Can you kill bacteria by dropping it to a certain temperature?
It depends on the time and temperature. Lets say, you drop the temperature of the bacteria's environment to -50 degrees C for 1 minutes. It would have a larger possibility of making the inner bacterial plasma to freeze and expand thus breaking the cell wall and killing the bacteria then you expose the bacteria to - 100 degrees for 0.001 second. But do be aware of bacterias that have anti-freeze capabilities in their genes. They might stand extreme cold temperature without dying because the anti freeze genes produce anti freeze proteins that help delay the plasma from freezing. But for sure, all beings have their limits eh.... we just don't know the limits are... -RPW-