Fraction of cells still viable after a number of days.
viability = initial × retention30^(days /30)
This assumes refrigerated storage the whole time. A pack that spent a week
in a warm postal van decays much faster, and we have no way of knowing
that, so the retention constant can be overridden.
Fraction of cells still viable after a number of days.
This assumes refrigerated storage the whole time. A pack that spent a week in a warm postal van decays much faster, and we have no way of knowing that, so the retention constant can be overridden.