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  • Growth characteristics of Rhizopus nigricans in pelleted morphological form
    Pavko, Aleksander ; Kuštrin, Alenka
    Rhizopus species are industrially important microorganisms. They produce enzymes, organic acids and steroids by submerged fermentation and biotransformation. Most of the research work with these ... fungi, however, has been done with the filamentous growth form. The growth kinetics of Rhizopus nigricans in pelleted morphological form has been studied in this work. It is shown that the growth follows the "cube root" model for the pellets up to 6 mm in diameter. The estimation of mass transfer resistance shows that the intraparticle diffusion of oxygen is the rate determining step. On the other hand, pellets of 70 mm diameter with lysed centre and a 20 mm thick wall were obtained. This indicates the synergistic effect of microbial age, physiological state and adaptive control of metabolism during starvation. Improved effective diffusion of nutrients through the texture of mycelium and probably also inside the unsepted hyphae during the growth of R. nigricans pellets is also possible.
    Vir: Chemical and biochemical engineering quarterly. - ISSN 0352-9568 (Vol. 11, no. 3, 1997, str. 127-131)
    Vrsta gradiva - članek, sestavni del
    Leto - 1997
    Jezik - angleški
    COBISS.SI-ID - 18520069

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