| abortive transduction | Transduction in which the genetic fragment from the donor bacterium is not integrated in the genome of the recipient bacterium, and, when the latter divides, is transmitted to only one of the daughter cells. (05 Mar 2000) |
|---|---|
| general transduction | Transduction in which the transducing bacteriophage is able to transfer any gene of the donor bacterium. (05 Mar 2000) |
| complete transduction | Transduction in which the transferred genetic fragment is fully integrated in the genome of the recipient bacterium. (05 Mar 2000) |
| high frequency transduction | Specialised transduction in which the donor bacterium contains not only the transducing, defective probacteriophage but also nondefective prophage that serves as "helper" virus, enabling most of the defective prophage particles to develop sufficiently to function as transducing agents. (05 Mar 2000) |
| signal transduction | The cascade of processes by which an extracellular signal (typically a hormone or neurotransmitter) interacts with a receptor at the cell surface, causing a change in the level of a second messenger for example calcium or cyclic AMP) and ultimately effects a change in the cells functioning (for example: triggering glucose uptake or initiating cell division). Can also be applied to sensory signal transduction, for example of light at photoreceptors. (18 Nov 1997) |
| specialised transduction | Transduction in which the bacteriophage strain is able to transfer only some, or only one, of the donor bacterium genes. Synonym: specific transduction. (05 Mar 2000) |
| specific transduction | Transduction in which the bacteriophage strain is able to transfer only some, or only one, of the donor bacterium genes. Synonym: specific transduction. (05 Mar 2000) |
| transduction | 1. <molecular biology> The transfer of a gene from one bacterium to another by a bacteriophage. In generalised transduction any gene may be transferred as a result of accidental incorporation during phage packaging. In specialised transduction only specific genes can be transferred, as a result of improper recombination out of the host chromosome of the prophage of a lysogenic phage. Transduction is an infrequent event but transducing phages have proved useful in the genetic analysis of bacteria. 2. <biology, physics> The conversion of a signal from one form to another. For example: various types of sensory cells convert or transduce light, pressure, chemicals, etc. Into nerve impulses and the binding of many hormones to receptors at the cell surface is transduced into an increase in cAMP within the cell. (17 Mar 1998) |
| transduction, genetic | Transfer of bacterial DNA by phages from the infected bacterium in which the DNA originates to another bacterium. (12 Dec 1998) |
| low frequency transduction | Specialised transduction in which only a small portion of the prophage particles, because of their defectiveness, are able to develop sufficiently to serve as effective transducing agents. (05 Mar 2000) |
| adhesion structures linked tyrosine kinase | <enzyme> Isolated from mouse embryonic stem cells Registry number: EC 2.7.1.- Synonym: hyk protein (26 Jun 1999) |
| benzylviologen-linked aldehyde oxidoreductase | <enzyme> A coenzyme a-independent tungsten-containing aldehyde oxidoreductase; from desulfovibrio gigas; n-terminal amino acid sequence given in first source Registry number: EC 1.2.7.- Synonym: bv-aldh (26 Jun 1999) |
| recessive, x-linked | A gene on the X chromosome that expresses itself only when there is no different gene present at that locus (spot on the chromosome). For example, duchenne muscular dystrophy (dmd) is an x-linked recessive disorder. A dmd boy has the dmd gene on his sole x chromosome (and so is said to be hemizgous for dmd). Although it is much rarer, a girl can have dmd (by several different means as, for example, if she has the dmd gene on both her x chromosomes and so is homozygous for dmd). (12 Dec 1998) |
| x-linked | On the X chromosome. Linked in genetics does not mean merely associated. An x-linked gene travels with the x chromosome and therefore is part of the x chromosome. (12 Dec 1998) |
| X linked disease | <disease, genetics> A genetic or inherited disease whose controlling gene or at least part of the relevant genome is carried on an X chromosome, for example haemophilia. most known conditions are recessive and thus since males have only one X chromosome they will express any such recessive character. Few dominants are known and the homozygous states are very rare so that female expression of such diseases is uncommon. (18 Nov 1997) |