Author Topic: Will pitching entire package into 1/2 batch compensate for mishandling?  (Read 2282 times)

Offline a10t2

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Re: Will pitching entire package into 1/2 batch compensate for mishandling?
« Reply #15 on: November 08, 2012, 01:40:45 PM »
Just wondering.  I use Mr.Malty and/or Yeastcalc for these type questions and both have a 10% viability at 5 months.  Where does the 25%/month rule of thumb come from?

The MrMalty calculator assumes that viability drops linearly from 100% to 10% over a period of ~3.5 months, then stays at 10%. Which is obviously a very artificial-looking curve, but probably close enough not to cause any problems until you get to very old samples.

Who originated the 25%/month rule, I don't know, but it does track well with cell counts I've done on stored slurry.
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Offline davidgzach

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Re: Will pitching entire package into 1/2 batch compensate for mishandling?
« Reply #16 on: November 08, 2012, 01:59:27 PM »
Just wondering.  I use Mr.Malty and/or Yeastcalc for these type questions and both have a 10% viability at 5 months.  Where does the 25%/month rule of thumb come from?

The MrMalty calculator assumes that viability drops linearly from 100% to 10% over a period of ~3.5 months, then stays at 10%. Which is obviously a very artificial-looking curve, but probably close enough not to cause any problems until you get to very old samples.

Who originated the 25%/month rule, I don't know, but it does track well with cell counts I've done on stored slurry.

I've always wondered about that and the 25%/month curve would make more logical sense. 
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Offline tschmidlin

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Re: Will pitching entire package into 1/2 batch compensate for mishandling?
« Reply #17 on: November 08, 2012, 11:57:22 PM »
(NOTE: My work computer does not have spell check in IE. I apologize for my abismal spelling)
Abysmal.
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Offline davidgzach

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Re: Will pitching entire package into 1/2 batch compensate for mishandling?
« Reply #18 on: November 09, 2012, 05:25:34 AM »
(NOTE: My work computer does not have spell check in IE. I apologize for my abismal spelling)
Abysmal.

LOL, nice Tom!
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Offline euge

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Re: Will pitching entire package into 1/2 batch compensate for mishandling?
« Reply #19 on: November 09, 2012, 06:14:34 AM »
(NOTE: My work computer does not have spell check in IE. I apologize for my abismal spelling)
Abysmal.

LOL, nice Tom!

Ever heard of Firefox Mort? ;)
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Offline morticaixavier

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Re: Will pitching entire package into 1/2 batch compensate for mishandling?
« Reply #20 on: November 09, 2012, 07:47:04 AM »
(NOTE: My work computer does not have spell check in IE. I apologize for my abismal spelling)
Abysmal.

LOL, nice Tom!

Ever heard of Firefox Mort? ;)

Sure, I actually use chrome at home (ha that rhymes) but the work machine is IE whether I like it or not. If I really cared I could always pull the posts over to Word to spell check but it ain't no big thang
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Offline a10t2

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Re: Will pitching entire package into 1/2 batch compensate for mishandling?
« Reply #21 on: November 09, 2012, 09:11:26 AM »
If I really cared I could always pull the posts over to Word to spell check but it ain't no big thang

Thing.
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Offline weithman5

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Re: Will pitching entire package into 1/2 batch compensate for mishandling?
« Reply #22 on: November 09, 2012, 09:18:13 AM »
if you guys don't twit it I will tate my ball and do stwaight home. >:(
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Offline tschmidlin

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Re: Will pitching entire package into 1/2 batch compensate for mishandling?
« Reply #23 on: November 10, 2012, 12:41:21 AM »
If I really cared I could always pull the posts over to Word to spell check but it ain't no big thang

Thing.
;D I was thinking the same thing, the scrolled down a little further.
Tom Schmidlin