Distribution of the putative virulence factor encoding gene sheta in Staphylococcus hyicus strains of various origins.

In the present study, Staphylococcus (S.) hyicus strains isolated in Russia (n = 23) and Germany (n = 17) were investigated for the prevalence of the previously described genes sheta and shetb. Sheta was detected in 16 S.

Comparison of sample preparation and signal evaluation methods for EPR analysis of tooth enamel.

In dose reconstruction by EPR dosimetry with teeth various methods are applied to prepare tooth enamel samples and to evaluate the dosimetric signal. A comparison of seven frequently used methods in EPR dosimetry with tooth enamel was performed. The participating Institutes have applied their own procedure to prepare tooth enamel samples and to evaluate the dosimetric signal.

The oxygen effect in E. coli WP2: the role of the photoreactivatable component in modification of the oxygen effect in E. coli WP2 uvrA6.

The role of photo-products induced by secondary U.V. which accompanies high-energy gamma-radiations has been studied in bacteria in the presence and absence of oxygen.

Combined action of ultrasound and ionizing radiation on yeast cells.

This communication reports the observation of synergistic relationships between ultrasound and gamma-irradiation of stationary phase cultures of Saccharomyces cerevisiae of different strains. The gamma-ray dose was applied before or after the sound. The extent of synergism depended upon the sequence of application; it was smaller for (US + gamma-ray)-exposure in comparison with gamma-ray +US)-treatment.

Conformational transitions of antibodies induced by hapten binding.

The conformational changes of antibody structure induced by hapten molecule binding were investigated by means of thermal perturbation difference spectroscopy. The studies of the free rabit anti-dinitrophenyl antibodies show the conformational transition at temperatures between 25 and 35 degrees C. The changes occurring at the higher temperature are accompanied by the screening of the significant part of exposed tyrosine residues.