( ( Studies ( of ( ( ion transport ) ( across ( taste cell ) ) ) ) ) ( membranes . ) )
(ROOT (S (NP (NP (NNS Studies)) (PP (IN of) (NP (NP (NN ion) (NN transport)) (PP (IN across) (NP (NN taste) (NN cell)))))) (VP (VBZ membranes)) (. .)))
Studies of ion transport across taste cell membranes.
(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)))))))))) (. .)))