الفهرس 
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Abstract
In this study the suitability of different yeast strains of the genus kluyveromyces and of the genus saccharomyces for alcohol production from different substrates was determined .
Conditions for the optimization of the fermentation parameters were established for the selected yeasts.
Whey permeate, sugar beet molasses , and fodder beet juice were used as substrates for the fermentation of ethyl alcohol . two strains of the genue kluyveromyces and six strains of the genus saccharomyces were used.
strain of saccharomyces cerevisiae and saccharomyces diastaticus are unable to metabolize lactose for ethanol production. Kluyveromyces fragilis and kluyveromyces lactis NCYC 1368 b th fermented