This is cool. Ammonia is poisonous. Yeast in a potassium poor medium are poisoned by ammonia in that medium; nitrogen and potassium being similar enough for nitrogen to slip through a potassium channel if potassium isn't there to block it.
http://biology.plosjournals.org/perlserv/?request=get-document&doi=10.1371/journal.pbio.0040389&ct=1
Foie Gras (8) Vaughan's macrophages
4 days ago
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