[en] The average content of deuterium in Pd-electrodes has been controlled by measurements of the relative electrical resistance, being standardized with measurements at equilibrium in gaseous deuterium. At ambient inert pressure and at high pressures of gaseous deuterium up 4.5 kbar at 298 K, the cathodic uptake of deuterium was determined. Simultaneously, at high pressures of deuterium, the electrochemical oxidation of deuterium extracted from Pd-anodes was followed. The electrochemical deuterium uptake at ambient and high pressures corresponds to excess deuterium pressures of about 80-150 bars. These results devaluate uniquely at high estimate of deuterium activity by Fleischmann's and Pons' paper. The probable reason of this limited activity of cathodic deuterium seems to be formation of bubbles at this electrode. (author). 16 refs, 9 figs