الفهرس 
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Abstract
he optimization for the production of cell biomass of Saccharomyces cerevisiae was
studied. The highest growth rate was achieved at 2% glucose; 1% peptone; 1% yeast
extract, 1% malt extract with inoculum size 8% and at initial pH 5.5 after 48h at 30°C
and 200 rpm. This is conditions increased the biomass production by 1.53 fold compared
to the basal medium. The extracted oligosaccharide from the yeast cell walls have been
demonstrated to be effective as prebiotics for seven probiotics strains known as:
Archives Des Sciences Vol 66, No. 3;Mar 2013
119 ISSN 1661-464X
Bifidobacterium bifidum, Lactobacillus casei, Lactobacillus reuteri, Lactobacillus
bulgaricus, Lactobacillus helveticus,Lactobacillus rhamnosus and Lactobacillus
acidophilus. The produced oligosaccharides were failed to have antimicrobial activity
against: Escherichia coli; Staphylococcus aureus; Streptococcus pyogens; Pseudomonas
aeruginosa and Candida albicans.