RESUMEN
Of the osmotolerant yeasts Saccharomyces rouxii and Debaryomyces hansenii together with baker's yeast Saccharomyces cerevisiae were grown aerobically and anaerobically on media, their water activity was regulated either by glycerol or sodium chloride. Levels of the total carbohydrates and proteins for cells grown on these media were determined. It was found that, in most of the cases, when S. cerevisiae was grown either aerobically or anaerobically in the presence of either glycerol or sodium chloride, levels of both total carbohydrates and proteins decreased with the reduction of the water activity of the growth media. However, levels of total carbohydrates and proteins in both S. rouxii and D. hansenii showed a reciprocal relation when they were grown either aerobically or anaerobically and in the presence of either glycerol or sodium chloride