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Isotopic composition of reactants affects the rates of chemical andbiochemical reactions. As a rule, enrichment of heavy stable isotopes leads toslower reactions. But the recent isotopic resonance hypothesis suggests thatthe dependence of the reaction rate upon the enrichment degree is notmonotonous; instead, at some resonance isotopic compositions, the kineticsincreases, while at off resonance compositions the same reactions progressslower. To test the predictions of this hypothesis for the elements C, H, N andO, we designed a precise (standard error plus or minus 0.05%) experiment tomeasure the bacterial growth parameters in minimal media with varying isotopiccompositions. A number of predicted resonance conditions were tested, whichkinetic enhancements as strong as plus 3% discovered at these conditions. Thecombined evidence extremely strongly supports the existence of isotopicresonances. This phenomenon has numerous implications for the origin of lifeand astrobiology, and possible applications in agriculture, biotechnology,medicine and other areas.

Isotopic Resonance Hypothesis: Experimental Verification by Escherichia coli Growth Measurements