You will need
- bottled beer.
Decide what you need the yeast. For example, for beer, and pastry are used to different cultures, and rules of cultivation are different from each other.
To receive bread yeast take the berries, in which they are contained, for example, grapes or plums. Mash them into a puree and add water and sugar in the ratio 3:1:1. Leave the mixture in a warm place for a week. After removing the foam you can dry the mixture and use in breadmaking. Instead of berries you can also take bread, but in this case you will not be able to get a wild yeast culture.
For the cultivation of brewer's yeast find suitable source material. It could be beer intended for ripening in the bottle. It is usually found in German, English or Belgian producers. Of course, beer should not be pasteurised.
Add in a small amount of the selected beverage wort to stimulate growth of the suitable type of yeast. It is made from a milled malt (sprouted barley),cooked with the addition of water and subsequently filtered. The wort in the first stage will need only a few milliliters. Put the bottle in a warm place and wait until the fermentation process begins. You can then add more wort. The result is the cultivation of the yeast should increase in volume at least ten times. You can then use the resulting culture to make beer.
In the preparation of the yeast clean, thoroughly wash all utensils, if necessary even handle her alcohol. This is to ensure that your culture developed is the yeast and not other, extraneous microorganisms.
Home cultivation of yeast is a long and often costly process that for the first time is a good chance that you will not succeed. So think as rationally tasty and healthy dishes can be cooked with manufactured yeast.