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26 Nov 2012

Volume 101, Issue 22, Articles (22xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 101, 221101 (2012); http://dx.doi.org/10.1063/1.4767646 (5 pages)

Mikhail A. Kats, Deepika Sharma, Jiao Lin, Patrice Genevet, Romain Blanchard, Zheng Yang, M. Mumtaz Qazilbash, D. N. Basov, Shriram Ramanathan, and Federico Capasso
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Extremely slow photocurrent response from hemoprotein films in planar diode geometry

Sungho Nam, Hwajeong Kim, Patrick Degenaar, Chang-Sik Ha, and Youngkyoo Kim

Appl. Phys. Lett. 101, 223701 (2012); http://dx.doi.org/10.1063/1.4764948 (4 pages)

Online Publication Date: 26 November 2012

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The photocurrent response in solid-state films of two different hemoproteins, horseradish peroxidase and cytochrome c, was studied by employing a geometry of planar diode device. The highest occupied molecular orbital energy of the two solid-state hemoproteins was measured using photoelectron yield spectroscopy. Results showed that the photocurrent response of hemoprotein films under white light illumination was found extremely slow (ca. 160–480 s) owing to the charge blocking by insulating surrounding parts of which size resulted in largely different photocurrent time scale between the two hemoprotein films.
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87.14.E- Proteins
87.15.Pc Electronic and electrical properties
87.64.ks Electron and photoelectron
87.85.jc Electrical, thermal, and mechanical properties of biological matter
79.60.-i Photoemission and photoelectron spectra
85.60.Dw Photodiodes; phototransistors; photoresistors

Mapping of native inorganic elements and injected nanoparticles in a biological organ with laser-induced plasma

V. Motto-Ros, L. Sancey, Q. L. Ma, F. Lux, X. S. Bai, X. C. Wang, Jin Yu, G. Panczer, and O. Tillement

Appl. Phys. Lett. 101, 223702 (2012); http://dx.doi.org/10.1063/1.4768777 (4 pages)

Online Publication Date: 27 November 2012

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Emission spectroscopy of laser-induced plasma from a thin section of mouse kidney successfully detected inorganic elements, Na, Ca, Cu, and Gd, naturally contained in the organ or artificially injected in the form of Gd-based nanoparticle. A two-dimensional scan of the sample allowed the laser beam to explore its surface with a resolution of 100 μm, resulting in a quantitative elemental mapping of the organ with sub-mM sensitivity. The compatibility of the setup with standard optical microscopy emphasizes the potential to provide multiple images of a same biological tissue with different types of response which can be elemental, molecular, or cellular.
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87.64.Cc Scattering of visible, uv, and infrared radiation
82.80.Dx Analytical methods involving electronic spectroscopy

Feedback controller for destroying synchrony in an array of the FitzHugh–Nagumo oscillators

Arūnas Tamaševičius, Elena Tamaševičiūtė, and Gytis Mykolaitis

Appl. Phys. Lett. 101, 223703 (2012); http://dx.doi.org/10.1063/1.4768938 (5 pages)

Online Publication Date: 27 November 2012

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We describe an implementation of an electronic feedback controller, destroying synchrony and/or suppressing the mean field in arrays of globally coupled nonidentical oscillators. We demonstrate that the mean field, either artificially nullified or fed back into the array with a negative sign can break up the phase synchronization. The experiments have been carried out with an array of thirty electronic oscillators, imitating dynamical behavior of the spiking neurons. We have found that the negative mean-field technique, depending on the control parameter, can either desynchronize or synchronize the oscillators, whereas in the both cases, it ensures low mean-field voltage.
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05.45.Xt Synchronization; coupled oscillators
84.30.Ng Oscillators, pulse generators, and function generators

Studying DNA translocation in nanocapillaries using single molecule fluorescence

Vivek V. Thacker, Sandip Ghosal, Silvia Hernández-Ainsa, Nicholas A. W. Bell, and Ulrich F. Keyser

Appl. Phys. Lett. 101, 223704 (2012); http://dx.doi.org/10.1063/1.4768929 (4 pages) | Cited 1 time

Online Publication Date: 30 November 2012

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We demonstrate simultaneous measurements of DNA translocation into glass nanopores using ionic current detection and fluorescent imaging. We verify the correspondence between the passage of a single DNA molecule through the nanopore and the accompanying characteristic ionic current blockage. By tracking the motion of individual DNA molecules in the nanocapillary perpendicular to the optical axis and using a model, we can extract an effective mobility constant for DNA in our geometry under high electric fields.
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87.15.hj Transport dynamics
87.16.dp Transport, including channels, pores, and lateral diffusion
87.14.gk DNA

Cell electroporation chip using multiple electric field zones in a single channel

Min-Ji Kim, Taeyoon Kim, and Young-Ho Cho

Appl. Phys. Lett. 101, 223705 (2012); http://dx.doi.org/10.1063/1.4769037 (4 pages)

Online Publication Date: 30 November 2012

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We present cell electroporation chip using a single channel with multiple electric field, E, zones. The present chip, where multiple E zones are generated by a pair of external electrodes across a stepwise single channel, provides the optimal E conditions for stable cell electroporation with high viability in a single experiment. The optimal E for both H23 and A549 cells was 0.4 kV/cm with the maximum percentage of the viable and electroporated cells of 51.4 ± 3.0% and 26.6 ± 0.7%, respectively. The present cell electroporation chip has potential for use in integrated cell chips to find the optimal E conditions for the electroporation study.
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87.50.cj Electroporation/membrane effects
87.80.-y Biophysical techniques (research methods)
87.16.dp Transport, including channels, pores, and lateral diffusion
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