Pasteur Brewing Louis Pasteur – Science, Health, and Brewing It took scientists such as Louis Pasteur to take yeast from the metaphysical realm into something that we can now understand and manipulate.
There are two basic styles of brewer’s yeast: ale and lager. Ale yeast (Saccharomyces cerevisiae – “sugar fungus ale”) works at warm temperatures (15-25C) in the brewery and forms a vast blanket of froth on top of the wort.
