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Lean and mean

作者:虞巽趔    发布时间:2019-03-07 03:04:04    

WHEN the going gets tough, bacteria get rid of the genes they don’t need, biologists in Hungary have found. Tibor Vellai and his colleagues at Eötvös Loránd University in Budapest starved Escherichia coli for 55 days and found that the population lost a gene for antibiotic resistance—which the bacteria were not using under the conditions of the experiment. Bacteria that were not starved retained the gene (Proceedings of the Royal Society B, vol 266, p 1953). “The loss of genetic information occurs at random within the whole genome,” says Vellai. The process kills individual cells if it disrupts essential genes,

 

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