RELATIONSHIP BETWEEN BIOLOGICAL AND PHYSICAL PROPERTIES OF DRY YEAST CELLS

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Abstract
The resistivity to heat inactivation and cold medium treatment was studied in a series of dry yeasts with various water contents. The heat resistance of the samples showed a marked dependence upon the water content, giving activation energies of 80 kcal with relatively wet cells and 60 kcal with relatively dried cells, respectively. The lowering of the biological activity shown after the rehydration with a cold medium was prevented, at least partially, by preheating the sample at specified temperature before the rehydration procedure. This protective effect disappeared after several hours standing at room temperature, suggesting that the related physical state related with a time constant of hours in order of magnitude. A domain map is presented to show diagrammatically the relationship between biological properties of the dry yeast and its related physical states in terms of the cell temperature and the cell water content.

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