( ( ( ( Strong reactions ) , ) ( both ( ( positive and ) negative ) ) ) ; )
(ROOT (NP (NP (JJ Strong) (NNS reactions)) (, ,) (NP (NP (DT both)) (ADJP (JJ positive) (CC and) (JJ negative))) (: ;)))
Strong reactions, both positive and negative;
(ROOT (S (S (VP (VBZ Is) (NP (NP (DT the) (NN heat)) (PP (IN of) (NP (NP (NN reaction)) (PP (IN for) (NP (DT an) (JJ endothermic) (NN reaction)))))))) (VP (VBZ is) (ADJP (JJ positive))) (. .)))