الفهرس 
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Abstract
The main aim of this study is to enhance bioethanol production by using modern technologies. The production of bio-ethanol was carried out using six yeast strains and one bacterial strain. Out of the 7 tested strains, only 5 strains were able to produce bio-ethanol efficiently during the fermentation of sugarcane molasses.
It is worthily to mention that the highest bio-ethanol producers from sugarcane and sugar beet molasses were observed with Saccharomyces cerevisiae F15 followed by Candida kefyr EMCC77. Therefore, they were selected for further experiments that were studying the effect of environmental factors on bioethanol yield. Data revealed that the optimum pH values for bioethanol yield were 4.5 and 5 for S. cerevisiae and C. kefyr EMCC77, respectively. Whereas the optimum incubation temperature for bioethanol production for both S. cerevisiae F15 and C. kefyr EMCC77 was 32oC. Maximum production of bio-ethanol by S. cerevisiae F1