precipitin

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precipitin

 [pre-sip´ĭ-tin]
an antibody to antigen that specifically aggregates the antigen in vivo or in vitro to give a visible precipitate.
precipitin reaction a reaction involving the specific serologic precipitation of an antigen in solution with its specific antiserum in the presence of electrolytes. The reaction is used in the typing of pneumococcus strains, in testing whether blood is human or animal, and for diagnostic purposes.
precipitin test any test in which the positive reaction consists of the formation and deposit of a precipitate in the fluid being tested. See also precipitin reaction.

pre·cip·i·tin

(prē-sip'i-tin),
An antibody that under suitable conditions combines with and causes its specific and soluble antigen to precipitate from solution.

precipitin

/pre·cip·i·tin/ (-sip´it-in) an antibody to soluble antigen that specifically aggregates the macromolecular antigen in vivo or in vitro to give a visible precipitate.

precipitin

(prĭ-sĭp′ĭ-tĭn)
n.
An antibody that reacts with a specific soluble antigen to produce a precipitate.

precipitin

[prəsip′itin]
Etymology: L, praecipitare + Gk, anti, against; AS, bodig, body; Gk, genein, to produce
an antibody that causes the formation of an insoluble complex when combined with a specific soluble antigen. Compare agglutinin. See also agglutination, antiglobulin.

pre·cip·i·tin

(prĕ-sip'i-tin)
An antibody that under suitable conditions combines with and causes its specific and soluble antigen to precipitate from solution.

precipitin

see ANTIBODY.

Precipitin

An antibody in blood that combines with an antigen to form a solid that separates from the rest of the blood.

precipitin

an antibody to soluble antigen that specifically aggregates the antigen in vivo or in vitro to give a visible precipitate.

precipitin curve
a plot showing the amount of antibody precipitated with increasing amounts of antigen added in a precipitin reaction.
precipitin reaction, precipitin test
a reaction involving the specific precipitation of an antigen in solution by mixing with a specific antiserum in the presence of electrolytes. See also lattice theory.