I am new to this (both home-brew and your forums), and coming from a scientific background my first step was to go around researching as much as I could. Unfortunately like everything which incorporates both art and science, there is considerable disagreement between the various sources.
My current confusion (or rather, point of disagreement) is between one Mark Denny (The author of "Froth!") and one Edcculus, a member of this fine forum. The conflict is as follows:
Mark Denny states:
"A 7g sachet will contain a mere four billion cells, however, and this is not
nearly enough to start a brew."
"Dry or "active" yeast is yeast put in a kind of suspended animation. The manufacturer causes the yeast to store up a bunch of "food" reserves. Most dry yeast packs come in 11-11.5 gram packs, making approximately 220-230 billion cells."
And adjusting for package sizes, this amounts to a discrepancy/disagreement by a factor of 36. Incidentally that puts either source on either side of the "enough cells to innoculate a 5-gallon batch"
Anyone care to cite peer-reviewed sources, as neither have?
Thanks for your time.