痔瘡出血怎麼辦 相關
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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
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...
4 天前 · Kansas-Nebraska Act, in the antebellum period of U.S. history, critical national policy change concerning the expansion of slavery into the territories, affirming the concept of popular sovereignty over congressional edict. In 1820 the Missouri Compromise had excluded slavery from that part of the Louisiana Purchase (except Missouri) north of the 36 30′ parallel.
