Abstract
In chemostat cultures of Klebsiella pneumoniae (K. aerogenes) NCTC 418 we measured the concentrations of glucose and ammonium and we varied the ratio of the (limiting) concentrations of glucose and ammonium in the feed medium. By doing this at different dilution rates we found a range where growth rate varies with either concentration in the culture when the other concentration in the culture is held constant. This proves that within this range, dual-substrate controlled growth occurs. Dual substrate-controlled growth was accompanied by yield coefficients for glucose and for ammonium that were intermediate between the yield coefficients obtained for single glucose or single ammonium limitation. We quantified the control by either substrate in terms of the flux control coefficient with respect to that substrate, where flux refers to growth rate. Dualsubstrate controlled growth is reflected by the finding that both flux control coefficients exceed zero, simultaneously. In the transition of glucose to ammonium limitation, the control gradually shifts from glucose to ammonium.
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Abbreviations
- s:
-
Steady-state concentration of substrate in the culture
- Sr M:
-
Concentration of substrate in reservoir medium
- Y gδDWδmol-1 :
-
Yield
- D h-1 :
-
Dilution rate
- μ h−1 :
-
Specific growth rate
- μmax h−1 :
-
Maximal growth rate
- C μ2 :
-
Control coefficient, of s on μ
- J h-1 :
-
Rate or flux
- JATP mmolδgδDW-1δh-1 :
-
ATP synthesis rate
- a:
-
Anabolism
- c:
-
Catabolism
- l:
-
Leak
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Rutgers, M., Balk, P.A. & van Dam, K. Quantification of multiple-substrate controlled growth-simultaneous ammonium and glucose limitation in chemostat cultures of Klebsiella pneumoniae . Arch. Microbiol. 153, 478–484 (1990). https://doi.org/10.1007/BF00248430
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DOI: https://doi.org/10.1007/BF00248430