Prions — short for proteinaceous infectious particle — are infectious self-reproducing protein structures.
Prion Diseases
These diseases
are transmissible — from host to host of a single species and, sometimes, even from one species to another (such as a laboratory animal)
destroy brain tissue giving it a spongy appearance ...
Prion
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prion protein
small, infectious proteinaceous particle, of non-nucleic acid composition because of its resistance to nucleases; the causative agent, either on a sporadic, genetic, or infectious basis, of six neurodegenerative diseases in animals, ...
Prion diseases, also referred to as transmissible spongiform encephalopathies, are characterized by the deposition of an abnormal isoform of the prion protein in the brain.
Prion-related protein (PrP): A normal protein, expressed in the nervous system of animals, whose structure when altered (by interaction with altered copies of itself) is the cause of scrapie in sheep, BSE in cattle, ...
prion
An infectious form of protein that may increase in number by converting related proteins to more prions.
probe ...
prions Infectious agents composed only of one or more protein molecules without any accompanying genetic information.
Prion. See Proteinaceous infectious particle.
Probe. A sequence of DNA or RNA, labeled or marked with a radioactive isotope, used to detect the presence of complementary nucleotide sequences. See Nucleotide.
The two that scientists have discovered are called prions and viroids. A prion is (as far as we know) just a protein. Prions are proteins that can invade cells and somehow direct their own duplication, making more of the isolated proteins.
The discovery of viroids, nucleic acid without a protein capsule, and prions, infectious proteins, subtracts another level of complexity. Both viroids and prions can cause diseases, the most famous of which is mad cow disease (caused by a prion).
Mutual symbiosis between clownfish of the genus Amphiprion that dwell among the tentacles of tropical sea anemones.
We are globalizing meat production, so that we've seen the foot and mouth disease and the prions with the mad cow disease from Europe. That is becoming a problem more and more all around the world. The United States has exported in food products E.
of metabolic activity, meaning that many scientists do not actually classify these structures as alive, due to their lack of at least one or more of the fundamental functions by which life is defined. They are classified as viruses, viroids, prions, ...
Viroids (meaning "viruslike") are disease-causing organisms that contain only nucleic acid and have no structural proteins. Other viruslike particles called prions are composed primarily of a protein tightly integrated with a small nucleic acid ...
 See also: Protein, Proteins, Trans, Cells, Human
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