Nitrogen source Nitrogen source provide the microorganism with the element of nitrogen for its living and reproduction The spectrum of nitrogen source is also quite wide and have two types: organic nitrogen and inorganic nitrogen In the culture medium the commonly used organic nitrogen are beef extract, yeast extract and peptone(牛肉膏,酵母膏和蛋 白胨)Nitrogen source provide the microorganism with the element of nitrogen for its living and reproduction. The spectrum of nitrogen source is also quite wide and have two types: organic nitrogen and inorganic nitrogen. In the culture medium the commonly used organic nitrogen are beef extract, yeast extract and peptone(牛肉膏, 酵母膏和蛋 白胨). Nitrogen source