As they combine this results in a multimolecular lattice that increases in size until precipitate out of solution. In this case each antibody must have at least two binding sites and antigen must be multivalent. Precipitation is the result of antibody binding to more than one antigen and vice versa, forming a stable network or lattice.
Precipitate, as a verb, can also mean specifically, 'to fall from clouds,' such as rain, snow, or other forms of precipitation. An unpopular verdict might ' precipitate violence' or one false step at the Grand Canyon could precipitate you down into the gorge. The zone in which optimum precipitation occurs is called the zone of equivalence, in which the number of multivalent sites of antigen and antibody are approximately equal. Precipitate usually means 'bringing something on' or 'making it happen' and not always in a good way. In addition to the affinity and avidity of the antibody involved, precipitation depends on the relative proportions of antigen and antibody present.At the other side of the zone, where there is antigen excess, the postzone phenomenon occurs, in which small aggregates are surrounded by excess antigen, and again no lattice network is formed. late 15c., precipitacioun, 'a casting down' (of the evil angels from heaven), also, in alchemy 'separation of a solid substance from a solution,' from Old French precipitation (15c. In the case of antibody excess, the prozone phenomenon occurs, in which antigen combines with only one or two antibody molecules, and so no cross-linkages are formed. On either side of the equivalence zone, precipitation is actually prevented because of an excess of either antigen or antibody.
Since lifting of air masses is the cause of almost all ppt, amount and frequency. The phenomenon of clumping of proteins in serum produced by the addition of a specific precipitin.
Therefore, ppt tends to be heavier near coastlines. From Longman Dictionary of Contemporary EnglishRelated topics: Chemistryprecipitateprecipitate1 /prsptet/ verb 1 transitive formalCAUSE to make. The process of formation of a solid previously held in solution or suspension in a liquid. Main source of moisture for ppt is evaporation from oceans. Precipitation Curve (Prozone and Postzone) Heavy precipitation occurs near the equator and decreases with the increase in the latitude i.e.
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