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ABSTRACT
The aim of this publication is to investigate the reactions and character of interaction of mono- and mixed yeast and actinomycetes populations, cultivated in a hemostat with and without the insecticide l-cyhalothrin. The quantities of biomass, the residual starch-like carbon substrate, the formatted and utilized glucose and the amylolotyc enzyme complex have been analyzed, in depending on dilution rate (D) for concentration of 12.5 mg.dm−3 l-cyhalothrin. The dynamics of different kinds of microorganisms in mixed cultivation has also been established. It has been found that the inhibition effect of the insecticide is not connected with the process at hydrolysis of starch, but with the metabolism of glucose. The yeast population is more stable at low dilution rate and it displaces the actinomycetes. Natural selection has an opposite effect at high D, which is due to competition for the substrate.