Brewing much studied, the preservative nature of the soft resins is not yet fully understood, though it has been observed that unless stored at a cool temperature, the preservative nature will decrease. Brewing is the sole major commercial use of hops. Yeast is the microorganism that is responsible for fermentation in beer. Yeast metabolises the sugars extracted from grains, which produces alcohol and carbon dioxide, and thereby turns wort into beer. In addition to fermenting the beer, yeast influences the character and flavour. The dominant types of yeast used to make beer are "Saccharomyces cerevisiae", known as ale yeast, and "Saccharomyces
Pabst Brewing Company out to the Stroh Brewery Company, which utilized excess capacity at the former flagship brewery of the G. Heileman Brewing Company of La Crosse, Wisconsin it had absorbed earlier that year. In turn, the historic Pabst brewery in Milwaukee was closed, ending a 152-year association with the city and turning that company into a virtual brewer. In 1999, Pabst purchased the Stroh label, and the brewery in La Crosse was sold to City Brewing Company. In 2001, production was contracted to Miller Brewing Company, and by then what remained of the Pabst company operated out of San Antonio. S&P was