When you guys use the dishwasher, how can you be sure that the spray is getting up in to the bottles? It seems like that is a pretty small hole for the spray to get all the way up in to.
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Well, this is a quote from Wyeast's website technical section, yeast fundamentals page
" Ale and lager yeasts are currently both classified as Saccharomyces cerevisiae"
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Saccharomyces cerevisiae in Latin translates roughly to sugar fungus (Saccharomyces) of beer (cerevisiae). It's no coincidence that the Spanish word for beer is cerveza.
At one point, all brewing strains were classified as Saccharomyces cerevisiae (the species also includes wine and baker's yeast). However, the field of yeast genetics has determined that lager strains are hybrids of two different species within the Saccharomyces genus; namely, Saccharomyces cerevisiae and Saccharomyces eubayanus. The Latin name for this hybrid is Sacchormyces pastorianus. Furthermore, the field of yeast genetics has determined that their are two genetically different yeast families within the S. pastorianus species; namely, Frohberg and Saaz. Here's a link to a recent paper that sheds new light on the Frohberg and Saaz families: http://www.g3journal.org/content/early/2014/02/26/g3.113.010090.full.pdf+html. The researchers sequenced Carlsberg Bottom Yeast No. 1 (the first pure culture lager strain, which is also a Saaz strain) and W-34/70 (which is a Frohberg strain) for the study.