The Journal of General Physiology
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The Journal of General Physiology, Vol 5, 127-138, Copyright © 1922 by The Rockefeller University Press

ARTICLE

THE STABILITY OF BACTERIAL SUSPENSIONS

IV. THE COMBINATION OF ANTIGEN AND ANTIBODY AT DIFFERENT HYDROGEN ION CONCENTRATIONS.



Paul H. De Kruif 1 and John H. Northrop 1

1 From the Laboratories of The Rockefeller Institute for Medical Research.

1. The amount of immune body required to agglutinate a suspension of Bacillus typhosus increases in direct proportion to the concentration of the suspension.

2. The amount of immune body combined with the organisms is constant from pH 9 to pH 3.7. Below the latter value the amount in combination is decreased.

3. The addition of immune serum to a suspension of Bacillus typhosus at a pH of 2,5 increases the positive charge of the organisms.

These results are contradictory to the idea that the combination is caused by a difference in the sign of the charge carried by the immune body and the organism. They agree with the assumption that the immune body forms a film on the surface of the organism and that the effect on the charge is the result of this film.

Submitted on September 21, 1922


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