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Applied Biochemistry and Biotechnology

, Volume 84, Issue 1–9, pp 391–399 | Cite as

Effect of temperature on growth of psychrophilic and psychrotrophic members of Rhodotorula aurantiaca

  • A. Sabri
  • P. Jacques
  • F. Weekers
  • G. Baré
  • S. Hiligsmann
  • M. Moussaïf
  • P. Thonart
Article

Abstract

The thermodependence of growth kinetic parameters was investigated for the Antarctic psychrophilic strain Rhodotorula aurantiaca and a psychrotrophic strain of the same species isolated in Belgium (Ardennes area). Cell production, maximum growth rate (μmax), and half-saturation constant for glucose uptake (Ks) of both yeasts were temperature dependent. For the two yeasts, a maximum cell production was observed at about 0°C, and cell production decreased when temperature increased. The μmax values for both strains increased with temperature up to a maximum of 10°C for the psychrophilic strain and 17°C for the psychrotrophic strain. For both yeasts, Ks for glucose was relatively constant at low temperatures. It increased at temperatures above 10°C for the psychrophilic strain and 17°C for the psychrotrophic strain. Although its glucose affinity was lower, the psychrotrophic strain grew more rapidly than the psychrophilicone. The difference in growth rate and substrate affinity was related to the origin of the strain and the adaptation strategy of R. aurantiaca to environmental conditions.

Index Entries

Rhodotorula aurantiaca growth kinetics psychrophilic psychrotrophic cold adaptation 

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Copyright information

© Humana Press Inc 2000

Authors and Affiliations

  • A. Sabri
    • 1
  • P. Jacques
    • 1
  • F. Weekers
    • 1
  • G. Baré
    • 1
  • S. Hiligsmann
    • 1
  • M. Moussaïf
    • 1
  • P. Thonart
    • 1
  1. 1.Centre Wallon de Biologie IndustrielleUniversity of LiegeLiegeBelgium

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