S. O. Mast, The Value of the Ciliate, Didinium, in the Study of Biology, Science, New Series, Vol. 36, No. 938 (Dec. 20, 1912), pp. 871-873 ...
In a race of didinia originating from a single individual there suddenly appeared a heritable variation in the rate of fission. This variation occurred 721 generations after conjugation and 197 ...
How a smaller microbe, Didinium, can take down a Paramecium.