Viability of Bacillus popilliae after lyophilization of liquid nitrogen frozen cells.
The per cent viability of Bacillus popilliae after lyophilization of liquid nitrogen frozen cells was determined. Lyophilization of 9- to 12-hr cells which had been suspended in 5% sodium glutamate plus 0.5% gum tragacanth, frozen in liquid nitrogen vapor, and dried 4 to 5 hr with the ampoules exposed to room temperature resulted in survival of 64.6% of the original cells. After storage of these lyophilized preparations for 6 months at room temperature, 10.5% of the original cells were still viable.
D001407:Bacillus / Q000378:metabolism*; D005612:Freeze Drying; D005615:Freezing; D009584:Nitrogen
D009584:Nitrogen