сахароза

The article presents the results of a study of the effect of sucrose and maltose concentration on the reproduction process of the yeast Saccharomyces cerevisiae. The studies were performed on samples of alcohol, baking, wine and brewer’s yeast. The regularities of the influence of sucrose and maltose concentration, the final concentration of yeast of different strains and the duration of the lag phase period were studied. The specific growth rates of the studied yeast strains at different concentrations of sucrose and maltose in nutrient media were determined.

In the presented study, the significant operating variables regarding biosynthesis of citric acid process were assessed and their effects on the process yield were analysed. These variables, namely, initial sucrose concentration, methanol concentration, inoculum density, initial medium pH, spore age, stirrer speed, incubation period, fermentation temperature, particle size distribution, oxygen flow rate, and moisture content have significant influence on bioprocess of citric acid production.

The basic problems of development of restoration materials in Europe are considered. The basic ways of optimizing the binder compositions based on roman cement and hydraulic lime are presented and the technological parameters of formation of roman cement and hydraulic lime with marl and marlaceous limestone of Galicia are determined. The possibility of the use of additives- retarders of hydration of modified binders is showed and their influence on physical and mechanical properties of the studied compositions is established.