Q&A for How to Grow Yeast

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  • Question
    How does yeast grow?
    Community Answer
    It goes though mitosis, like all living organisms do. Interphase is when the cell grows and replicates its DNA, then goes through the 4 stages of mitosis: Prophase, Metaphase, Anaphase, and Telophase. At the end one cell (mother cell) has divided into two cells (daughter cells), each having the same contents that the mother cell possessed. Each cell then divides into two more cells, and so on.
  • Question
    Can I use self-rising flour to grow yeast?
    Community Answer
    Self-rising flour is basically just a mixture of baking powder (sometimes salt) and flour. The baking powder and salt might kill the yeast, so I would not recommend it.
  • Question
    Can I freeze active yeast?
    Community Answer
    You really shouldn't. Active yeast cells have water in them. When you freeze water, it forms crystals which expand and that will kill the yeast cells.
  • Question
    How can I convert my yeast growth to active dry granulated yeast?
    Community Answer
    You can't do that unless you have extensive laboratory/factory equipment at home. Homemade yeast will always stay "wet," and attempting to dry the culture at home will most likely result in the yeast dying.
  • Question
    What makes yeast grow?
    Community Answer
    Usually optimal environmental settings will help with the growth of yeast; for example, light levels, temperature, and humidity all play a part in the growth of yeast. If you're referring to the physical mechanism of growth, yeast grows by feeding on sugars.
  • Question
    What do I do if the jar is full?
    Community Answer
    Take out a portion and keep the mixture refrigerated in order to slow down growth or make the yeast dormant. Do not freeze the mixture.
  • Question
    Can I use this method to cultivate certain strains of yeast?
    Sciencesid
    Community Answer
    Yes, as long as you make sure there are no contaminations, and you use bleached flour for food so that the unnaturally introduced strain does not get crowded out.
  • Question
    In brewing, different strains of yeast produce different levels of ABV. How can I grow a strain specifically for higher ABV levels?
    Jeff Robinson
    Community Answer
    Certain yeasts can tolerate higher levels of alcohol, which is their byproduct of feeding (eating the sugars supplied by the malt/wort). Different yeasts don’t produce more alcohol or less, but can survive in higher alcohol environments. So basically to make higher ABV, you need to give the yeast more sugar with a yeast strain that can tolerate the higher levels of alcohol. I know my local wine making shop has kits with this higher tolerant yeast along with instructions to brew higher ABV beverage (not using a still).
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