( ( ( The contribution ) ( of ( ( these events ) ( to ( particle ( number concentrations ) ) ) ) ) ) ( ( will ( be quantified ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN contribution)) (PP (IN of) (NP (NP (DT these) (NNS events)) (PP (TO to) (NP (NN particle) (NN number) (NNS concentrations)))))) (VP (MD will) (VP (VB be) (VP (VBN quantified)))) (. .)))
The contribution of these events to particle number concentrations will be quantified.
(ROOT (S (NP (NP (DT The) (NN number)) (PP (IN of) (NP (NP (NNS particles)) (PP (IN of) (NP (NP (DT a) (NN substance)) (PP (IN in) (NP (DT a) (VBN given) (NN volume)))))))) (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (DT the) (NN concentration))))) (. .)))