![]() ![]() In this way, Lenski and his team have studied more than seventy thousand generations of E. coli a day the bacteria woke up as babies and went to bed as great-great-great-grandparents. Lenski’s flasks produced about six new generations of E. How quickly, effectively, creatively, and consistently do microorganisms improve their reproductive fitness? His goal was to understand the mechanics of evolution. Each day, as the bacteria replicated, Lenski transferred several drops of each cocktail to a new flask, and every so often he stored samples away in a freezer. Each flask was kept at thirty-seven degrees Celsius, and contained an identical cocktail of water, glucose, and other nutrients. He divided a population of a common bacterium, E. In 1988, Richard Lenski, a thirty-one-year-old biologist at UC Irvine, started an experiment. ![]()
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