二十面体对称

反复冻融3次后，收集细胞及培养液，电镜观察发现，病毒粒子无囊膜，有双层衣壳，呈正二十面体对称，将病毒命名为Bat/China/2003（B/03）。

After three times freeze-thaw , cells and culture medium were harvested for electron microscopy . Virus particles were nonenveloped , double capsid and icosahedral symmetry . This virus was designated Bat / China / 2003 ( B / 03 ) .

其核酸结构为线状双股DNA，衣壳为二十面体对称，有囊膜。

It has linear double strand DNA , icosahedral-capsid and envelope .

我们在十二面体框架的基础上，利用球面拉伸的方法，得到新的具有二十面体对称性，72个五边形构造的的多面体结构。

On the basis of the frame of dodecahedron , we apply the method of spherical stretching to the frame , we can obtain a novel polyhedron with I_h symmetry , which contains 72 pentagons .

由于正二十面体的对称壳层结构，离子动能分布具有尖峰结构。

Because of the symmetrical shell structure of the icosahedron , the distribution of the ionic kinetic energy features some pinnacles .

正二十面体和二十面体对称病毒

Icosahedron and Icosahedral Viruses

由此构建的二十面体准点阵结构模型有六个5-次轴，十个3-次轴和十五个2次轴，具有同正二十面体一样的点对称群5-3-2/m。

It is shown that the constructed model has six 5 - axes , ten 3 - axes and fifteen 2 axes . It has the same point group as an icosahedron , namely 5-3-2 / m.