Effects of bacterial products on a Paramecium esterase
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Cultures of Aerobacter aerogenes, Bacillus subtilis, or Escherichia coli have been shown to induce the disappearance of an esterase from Paramecium. This effect is transmitted only by live cells, and it occurs when a 0.45 μ filter separates the protozoan and the particular bacterium. There is a delay of 6 days before the effect occurs, and if the bacteria are removed the enzyme returns in the paramecia after a further delay. Characterization of the effective bacterial agent shows it to be a protein or ribonucleoprotein.
KeywordsEscherichia Coli Live Cell Bacillus Subtilis Bacterial Product Bacterial Agent
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