International Science and Technology Journal

Yeasts are microscopic plant biopsies, does not contain chlorophyll, it is a fungus, bread is yeast. A fungus is classified into chromases, it has the ability to resist chemical decomposition and the rapid spreal of water and stay for a reasonable period without damage in normal conditions, especially when it is dry, they form the dough and multiply in a split manner. The idea of producing bread yeast depends on providing the best conditions to allow the yeast to reproduce and by giving the basic nutrients and provides the heat and acidity and ventilation necessary to feed the yeast and its reproduces Our measurements and results show that the production of baker yeast in air left bioreactor more than in stirred tank reactor as shown in table 1 and 2