Abstract
Growth thermograms of bakery yeast grown on a liquid synthetic mediumcontaining glucose as a limiting energy source were studied at various temperatures. Kinetic analysis of the thermogramswas performed to obtain the apparent maximumgrowth rate constant and the substrate constant. By using the Arrhenius equation, the activation energy of growth was estimated to be EA=56.3±5.1 kJmol-1. From the variation of the substrate constant over the temperature range studied, the enthalpy change of glucose uptake by the yeast cells was determined to be AH=-6.2±2.5kJmol-1. The corresponding Gibbs energy and entropy changes were ΔG=-16.4±0.2kJ mol-1 and ΔS=34.2±8.4J mol-1K-1 at 25°C, respectively.
