Abstract
The new model proposed to account for the energy requirement for growth includes both a constant maintenance energy term (m) independent of the specific growth rate and a term (m′) which decreases linearly with increase in specific growth rate and becomes zero at the maximum specific growth rate. The available data for testing the model do not deviate significantly from the relations predicted. Consistent values of the maximum growth yield (Y G) can be derived, irrespective of whether the cultures are energy limited or energy sufficient. Attention is drawn to the possibility that the constant maintenance energy term may be estimated from the maximum specific growth rate.
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Abbreviations
- a :
-
specific maintenance rate
- h-1 :
-
m, overall maintenance energy coefficient
- m 1 :
-
constant maintenance energy coefficient
- m′:
-
growth-rate dependent maintenance energy coefficient when μ=0, that is, (m-m1); mmol substrate (g dry wt)-1 h-1
- q :
-
specific rate of substrate utilization; subscript denotes the substrate
- q m :
-
the maximum value; mmol (g dry wt)-1 h-1
- Y :
-
growth yield
- Y G :
-
maximum value (when m=0); mg dry wt (mmol substrate)-1
- μ:
-
specific growth rate; μm, the maximum value (when m=0)
- μm :
-
observed maximum value; h-1
References
Dawes EA, Senior PJ (1973) The role and regulation of energy reserve polymers. Adv Microbial Physiol 10:135–266
Hempfling WP, Mainzer SE (1975) Effects of varying the carbon source limiting growth on yield and maintenance characteristics of Escherichia coli in continuous culture. J Bacteriol 123:1076–1087
Neijssel OM (1977) The effect of 2,4-dinitrophenol on the growth of Klebsiella aerogenes NCTC 418 in aerobic cultures. FEMS Microbiol Lett 1:47–50
Neijssel OM, Tempest DW (1976) Bioenergetic aspects of aerobic growth of Klebsiella aerogenes NCTC 418 in carbon-limited and carbonsufficient chemostat culture. Arch Microbiol 107:215–221
Pirt SJ (1965) The maintenance energy of bacteria in growing cultures. Proc Roy Soc B 163:224–231
Pirt SJ (1975) Principles of microbe and cell cultivation. Blackwell Scientific Publications, Oxford
Stouthamer AH (1977) Energetic aspects of the growth of microorganisms. In: Haddock BA, Hamilton WA (eds) Microbial energetics, 27th Symposium of the Soc gen Microbiol. Cambridge University Press, London, pp 283–315
Tempest DW (1978) The biochemical significance of microbial growth yields: a reassessment. Trends Biochem Sci August 180-184
Watts Pirt M, Pirt SJ (1977) Photosynthetic production of biomass and starch by Chlorella in chemostat culture. J appl Chem Biotechnol 27:643–650
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Pirt, S.J. Maintenance energy: a general model for energy-limited and energy-sufficient growth. Arch. Microbiol. 133, 300–302 (1982). https://doi.org/10.1007/BF00521294
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DOI: https://doi.org/10.1007/BF00521294