| defective viruses | Viruses which lack a complete genome so that they cannot completely replicate or cannot form a protein coat. Some are host-dependent defectives, meaning they can replicate only in cell systems which provide the particular genetic function which they lack. Others, called satellite viruses, are able to replicate only when their genetic defect is complemented by a helper virus. (12 Dec 1998) |
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| ventral nervous system defective | <molecular biology> A Drosophila gene encoding an integral membrane glycoprotein related to amyloidogenic glycoprotein. (12 Jan 1998) |
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| defective | Denoting or exhibiting a defect; imperfect; a failure of quality. (05 Mar 2000) |
| defective bacteriophage | A temperate bacteriophage mutant whose genome does not contain all of the normal components and cannot become fully infectious virus, yet can replicate indefinitely in the bacterial genome as defective probacteriophage; many defective bacteriophage's are mediators of transduction. Synonym: defective phage. (05 Mar 2000) |
| defective interfering particle | An incomplete virus that is unable to replicate and interferes with replication of an infectious virus. (05 Mar 2000) |
| defective organism | Mutant with a nutritional requirement not present in the wild type organism. Synonym: defective organism, deficiency mutant. (05 Mar 2000) |
| defective phage | A temperate bacteriophage mutant whose genome does not contain all of the normal components and cannot become fully infectious virus, yet can replicate indefinitely in the bacterial genome as defective probacteriophage; many defective bacteriophage's are mediators of transduction. Synonym: defective phage. (05 Mar 2000) |
| defective probacteriophage | See: defective bacteriophage. (05 Mar 2000) |
| defective prophage | A temperate bacteriophage mutant whose genome does not contain all of the normal components and cannot become fully infectious virus, yet can replicate indefinitely in the bacterial genome as defective probacteriophage; many defective bacteriophage's are mediators of transduction. Synonym: defective phage. (05 Mar 2000) |
| defective virus | <virology> A virus genetically deficient in replication, but that may nevertheless be replicated when it co-infects a host cell in the presence of a wild type helper virus. most acute transforming retroviruses are defective, since their acquisition of oncogenes seems to be accompanied by deletion of essential viral genetic information. (18 Nov 1997) |
| african swine fever-like viruses | An unnamed, unclassified genus of DNA viruses with a single species: african swine fever virus. (12 Dec 1998) |
| alpha viruses | <virology> These are the major viruses in the Togavirus group and include eastern and western equine encephalitis viruses, the Sindbis virus and the Semliki Forest virus. The last two viruses are being researched as vectors for expressing heterologous genes. (09 Oct 1997) |
| animal viruses | Virus's occurring in man and other animals, causing inapparent infection or producing disease. (05 Mar 2000) |
| bunyamwera group viruses | A large group of viruses from many parts of the world assigned to the bunyavirus genus of the family bunyaviridae. They are transmitted by mosquitoes and infect humans in some areas. This group contains the type species of the genus, bunyamwera virus. (12 Dec 1998) |
| california group viruses | A group of viruses in the bunyavirus genus of the bunyaviridae family. They are found in temperate and arctic regions and each is closely associated with a single species of vector mosquito. The vertebrate hosts are usually small mammals but several virus species infect humans. (12 Dec 1998) |
| Capim viruses | A serologic group of the genus Bunyavirus, the type species of which is Capim virus. (05 Mar 2000) |