Aschen technology includes a bio-weapon which contains living radioactive genetic material designed to attack and destroy only the specific DNA of the enemy. When SG-1 discovered the truth behind the Aschen plot to conquer Earth and broke off all negotiations, Mollem attempted to destroy Earth by sending the bio-weapon through the stargate. The device was stopped by the iris, and Earth was spared.
Cross Reference: Aschen, Mollem
Episode Reference: 2001