7
votes
How long does it take for yeast to mutate into having other characteristics?
Yeast follow the laws of natural selection.
As a cell is budding the new mass may have some minor defects / mutations. If those changes give the yeast an advantage to survive it will get passed on.
...
- 18.5k
5
votes
when does the alcoholic fermentation end?
CO2 in suspension will cause bubbles to come out of the airlock long after the fermentation is done. It is an indicator, but not a precise one.
Experience will tell you that for a particular yeast/...
- 4,806
4
votes
Accepted
Questions on keeping a yeast strain going over and over
'So what exactly is 4 - 6 generations? [...] Are all of those considered generation 2?'
A generation of yeast is considered as having gone from pitching to post-fermentation collection. So if you ...
- 6,417
2
votes
What is the control recipe for official yeast attenuation ratings?
I was able to find at least one paper in which a standardized wort was used to classify many (153) yeast strains based on, among four other parameters, degree of attenuation.
The wort used was an
'...
- 6,417
2
votes
What is the control recipe for official yeast attenuation ratings?
I have veiwed a few papers and this one contained similar proportions to other references but was the only one to contain a reference for the source of the proportions.
Isolation and Characterization ...
- 7,018
2
votes
Yeast washed, combine containers?
If you practice good sanitation.
Decant the water off and combine to save space.
- 18.5k
2
votes
Non Turbo, High Proof Yeast
I'm not aware of any yeast that will pass 20% by any large margin in a pitch-and-forget type of way.
Once you start pushing 16+% and you're not using a distillers yeast- you're looking for multi-stage ...
- 1,773
2
votes
Pink (or salmon) colored colonies on foam in starter flask
I suspect that the source of the infection was glycerin I used, since I perhaps erroneously assumed it should be sterile from a previously unopened container. I found citations that Sporobolomyces in ...
- 257
2
votes
when does the alcoholic fermentation end?
If you don't have an hydrometer, just keep a close eye to the airlock and give it a few days (3-5) after the activity has stopped. Mind that this is not the correct way to do that and there's no ...
1
vote
when does the alcoholic fermentation end?
If you have no other instrumentation, look at the airlock.
If the brew is fermenting, there is always going to be positive pressure against the liquid in the airlock, even when fermentation is ...
- 191
1
vote
How long does it take for yeast to mutate into having other characteristics?
There is no set time and no set form that the mutation will take. But in general, mutations take a long time to happen. Years is the time line often cited.
- 33.4k
1
vote
Reusing yeast at home
I have been banking my yeast when I buy a new strain. Instead of cropping and washing, though, I overbuild my starter, then save half of that yeast. This save a lot of mucking about with washing and ...
- 998
1
vote
Scaling up from a colony
You want to grow the slant up to about 100b cells by a mini starter, I start with 500ml 1.040 with nutrients.
Then treat that as I would a new pack of yeast.
Each step up of a starter takes 12-24 ...
- 18.5k
1
vote
How long can I keep a slant/plate in a domestic fridge/freezer?
A slant/plate made directly from a starter will likely stay viable longer than that picked up from trub. I'd estimate under decent conditions it should be good for up to about 6 months.... longer if ...
- 21
1
vote
Accepted
How long can I keep a slant/plate in a domestic fridge/freezer?
There are really too many factors to give a solid time frame when all the cells will have died.
I've had year old trub I've been able to make starters from.
If I had to pick a safe age I would ...
- 18.5k
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