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Contents
- Sweet Confusion: Does high fructose corn syrup deserve such a bad rap?
- Closed Thinking: Without scientific competition and open debate, much psychology research goes nowhere
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Contents
- Better chow yields more milk: A more nutritious form of corn for dairy cows boosts farm profits, teen investigator finds
- Fuzzy future: Kids may suffer impaired vision from spending too little time outdoors, studies suggest
- Building with moon rocks: Working on the moon with lunar soil and grit could prove easier, more efficient and less costly than using earthly materials
Web edition: July 15, 2011
Print edition: July 30, 2011; Vol.180 #3 (p. 4)
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. Eventually a second population of survivors began to appear, resembling the original bacteria in every respect except that they had just enough resistance to copper to grow slowly in the presence of that poison. Finally, the completely resistant variants disappeared.
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