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Join Date:

10-01-2012

Last Activity:

12-21-2014 6:29 AM

Likes Given: 59

140 Likes on 136 Posts 

    ABOUT ME

  • Brewing beer has been a passion of mine since my first extract brew in the late 1990's. Whether it's recipe design, or critiquing a brew, and everything in between it's all exciting to me.
  • Electrical Engineer.
  • Male
  • Married
  • Malden
  • Massachusetts

LATEST ACTIVITY

  • Posted in thread: Simple yeast starter question on 12-21-2014 at 11:29 AM
    High activity normally indicates a high growth rate. Yeast growth can be thought of as a
    reaction. The rate at which the reaction occurs is proportional to the concentration of the
    reagents. So if you...

  • Posted in thread: Simple yeast starter question on 12-20-2014 at 11:38 PM
    Biomass yield is almost entirely driven by the amount of extract. Each gram of DME will yield
    about 1 billion cells. As long as gravity and pitch rate are within reason they have very
    little effect on...

  • Posted in thread: Fermentation Performance of Refrigerated Yeast Slurry on 12-20-2014 at 04:20 PM
    The difference between Jamil's and Kai's calc is crazy sometimes. On my last batch, Jamil was
    telling me I made 125B cells and Kai was telling me 240B. It really end up feeling like a shot
    in the dark...

  • Posted in thread: Which yeast pitching calculator do you use? Prefer one over the other? on 12-20-2014 at 01:04 PM
    You can infer the numbers that I got in this experiment: agree that although 20 billion per
    gram is the standard number used for conversion, the actual number will vary.

  • Posted in thread: poor attenuation with S04 on 12-20-2014 at 01:33 AM
    Interesting. It could be the mash being a little too warm, or yeast vitality. How long did the
    yeast float when it was rehydrated? What was the volume of wort? When did you dump the yeast
    the first ti...

  • Posted in thread: Fermentation Performance of Refrigerated Yeast Slurry on 12-20-2014 at 01:18 AM
    I think this is a great idea. Not sure the testing of the frozen samples will provide much new
    data, since I would expect everyone who freezes yeast will treat it as thou only few survive
    and go thru ...

  • Posted in thread: Which yeast pitching calculator do you use? Prefer one over the other? on 12-19-2014 at 11:39 PM
    Yes, 20 billion cells per gram is value that is commonly used to convert CDW to number of
    cells. Brewers friend may be assuming 50% viability which is pretty much what you would get if
    you just dumped...

  • Posted in thread: Fermentation Performance of Refrigerated Yeast Slurry on 12-19-2014 at 11:57 AM
    I think most homebrewers either store the saved yeast under water (ala yeast rinsing) or in the
    beer that was made, so it'd vary from nearly 0% ABV to 6-8% ABV. I think the best practical
    experiments ...

  • Posted in thread: Fermentation Performance of Refrigerated Yeast Slurry on 12-19-2014 at 02:15 AM
    I would be interested in seeing what some techniques do to improve storage life compared to
    storage under beer. Maybe store under water with pH adjusted to 4 or so.That's a good idea,
    although I'd lik...

  • Posted in thread: Fermentation Performance of Refrigerated Yeast Slurry on 12-19-2014 at 02:00 AM
    Well, starter beer isn't really beer, is it? Hopped wort will slow yeast growth, maybe it
    either enhances or diminishes the storage viability?Your right, using the strict definition if
    it doesn't have...

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