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	FORUM ON BEER, HOMEBREWING, AND RELATED ISSUES
		Digest Janitor: pbabcock at hbd.org


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Contents:
  Scientists find gene for yeast flocculation ("Bob Devine")
  Re: The effect of mash parameters on fermentability and efficiency (Fred L Johnson)
  Shipping beer ("Spencer W. Thomas")


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JANITORs on duty: Pat Babcock (pbabcock at hbd dot org), Jason Henning,
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Date: Thu, 20 Nov 2008 20:17:55 -0800
From: "Bob Devine" <devinebob at gmail.com>
Subject: Scientists find gene for yeast flocculation

http://www.popsci.com/scitech/article/2008-11/beer-brings-yeast-together

[quote]
A team of scientists at Harvard University reported last week that
they isolated the single gene that allows yeast to stick together.
That gene allows the normally solitary yeast cells to shield
themselves from toxins in their environment by banding together in
protective balls. Since one of those toxins is the ethanol that the
yeast themselves produce, grouping together allows the yeast to
survive in the alcohol-rich environment that results from brewing.
What's more, the gene has a built in social value system that prevents
yeast cells without the gene from taking advantage of the yeast
flock's protective sphere. That social control mechanism is an example
of how single cells can regulate function in larger units.
[endquote]


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Date: Fri, 21 Nov 2008 06:51:31 -0500
From: Fred L Johnson <FLJohnson52 at nc.rr.com>
Subject: Re: The effect of mash parameters on fermentability and efficiency

I found Kai's results regarding mash thickness vs. brewhouse  
efficiency interesting. Kai's strike water was reverse osmosis water  
at two different ratios relative to the grist, with the higher  
water:grist ratio giving better yield. Because pH was shown in Kai's  
hands to significantly affect yield and because there was no  
adjustment of pH in the experiment testing the effect of water:grist  
ratio, I was wondering if the pH was significantly different in the  
mashes with different water:grist ratios.

Do you have any information on that, Kai?

Fred L Johnson
Apex, North Carolina, USA



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Date: Fri, 21 Nov 2008 14:23:42 -0500
From: "Spencer W. Thomas" <spencer at spencerwthomas.com>
Subject: Shipping beer

Interesting...  I recently shipped a package by UPS using the online 
shipping interface.  I registered my package, paid shipping, and printed 
the label from the ups.com web site.  Nowhere did they ask me what was 
in the package.  I then dropped the prepaid, labeled package at a local 
business that does UPS shipping for no charge.  They didn't ask me what 
was in the package.

You may wish to consider this information when you are looking for a way 
to ship beer to competitions or friends.

=Spencer in Ann Arbor



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