Viruses: Definition, Structure, Classification

  title={Viruses: Definition, Structure, Classification},
  author={S. Modrow and Dietrich Falke and Uwe Truyen and Hermann M. Sch{\"a}tzl},
  journal={Molecular Virology},
  pages={17 - 30}
Viruses are infectious units with diameters of about 16 nm (circoviruses) to over 300 nm (poxviruses; Table 2.1). Their small size makes them ultrafilterable, i.e. they are not retained by bacteria-proof filters. Viruses have evolved over millions of years, and have adapted to specific organisms or their cells. The infectious virus particles, or virions, are composed of proteins and are surrounded in some species of viruses by a lipid membrane, which is referred to as an envelope; the particles… Expand

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