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
Flint Brewing Company Building a group of Methodists purchased the building and turned it into the Lakeside Methodist Episcopal Church, as a way of demonstrating religion's victory over alcohol. Within a few years the church moved out, and a trucking firm began using the building as warehouse space. By the mid-1920s, the Acetylene Welding Company and the Boyd Sign Factory were also using the building, and in 1928 the Flint Casket and Woodwork Company moved in. In the early 1930s, Genesee County repealed its prohibition ordinance, and in 1933 the Flint Hill Brewing Company purchased the building and refitted it to restart brewing beer.