| immune precipitation | <immunology> The precipitation of a multivalent antigen by a bivalent antibody, resulting in the formation of a large complex. The antibody and antigen must be soluble. Precipitation usually occurs when there is near equivalence between antibody and antigen concentrations. (18 Nov 1997) |
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| ammonium sulphate precipitation | <technique> In this technique, ammonium sulphate is used to make proteins precipitate out of a solution, the proteins are then collected by centrifugation. (09 Oct 1997) |
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| capsular precipitation reaction | Swelling of the capsule surrounding a bacterium as a result of interaction with anticapsular antibody, consequently the capsule becomes more refractile and conspicuous. (18 Nov 1997) |
| precipitation | The act or process of precipitating. Origin: L. Praecipitatio (18 Nov 1997) |
| precipitation curve | A graph of the quantity of precipitate formed as a function of the quantity of antigen added during the titration of an antibody with an antigen. Synonym: Heidelberger curve. (05 Mar 2000) |
| precipitation test | An in vitro test in which antigen is in soluble form and precipitates when it combines with added specific antibody in the presence of an electrolyte. See: gel diffusion precipitin tests, ring precipitin test. Synonym: precipitation test. (05 Mar 2000) |
| hapten inhibition of precipitation | Inhibition of precipitation that occurs when the precipitin has combined with hapten of the same specificity as the subsequently added antigen. (05 Mar 2000) |
| double antibody precipitation | A method of separating antibody-bound antigen (e.g., insulin) from free antigen by precipitating the former with antibody specific for immunoglobulin. Synonym: double antibody immunoassay, double antibody method. (05 Mar 2000) |
| isopropanol precipitation test | A test using the principle that the internal bonds of haemoglobin are weakened by nonpolar solvents; thus, unstable haemoglobins will precipitate more rapidly than other haemoglobins in isopropanol. (05 Mar 2000) |
| rabies immune globulin | Globulin fraction of pooled plasma of high anti-rabies virus titre from immunised persons. Synonym: rabies immunoglobulin. (05 Mar 2000) |
| measles immune globulin | A sterile solution of globulin's derived from the blood plasma of normal adult human donors; it is prepared from immune serum globulin that complies with the measles antibody reference standard; a passive immunizing agent. Synonym: measles immunoglobulin. (05 Mar 2000) |
| cellular immune theory | A concept, put forth by Elie Metchnikoff, that cells, not antibodies, were responsible for the immune response of an organism. (05 Mar 2000) |
| rho(d) immune globulin | Immunizing agent containing IgG anti-rho(d) used for preventing rh immunization in rh-negative individuals exposed to rh-positive red blood cells. (12 Dec 1998) |
| chickenpox immune globulin | Globulin fraction of serum from persons recently recovered from herpes zoster infection; used to prevent infection of high-risk children. Synonym: chickenpox immunoglobulin. (05 Mar 2000) |
| pertussis immune globulin | A sterile solution of globulin's derived from the plasma of adult human donors who have been immunised with pertussis vaccine; used both prophylactically and therapeutically. Synonym: pertussis immunoglobulin. (05 Mar 2000) |
| poliomyelitis immune globulin | A sterile solution of globulin's that contains those antibodies normally present in adult human blood; it is a passive immunologic agent that attenuates or prevents poliomyelitis, measles, and infectious hepatitis, and confers temporary but significant protection against paralytic polio. Synonym: poliomyelitis immunoglobulin. (05 Mar 2000) |