| expression library | <molecular biology> A library of DNA fragments which was created with an expression vector so that any genes present in the library are expressed. (09 Oct 1997) |
|---|---|
| expression site | The location in the genome of the gene for the variable surface glycoprotein that is currently being expressed (an expression-linked copy) by the trypanosome (a parasitic protozoan which causes the disease African sleeping sickness). most of these sites are near the ends, or telomeres, of a chromosome. (09 Oct 1997) |
| expression system | <molecular biology> Combination of an expression vector, its cloned DNA, and the host for the vector that provide a context to allow foreign gene function in a host cell, that is, produce proteins at a high level. (13 Nov 1997) |
| expression vector | <molecular biology> A cloning vector that contains the necessary regulatory sequences to allow transcription and translation of a cloned gene or genes and thus transcribe and clone DNA. (13 Nov 1997) |
| expression, gene | A gene speaks. When a gene is expressed, the information encoded in the gene is translated into protein or RNA structures present and operating in the cell. Expressed genes include genes that are transcribed into messenger RNA (mRNA) and then translated into protein as well as those genes that are transcribed into RNA (such transfer and ribosomal RNAs) but not translated into protein. (12 Dec 1998) |
| expression-linked copy | <molecular biology> One of many different versions of the variable surface glycoprotein gene of the trypanosome (a parasitic protozoan which causes the disease African sleeping sickness), refers to whichever one of them is currently being expressed on the outer surface of the trypanosome. (09 Oct 1997) |
| expressive aphasia | A type of aphasia in which there is a deficit in speech production or language output, often accompanied by a deficit in communicating by writing, signs, etc. The patient is aware of his impairment. Synonym: anterior aphasia, ataxic aphasia, Broca's aphasia, expressive aphasia, nonfluent aphasia. (05 Mar 2000) |
| expressivity | The consistency of a genetic disease. For example, Marfan disease shows variable expressivity. Some persons with Marfan's merely have long fingers and toes while others have the full-blown disease with dislocation of the lens and dissecting aneurysm of the aorta. (12 Dec 1998) |
| expressure | The act of expressing; expression; utterance; representation. "An operation more divine Than breath or pen can give expressure to." (Shak) Source: Websters Dictionary (01 Mar 1998) |
| expulsion, stage of | The part of labour from the full dilatation of the cervix until the baby is completely out of the birth canal. The second stage of labour. (12 Dec 1998) |
| expulsive | Tending to expel. Origin: L. Ex-pello, pp. -pulsus, to drive out (05 Mar 2000) |
| expulsive pains | Effective labour pain's, associated with contraction of the uterine muscle. (05 Mar 2000) |