Saccharomyces cerevisiae: Difference between revisions
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* can use [[ammonia]] or [[urea]] as the sole nitrogen source, but not nitrates. | * 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 | * 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 | * experiences optimum growth between 30–35 °C (86–95 °F) | ||
* produces maximum [[carbon dioxide]] at 31°C | |||
* this species goes dormant at low temperatures (5°C) | * this species goes dormant at low temperatures (5°C) | ||
* goes dormant at lower temperatures (5°C) | * goes dormant at lower temperatures (5°C) |
Revision as of 12:46, 22 September 2019
Type | fungi |
---|---|
Domain | fruit skins |
Uses
Primary
- Carbon dioxide production. (Leavening bread)
- Ethanol production via fermentation.
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)
- produces maximum carbon dioxide at 31°C
- this species goes dormant at low temperatures (5°C)
- goes dormant at lower temperatures (5°C)
Cultivation
- Grind 1/2L of grain very fine
- Mix it into 2L of water
- Place the mixture in a well-washed well-rinsed clean bowl with a wide brim
- 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.
- Wait one day
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