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Toma, M. K.; Ruklisha, M. P.; Vanags, J. J.; Zeltina, M. O.; Lelte, M. P.; Galinine, N. I.; Viesturs, U. E.; Tengerdy, R. P.

Inhibition of microbial growth and metabolism by excess turbulence

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  • Medientyp: E-Artikel
  • Titel: Inhibition of microbial growth and metabolism by excess turbulence
  • Beteiligte: Toma, M. K.; Ruklisha, M. P.; Vanags, J. J.; Zeltina, M. O.; Lelte, M. P.; Galinine, N. I.; Viesturs, U. E.; Tengerdy, R. P.
  • Erschienen: Wiley, 1991
  • Erschienen in: Biotechnology and Bioengineering, 38 (1991) 5, Seite 552-556
  • Sprache: Englisch
  • DOI: 10.1002/bit.260380514
  • ISSN: 0006-3592; 1097-0290
  • Entstehung:
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  • Beschreibung: <jats:title>Abstract</jats:title><jats:p>Excess turbulence caused by high‐intensity stirring inhibited microbial growth and metabolism. In stirred tank bioreactors, the growth rate and lysine biosynthesis decreased in <jats:italic>Brevibacterium flavum</jats:italic> beyond 900 rpm, the growth rate of <jats:italic>Trichoderma reesei</jats:italic> on wheat straw beyond 150 rpm, and the growth rate of <jats:italic>Saccharomyces cerevisae</jats:italic> beyond 800 rpm. The term <jats:italic>turbohypobiosis</jats:italic> was introduced to describe this inhibition. Turbohypobiosis was characterized by a stress factor <jats:italic>F</jats:italic><jats:sub>str</jats:sub> expressing the interaction of medium flow with microbial cells in local turbulent zones, dependent on the energy distribution of the stirring regime. Lysine synthesis was inhibited at significantly lower <jats:italic>F</jats:italic><jats:sub>str</jats:sub> values than the growth of <jats:italic>B. flavum.</jats:italic> The main reason for the inhibition was shear effects causing decreased adenosine triphosphate (ATP) generation, lower O<jats:sub>2</jats:sub> uptake, and lower specific growth rate of bacteria.</jats:p>