Temperate Legionella bacteriophage: discovery and characteristics

For the first time, temperate Legionella bacteriophage was isolated from organs of guinea pig infected with Philadelphia 1 strain of Legionella pneumophila. Negative colonies of bactriophage from 1.5 to 2.5 mm in diameter were detected. Central part of them was transparent and surrounded by peripheral zone of partial lysis. Electron microscopy showed that corpuscles of the phage consist from multifaceted elongated head of stretched hexagonal form and short tail. The bacteriophage lyzed bacteria, which cause Legionnaires' disease, and also had certain lytic activity against causative agent of tularemia.     

Film recording of the kinematics of dolphin swimming

An ingenious method for recording the forward motion of dolphins and decoding the pictures was elaborated. The method makes it possible to reproduce the trajectories of body points of a swimming dolphin from their positions on pictures.     

The methodology of the theory of self-organization in the development of concepts on the physiological mechanisms of vestibular reactions

Sources of modern vestibulology's crisis status are determined. New methodological questions of object exploration of vestibular function and vestibular reactions are marked. New theoretical views are developed, some results of these theoretical views's practical realization are presented, perspective possibilities of new approach are defined.     

Connection of outer membrane protein composition in Yersinia pestis cells with intrinsic plasmids]

A set of isogenic derivatives of Yersinia pestis EV strain was obtained including the variants harbouring the different compositions of Yersinia own plasmids. The protein profiles of outer membranes of the set of strains were defined. The polyacrylamide gel electrophoresis has shown the small 6.1 Md plasmid to code an outer membrane protein with mol mass 29 kDa, different from pesticin I, while the heavy 60.0 Md plasmid encodes the 15-16 kDa polypeptide different from monomers of F1 and T-antigens of plague microbe.     

Effect of additional loading on kinematics and hydrodynamics of dolphins]

The results of comparative measurements of hydrodynamic resistance of a solid model of dolphin and of additional load imitating an autonomous apparatus placed on the dolphin body are presented. The loading included cylinders (with rounded anterior and posterior ends) and spheres. They were fixed on the dorsal fin of the dolphin model in such a way that the interrelationship between the load and the model by a water stream minimal. In several experiments, a thick ring (dr = 10 mm) was fixed in the region of the dolphin respiratory opening to reach the turbulence of the boundary layer. The dolphin model with loads was towed in a speed range between 1.0 and 4.5 m/s. It was shown that the hydrodynamic resistance of additional loads is comparable with the resistance of the solid dolphin model. For the entire spectrum of loading in the preset range of towing speeds, the coefficient of hydrodynamic resistance of loading (according to the area of the wet body surface) was from 10 to 145% of the coefficient of the dolphin model resistance. It was assumed that the results of the measurements of kinematics and hydrodynamic characteristics of a freely-swimming dolphin can substantially differ from the results obtained on a dolphin carrying devices (at restricted power of the animal). Similar problems can also arise if the animals will carry devices with a higher hydrodynamic resistance.