Saccharomyces cerevisiae: Difference between revisions

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==Uses==
==Uses==
===Primary===
===Primary===
* Production of [[ethanol]] and [[carbon dioxide]] via [[fermentation]].
* [[Carbon dioxide]] production. (Leavening bread)
===Secondary===
* [[Ethanol]] production via [[fermentation]].
* Leavening bread
==Natural Occurrence==
* This species of yeast '''does''' occur naturally
==Hazards==
* GRAS ''and'' safe for oral consumption as food.
==Character==
This species:
* is aerobic and a facultative anaerobe.
* can use [[ammonia]] or [[urea]] as the sole nitrogen source, but not nitrates.
* is a top fermenter, meaning it tends to migrate to the top of fluids in which it feeds by maintaining contact with the bubbles of carbon dioxide it produces
* experiences optimum growth between 30–35 °C (86–95 °F)
* this species goes dormant at low temperatures (5°C)
* goes dormant at lower temperatures (5°C)
 
==Cultivation==
==Cultivation==
# Grind 1/2L of grain very fine
# Grind 1/2L of grain very fine
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# Wait one day<br>'''Check:''' If the solution is not fizzing (carbonated, small bubbles rising from within) discard it and repeat from the beginning.
# Wait one day<br>'''Check:''' If the solution is not fizzing (carbonated, small bubbles rising from within) discard it and repeat from the beginning.
# Discard any foam on top of the water
# Discard any foam on top of the water
==See Also==
* [[Mead]]

Revision as of 01:17, 25 June 2019

Saccharomyces cerevisiae
yeast 
Type fungi 
Domain fruit skins

Uses

Primary

Natural Occurrence

  • This species of yeast does occur naturally

Hazards

  • GRAS and safe for oral consumption as food.

Character

This species:

  • is aerobic and a facultative anaerobe.
  • can use ammonia or urea as the sole nitrogen source, but not nitrates.
  • is a top fermenter, meaning it tends to migrate to the top of fluids in which it feeds by maintaining contact with the bubbles of carbon dioxide it produces
  • experiences optimum growth between 30–35 °C (86–95 °F)
  • this species goes dormant at low temperatures (5°C)
  • goes dormant at lower temperatures (5°C)

Cultivation

  1. Grind 1/2L of grain very fine
  2. Mix it into 2L of water
  3. Place the mixture in a well-washed well-rinsed clean bowl with a wide brim
  4. If possible, place a screen or fine-woven mat over the pot in place of a lid. It would let the air flow in freely, but not bugs.
  5. Wait one day
    Check: If the solution is not fizzing (carbonated, small bubbles rising from within) discard it and repeat from the beginning.
  6. Discard any foam on top of the water

See Also