| host range mutant | A mutant of phage or animal virus that grows normally in one of its host cells, but has lost the ability to grow in cells of a second host type. (18 Nov 1997) |
|---|---|
| host restriction-modification | A bacterial system where the bacterium is able to destroy invading DNA from a bacteriophage (virus which infects bacteria) while at the same time preventing the destruction of their own DNA. The phage DNA is cleaved by a restriction enzyme made by the bacterium, the bacterial DNA is modified (usually with methylation) so that the enzyme will not destroy it. (09 Oct 1997) |
| host-vector system | A combination of a bacterial host cell (i.e. A specific strain) and a virus vector (i.e. A particular bacteriophage strain) which work well together for DNA cloning. (09 Oct 1997) |
| host versus graft reaction | The normal lymphocyte mediated reactions of a host against allogeneic or xenogeneic cells acquired as a graft or otherwise, which lead to damage or/and destruction of the grafted cells. The opposite of graft-versus-host reaction. The common basis of graft rejection. (18 Nov 1997) |
| host vs graft reaction | The immune responses of a host to a graft. A specific response is graft rejection. (12 Dec 1998) |
| dead-end host | A host from which infectious agents are not transmitted to other susceptible host's. (05 Mar 2000) |
| definitive host | <epidemiology> The host in which a parasite reproduces sexually. (05 Dec 1998) |
| disease, graft-versus-host | A reaction of donated bone marrow against a patient's own tissue. Also called GVHD. (12 Dec 1998) |
| intermediate host | <epidemiology> See vector. (05 Dec 1998) |
| transport host | An intermediate host in which no development of the parasite occurs, although its presence may be required as an essential link in the completion of the parasite's life cycle; e.g., the successive fish host's that carry the plerocercoid of Diphyllobothrium latum, the broad fish tapeworm, to larger food fish eventually eaten by man or other final host's. Synonym: transport host. (05 Mar 2000) |
| type host | <zoology> The host species with which the name-bearing type of a nominal species or subspecies was associated. (09 Jan 1998) |
| final host | <epidemiology> The host in which a parasite reproduces sexually. (05 Dec 1998) |