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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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ScienceShot: Why Bacteria Commit Suicide
19 March 2013 8:01 pm
Suicide is an evolutionary puzzle. Why should an organism kill itself when it could be having offspring? Now, researchers have shown that in bacteria, suicide can be worthwhile—and has no major downside. Scientists compared two strains of Escherichia coli bacteria, one that self-destructs when infected with a lethal virus and one that doesn’t. An infected bacterium not only dies but also serves as an incubator for some 300 new virus particles, unless it kills itself first. When the researchers seeded a batch of the suicidal bacteria with the virus, the bacteria thrived, they report online today in the Proceedings of the Royal Society B. That’s because infected individuals self-destructed before they could spread the virus to others. A batch of the nonsuicidal bacteria, however, perished when infected. When both kinds of bacteria and the virus were mixed together under varying conditions, the suicidal strain fared better (as seen in the image, showing green colonies of the suicidal strain to be unscathed, while pink colonies of the nonsuicidal strain have been nibbled away by the virus). That shows there’s no significant cost to suicidal tendencies. After all, infected bacteria are too feeble to reproduce, the researchers point out. So for these microbes, at least, the old song is right: Suicide is painless, as well as a blessing to one’s neighbors.
See more ScienceShots.