Washington - Scientists at Harvard University (USA) presented a model from which you can see the resistance of bacteria to antibiotics designed to stop them or eliminate them.
For his experiment, published Friday in the journal "Science", the researchers created a rectangular Petri dish four feet (122 cm) long and two feet (61 cm) wide with nine horizontal compartments.
In compartments of the two extremes, the Harvard scientists have introduced no remedy at all, while in the immediately adjacent put a dose of trimethoprim in the following an amount 10 times of that antibiotic in the other 100 times and central thousand times greater than the first.
Scientists then introduced doses of bacteria Escherichia coli, also known as E.coli at the ends and during the ten days was confirmed as advancing to reach the central compartment and mutate to superbug.
In its conclusions, the scientists showed how the first bacteria with low resistance to antibiotics "have given way to moderate resistance mutants that eventually produced highly resistant strains and able to defend the highest doses of antibiotics."
"Every level of concentration, a small group was adapted and survived," the study, to find that the descendants of the mutant bacteria "migrated to higher antibiotic concentration areas".
What allowed the Petri dish was "to recognize concepts with which it was thought in the abstract," noted the researcher Tami Lieberman, who participated in the experiment described as "an impressive demonstration of the speed of how bacteria evolve."
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