This mucous-like mush that smells like ammonia is made by the action of microbes on soybeans that have been soaked in water. Bacillus spore This is the resting stage of a bacterium like that used to make Natto. Wine Fruit juice is converted to wine with the help of yeast. The same microbe used to make wine can also be used to make bread. Yoghurt Yoghurt is made from fermented milk.
Milk is rich in sugars, particularly the sugar lactose.
Since microbes like sugars, milk is a great feast for microbes. Lactobacilli are the bacteria that convert milk to yoghurt. In the process of using the milk sugar, Lactobacillus produces acid which makes the yoghurt sour and a less hospitable place for other microbes. This bacterium can digest lactose. It produces an acid which gives yoghurt a slightly sour taste.