Calorimetry and thermodynamic aspects of heterotrophic, mixotrophic, and phototrophic growth

Abstract

A simple stoichiometric model is proposed linking the biomass yield to the enthalpy and Gibbs energy changes in chemo-heterotrophic, mixotrophic, and photo-autotrophic microbial growth. A comparison with calorimetric experiments on the algae Chlorella vulgaris and Chlorella sorokiniana confirmed the trends but revealed large calorimetric measurement inaccuracies. The calorimetric data on purely photo-autotrophic growth was, however, in fair agreement with calculations. The thermodynamic characteristics of photosynthetic growth, including an estimation of the Gibbs energy dissipation, are compared with similar data for chemotrophic microbes.

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Acknowledgements

The authors gratefully acknowledge important funding for this work by the Swiss National Science Foundation (SNF).

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Correspondence to Urs von Stockar.

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von Stockar, U., Marison, I., Janssen, M. et al. Calorimetry and thermodynamic aspects of heterotrophic, mixotrophic, and phototrophic growth. J Therm Anal Calorim 104, 45–52 (2011). https://doi.org/10.1007/s10973-010-1278-7

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Keywords

  • Bio-photo calorimetry
  • Reaction calorimetry
  • Photosynthetic growth
  • Mixotrophic growth
  • Clorella vulgaris
  • Biological dissipation of Gibbs energy