers in general to the study of cellular structures that are too small to be seen with an optical microscope. Ultrastructure, along with molecular phylogeny, has often been a reliable way of classifying organisms.
Read “Ultrastructure” on English Wikipedia
Read “微細構造” on Japanese Wikipedia
Read “Ultrastructure” on DBpedia

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