Changes

Yeast flocculation typically refers to the clumping together of brewing yeast once the sugar in a beer brew has been converted into alcohol. In the case of ale yeast [[Saccharomyces cerevisiae]] the yeast floats to the top of an open tank, whereas with lager yeast [[Saccharomyces pastorianus]] the yeast will sink to the bottom of the tank.

'''Yeast flocculation''' typically refers to the clumping together of brewing [[yeast]] once the [[sugar]] in a beer brew has been converted into [[alcohol]]. In the case of ale yeast [[Saccharomyces cerevisiae]] the yeast floats to the top of an open tank, whereas with lager yeast [[Saccharomyces pastorianus]] the yeast will sink to the bottom of the tank.

Cell aggregation occurs throughout microbiology, in [[bacteria]], [[filamentous algae]], [[fungi]] and [[yeast]] (Lewin, 1984; Stratford, 1992). Yeast are capable of forming three aggregates; mating aggregates, for DNA exchange; chain formation, for development and differentiation; and flocs as a survival strategy in adverse conditions (Calleja, 1987). Brewing strains are [[polyploid]] so mating aggregates do not occur. Therefore only chain formation and flocculation are of relevance to the brewing industry.

Cell aggregation occurs throughout microbiology, in [[bacteria]], [[filamentous algae]], [[fungi]] and [[yeast]] (Lewin, 1984; Stratford, 1992). Yeast are capable of forming three aggregates; mating aggregates, for DNA exchange; chain formation, for development and differentiation; and flocs as a survival strategy in adverse conditions (Calleja, 1987). Brewing strains are [[polyploid]] so mating aggregates do not occur. Therefore only chain formation and flocculation are of relevance to the brewing industry.