Preserving Bacteria Cultures 。Deep-freezing:-50°to-95°C 。Lyophilization(freeze-drying):Frozen(-54°to-72°C) and dehydrated in a vacuum • Deep-freezing: -50°to -95°C • Lyophilization (freeze-drying): Frozen (-54° to -72°C) and dehydrated in a vacuum Preserving Bacteria Cultures