| 释义 |
precipitin Biol. Chem.|prɪˈsɪpɪtɪn|
[irreg. f. base of precipit-ate + -in1.]
a. An antibody that on reacting with its antigen produces a visible precipitate. Also fig.
1900Lancet 14 July 99/1 Experiments..with the precipitins of egg albumen and sheep's globulin were made, and in this case also one or other of the precipitins disappeared. 1903Brit. Med. Jrnl. 21 Mar. 655 The same explanations hold good for the action of the..precipitins, namely those substances in immune serums which cause precipitation when added to the fluids or solutions of substances used in immunization. 1904[see precipitating ppl. a. 6]. 1912[see immunologist]. 1931Syst. Bacteriol. (Med. Res. Council) VI. xiii. 424 Kraus named the substance present in the bacterial filtrate precipitinogen while the term precipitin was used to denote the hypothetical substance or antibody formed or set free in the animal body in response to injections of an antigen or precipitinogen. 1966Lancet 24 Dec. 1397/1 Some natives in the Territory of Papua and New Guinea who have chronic lung disease also have in their sera precipitins against a soluble substance in the roofs of their huts. 1971‘D. Halliday’ Dolly & Doctor Bird xiii. 192, I don't think any of us felt anything: we carried our own precipitins, for the moment, against fear and danger.
b. attrib., as precipitin reaction, precipitin technique; precipitin test, a means of establishing the identity of a substance by testing whether it reacts with a particular precipitin; hence precipitin testing vbl. n.
1958Immunology I. 87 Quantitative studies of the precipitin and agglutination reactions. 1962M. Rabaey in A. Pirie Lens Metabolism Rel. Cataract 310 Generally, α-crystallin has been the first lens protein which has been detected by means of precipitin techniques.
1905F. C. Wood Chem. & Microsc. Diagnosis i. ix. 255 Before applying the precipitin test to a suspected stain, the presence of blood should, if possible, be determined either by the formation of Teichmann's crystals or by the spectroscope. 1952M. E. Florey Clin. Applic. Antibiotics I. ii. 31 They..found precipitin tests inconclusive and considered in consequence that the urticaria was not the result of an antibody-antigen reaction. 1976Lancet 6 Nov. 985/1 Antibodies to thyroglobulin were detected by a precipitin test in an Ouchterlony plate.
1971E. Afr. Standard (Nairobi) 13 Apr. 9/8 This will form the basis of establishing precipitin testing for East Africa. |