Topic: virus

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virus

The Columbia Encyclopedia, Sixth Edition
virus parasite with a noncellular structure composed mainly of nucleic acid within a protein coat. Viruses usually are too small (100-2,000 Angstrom units) to be seen with the light microscope and thus must be studied by electron microscopes. In one stage of their life cycle, in which they are free and infectious, virus particles do not carry out the functions of living cells, such as respiration and growth; in the other stage, however, viruses enter living plant, animal, or bacterial cells and make use of the host cell's chemical energy and its protein- and nucleic acid-synthesizing ability... Read more
Variola Virus
Encyclopedia of Espionage, Intelligence, and Security Variola Virus █ JULI BERWALD Variola virus (or variola major ) is the virus that causes smallpox. The virus is one of the members of the poxvirus group ( Poxviridae ) and it is one of the most complicated animal viruses. The variola virus ... Read more
computer virus
The Columbia Encyclopedia, Sixth Edition computer virus rogue computer program , typically a short ... computers' normal operations. A computer virus usually attaches or inserts itself to or ... five new strains are discovered every day. Virus programs can also infect advanced cellular ... Read more

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