( For ( ( use ( of carbon-14 ) ) ( ( isotopes ( to ( ( trace ( carbon cycles ) ) ( in photosynthesis ) ) ) ) . ) ) )
(ROOT (S (IN For) (NP (NP (NN use)) (PP (IN of) (NP (CD carbon-14)))) (VP (VBZ isotopes) (S (VP (TO to) (VP (VB trace) (NP (NN carbon) (NNS cycles)) (PP (IN in) (NP (NN photosynthesis))))))) (. .)))
For use of carbon-14 isotopes to trace carbon cycles in photosynthesis.
(ROOT (S (NP (NP (NNP Carbon) (CD 14) (NN isotope)) (PP (IN of) (NP (NN carbon)))) (VP (VBZ is) (ADVP (RB typically)) (VP (VBN used) (PP (TO to) (NP (NN date) (JJ ancient) (NNS items))))) (. .)))