( Besides ( , ( ( ( the ( exchange reactions ) ) ( of ( deuterium ( between ( ( hydrogen and ) water ) ) ) ) ) ( ( ( ( require ( a ( ( ( slow and ) suitable ) catalyst ) ) ) , ) ( ( taking ( into account ) ) ( ( the ( slow nature ) ) ( of ( these reactions ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (IN Besides)) (, ,) (NP (NP (DT the) (NN exchange) (NNS reactions)) (PP (IN of) (NP (NP (NN deuterium)) (PP (IN between) (NP (NN hydrogen) (CC and) (NN water)))))) (VP (VBP require) (NP (DT a) (ADJP (JJ slow) (CC and) (JJ suitable)) (NN catalyst)) (, ,) (S (VP (VBG taking) (PP (IN into) (NP (NN account))) (NP (NP (DT the) (JJ slow) (NN nature)) (PP (IN of) (NP (DT these) (NNS reactions))))))) (. .)))
Besides, the exchange reactions of deuterium between hydrogen and water require a slow and suitable catalyst, taking into account the slow nature of these reactions.
(ROOT (S (SBAR (IN If) (S (NP (DT a) (NN catalyst)) (VP (VBZ runs) (PRT (RP out))))) (, ,) (NP (DT the) (NN reaction)) (VP (VBZ slows)) (. .)))