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[Respiratory activity of diploid Pullularia pullulans strains].

The activity of respiration was compared among three strains (one haploid strain and two diploid strains) of Pullularia pullulans, in cultures of different age. The strains hardly differed in the intensity of endogenous respiration. During respiration on glucose, the diploid strain of P. pullulans 11254(13) that synthesized pullulan at a higher rate was also characterized by lower rates of oxygen uptake and carbon dioxide evolution per unit biomass as compared to two other strains. In this case, the cells of the diploid strain of P. pullulans 11254(13) had a lower respiration quotient, i.e. they oxidized a lesser part of the substrate to carbon dioxide. As the result, the diploid strain 11254(13) can use a greater portion of the carbon source for pullulan synthesis.