1887

Abstract

The cell concentration and possible biological activities of the pneumococcal Forssman (F) antigen (membrane lipoteichoic acid) were examined in a number of physiological situations. In test tube cultures of pneumococci the concentration of the Forssman antigen per bacterium showed no significant fluctuations within a typical culture cycle. Purified F antigen had no effect on the activation of pneumococci to competence for genetic transformation, DNA mediated genetic transformation or adsorption of the pneumococcal phage Dp-1 to bacteria. Pneumococci grown in the presence of different amino alcohols (ethanolamine, -monomethyl-ethanolamine, or choline) exhibit differences with regard to both their ability to stimulate heterophile (haemolytic) antibody production in rabbits and in their ability to bind such antibodies. Choline-grown bacteria seem to cross-react with sheep red blood cells better than do the analogue-grown bacteria.

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/content/journal/micro/10.1099/00221287-86-2-267
1975-02-01
2021-10-23
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