الفهرس 
ItroductionOnly 14 pages are availabe for public view
 |  | from | 152 |  |  |
| | | from | 152 | | |
Abstract
Yeasts are without doubt both quantitatively and
economically the most important group of microorganisms
commercially exploited by man. As for example in USA,
the total amount of yeast produced annually, including
that formed during brewing and in distilling practices,
is of the order of a million ton, and ethanol made for
all purposes by fermentation process involving yeast
totals over 2 million tons. The benefit to national
exchequers is counted in thousands of millions of dollars
(Stewart, 1981).
Currently, the use of yeast in the production of
ethanol for fuel energy is a very vogue topic in the
United states, Brazil, and a number of other countries.
However, the concept is not new, fuel ethanol has been
produced in Brazil Since 1933 and both Germany and Japan’
used it as a fuel source during the 1939-1945 world war.
Of Cource,
that has
it is the escalation in world crude oil prices
been brought about a renewed interest in the
gasohol cocept ( Kosaric et al., 1980) • Within the past
few years, the price of gasoline at the pump has tripled
and coal costs have increased over 50%.