| environ. |
yeast Many species of unicellular fungi, most of which belong to the Ascomycetes and reproduce by budding. The genus Saccharomyces is used in brewing and winemaking because in low oxygen concentration it produces zymase, an enzyme system that breaks down sugars to alcohol and carbon dioxide. Saccharomyces is also used in bread-making. Some yeasts are used as a source of protein and of vitamins of the B group (众多单细胞真菌物种，其中大部分属于子囊菌并通过萌芽来繁殖。酵母用于发酵酿酒，因为它在低浓度氧时产生酿酶，酶系统能够将糖分解成酒精和二氧化碳。酵母还可用于面包制作。有些酵母菌被用来作为蛋白和B类维生素的来源。) |
