[Improvement in the system of checking and assessing the physical fitness of military physicians].

Problematic questions of physical training and physical fitness of military physicians are described in this article. The results of studies and estimation of the existing system of physical training of military physicians are depicted. Optimal fitness norms are recommended for MOS "Military physician".

[Fusion of Erwinia chrysanthemi spheroplasts in an electric fields].

A new approach has been elaborated for electrofusion of Erwinia chrysanthemi spheroplasts. The new approach consists of superimposition of high voltage impulses on the pellet of tightly contacting cells in the course of centrifugation. The mixture of spheroplasts of two genetically marked strains was placed into the special centrifuge chambers and spinned for 15 min at 2500 g to get a compressed pellet between chamber electrodes.

[Use of mathematical recombination models for mapping Escherichia coli K-12 markers].

The possibility is discussed of mapping the E. coli K-12 markers on the basis of mathematical models of recombination previously developed by the authors. The analysis showed that it is advisable to use the symmetrical crossing-over model for mapping the genes close to the selective marker.