Janne Blichert-Toft
Janne Blichert-Toft is a geochemist , specializing in the use of isotopes with applications in understanding planetary mantle-crust evolution , as well as the chemical composition of matter in the universe . 
<triplet> isotopes <subj> geochemist <obj> subclass of <triplet> chemical composition of matter in the universe <subj> geochemist <obj> subclass of