The researchers found that atom collisions were reduced such that their contribution to frequency shifts in the clock was much less than in previous experiments. (sciencedaily.com)
We tried to match up the allele frequency shifts in this experiment with the genome - level differentiation that we observed in our genome - resequencing populations. (sciencedaily.com)
By precisely measuring the orbital movements of MESSENGER using the subtle Doppler frequency shifts of its radio signal, geodesist David Smith of the Massachusetts Institute of Technology in Cambridge and 16 colleagues measured how the pull of gravity varies across Mercury, as the team reports online today in Science. (sciencemag.org)