icosahedral symmetry

1

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 ) .

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）。
2

The capsids of nearly all spherical viruses adopt icosahedral symmetry .

二十面体病毒衣壳结构蛋白具有不同的构象。
3

Purified virus was nonenveloped , icosahedral symmetry with a triangulation number of 3 , and 33 ~ 37nm in diameter .

该病毒粒子无囊膜，呈20面体对称，直径一般为33～37nm。
4

Negative-contrast examination showed nucleocapsids 56.06 ± 2.42 nm in diameter , icosahedral symmetry and with clearly discernible capsomere structures , and cores 38.36 ± 2.42 nm in diameter .

核衣壳具有环状病毒特有的20面体对称结构，直径为56.06±2.42nm。