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Allometric scaling and maximum efficiency in physiological eigen time.

Bjarne Andresen1, J S Shiner, Dominik E Uehlinger

  • 1Ørsted Laboratory, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark.

Proceedings of the National Academy of Sciences of the United States of America
|April 18, 2002
PubMed
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Biological systems achieve maximum efficiency by maintaining a constant rate of entropy production on a physiological time scale, which scales with body mass. This intrinsic rate suggests all organisms are equally efficient in their own physiological time.

Area of Science:

  • Thermodynamics
  • Metabolic scaling
  • Biological physics

Background:

  • Optimization principles in physics suggest maximum process efficiency correlates with constant entropy production rate.
  • This rate is constant over an intrinsic "eigen time" scale, not ordinary clock time.
  • Biological systems exhibit a physiological time scale linked to body mass.

Purpose of the Study:

  • To investigate the relationship between biological system efficiency, entropy production, and physiological time.
  • To determine if biological organisms meet the conditions for maximum thermodynamic efficiency.
  • To explore the implications of metabolic scaling laws on intrinsic efficiency.

Main Methods:

  • Identifying biological "eigen time" with physiological time.

Related Experiment Videos

  • Analyzing the scaling relationship between physiological time and body mass (M(1/4)).
  • Comparing this to the established metabolic rate scaling with body mass (M(3/4)).

    • Main Results:

    • Physiological time scales with the 1/4 power of body mass across diverse species.
    • Metabolic rate scales with the 3/4 power of body mass.
    • Organisms exhibit a constant intrinsic rate of entropy production, fulfilling a condition for maximum efficiency.

    Conclusions:

    • Biological organisms are thermodynamically optimized for maximum efficiency.
    • Efficiency is achieved when entropy production is constant on the physiological time scale.
    • All species are equally efficient when measured in their respective physiological time.