| CA | anterior commissure [Lat. commissura anterior]; calcium antagonist; California [rabbit]; cancer; Can... |
|---|---|
| DHA | dehydroacetic acid; dehydroascorbic acid; dehydroepiandrosterone; dihydroacetic acid; dihydroxyaceto... |
| FA | false aneurysm; Families Anonymous; Fanconi anemia; far advanced; fatty acid; febrile antigen; femor... |
| GA | Gamblers Anonymous; gastric analysis; gastric antrum; general anesthesia; general angiography; gener... |
| IAA | imidazoleacetic acid; indoleacetic acid; infectious agent, arthritis; insulin autoantibody; Internat... |
| chemical reaction | <chemistry> A process in which one or more substances are changed chemically into one or more different substances. (09 Oct 1997) |
|---|---|
| periosteal reaction | <radiology> In adults: hypertrophic osteoarthropathy (HOA), pachydermoperiostosis, vascular insufficiency, thyroid acropachy, fluorosis in kids: physiologic periostosis, Caffey disease, JRA, acute leukaemia, scurvy, rickets, congenital syphilis, hypervitaminosis A (12 Dec 1998) |
| periosteal reaction patterns | <radiology> Pattern most indicative of buttressing eosinophilic granuloma laminated Ewing sarcoma or hair-on-end Codman triangle osteo- or chondrosarcoma or sunburst (per Resnick) (12 Dec 1998) |
| peroxidase reaction | Formation of indophenol blue by the action of an oxidizing enzyme present in certain cells and tissues when they are treated with a solution of alpha-naphthol and dimethylparaphenylenediamine; by this method, cells of the myelocyte series, which give a positive reaction, may be distinguished from those of the lymphocyte series, which give a negative reaction; endothelial leukocytes give a variable reaction, probably positive when they have phagocytised the debris of myeloid cells. Synonym: Nadi reaction. (05 Mar 2000) |
| group reaction | A reaction with an agglutinin or other antibody that is common (though usually in varying concentrations) to an entire group of related bacteria, e.g., the coli group. (05 Mar 2000) |
| Gruber's reaction | Agglutination reaction as applied to the diagnosis of typhoid. Synonym: Gruber's reaction, Gruber-Widal reaction. (05 Mar 2000) |
| Gruber-Widal reaction | Agglutination reaction as applied to the diagnosis of typhoid. Synonym: Gruber's reaction, Gruber-Widal reaction. (05 Mar 2000) |
| cholera-red reaction | A test for cholera vibrio whereby the addition of 3 or 4 drops of sulfuric acid (concentrated, chemically pure) to an 18-hour-old bouillon or peptone culture of the organism produces a colour from rose-pink to claret. (05 Mar 2000) |
| Gunning's reaction | The formation of iodoform from acetone by iodine and ammonia in alcohol. (05 Mar 2000) |
| chromaffin reaction | Production of a yellow-brown to brown colouration in normal and abnormal cells containing epinephrine and norepinephrine, when fresh tissue slices are placed in a dichromate-chromate mixture overnight; useful for detection of pheochromocytoma (adrenal medulla) and other tumours which produce catecholamines. (05 Mar 2000) |
| circular reaction | In sensorimotor theory, the tendency of an organism to repeat novel experiences. (05 Mar 2000) |
| phosphoroclastic reaction | Cleavage of C-C bonds that involves phosphate transfer but not, as in phosphorolysis, directly to one of the products; e.g., the decomposition of pyruvate to acetate + CO2, in which Pi is added to ADP to form ATP. (05 Mar 2000) |
| Millon reaction | The reaction of phenolic compounds (e.g., tyrosine in protein) with Hg(NO3)2 in HNO3 (and a trace of HNO2) to give a red colour. (05 Mar 2000) |
| photosynthetic reaction centre, bacterial | A system consisting of proteins and cofactors which acts as a light-driven electron pump across the photosynthetic membrane of photosynthetic bacteria. (12 Dec 1998) |
| photosynthetic reaction centre, plant | A system consisting of proteins and cofactors which facilitates light energy and electron transfer in plants. (12 Dec 1998) |