for many diastatic yeasts, diastastic enzymes are produced when there is an absence of simple sugars and the presence of oxygen. Open fermentation creates these conditions. Some diastatic yeasts are compulsive enzyme producers and make them as a function of fermentation, 3711 is a good example of this, it creates them regardless of fermentation conditions. Even when fermenting a glass of sugar water it creates them. 4724 is a good example of a diastatic enzyme producer only when simple sugars are absent and oxygen is present, such as during an open primary fermentation.