icosahedral


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i·co·sa·he·dral

(ī'kō-să-hē'drăl),
Having 20 equilateral triangular surfaces and 12 vertices, as do most viruses with cubic symmetry.
[G. eikosi, twenty, + -edros, having sides or bases]
References in periodicals archive ?
In the [Al.sub.63][Cu.sub.25][Fe.sub.12] alloy, the formation of the icosahedral phase is the result of a peritoneal reaction between phase [beta]-Al (Fe, Cu) with the remaining liquid.
Feng, "Three-dimensional open framework built from Cu-S icosahedral clusters and its photocatalytic property," Journal of the American Chemical Society, vol.
However, it is quasirational with respect to the quasilattice P, known in physics as the simple icosahedral lattice [18], that is generated by the following vectors in [R.sup.3]:
HPVB19 is the first known human virus in the Parvoviridae family, genus Erythroparvovirus, which is a nonenveloped, icosahedral virus containing a single-stranded linear DNA genome [9].
The human parvovirus B19 (B19V), a member of the Erythroparvovirus genus (Parvoviridae family), is a small, non-enveloped icosahedral virus composed of two structural proteins VP1 (83kDa) and VP2 (58kDa) surrounding a linear single-stranded DNA genome of approximately 5.6 Kb.
While crystals can exhibit only two, three, four, or six-fold rotational symmetry, quasicrystals can exhibit seemingly "impossible" five-fold symmetry in two dimensions and icosahedral symmetry in three dimensions.
Herpes Simplex Virus (HSV) is a neurotropic virus with a large linear, double-stranded DNA genome, protected by a capsid with icosahedral symmetry.
BVDV is classified under the Pestivirus genus of the Flaviviridae family, has a single-stranded, 12.5-kb positive sense RNA genome, and contains an enveloped icosahedral capsid of 40-60nm in diameter (HORZINEK, 1991).
RSV is a 15 kb negative sense RNA enveloped virus with both spherical and helical structural forms, and therefore has greater genomic and structural similarity to Ebola virus (19 kb negative sense enveloped helical RNA virus) than HCV (9.6 kb positive sense enveloped icosahedral RNA virus) and despite its lability has been shown to contaminate fomites (26).
The protein designers took their cue from the many viruses that, en route to living cells, transport their genomes inside protective icosahedral protein shells.
Viral particle is spherical in shape, about 50nm in diameter, has an icosahedral capsid surrounded by a lipid layer.