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2 天前 · Wikipedia, free Internet-based encyclopaedia, started in 2001, that operates under an open-source management style. It is overseen by the nonprofit Wikimedia Foundation. Wikipedia uses a collaborative software known as wiki that facilitates the creation and development of articles. Although some highly publicized problems have called attention ...
- The Editors of Encyclopaedia Britannica
4 天前 · Pres. Franklin Pierce signed An Act to Organize the Territories of Nebraska and Kansas into law on May 30, 1854. Compromises over extension of slavery into U.S. territories. Written in an effort to arrest the escalating sectional controversy over the extension of slavery, the Kansas-Nebraska Act ironically fanned the flame of national division.
- The Editors of Encyclopaedia Britannica
2024年4月12日 · Virus, infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. Viruses possess unique infective properties and thus often cause disease in host organisms. Learn about the history, types, and features of viruses.
- A virus is an infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria.
- A virus particle is made up of genetic material housed inside a protein shell, or capsid. The genetic material, or genome, of a virus may consist o...
- Most viruses vary in diameter from 20 nanometres (nm; 0.0000008 inch) to 250–400 nm. The largest viruses measure about 500 nm in diameter and are a...
- Shapes of viruses are predominantly of two kinds: rods (or filaments), so called because of the linear array of the nucleic acid and the protein su...
- When some disease-causing viruses enter host cells, they start making new copies of themselves very quickly, often outpacing the immune system’s pr...
