[The age-dependent effect of copper ions on different strains of the wine yeast (Saccharomyces [corrected] cerevisiae var vini)].

The chronological ageing of wine yeast strains isolated from natural populations and the resistance of cells of different age to copper ions have been studied. In total, 25 wine yeast strains derived from the "Tsolikauri" population of Sviri village (Imereti, West Georgia) were tested. The strains were transferred to the standard (control samples) and the copper sulphate-containing complete media and stored at 2 degrees C temperature.

Genetic changes induced by the pesticide Ridomol in the soybeans sprouted from the seeds of different ages.

An objective of presented study was to investigate the effect of the genetically active xenobiotics Ridomili on the genetic apparatus of the plants sprouted from the soybean seeds of different ages. The experiments were conducted on the soybean (Glycine max) genetic line L65-1237. The studies were performed on the 1-, 2- or 3- year old seeds of the heterozygous Y(11)y(11) plants.

[Effect of the light regime and electromagnetic fields on mammary carcinogenesis in female rats].

Outbred female rats from the age of 1 month were kept at rooms with 12 h light: 12 h dark (LD), 24 h light (LL) and 24 h dark (DD) regimens and 2 weeks later were exposed to 3 weekly i.v. injections of NMU at the dose of 50 mg/kg and starting in 2 days after first NMU administration-to variable or static magnetic fields (VMF and SMF).

[Modifying effect of light and electromagnetic field on development of mammary tumors induced by N-nitrosomethyl urea in female rats].

Female rats aged I month and older were kept indoors in darkness, under lighting for 24 hours or exposed to ordinary lighting (light--12 hrs; darkness--12 hrs). Three weeks after the beginning of the experiment, they received N-nitrosomethyl urea (NMU) treatment in the dose of 50 mg/kg, intravenously, at weekly intervals, and were exposed to alternating 50 Hz (AMF) or static 0.2 oersted, (DMF) electromagnetic field radiation for 3 hrs, daily.

Low-frequency electromagnetic radiation enhances the induction of rat mammary tumors by nitrosomethyl urea.

Low-frequency electromagnetic fields enhance the induction of mammary gland tumors in rats using nitrosomethyl urea. The incidence of tumors depended on the duration of exposure to static (dc) and variable (ac) magnetic fields. Variable magnetic fields induced mammary gland cancer much more frequently than static ones.

[The effect of low-frequency electromagnetic fields on the development of experimental mammary tumors].

The paper discusses the effect of low-frequency electromagnetic fields on the development of nitrosomethylurea-induced breast cancer in rats. The occurrence, mean latency period and morphological pattern of breast malignancy was shown to depend upon duration of exposure to variable and static magnetic fields.