[Relationship between the UV-induction of exact exclusion of transposons and the function of umuDC, lexA, recA genes and plasmid pkM101].

A pair of isogenic strains-E. coli K-12 and E. coli B/r differing by the status of umuDC genes and presence of pKM101 plasmid-were constructed and the relationship between UV induction of transposons Tn5 and Tn 10 and the gene umuDC function shown.

[Effects of interferon inducers on chemically-induced mutagenesis and carcinogenesis].

The murine bone marrow cellular chromosomal aberration technique was used to reveal anticlastogenic effects of the natural interferon inductors ridostin and larifan, as well as the synthetic ones polyguacil and amyxin. The action of the interferon inductors was timed to the maximum production of interferon in the body. Anticarcinogenic, antitumor, and antimetastatic properties of the above interferon inductors were found by using classical experimental models of carcinogenesis.

[A comparative analysis of UMUDC-dependent induction of tandem duplications, point and insertional reversions in Salmonella].

Comparative analysis of UV induction of tandem chromosome (Mtc+) duplications and reversions of point mutations (base pair substitutions) and of insertion mutations (precise excision of Tn10) was carried out. Salmonella (umuST) genes deficiency preventing dose-dependent UV induction of point mutation reversion were shown to have a less pronounced effect on the induction of tandem chromosome duplications. UV induction of tandem chromosome duplications is similar to UV induction of insertion mutation reversion: dose-dependent UV induction of both occurs in umuST Salmonella strains.

[Changes in the mutagenic effect of a medium containing aflatoxin B1 as a result of the yeast activity].

Changes in the mutagenic activity of the nutrient medium containing aflatoxin Br as a result of living activity of the yeast Rhodotorula mucilaginosa I B has been studied. Reduction of mutagenic activity of the medium when tested on the strains Salmonella typhimurium TA98 (6.3 times fold), TA100 (2.