(1) A recent systematic investigation of domain structures consisting of juxtaposed icosahedral columns is also presented.
(2) contained DNA genome, replicated within the nuclei of infected cells, and were icosahedral in shape.
(3) Human rotavirus has a characteristic icosahedral structure which has a honeycomb-like appearance on the surface of the smooth particles and 42 polygonal capsomeres in the rough particles.
(4) We further argue that the M-protein is not arranged with icosahedral symmetry.
(5) The different preparations of purified virions displayed an icosahedral symmetry, were non-enveloped, and had a mean diameter that varied from 12 to 15 nm when negatively stained.
(6) As an appendix to that report, models for the T4 phage heads, based on previously developed architectural principles for assembly of icosahedral virus, are compared with the data for the best fit.
(7) Infectious pancreatic necrosis virus of fish, infectious bursal disease virus of chickens, Tellina virus and oyster virus of bivalve molluscs, and drosophila X virus of Drosophila melanogaster are naked icosahedral viruses with an electron microscopic diameter of 58 to 60 nm.
(8) Human rhinovirus 14 has a pseudo T = 3 icosahedral structure in which 60 copies of the three larger capsid proteins VP1, VP2 and VP3 are arranged in an icosahedral surface lattice, reminiscent of T = 3 viruses such as tomato bushy stunt virus and southern bean mosaic virus.
(9) An F lac pro mutant which was temperature sensitive for infection by the filamentous bacteriophage f1 but resistant to the F-specific icosahedral RNA phage f2 was isolated.
(10) All were morphologically identical, with icosahedral capsids (50-65 nm diameter) and short tails (15-25 nm long), but Np had a more restricted host range, replicating only in smooth strains of B. abortus.
(11) The agent responsible for the skin epitheliomas in our hamster facility was an icosahedral, 36-nm virion compatible with the morphology of a polyomavirus or simian virus 40.
(12) The extracellular form of bacteriophage phi X174 consists of single-stranded DNA within an icosahedral capsid, which has short spikes at each of its vertices.
(13) Satellite tobacco necrosis virus (STNV) is an icosahedral virus which contains three classes of Ca2+ binding site.
(14) The length-to-width ratios of bacteriophage T2 and T4 heads and stereometric angles specifying the prolate icosahedral T2 capsid were evaluated on electron micrographs recorded from samples prepared by a variety of methods.
(15) With the exception of phage Qbeta, the RNAs of all the other small icosahedral RNA viruses so far examined contain a poly (A) tract.
(16) Purified virions had similar size and shape (icosahedral) for each virus, and the genomic DNAs of each virus were methylated by a virus-induced DNA methyltransferase.
(17) Purified virions displayed an icosahedral symmetry, were nonenveloped, and had a mean diameter of 14 to 16 nm negatively stained.
(18) The geminiviruses are a group of plant viruses containing single-stranded (ss) DNA in particles comprising two quasi-icosahedral units.
(19) From the data reported, it may be concluded that the enzyme structure can be described as an icosahedral capsid of 60 beta-subunits with the triangulation number T = 1.
(20) The mechanism that ensures the location of the 12-fold symmetrical portal at only one of the 12 5-fold vertices of an icosahedral virus capsid presents a unique assembly problem, which, in some viruses, is solved by the portal also acting as initiator of procapsid assembly.
Icosahedron
Definition:
(n.) A solid bounded by twenty sides or faces.
Example Sentences:
(1) The dimensions and shape of the head are compatible with those of a regular icosahedron.
(2) These data showed the feasibility of the insertion of foreign sequences in a specific antigenically active locus of the poliovirus icosahedron, and suggest some limitations with respect to the sequences to be 'transplanted'.
(3) Older cultures revealed clusters of icosahedrons some of which degenerated spontaneously; others were surrounded by proteinic structure having a fringed aspect.
(4) Icosahedron-shaped particles with an average diameter of 33 nm were liberated by treatment of the fraction with the detergent Tween 80.
(5) Electron microscopic studies demonstrated that purified virions have a typical adenovirus morphologic characteristic, with 50-nm-long fiber projections at each vertex of an 80-nm-diameter icosahedron.
(6) The internal space of an icosahedron can optimally be filled by 12 geometrical figures each of which is a combination of a cone and more than half of a sphere.
(7) Phage Bam35 is an icosahedron of about 63 nm in diameter.
(8) These data predict that the nucleocapsid contains 240 copies of protein and is a T = 4 icosahedron.
(9) The virus is composed of 32 hollow morphological units representing a regular T = 3 icosahedron.
(10) Treatment of single-capsid rotavirus particles with 30% formamide or 5 M-urea resulted in their degradation, giving rise to very similar products, corresponding to isolated vertices, edges and faces of the virus icosahedron.
(11) This virus was an icosahedron of 145 nm and most likely to be placed in the family Iridoviridae.
(12) Approximately 15 molecules of IX were found per group of nine hexons and from considerations of symmetry it seemed possible that IX was located at the 'corner to edge' contacts between hexons in the icosahedron.
(13) This paper describes a method for the rapid searching of rotational three-dimensional space, relying on the symmetries of the regular icosahedron and dodecahedron.
(14) We have found that E1-E2 heterodimers, which form the virus protomeric units, exist in two conformationally distinct forms, reflecting their nonequivalent positions in the icosahedron.
(15) The model capsid is defined by the underlying icosahedron, of edge 445 A, upon which hexons are arranged.
(16) The virus was sensitive to the action of lipid solvents and trypsin and was rapidly inactivated at pH 3.0 and at temperatures of 50 and 56 C. The virion, an icosahedron consisting of a nucleoid surrounded by a double membrane, measured approximately 135 nm in diameter.
(17) Protein-protein associations have been identified which participate in the formation of the icosahedron and these associations are stabilized by intramolecular disulfide bridges (Anthony, R. P., and Brown, D. T., 1990, J. Virol.
(18) The measured relative dimensions of the different heads fit best the relative dimensions predicted by a quasi-icosahedral model in which the smallest T4 head corresponds to an icosahedron with a triangulation number T = 21.
(19) These phages contain 2-DNA, their head is a regular icosahedron, the tail consisting of a helix of protein subunits is attached to the head by a narrowed segment and is fixed in it by means of a disc-like structure.
(20) This can be explained in terms of icosahedron and cuboctahedron type clusters deposited on the surface of the carbon layer.