icosahedron

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Related to icosahedral: icosahedral virus, Icosahedral capsid, Icosahedral symmetry

icosahedron

(īkō'səhē`drən): see polyhedronpolyhedron
, closed solid bounded by plane faces; each face of a polyhedron is a polygon. A cube is a polyhedron bounded by six polygons (in this case squares) meeting at right angles.
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Icosahedron

A regular polygon bounded by 20 equilateral triangles, with 12 vertices and 20 edges.

icosahedron

[ī¦kä·sə¦hē·drən]
(mathematics)
A 20-sided polyhedron.

icosahedron

a solid figure having 20 faces. The faces of a regular icosahedron are equilateral triangles
References in periodicals archive ?
The 120 operations of the binary icosahedral group 2I are represented by 120 unit quaternions, and 2I contains almost all the rotation operations needed for the 7 fermion family groups.
This bird, like the previously described kestrels, had diffuse necrosis of the liver, basophilic to eosinophilic pan-nuclear inclusions within hepatocytes, and paracrystalline arrays of icosahedral viruses of appropriate size where detected by electron microscopy.
12] was carried out by introduction into it of titanium, chromium and silicon at ratio 60:32:8, corresponding to alloy TiCrSi with icosahedral quasi-crystalline structure.
The binary tetrahedral, octahedral and icosahedral rotation groups are the finite groups of Mobius transformations PSL(2, [Z.
Figure 11 illustrates the most common partitioning methods defined on an icosahedron and projected to the sphere using the inverse Icosahedral Snyder Equal Area (ISEA) Projection (Snyder 1992).
Quasiperiodic objects can have any of the infinite set of point group symmetries listed as non-crystallographic in the International Tables for Crystallography (4); because they have a single rotation axis of order 5, or one greater than or equal to 7, or have icosahedral symmetry with its six intersecting 5-fold axes.
Indeed, the piece was accompanied by wall text that cites the source of the title (a poem by Paul Celan) and signage indicating that the work is essentially a flattened scale model of the sky, part of a geodesy that could be constructed as an icosahedral dome of 1, 210 triangles.
550" core formulation, a speed enhancing and spin controlling ionomer casing, shear and abrasion-resistant Urethane Elastomer cover and new aerodynamic icosahedral design.
In viruses, the viral genome (double- or single-stranded RNA or DNA) is associated to multiple copies of a capsid protein, forming predominantly icosahedral or helical architectures.
Parvoviruses are small icosahedral viruses with linear single-stranded DNA genomes of ~5 kb that are associated with a wide spectrum of illnesses in humans and animals.
It is a small, non-enveloped virus, and is 27nm in diameter, with a highly stable icosahedral protein capsid containing an RNA genome of 7.
After summarizing the current state of boron polymer chemistry, Materials scientists, chemists, and biotechnologists look at polymers with icosahedral closo-dicarbaborane units, polymers with boron and nitrogen and their use in advanced materials, and organo-boron polymers and using electrolytes of them for selective lithium cation transport.