الفهرس 
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Abstract
from the previous results it appeared that the best concentration or
xylose i(>r iactic acid productton by conventional batch culture wtth pll-stat
was 50 gm/L. While in case of using electrodialysis fermentation with
microlilter method to release the end product from fermentation medium the
best concentration of xylose was 80 gm/L that gave the highest result. In case
of continuous culture, the favorable result was obtained with xylose
concentration of 20 gm/L and dilution rate of 0.22 h- 1
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llowcwr, for nisin Z biosynthesis, the optimum fermentatton
conditions f(>r production were medium consist of (gm/L): Polypeptone I 0.0
gtn, yca:;t c.xllact 10.0 gm, sodium chloride 5.0 gm, xylos~.: 20.0 gnt, tnagncsium
sulphate 5.0 gm, cystine 5.0 gm, tween 80 5.0 milL (v/v) calcium chlmide 7.5
gm and the optimum environmental conditions were incubation temperature 30
oc. pi I 5.5 agitation speed 200 rpm/min, inoculum size 10% (v/v) and preculture
time for inoculum of four hours, such fermentation conditions produced
(2599 IU/ml. medium). In addition, other important fermented by-products
(lactate and acetate) were produced like those obtained under conditions used
for lactic acid production. Thus, these products could be considered important