Rezumat
The authors are the first to show the increase of the auxotrophic mutants yield following a single low dose -irradiation exposure in the 14th-15th generations of Escherichia coli and different Staphylococcus, Streptococcus, Salmonella and Corynebacterium strains. The combined effect of low -irradiation dose and electromagnetic field increases additionally the mutant yield in the same bacterial generations. In the case of electromagnetic effect having been not accompanied by irradiation there is no significant mutant level in- crease in the offspring of treated bacteria.