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Journal of Experimental Biology 14,422-430 (1937)
Published by Company of Biologists 1937

Quantitative Studies on the Ciliate Glaucoma : I. The Regulation of the size and the Fission Rate by the Bacterial Food Supply

J. P. HARDING PH.D.¹

¹ Zoological Laboratory, Cambridge

1. Glaucoma was cultured in various concentrations of bacteria which were kept as constant as possible.

2. The rate of disappearance of the bacteria was a function of the concentration of the Glaucoma.

3. In low concentrations of bacteria the rate of feeding of the Glaucoma was a function of the concentration of bacteria.

4. In high concentrations of bacteria the Glaucoma were able to find almost as much food as they could take in; so that the rate of feeding tended to become independent of the concentration of bacteria.

5. Counts of food vacuoles showed that the rate of feeding never became quite independent of the concentration of bacteria. For every increase in the concentration, up to at least 8,000,000 bacteria per cu. mm., there was an increase in the rate of formation of food vacuoles.