Science Past from the issue of July 29, 1961

By Science News, 13:06 PM July 14, 2011

RADIATION SURVIVORS — A world-wide radiation disaster might eventually give rise to two populations, research on bacteria indicates.… Starting with a culture of ordinary (wild-type) bacteria, the scientist added copper ions that produced a “disaster.” Most of the bacteria died…. But as time passed, a small number of survivors, called variants, began reproducing at a rapid rate. They were resistant to effects of poisonous copper and differed in many ways from ordinary bacteria. Eventual...

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