对酵母菌增殖所必需的微量物质类所赋予的名称，统称为生物活素。 在不含有这种微量物质的合成培养基中，酵母不能增殖。其有效成分，已确定的有肌醇（生物活素Ⅰ）、β-丙氨酸、泛酸（生物活素Ⅱa）及由F.Kgl分离的生物活素（生物活素Ⅱb，维生素H，辅酶R）等。
讨论了水分活度对微生物生长、食品中油脂的氧化、酶活力、食品的质构、食品中蛋白质和维生素的影响。
The effect of water activity on growth of microorganisms, lipid oxidation, enzyme activity, food texture as well as protein and vitamins were also discussed.
考虑到现有漂白处理工艺的高温高碱条件，耐热、耐碱和低纤维素酶活的木聚糖酶成为生物漂白用木聚糖酶的首选。
As high temperature and high alkaline bleaching process, heat, alkali and low cellulase activity of xylanase is the first choice of xylanases for biobleaching .
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