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
Great Divide Brewing Company expand. In September 2008, Great Divide opened a new brewery that tripled its production. At the same time, they changed the art on all of their labels. The brewery's current branding is marked by sensationalized silhouette depictions of the region from which a particular beer originated (for instance, the sexualized female farmhand featured on the farmhouse ale Colette's label) and irreverent humor, as marked by the Imperial Stout Yeti's, "I believe." campaign. Great Divide Brewing Company was founded with the notion of brewing strong beers, which are defined as having an alcohol content greater than 7%. Six of the thirteen