Optimierung von mikrobiologischen Stoffwandlungen. Zusammenhang zwischen der Geschwindigkeit der Zellreproduktion und dem thermodynamischen Wirkungsgrad mit dem Ziel der Optimierung von mikrobiologischen Stoffwandlungen

Baumann, F.; Heinritz, B.; Ringpfeil, M.

doi:10.1002/andp.19874990408

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…This can be explained by the relation between the thermodynamic efficiency and the rate of biomass production. 16 The optimum range of thermodynamic efficiency which is closely connected to the biomass yield coefficient was calculated as between 50% and 90% of the maximum rate, assuming coupling degrees of anabolism and catabolism of -0.8 to -0.5. l 7…”

Section: Methodsmentioning

confidence: 99%

Biomass production by thermophilic microorganisms simultaneously using reaction heat

Heinritz

Gehrhardt

Baumann

et al. 1990

J of Chemical Tech & Biotech

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An energy‐economic use of reaction heat is possible only if thermophilic microorganisms convert carbon substrates into biomass at temperatures above 65°C. The thermophilic bacterium Bacillus stearothermophilus TP5 was isolated from a man‐made hot water reservoir. The highest specific growth rate of 1.6 h−1 was obtained in continuous cultivation (chemostat) on a glucose‐containing nutrient medium at 68°C, pH 6.8 and normal pressure. The highest values for the biomass production rate (3.2 g dm−3 h−1) and the biomass yield coefficient (0.39 gg−1) were obtained at a dilution rate of 1.3 h−1 (about 80% of the highest specific growth rate) under the above‐mentioned conditions. The biomass production rate of the thermophilic bacterium was higher in the chemostat than in the semicontinuous process at normal pressure. The biomass produced in the chemostat at a dilution rate of 0.4 h−1 contained 71% of protein and 8% of RNA and had an ash content of 6%. The optimum and maximum temperatures of growth were changed by raising the pressure inside the reactor. As a prerequisite for the energy‐economic use of the reaction heat, the specific heat production was determined by using a special calorimeter. The ratio of heat production to oxygen consumption (oxy‐caloric coefficient) was found to be 13.6 kJ g−1, which is close to the theoretical value deduced from mass‐ and energy‐balance theory.

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Section: Methodsmentioning

confidence: 99%

Biomass production by thermophilic microorganisms simultaneously using reaction heat

Heinritz

Gehrhardt

Baumann

et al. 1990

J of Chemical Tech & Biotech

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The application of linear irreversible thermodynamics to biological growth

Baumann

1991

Acta Biotechnologica

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Institute of Clinical Physiology Hiirtelstr. 16-18,O-7010 Leipzig SummaryWe measured the rate of cell biomass growth, the consumption of organic substrate, and the heat developed during growth. The relationship between thermodynamic efficiency and the rate of microbial growth was considered.Products are, e.g., low molecular organic acids, formaldehyde and alcohols. We obtained additional catabolic reactions : P i are the concentrations of the products. If these reactions are exergonic the energy can also be used for the anabolic reaction. I n [2] the thermodynamic efficiency was determined with output power J AG,) J , and J, are the flows of anabolic and catabolic reactions. We need the concept of KEDEM and CAPLAN [2] if only one product was produced. I n this paper the experimental values were compared with the theoretical tendency of thermodynamic efficiency. The dilution rate was varied by chemostat. [3] 1* 4 Acte Biotechnol. 11 (1991) 1 blateriale and bfethodsThe strain of Bacillus steardlremwplrilus ZZMET 11262 was cultivated in chemostat with different dilution rates. The temperature was 68OC and the pH-value 6.8. This is the optimal range of growth. The medium contains (per 1): 10 g glucose 3 g (NH,),SO, 1 g yeast extract 6 ml salts concentrate 0.6 ml trace-salts concentrate 1 ml of salts concentrate contains: 90 mg N as (NH,),SO, 20 mg K as KH,PO, 18 mg P as H,P04

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Bench‐scale calorimetry – application in biotechnology

Zentgraf¹

1992

Acta Biotechnologica

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Two calorimetric techniques are described allowing us to monitor and control microbial processes at relatively high cell densities: dynamic and continuous calorimetry. These techniques have been applied to study microbial systems, e.g. the dependence of thermodynamic efficiency and heat yield on specific growth rate, the heat yield of mesophilic and thermophilic microorganisms, the oxy-calonc coefficient during aerobic microbial growth, as well as the energetics of the yeast-cell cycle. Such studies are of importance for optimizing biotechnical processes.

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Optimierung von mikrobiologischen Stoffwandlungen. Zusammenhang zwischen der Geschwindigkeit der Zellreproduktion und dem thermodynamischen Wirkungsgrad mit dem Ziel der Optimierung von mikrobiologischen Stoffwandlungen

Cited by 4 publications

References 3 publications

Biomass production by thermophilic microorganisms simultaneously using reaction heat

Biomass production by thermophilic microorganisms simultaneously using reaction heat

The application of linear irreversible thermodynamics to biological growth

Bench‐scale calorimetry – application in biotechnology

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