FIG. 6.

Photomicrographs of F. major cells grown in chemostats with and without predation and at different growth rates. (A through C) F. major from the predation experiment before inoculation with the flagellate (A) and 4 days (B) and 15 days (C) after inoculation with the flagellate. Before the start of predation, the bacteria were cultured at a growth rate of 0.5 day⁻¹. Three Ochromonas sp. strain DS cells are shown in panel B. (D and E) F. major from the growth rate chemostat experiment at growth rates of 0.5 day⁻¹ (D) and 2.0 day⁻¹ (E). Flagellates were not included in this experiment.