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louping ill
Science; General science
A viral disease of sheep, capable of producing central nervous system manifestations. It occurs chiefly in the British Isles. Infections have been reported, although rarely, ...
picornaviridae
Science; General science
A viral family made up of the small (18–30 nanometers) ether-sensitive viruses that lack an envelope and have a ribonucleic acid (RNA) genome. The name is derived from “pico” ...
newcastle disease
Science; General science
A viral infection that affects the digestive, intestinal, and respiratory tracts and the neurological system of birds. The causative agent is an enveloped ribonucleic acid (RNA) ...
parametric array
Science; General science
A virtual array of sources of sound in a fluid (more fully termed a parametric acoustic array) that is formed by two collinear acoustic waves propagating in the same direction, ...
respiratory syncytial virus
Science; General science
A virus belonging to the Paramyxoviridae, genus Pneumovirus . This virus, although unrelated to any other known respiratory disease agent and differing from the parainfluenza ...
defective virus
Science; General science
A virus that by mutation has lost the ability to be replicated in the host cell without the aid of a helper virus. The virus particles (virions) contain all the viral structural ...
obsidian
Science; General science
A volcanic glass, usually of rhyolitic composition, formed by rapid cooling of viscous lava. The color is jet-black because of abundant microscopic, embryonic crystal growths ...
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