1. Dissolve 3.5 g sucrose into 8.8 ml of DMSO
(cell culture grade). Add 62 ml of complete
modified TYI-S-33 medium and an additional 20 ml of heat-inactivated bovine
serum. Mix well on a magnetic stirrer,
then fi lter sterilize with 0.22M filter (i.e.
Millipore Millex syringe driven filter unit)
(DO NOT autoclave). Use immediately or
store at –20°C until use (see #2).
2. Aliquot 5 ml of FM into 15 ml culture tubes
and store at –20°C until use. Vortex aliquots
following defrosting to resuspend the FM.
If you notice that the FM has a white, flaky
precipitate that does not easily go back into
solution discard it (and remaining aliquots
from same sample preparation) and prepare
fresh FM