Studies on the Ultrastructure of Bordetella Pertussis. I. Morphology, Origin, and Biological Activity of Structures Present in the Extracellular Fluid of Liquid Cultures of Bordetella Pertussis
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General Medicine
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Two distinct particles have been recognized in the extracellular fluid of B. pertussis cultures. Both appeared to arise from the surface (cell wall) of the organism. One of these, a membranous particle, seemed to derive from long projections on the organism composed of the outer membrane of the cell wall. The second particle, a fine filament, was not readily comparable with any previously described bacterial structure. The two particles could be separated from each other by gradient centrifugation in CsCl. Lymphocytosis-promoting factor and histamine-sensitizing activity were only associated with fractions containing the fine filaments.
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