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20 Dec 2004

Volume 85, Issue 25, pp. 6083-6293

Issue Cover Spotlight Figure

Appl. Phys. Lett. 85, 6281 (2004); http://dx.doi.org/10.1063/1.1834720 (3 pages)

M. P. Rao, M. F. Aimi, and N. C. MacDonald
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Photoelectrical properties of molecular layer consisting of chlorophyll a∕ferredoxin heterostructure

Yun Suk Nam, Jeong-Woo Choi, and Won Hong Lee

Appl. Phys. Lett. 85, 6275 (2004); http://dx.doi.org/10.1063/1.1839648 (3 pages) | Cited 15 times

Online Publication Date: 15 December 2004

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Photoelectrical properties of biomolecular heterostructures are investigated. Ferredoxin and chlorophyll a were used as an electron acceptor and a sensitizer in the heterostructure by mimicking the photosynthesis. Self-assembly layer of ferredoxin was formed on Au-coated glass, and then chlorophyll a was deposited onto the ferredoxin layer by Langmuir–Blodgett method. The photoinduced current flow was observed by repeated step illumination of 488 nm light irradiation. The rectifying property by the scanning-tunneling-spectroscopy-based current–voltage characteristic was achieved in the ferredoxin∕chlorophyll a heterostructure. The ferredoxin∕chlorophyll a heterostructure was functioned as the molecular diode and switching device with photocurrent generation and rectifying property. Proposed molecular diode can be usefully applied for the development of molecular-scale bioelectronic devices such as the diode, switch, and solar cell.
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73.50.Pz Photoconduction and photovoltaic effects
87.50.W- Optical/infrared radiation effects
73.40.Rw Metal-insulator-metal structures
87.15.B- Structure of biomolecules
87.15.M- Spectra of biomolecules

dc Magnetoencephalography: Direct measurement in a magnetically extremely-well shielded room

M. Burghoff, T. H. Sander, A. Schnabel, D. Drung, L. Trahms, G. Curio, and B.-M. Mackert

Appl. Phys. Lett. 85, 6278 (2004); http://dx.doi.org/10.1063/1.1836869 (3 pages) | Cited 16 times

Online Publication Date: 15 December 2004

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Direct measurement of slow brain activity in the range of seconds is reported. The measurements were made by superconducting quantum interference devices operating in a magnetically extremely well-shielded room. Directly measured dc magnetoencephalography (MEG) reveals that sustained fields of the brain rise with a sharp slope immediately after motor stimulation, whereas their relaxation to the resting level is slower and is delayed by several seconds. These features of sustained brain activity could not be resolved by modulated dc MEG which was applied earlier to study these phenomena.
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87.85.Wc Neural engineering
87.50.C- Static and low-frequency electric and magnetic fields effects
87.19.R- Mechanical and electrical properties of tissues and organs
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