The sequelae of the intraspecific isolation of adult rats (right-handed, left-handed and ambidextrous animals)

We studied the influence of social isolation at the age of 2 months on zoosocial behaviour of mixed-bred male rats with different paw preference. Paw preference was determined in the test of reaching for food in the horizontal tube. The level of aggression but not sociability was found to increase significantly in dextral and ambidextrous late isolants. In sinistrals the increase of sociability but not aggression was observed. Analysis of probabilistic ethological structure of aggressive behaviour showed its validity and revealed the appearance of pathological aggression as a result of isolation in all groups of animals. Being connected with a disfunction of the regulating role of the right brain hemisphere this feature of aggressive behaviour is most pronounced in dextrals and ambidextrals.     

A method of automatic determination of "reference" spectra of CD elements of circular structure of proteins with the "aromatic contribution"

A field survey at 17 stables involving 221 horses was performed to evaluate the presence of anthelmintic resistance in the equine small strongyles (cyathostomes). The horses were allocated into treatment groups, and resistance to fenbendazole (FBZ), pyrantel pamoate (PYR) and ivermectin (IVM) was tested by the faecal egg count reduction test (FECR-test). Faecal samples were collected at the time of treatment, 14 days post treatment and 90 days post treatment. Resistance to FBZ, which was defined as a faecal egg count reduction < 95%, was found in 14 out of 17 stables. In 2 of the 14 stables the egg reductions were close to the limit of 95%, 91 and 93%, respectively. In 1 stable the egg reductions indicated resistance to PYR as well as detection of resistance to FBZ, 94% reduction for PYR and 85% for FBZ. No signs of resistance were detected to IVM. The investigation was performed in late autumn and winter, and due to the climatic conditions and cleaning procedures in the stables no reinfection took place during this period. The faecal egg count reduction from treatment till day 90 post treatment was used as an expression of the effect of PYR and IVM on the early stage (hypobiotic), late third stage and fourth stage larvae in the gut wall. This was justified because there was no reinfection and because the 14 day post treatment egg counts were zero or close to zero for the PYR and IVM treatment groups. The effects of PYR and IVM on the larval stages were compared and no statistically significant differences were found.     

The use of applied sorbents in the surgical management of wounds of the extremities]

970 laboratory experiments, 202 chronic experiments on animals and 102 clinic observations were performed to study the possibilities of sorbents to enhance the efficiency of surgical treatment in gunshot wounds of the extremities. Gravimetric, climatic, morphometrical, microbiological, spectrofluorometric, clinical and roentgenological methods of studies were used for this matter. It was ascertained that the sorbent application contributed to the optimization of the wound process. The studies have proved the advantages of composite sorbent with biologically active supplements: it has a high sorption capacity, pronounced bacteriostatic and local-anaesthetic features.     

An analysis of the epidemic cycle of meningococcal infection in Russia (1969-1993)

In this work the specific features of the epidemiological rise of morbidity in meningococcal infection in Russia for the period of 25 years are analyzed. Some factors influencing the intensity of the disease, such as etiology, specific features arising from the age of patients, social and territorial factors, are analyzed. Two waves of epidemic have been established in a single epidemic cycle. The first wave of epidemic was caused by meningococci of group A and characterized by the prevalence of city-dwellers among the patients; the second wave was caused by meningococci of groups A and B with the prevalence of the latter, especially during the period of the slump of the wave. The "Asiatic" and "European" types of morbidity were distinguished (in Moscow and St. Petersburg). The analysis of the epidemic cycle of meningococcal infection indicates the expediency of the development of new specific wide-profile preparation for prophylaxis.     

Increase in the Efficiency of a Tandem Semiconductor Laser–Optical Amplifier Based on Self-Organizing Quantum Dots

Semiconductors - Rate equations are used to analyze the characteristics of a&nbsp;tandem device consisting of a laser diode and a semiconductor optical amplifier made of a single...