| AA ex | active assistive exercise |
|---|---|
| AAR | active avoidance reaction; acute articular rheumatism; antigen-antiglobulin reaction |
| AB | abdominal; abnormal; abortion; Ace bandage; active bilaterally; aid to the blind; alcian blue; alert... |
| A-CAH | autoimmune chronic active hepatitis |
| ACD | absolute cardiac dullness; absolute claudication distance; acid-citrate-dextrose [solution]; actinom... |
| immunotherapy, active | Active immunization where vaccine is administered for therapeutic or preventive purposes. This can include administration of immunopotentiating agents such as bcg vaccine and corynebacterium parvum as well as biological response modifiers such as interferons, interleukins, and colony-stimulating factors in order to directly stimulate the immune system. (12 Dec 1998) |
|---|---|
| optically active | <chemistry> A material which can rotate plane-polarized light. (09 Jan 1998) |
| tensio active | Having an effect on surface tension. (18 Nov 1997) |
| anospinal centre | The centre in the spinal cord that controls the contraction of the anal sphincter. (05 Mar 2000) |
| asymmetric centre | <chemistry> Same as a chiral centre, a tetrahedral carbon atom that bears four different substituents. (09 Jan 1998) |
| Broca's centre | The posterior part of the inferior frontal gyrus of the left or dominant hemisphere, corresponding approximately to Brodmann's area 44; Broca identified this region as an essential component of the motor mechanisms governing articulated speech. Synonym: Broca's area, Broca's field, motor speech centre. (05 Mar 2000) |
| Budge's centre | The preganglionic motor neurons in the first thoracic segment of the spinal cord which give rise to the sympathetic innervation of the dilator muscle of the eye's pupil. Synonym: Budge's centre. (05 Mar 2000) |
| vasomotor centre | Diffuse area of the reticular formation in the lateral medulla containing neurons that control vascular tone; consists of separate vasodepressor and vasopressor areas. (05 Mar 2000) |
| reaction centre | <plant biology> The site in the chloroplast that receives the energy trapped by chlorophyll and accessory pigments and initiates the electron transfer process. A photosynthetic complex containing chlorophyll (or bacteriochlorophyll) and other components, within which occurs the initial electron transfer reactions of photophosphorylation. (09 Oct 1997) |
| germinal centre | Areas within lymph nodes where B lymphocytes rapidly divide. (09 Oct 1997) |
| germinal centre kinase | <enzyme> A human ste20 homolog; mw 97 kD; has been sequenced Registry number: EC 2.7.10.- Synonym: germinal centre kinase gck, gc kinase, bl44 gene product (26 Jun 1999) |
| germinal centre of Flemming | The lightly staining centre in a lymphatic nodule in which the predominant cells are large lymphocytes and macrophages. Synonym: reaction centre. (05 Mar 2000) |
| catalytic centre | See: active centre. (05 Mar 2000) |
| cell centre | Microtubule organising centre of the cell, the pericentriolar region. (18 Nov 1997) |
| vital centre | Centre essential to life; usually refers to the centres located in the medulla oblongata which are necessary for the maintenance of respiration and circulation. (05 Mar 2000) |