HOMEBREW Digest #5455 Fri 21 November 2008

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  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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---------------------------------------------------------------------- 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] Return to table of contents
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 Return to table of contents
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 Return to table of contents
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