SF Lager Lab Results

Strain: SF Lager Testing Date: 1/11/2013 Viability: 94% Total viable cell density: 937 million cells per ml Thick viable cell density: TBD Stress level: Low, Similar characteristic flavors to previous batch. Bacteria level: Low, Sourness unlikely. (0.13% bacteria per viable cell)

 

Suggested Pitch Rates:

OG	Pitch rate	Volume of homogenized slurry	Volume of settled cells (Thick cell layer)
1.030	100 billion cells for 5 gallons	106 ml	TBD
1.050	175 billion cells for 5 gallons	187 ml	TBD
1.070	250 billion cells for 5 gallons	267 ml	TBD

Viability – Percentage of live cells of the entire cell population

Total Viable Cell Density – The number of viable cells in one milliliter of homogenized slurry.

Thick Viable Cell Density – The number of viable cells in one milliliter of settled cells such as those at the bottom of a starter that has been refrigerated.

Stress Level – A rudimentary assessment of cell health based on cellular morphology. 

Bacteria – The percentage of visible bacteria of the yeast population

Other notes:

This is one of the healthiest yeast cultures that I have looked at in a while.  There is very little protein or hop trub.  The cells that could be mold were very scarce, and also have stained blue indicating that they are dead.  These are normally found in tubing or valves.  It looks like you must be doing a good job of cleaning them because the mold is dead.

Disclaimer:

This report is an evaluation of the sample that was provided.  There are no guarantees.  The sample may perform differently than the slurry for a number of reasons that are beyond control.  Care is taken to provide accurate results, however measurement error due to equipment tolerances, process, and calibration will create deviation in measurement from absolute values. This is not an evaluation of health or safety risks.