[Continuous cultivation of mono- and mixed cultures of yeasts growing in birch vernal sap flows].

All of the studied yeast organisms were characterized by a similar range of temperatures optimal for growth and by the ability to grow well at a relatively low content of a nitrogen source in the medium; however, their growth rates were different. The lowest growth rate was typical of the primary, further displace, yeast flora of spring sap flows. Both positive and negative types of interrelationship between yeast species were established during combined cultivation of yeasts. There is a principal correlation between the data obtained upon continuous cultivation of mixed cultures in the laboratory and the results of studies of the natural microbial cenosis; therefore, it is possible to reproduce the growth of the latter in experiments with a sufficiently high degree of approximation.