I'll start by saying thanks very much for the FOY opportunity. Recently I saw a note that a 2L starter made using a "vial" of yeast containing 30-60 billion cells would grow to 240 billion cells. Since the note appeared to be general, the assumption would have to be an aerated starter when made and then left to sit with no swirling or further aeration.

As others have mentioned, thank you very much for the opportunity... My question is on yeast cell counts within a starter. Assuming one began with a 1L of 1.040 starter wort, and 50 ml of yeast containing 15 billion cells that has an Apparent Attenuation of 75%:

Dr. Fischborn and Dr. Waldrop: Some time ago I was counting cells and then looked at the datasheets for Windsor and Nottingham and it says (among other things) :

Nottingham contains >= 5 billion viable cells / g(dw)
Windsor contains >= 7 billion viable cells / g(dw)