Pavel Polasek

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Transverse vaginal septum is a defect of vertical fusion during embryogenesis of the vagina. The estimated incidence is 1 per 30,000 to 84,000 women. It is infrequently associated with genitourinary tract, gastrointestinal tract, musculoskeletal, and cardiac malformations. Previous reports of transverse vaginal septum have included unilateral absence of the(More)
A new technique for achieving repeated sampling of fourth ventricular cerebrospinal fluid (CSF) from the cisterna magna of unanesthetized rats is described. The sampling cannula is positioned extracranially, in contrast to previously published techniques which require insertion through the skull. CSF samples, withdrawn from unanesthetized rats before,(More)
Rats were anesthetized with urethane and a limited occipital craniotomy was performed to expose the caudal medulla in the region of the obex. Injections were made into sites in the brainstem of spontaneously-breathing rats through glass micropipettes. Tidal volume, respiratory frequency, minute volume, blood pressure and heart rate were recorded before and(More)
Rats were anesthetized with urethane and limited occipital craniotomy was conducted to expose the caudal medulla in the region of the obex. Microinjections of adenosine were made into the nucleus tractus solitarius and heart rate and blood pressure responses recorded. Adenosine produced dose-related decreases in blood pressure and heart rate. The data(More)
Ethanol in the range of 0.76-2.40 M caused an immediate increase in the Ca permeability of the plasma membrane of resealed human red blood cell ghosts in which intracellular free Ca could be continuously monitored by means of the Ca chromophore arsenazo III. At a given concentration of ethanol, the Ca permeability increased markedly a few minutes following(More)
The sensitivity of the (Na+ + K+)-ATPase to inhibition by Ca was increased 30-fold by a partially purified extract of human red cell hemolysate. The hemolysate fraction reduced the concentration of free Ca required for 50% inhibition from 30 microM to approx. 1 microM. Ca-dependent inhibition of the (Na+ + K+)-ATPase in the presence and absence of the(More)
The efficiency of removal of cellular organic matter (COM) of cyanobacteria Microcystis aeruginosa from water with ferric sulfate is influenced primarily by coagulant dosage and reaction pH. Therefore, optimization of the reaction conditions is a prerequisite for efficient purification of surface waters. Because the isoelectric point of COM occurs at a low(More)
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