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・ International Union for Physical and Engineering Sciences in Medicine
・ International Union for Prehistoric and Protohistoric Sciences
・ International Union for Quaternary Research
・ International Union for Science Communicators
・ International Union for the Protection of New Varieties of Plants
・ International Union for the Study of Social Insects
・ International Union of Air Pollution Prevention and Environmental Protection Associations
・ International Union of Allied Novelty and Production Workers
・ International Union of Anarchists
・ International Union of Architects
・ International Union of Basic and Clinical Pharmacology
・ International Union of Biochemistry and Molecular Biology
・ International Union of Biological Sciences
・ International Union of Bricklayers and Allied Craftworkers
・ International Union of Catholic Esperantists
International Union of Crystallography
・ International Union of Elevator Constructors
・ International Union of Exhibitions and Fairs
・ International Union of Food Science and Technology
・ International Union of Food, Agricultural, Hotel, Restaurant, Catering, Tobacco and Allied Workers' Association
・ International Union of Forest Research Organizations
・ International Union of Geodesy and Geophysics
・ International Union of Geological Sciences
・ International Union of Guides and Scouts of Europe
・ International Union of History and Philosophy of Science
・ International Union of Immunological Societies
・ International Union of Microbiological Societies
・ International Union of Mine, Mill and Smelter Workers
・ International Union of Mine, Mill and Smelter Workers, Local 890
・ International Union of Muslim Scholars


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International Union of Crystallography : ウィキペディア英語版
International Union of Crystallography

The International Union of Crystallography (IUCr) is a member of the International Council for Science (ICSU) and exists to serve the world community of crystallographers.
It was founded 1948 with the help of Ralph Walter Graystone Wyckoff who served as Vice-president and President from 1951 to 1957.〔"Ralph W. G. Wyckoff 1897-1994," ''Acta Cryst''. (1995). A51, 649-650. Accessed online at http://ww1.iucr.org/people/wyckoff.htm on 3/23/2010〕
== Symmetry notation ==
The IUC notation is the notation for the symmetry group adopted by the International Union of Crystallography in 1952. It names the wallpaper groups with a 4 character name. First it has a ''P'' or ''C'' for ''primitive'' or ''centered'' groups. Groups are given a number 1, 2, 3, 4, or 6 for the highest order of symmetry. Groups can have one or two reflections, given as vertical mirrors first (horizontal reflection), and horizontal second (vertical reflection). A simple reflection is given an ''m'' (mirror), and a glide-reflection is given a ''g''. Place holder ''1'' are given for an orthogonal direction with no reflections.

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