Six different yeasts: Saccharomyces cerevisiae (I); S.
dastorianus NRRL Y12693; S. cerevisiae (II); S. dayanus
NRRL Y-12624; S. cerevisiae NRRL Y-12632
and S. lodgwii were cultivated in different fermentation
media. The results showed that S. cerevisiae (I) gave
the highest biomass production. Sefry Beesha dates
contained 60% total reducing sugars. When blackstrap
molasses, the carbon source of the fermentation
medium, was replaced by an equivalent amount of
Sefry Beesha date sugars, they were as suitable as the
molasses in the production of yeast. The best datesugar
concentration was 50"0 mg/mL Ammonium
sulphate was a good nitrogen source, at a concentration
of 2"0 mg/ml, for the production of yeast biomass.
Biotin, at a concentration of 50 pg/l, was a good
growth stimulator for S. cerevisiae (I). The ash of S.
cerevisiae (I) contained Na, Mg, Ca, Fe, Zn and Cu.
Cobalt and Ni were not detected. The concentrations
of these metals in the baker's yeast are non-toxic.