General Category > Yeast and Fermentation

Yeast culturing queries.

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enso:
I am just getting started with this and I have done a lot of reading on various web pages about culturing for and by homebrewers.  I think I have a fair idea of what to do, hands on is the best way to learn though...

I do have a few things I am unclear on.  The first is the goal of preparing slants.  I understand that streaking plates is to isolate singular colonies.  Slants seem to be more for storage?  Why are slants better for storage?  What is the goal of a properly prepared slant?  What should it be like?  I have read about people refering to a "lawn of yeast".  Does this mean your aim is to completely cover the top surface of the agar in the slant with yeast?  How does one go about this?  Meaning, if you apply yeast to the plate with the aim of having the least amount of cells, how do you achieve maximum coverage when aplying to the slant.

Not sure if my questions are clear or not, but hopefully with a bit of discussion we can clear my fog.   :D

Kaiser:
Slants are great medium length storage (up to 6 months) since the have a much smaller opening and thus easier to keep from getting contaminated or dried out.

To innoculate them just pick a colony with the loop and spread it around. Cover a lot of the surface but don't get anal about it. Zig-zag over the slant is sufficient. Then let it grow at room temp before storing at 2-4c. I don't go lower due to the risk of accidental freezing.

Kai

Thirsty_Monk:
You could read about my adventure in Yeast Culturing in here:
http://www.homebrewersassociation.org/forum/index.php?topic=901.0

There are some pictures too as well as recipe for solid media.

"lawn of yeast" is continues streak where you can not isolate yeast colonies.
You try to streak for individual colonies and you do not want to have lawn.

roffenburger:
Here is what I do for slants.

Pick up some yeast with a loop, go all the way to the bottom of the slant and pull straight up. Then, go back to the bottom and zigzag across your first "pull."
A quick paint file...

enso:
cool.  Thank you folks.   ;D

Just unpacked my order!  Cynmar is great.  The order came really fast!  I placed it earlier this week.  I am STILL waiting on an order I placed with More Beer (including some overpriced yeast culturing supplies!) over a month ago...   :'(

I can't wait to get started.  I am going to try the sterile distilled water storage method in addition to agar slants.  It is good to know the options.

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