In ancient practices, the natural
presence of these microorganisms, especially Saccharomyces cer-
evisiae, spontaneously started fermentation of sugars to produce
ethanol and CO2. At the end of the 19th century, the use of exoge-
nous yeast to produce beer and bread became a usual practice,
which thus increased the demand of yeast biomass. Finally win-
eries, which were more reluctant to change traditional practices,
started to use exogenous yeast biomass in the 1950s
In ancient practices, the naturalpresence of these microorganisms, especially Saccharomyces cer-evisiae, spontaneously started fermentation of sugars to produceethanol and CO2. At the end of the 19th century, the use of exoge-nous yeast to produce beer and bread became a usual practice,which thus increased the demand of yeast biomass. Finally win-eries, which were more reluctant to change traditional practices,started to use exogenous yeast biomass in the 1950s
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