| stringent factor | The gene product (an enzyme) that is crucial to the cellular response of decreased ribosome production as a result of amino acid starvation. See: stringent response. (05 Mar 2000) |
|---|---|
| stringent plasmid | <molecular biology> A plasmid that only replicates along with the main bacterial chromosome and is present as a single copy, or at most several copies, per cell. (16 Dec 1997) |
| stringent response | The cellular response to amino acid starvation that reduces the amount of ribosomes to what can be employed under the nutrient conditions. (05 Mar 2000) |
| brucella strain 19 vaccine | A live bacterial vaccine prepared from an attenuated variant strain of Brucella abortus (strain 19); used for vaccinating cattle against brucellosis. (05 Mar 2000) |
| recombinant strain | <molecular biology> A cell or an individual with a new combination of genes not found together in either parent, usually applied to linked genes. (18 Nov 1997) |
| carrier strain | A bacterial strain that is contaminated with a bacteriophage of low infectivity. Synonym: pseudolysogenic strain. (05 Mar 2000) |
| cell strain | <cell culture> Cells adapted to culture, but with finite division potential. See: cell line. (26 Mar 1998) |
| voice strain | The development of hoarse voice secondary to overuse. (27 Sep 1997) |
| rough strain | <microbiology> Bacterial strains that have altered outer cell wall carbohydrate chains causing colonies on agar to change their appearance from smooth to dull. In Streptococci the smooth strains are virulent whereas the rough strains are not. This is partly because the rough strains are much more readily phagocytosed. (17 Dec 1997) |
| wild strain | <virology> A viral strain found naturally, as opposed to one created in the laboratory. (09 Oct 1997) |
| wild-type strain | A strain found in nature or a standard strain. See: auxotrophic strains, prototrophic strains. (05 Mar 2000) |
| congenic strain | An inbred strain of animals produced by continued crossing of a gene of one line onto another inbred (isogenic) line. (05 Mar 2000) |
| muscle strain | An acute tearing injury to muscle. Usually associated with a small amount of bleeding (haematoma) into the injured muscle tissue. (27 Sep 1997) |
| crippled strain | <microbiology> A strain of bacteria, typically highly pathogenic, that has been genetically engineered so that it cannot survive on anything but a veryspecialised medium of nutrients, this is done so that geneticists can experiment on certain pathogens without the risk that they will escape fromthe lab. (09 Oct 1997) |
| HFR strain | A strain, or clone, in which a conjugative plasmid (such as an F'), integrated in the bacterial genome, is instrumental in the transfer (along with plasmid DNA) of integrated bacterial DNA in a sequential manner to a suitable recipient. Origin: high freguency of recombination (05 Mar 2000) |