The influence of different modes of ventilation on standing balance of athletes.

Background: The respiratory movements are one of the factors influencing standing balance. Although well-trained athletes have better postural performance compared to untrained men, it's not quite clear, if the formers' upright posture would be more stable during different ventilation modes, maximal voluntary hyperventilation and inspiratory breath-holding. There are no studies on this subject in the available literature.

[Assessment of influence of breath holding and hyperventilation on human postural stability with spectral analysis of stabilographic signal].

The influence of breath holding and voluntary hyperventilation on the classic stabilometric parameters and the frequency characteristic of stabilographic signal were studied. We measured the stabilometric parameters on the force platform ("Ritm", Russia) on the healthy volunteers (n = 107) during quiet breath, voluntary hyperventilation (20 seconds) and maximal inspiratory breath holding (20 seconds). Respiratory frequency, respiratory amplitude and ventilation were estimated with strain gauge.

[An ultrastructural study of the apical cytoskeleton of the epithelial cells in the frog bladder with an ADH-dependent and an ADH-independent increase in osmotic permeability].

Immunocytochemical methods of electron and confocal microscopy were applied for studying the primembrane actin cytoskeleton in the frog urinary bladder granular cells, following the two actions: under the increased vasopressin-induced water permeability, and following autacoid removal by multiple changes of the Ringer solution around the serosa. In both cases similar changes have been revealed in the structure of the apical cytoskeleton and, in addition, a decrease in the density of its actin filament distribution was noticed.

[Morphologic changes in lens cells of the rabbit eye after irradiation with neodymium-YAG laser with wavelength 1.32 micrometers].

The exposure of the rabbit's lens to laser radiation (1.32 microns) induced complex damage probably due to heat-related changes in the lens fibers at the site of the beam action. Heating and coagulation of the tissues changed the position or led to the rupture of some lens fibers.

[Phagocytosis and endocytosis in the colorless flagellate Thaumatomonas lauterborni].

Phago- and endocytosis have been studied in the colourless flagellate T. lauterborni using electron microscope. The coated pits are formed on the dorsal surface of the cells and in the flagellar pocket; then they are transformed into coated vesicles and transported into the ventral part of the cell loosing their clathrin coat.