CONVERSION EFFICIENCIES IN HETEROTROPHIC ORGANISMS

CONVERSION EFFICIENCIES IN HETEROTROPHIC ORGANISMS Summary 1. The maximum possible efficiency at which living systems are able to convert input nutrients to their own biomass is between 70 and 80 %. 2. Conversion efficiency in bacteria, protozoa and metazoan cells in culture approximates more closely to 60%. 3. Conversion efficiency during embryonic development begins below 60% and rises above this level in the later stages. 4. Very young, post‐natal organisms have high net efficiencies; 50 to 70% in homeotherms and 50 to 80 % in poikilotherms. 5. In cellular systems, capable of proliferation, conversion efficiency is independent of food supply. This means that conversion is directly dependent on nutrient supply. 6. Control of growth at the tissue level may occur through the control of the supply of nutrients to the tissues and its entry into the cells. 7. Compensatory growth, after and during undernutrition, involves increased absorption efficiency and reduced metabolic costs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biological Reviews Wiley

CONVERSION EFFICIENCIES IN HETEROTROPHIC ORGANISMS

Biological Reviews, Volume 52 (3) – Aug 1, 1977

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Publisher
Wiley
Copyright
Copyright © 1977 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1464-7931
eISSN
1469-185X
D.O.I.
10.1111/j.1469-185X.1977.tb00840.x
Publisher site
See Article on Publisher Site

Abstract

Summary 1. The maximum possible efficiency at which living systems are able to convert input nutrients to their own biomass is between 70 and 80 %. 2. Conversion efficiency in bacteria, protozoa and metazoan cells in culture approximates more closely to 60%. 3. Conversion efficiency during embryonic development begins below 60% and rises above this level in the later stages. 4. Very young, post‐natal organisms have high net efficiencies; 50 to 70% in homeotherms and 50 to 80 % in poikilotherms. 5. In cellular systems, capable of proliferation, conversion efficiency is independent of food supply. This means that conversion is directly dependent on nutrient supply. 6. Control of growth at the tissue level may occur through the control of the supply of nutrients to the tissues and its entry into the cells. 7. Compensatory growth, after and during undernutrition, involves increased absorption efficiency and reduced metabolic costs.

Journal

Biological ReviewsWiley

Published: Aug 1, 1977

References

  • Enthalpy changes accompanying the growth of Saccharomyces cerevisiae (Hansen)
    Battley, Battley
  • Regulation of energy exchange
    Brobeck, Brobeck
  • The energy relations of mitotic activity
    Bullough, Bullough
  • Energy, total carbon and oxygen demand
    Busch, Busch
  • On the regulatory nature of individual growth: some observations from freshwater snails
    Calow, Calow
  • Locomotory strategies in freshwater triclads and their effects on the energetics of degrowth
    Calow, Calow; Woollhead, Woollhead

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