A polysaccharide antigen extending from the outer membrane of some gram-negative bacterial cell walls; it is part of the lipopolysaccharide.

Microbiology. . 2009.

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  • O antigen — n an antigen that occurs in the body of a gram negative bacterial cell called also somatic antigen compare H ANTIGEN * * * [ohne Hauch, q.v.] the lipopolysaccharide protein somatic antigens of gram negative bacteria, important in the serological… …   Medical dictionary

  • o antigen — ˈō noun Usage: usually capitalized O Etymology: German, from ohne hauch antigen, from ohne hauch without breath + antigen : somatic antigen …   Useful english dictionary

  • Antigen-Antikörper-Reaktion — Als Antigen Antikörper Reaktion wird in der Biochemie, der Immunologie und in verwandten Wissenschaften ein Bestandteil der Immunreaktion bezeichnet, bei dem sich ein Komplex aus Antigen und Antikörper bildet. Dieser wird als Antigen Antikörper… …   Deutsch Wikipedia

  • O — 1. Symbol for oxygen; orotidine. 2. Abbreviation for opening (in formulas for electrical reactions). 3. Symbol for a blood group in the ABO system. See ABO blood group, Blood Groups appendix. 4. An abbreviation derived from ohne Hauch (without a… …   Medical dictionary

  • antigen — Any substance that, as a result of coming in contact with appropriate cells, induces a state of sensitivity and/or immune responsiveness after a latent period (days to weeks) and that reacts in a demonstrable way with antibodies and/or immune… …   Medical dictionary

  • o substance — noun Usage: usually capitalized O : an antigen characteristic of red blood cells of persons of blood group O …   Useful english dictionary

  • O agglutination — the agglutination of bacteria in the presence of antibody to the heat stable somatic antigen …   Medical dictionary

  • O agglutinin — see under antigen …   Medical dictionary

  • antigen — Synonyms and related words: Rh factor, Rh negative, Rh positive, Rh type, Rhesus factor, acquired immunity, active immunity, agglutinin, allergen, anaphylactin, antiantibody, antibody, antiserum, antitoxic serum, antitoxin, antivenin, arterial… …   Moby Thesaurus

  • H antigen — āch n any of various antigens associated with the flagella of motile bacteria and used in serological identification of various bacteria called also flagellar antigen compare O ANTIGEN * * * [Hauch, q.v.] 1. the precursor of the A and B blood… …   Medical dictionary

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