( ( Electrophysiological experiments ) ( ( have ( revealed ( that ( ( these ( regulatory molecules ) ) ( modulate ( ( ion ( transport processes ) ) ( in ( the ( guard ( cell membrane ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Electrophysiological) (NNS experiments)) (VP (VBP have) (VP (VBN revealed) (SBAR (IN that) (S (NP (DT these) (JJ regulatory) (NNS molecules)) (VP (VBP modulate) (NP (NP (NN ion) (NN transport) (NNS processes)) (PP (IN in) (NP (DT the) (NN guard) (NN cell) (NN membrane))))))))) (. .)))
Electrophysiological experiments have revealed that these regulatory molecules modulate ion transport processes in the guard cell membrane.
(ROOT (S (NP (DT The) (NN term) (JJ passive) (NN transport)) (VP (VBZ describes) (NP (DT a) (NN way)) (SBAR (IN that) (S (NP (JJ small) (NNS molecules) (CC or) (NNS ions)) (VP (VBP move) (PP (IN across) (NP (NP (DT the) (NN cell)) (VP (VBN membrane) (PP (IN without) (NP (NP (NN input)) (PP (IN of) (NP (NN energy))))) (PP (IN by) (NP (DT the) (NN cell)))))))))) (. .)))