ArticleSour Sans Bacteria – Brewing with lactic acid-producing yeast New strains of yeast are being released in dizzying array thanks to yeast wranglers. Discover some of the benefits and pitfalls of these new strains being offered.Already a member? Log InWritten by Michael TonsmeireYou'll Also Like Article MEMBERS ONLY The Role of pH in Brewing pH plays a role in every step of the brewing process — from the time you mash in, all the way through to the final beer that fills the glass. Take a closer look at pH throughout the brewing process. Article MEMBERS ONLY IBUs: Modern Beers with Old Formulas – Advanced Brewing While these approximations are reliable enough for classic hopping techniques and amounts, hopping has evolved to be more varied and aggressive.