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[自然百科] 2014-11-10 啤酒是如何酿成的—12

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[Homework]2014-11-10 啤酒是如何酿成的—12

Yeast is a critical ingredient in beer. It has the incredible ability to start the fermentation process, which during brewing turn sugars into alcohol.-There have been examples of bottles of beer that have been found in shipwrecks, that even though they are hundreds of years old, they could take that bottle, isolate that yeast, feed it some sugar and grow it up, allowing brewers to step back in time, and make beer with these ancient yeasts.
In the laboratory at Sierra Nevada Brewing, they propagate their own yeast. In fact, they've been using the same strain since the day they began brewing in 1980.
-So this is a yeast slurry that was taken out of a fermenter and so this is the active yeast that's in one of our fermentation tanks. In the sample here, there are literally millions of yeast cells. So in a milliliter there may be ten to fifteen millions of cells or even up to 40 or 50 million of cells of yeast actively fermenting the sugars into alcohol and carbon dioxide.
Andy Tveekrem, brew-master at Dogfish Head Craft Brewery, keeps an eye on his special strains.
-Brewers are basically yeast wranglers. That's what we do. We play with yeast all day. If our yeast is happy, then the beer tastes good. If the yeast is not happy, then that brewer is not happy.
The little fungi can be temperamental, if they are not kept in proper environment.
-This is just for growing yeast. We put it in this clean-room environment, which we tile all the walls. We put hepa-filtered air, so we don't have any microbial issues. There's no mould or bacteria that can live in this room. It's a pretty sanitary environment.

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