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
P. Ballantine and Sons Brewing Company brand began losing popularity. In 1965 Carl Badenhausen sold the company but remained at the helm until his retirement in 1969. In the mid-1960s the company went into decline. It was losing market share to lighter lagers with less alcohol content. In 1972, despite advertising efforts to revive the company, the owners agreed to sell the brand, the company, and all their assets to the Falstaff Brewing Corporation in 1972. The new owners closed the original brewery in Newark, started brewing elsewhere, and did not strictly adhere to Ballantine's recipes. The general consensus is that, under the stewardship of Falstaff,