Sentences with phrase «heavier isotopic signature»
Because life prefers lighter carbon, the isotopes suggest to some scientists that the atmospheric rise must be due to extra microbial production, and not a boost due to leaked gas from fracking operations, which has a heavier isotopic signature.
http://www.sciencemag.org/ Not exact matches
Sharpe admits that's a possibility, but she thinks the dogs» isotopic signature doesn't quite match the signal you'd expect from dogs consuming maize - heavy feces.