[Fluctuations in the numbers of Bdellovibrio bacteriovorus and host bacteria in a 2-component system].

The number of interacting organisms in a two-membered bacterial "Bdellovibrio bacteriovorus--bacterium-host" system varied within a long period of time. The variations occurred in the counterphase and had a complicated irregular character with an altering period. The Volterra principle of collisions can be applied to this type of interaction between microorganisms.