Adaptive acousto-optic technique for femtosecond laser pulse shaping.

We discuss the theoretical and experimental investigation of acousto-optic dispersive tunable filters, based on quasi-collinear geometry of light-sound interaction in a tellurium dioxide single crystal. The geometry uses the effect of strong acoustic anisotropy in the paratellurite as well as peculiarities of acoustic wave reflections at the free boundary of the crystal. A mathematical concept for determination of optical, electrical, and constructional parameters of the filters is developed.

[Genotyping Yersinia pestis strains from various natural foci].

Seven genetic variants of Yersinia pestis were detected by finger-printing of 85 strains of this bacterium from natural foci by means of a BX probe. Variants of Y. pestis strains correlate with certain species of carriers.

[An immunoenzyme test system for the identification of typical and atypical strains of the plague microbe].

The authors have developed the optimal variant of the enzyme immunoassay system that contains plague murine monoclonal and equine polyclonal immunoglobulins and identified all plague microbe strains at a high sensitivity (3.84 m.cl/ml).

[Highly repetitive elements in the genome of plague pathogen].

Y. pestis high repeated sequences DNA (HRS) used as probes in the blot hybridization procedure made it possible to reveal some tendencies of their location on the chromosome, namely, the correlation with the regions where Y. pestis strains were isolated, correlation with the stability of their properties and, perhaps, with the variation of individual strains.

[Plasmid composition of Yersinia pestis strains from different natural foci].

The study of the plasmid composition of 246 Y. pestis strains from different natural foci in the USSR and other countries revealed that 173 strains (70%) carried three known plasmids with a molecular weight of about 6, 45-50 and 60 megadaltons (MD) respectively. In 20 strains (8%) obtained from different sources additional cryptic plasmids were detected.