Changes in plantar pressures during bipedal stance with different stance width.

We studied the influence of stance width and vision on the plantar pressures for the left and right foot during bipedal quiet standing on the pressure-sensitive insoles. The support widening shifted the left and right centers-of-foot-pressure (CFPs) laterally and forward (right foot), diminished SDs of: the left and right mean plantar pressures (MPPs), the anteroposterior and mediolateral displacements of left and right CFPs. It also decreased negative correlations between left and right MPPs and between mediolateral displacements of left and right CFP and increased positive correlation between anteroposterior displacements of left and right CFPs, more expressive with eyes-open. The later results suggested that support widening increased the weight of exploratory behaviour regarding anteroposterior equilibrium and decreased exploratory sway serving mediolateral equilibrium. Eyes' closure lead to a small left bias of the body-weight-bearing and forward shift of the left versus right CFP, thus suggesting that vision increased bilateral symmetry of stance.

Dark interaction of haematoporphyrin and proflavine with Salmonella dublin cells.

The influence of haematoporphyrin and proflavine on the virulence, survivability, respiratory activity and cell wall ultrastructure of Salmonella dublin cells was studied. There was a decrease in all biological properties investigated, especially when haematoporphyrin was used for dark incubation in comparison with proflavine. The possible clinical use of negatively charged photosensitizers is discussed.

Studies on aerosol Yersinia pseudotuberculosis infection of guinea-pigs.

Aerosol Y. pseudotuberculosis infection in guinea-pigs has been reproduced. In the course of infectious process, alveolar macrophages respiration is activated due to a rise in their cytochrome oxidase activity.

Anti-microbial susceptibility of Yersinia pseudotuberculosis and Yersinia enterocolitica under different cultural conditions.

Generally, Yersinia pseudotuberculosis and Y. enterocolitica grown at 37°C had increased susceptibility to antibiotics than when grown at 25°C. The susceptibility to kanamycin, cephalothin, tetracycline and chloramphenicol of Yersinia was also influenced by the growth medium and gas composition.

[Yersinia enterocolitica--its multiplication on nutrient media containing rhamnose, raffinose and sodium succinate]. / Yersinia enterocolitica--razmnozhavane v khranitelni sredi, sudurzhashti ramnoza, rafinoza i natriev suktsinat.

The kinetics of growth in vitro of strains Yersinia enterocolitica, serovars 0:3, 0:5, 0:8 and 0:9, on culture media containing rhamnose, raffinose and sodium succinate and at different temperatures of cultivation (4 degrees, 25 degrees and 37 degrees C) was characterized. It was established, that all the Yersinia enterocolitica serovars tested, cultivated at 25 degrees C, had the highest growth rate. A significant activation of growth at this temperature was observed when L-rhamnose and especially sodium succinate were used as substrates. The cultivation at 37 degrees C caused a sharp increase in the growth rate which, however, decreased at the end of the experiment (96th hour of cultivation), and certain stimulation of growth was observed on D-raffinose-containing medium. The growth of cells cultivated at 4 degrees C using L-rhamnose as substrate started after a lag-phase of 24 hours, which was better expressed for serovars 0:8 and 0:9. The results reported could be applied to experiments, using methods of isolation of Yersinia enterocolitica from different sources after cultivation at 4 degrees C on L-rhamnose-containing media.

[The in vitro multiplication kinetics of Yersinia pseudotuberculosis--the effect of rhamnose, raffinose and sodium succinate]. / Kinetika na razmnozhavaneto in vitro na Yersinia pseudotuberculosis--efekt na ramnoza, rafinoza i natriev suktsinat.

The reproductive potentials of strains Yersinia pseudotuberculosis serovars I, II, III, IV and V cultivated at different temperatures on media containing rhamnose, raffinose and sodium succinate were examined comparatively. It was established that the growth of serovars I, II and III was activated by sodium succinate at temperatures 4 degrees and 25 degrees C, while serovars IV and V showed lower growth rate regardless of the substrate used. At 37 degrees C D-raffinose activated the growth of the cells of serovars IV and V. The studies on the effect of different substrates on the growth of Yersinia pseudotuberculosis in a wide temperature range acquire great importance for the investigating of the process of infection, revealing some aspects of the microorganism-macroorganism relationship.