(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.
Twenty
Definition:
(a.) One more that nineteen; twice; as, twenty men.
(a.) An indefinite number more or less that twenty.
(n.) The number next following nineteen; the sum of twelve and eight, or twice ten; twenty units or objects; a score.
(n.) A symbol representing twenty units, as 20, or xx.
Example Sentences:
(1) One hundred and twenty-seven states have said with common voice that their security is directly threatened by the 15,000 nuclear weapons that exist in the arsenals of nine countries, and they are demanding that these weapons be prohibited and abolished.
(2) Twenty-seven patients were randomized to receive either 50 mg stanozolol or placebo intramuscularly 24 h before operation, followed by a 6 week course of either 5 mg stanozolol or placebo orally, twice daily.
(3) Twenty patients with non-small cell bronchogenic carcinoma were prospectively studied for intrathoracic lymphadenopathy using computed tomography (CT) and magnetic resonance imaging (MRI).
(4) Twenty volunteers were used for the measurement of pedal pressures for 15 trials during three separate sessions.
(5) One hundred and twelve dogs, including twenty C3-deficient dogs, were studied over a period of 6 years.
(6) Twenty-nine patients had a marked organic tricuspid valvular disease.
(7) Four hundred and twenty-five lesions were dilated in 370 patients.
(8) Striated muscle fibres were found in each of twenty consecutive pineal glands cultured from individual neonatal rats.2.
(9) Twenty-seven human septums were removed at post mortem, examined macroscopically, sectioned coronally and examined microscopically.
(10) Twenty-one patients received 4.5 mg. per kilogram of intramuscular lidocaine and 25 patients received placebo in the deltoid muscle within 14 hours of the onset of symptoms.
(11) Twenty strains did not agglutinate with commercial serum O-Yersinia IMUNA; they were included in the group "Yersinia enterocolitica other biovars" and 60 strains were "Environmental Yersinia isolates".
(12) The results showed that twenty-eight bands were significantly rearranged (P less than 0.05).
(13) Twenty cases of advanced testicular tumors treated primarily by PVB therapy were reviewed.
(14) Lipoprotein(a) was discovered by chance by Berg in 1963; after twenty years of research, the chemical, physical and metabolic characteristics of Lp(a) are now known.
(15) Four of 18 patients showed no change over the twenty-four hours while 7 patients showed some variation without definite diurnal pattern.
(16) Heptathletes peak in their mid-to-late twenties – two Olympic cycles away yet for Johnson-Thompson – so what would she like to achieve in London?
(17) Twenty-nine deletion breakpoints were mapped in 220 kb of the DXS164 locus relative to potential exons of the Duchenne and Becker muscular dystrophy gene.
(18) Twenty-six contacts of 21 families were vaccinated, usually within three days after onset of the index cases.
(19) Twenty patients with central retinal vein occlusion were randomly divided into two groups in a prospective study to evaluate the effects of xenon are photocoagulation in central retinal vein occlusion.
(20) The twenty-five participants, from four different countries, were asked to rate each TC regarding its importance for teachers and whether they possessed them or needed further training.