| Ehrlich's diazo reaction | The reaction of diazotised sulfanilic acid with bilirubin to form azobilirubin, which forms the basis of quantitating the amount of bilirubin in biological fluids. See: van den Bergh's test. Synonym: Ehrlich's diazo reaction. (05 Mar 2000) |
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| transfusion reaction | A reaction to a blood transfusion secondary to some incompatibility in type, RH factor or other surface antigens. May be manifest by haemolytic anaemia, heart failure, and-or renal failure. Symptoms include facial flushing, angioedema, headache, wheezing, anaphylaxis, shock, fever, chills and breathing difficulty. (27 Sep 1997) |
| transplantation reaction | <immunology> The set of cellular phenomena observed after an allogeneic (mismatched) graft is made to an organism that leads to destruction, detachment or isolation of the graft. In mammals this includes the invasion and destruction of the graft by cytotoxic lymphocytes, inhibition of angiogenesis and other processes. (18 Nov 1997) |
| Treponema pallidum immobilization reaction | A test for syphilis in which an antibody other than Wassermann antibody is present in the serum of a syphilitic patient, which in the presence of complement causes the immobilization of actively motile Treponema pallidum obtained from testes of a rabbit infected with syphilis. Synonym: TPI test, Treponema pallidum immobilization reaction. (05 Mar 2000) |
| eosinopenic reaction | Reduction in the numbers of circulating eosinophils by ACTH or by adrenal corticoids. (05 Mar 2000) |
| triketohydrindene reaction | <technique> A technique for detecting amino acids and proteins by heating a material with ninhydrin, if amino molecules are present, there is a colour reaction. (09 Oct 1997) |
| erythrophore reaction | A reddish colouration (nuptial colouration) caused in certain male fishes (bitterling) by the injection of the gonad hormone. Synonym: fish test. (05 Mar 2000) |
| escape reaction | Innate response elicited by sensory stimuli associated with a threatening situation, or actual confrontation with an enemy. (12 Dec 1998) |
| etard reaction | <biochemistry> In organic chemistry, this involves oxidizing methylated homologs of benzene into aromatic aldehydes. The reaction uses chromyl chloride. (09 Oct 1997) |
| Jaffe reaction | A bright orange-red complex resulting from the treatment of creatinine with alkaline picrate solution; the basis of most routine creatinine tests. (05 Mar 2000) |
| Jarisch-Herxheimer reaction | An inflammatory reaction in syphilitic tissues (skin, mucous membrane, nervous system, or viscera) induced in certain cases by specific treatment with Salvarsan, mercury, or antibiotics; believed to be due to a rapid release of treponemal antigen with an associated allergic reaction in the patient. Synonym: Jarisch-Herxheimer reaction. (05 Mar 2000) |
| Jolly's reaction | Rapid loss of response to faradic stimulation of a muscle with the galvanic response and the power of voluntary contraction retained. Synonym: myasthenic reaction. (05 Mar 2000) |
| eye-closure pupil reaction | A constriction of both pupils when an effort is made to close eyelids forcibly held apart. A variant of the pupil response to near vision. Synonym: Galassi's pupillary phenomenon, Gifford's reflex, lid-closure reaction, orbicularis phenomenon, orbicularis pupillary reflex, Piltz sign, Westphal's pupillary reflex, Westphal-Piltz phenomenon. (05 Mar 2000) |
| false-negative reaction | <statistics> An erroneous or mistakenly negative response. Negative test results in subjects who possess the attribute for which the test is conducted. The labeling of diseased persons as healthy when screening in the detection of disease. (05 Mar 2000) |
| false-positive reaction | <statistics> An erroneous or mistakenly positive response. Positive test results in subjects who do not possess the attribute for which the test is conducted. The labeling of healthy persons as diseased when screening in the detection of disease. (05 Mar 2000) |