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Nanoscale electrical conductivity of the purple membrane monolayer
Casuso, Ignacio; Fumagalli, Laura; Samitier i Martí, Josep; Padrós, Esteve; Reggiani, L. (Lino), 1941-; Akimov, Vladimir; Gomila Lluch, Gabriel
Universitat de Barcelona
Nanoscale electron transport through the purple membrane monolayer, a two-dimensional crystal lattice of the transmembrane protein bacteriorhodopsin, is studied by conductive atomic force microscopy. We demonstrate that the purple membrane exhibits nonresonant tunneling transport, with two characteristic tunneling regimes depending on the applied voltage (direct and Fowler-Nordheim). Our results show that the purple membrane can carry significant current density at the nanometer scale, several orders of magnitude larger than previously estimated by macroscale measurements.
Enginyeria biomèdica
Biomedical engineering
(c) The American Physical Society, 2007
The American Physical Society

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