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A new apparatus for controlling dissolved oxygen concentration in the culture media was tested. Using the apparatus, the automatic dosing of hydrogen peroxide (decomposed by catalase to oxygen and water) was possible, and a significant increase of dissolved oxygen, gluconic acid (3-fold) and over 5-fold intracellular catalase activity were obtained in comparison with the traditional aeration. It also minimises contamination, lowers the expenses on power consumption of aeration, reduces foaming and, consequently, high cost of antifoam emulsion and bacteriological filters.
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