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26 Dec 2011

Volume 99, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 99, 261101 (2011); http://dx.doi.org/10.1063/1.3660243 (3 pages)

T. Schwarzbäck, H. Kahle, M. Eichfelder, R. Roßbach, M. Jetter, and P. Michler
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Control of selective adsorption behavior of Ti-binding ferritin on a SiO2 substrate by atomic-scale modulation of local surface charges

Tatsuya Hashimoto, Kentaro Gamo, Megumi Fukuta, Bin Zheng, Nobuyuki Zettsu, Ichiro Yamashita, Yukiharu Uraoka, and Heiji Watanabe

Appl. Phys. Lett. 99, 263701 (2011); http://dx.doi.org/10.1063/1.3672043 (4 pages) | Cited 1 time

Online Publication Date: 27 December 2011

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We have systematically investigated the influence of local surface potential distribution on selective adsorption of Ti-binding ferritin (TBF) on SiO2 substrates. We found that the TBF exhibits the adsorption ability onto Ti-decorated SiO2 surface of less than one atomic layer coverage. This experimental finding enabled us to propose a model in which the positively charged sites and their nanometer-scale interval are the dominant factors that determine bond strength between TBF and SiO2 surfaces. Furthermore, on the basis of this model, the adsorption behavior of TBF onto bare SiO2 surfaces was controlled by generation and/or recovery of electrical defects in SiO2.
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68.43.Mn Adsorption kinetics
68.35.B- Structure of clean surfaces (and surface reconstruction)
87.14.E- Proteins

Extracellular voltage noise probes the interface between retina and silicon chip

Ralf Zeitler, Peter Fromherz, and Günther Zeck

Appl. Phys. Lett. 99, 263702 (2011); http://dx.doi.org/10.1063/1.3672224 (3 pages)

Online Publication Date: 28 December 2011

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Neuroprosthetic devices rely on a tight contact between electrodes and neurons in the interfaced tissue. A simple method to probe the contact properties in a non-invasive way would be highly attractive. Here we show for retinal tissue that crucial electrical properties of the interface can be extracted from the voltage noise that is recorded with an array of capacitive sensors. The monitoring of the interface properties, which are either interpreted as variable local conductivities or as a cleft of varying distance, allows assessment of the long-term efficiency of neuroprosthetic devices.
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87.85.E- Neural prosthetics
87.85.D- Applied neuroscience
87.19.lc Noise in the nervous system
87.50.cf Biophysical mechanisms of interaction

Direct observation of dynamic force propagation between focal adhesions of cells on microposts by atomic force microscopy

Akinori Okada, Yusuke Mizutani, Agus Subagyo, Hirotaka Hosoi, Motonori Nakamura, Kazuhisa Sueoka, Koichi Kawahara, and Takaharu Okajima

Appl. Phys. Lett. 99, 263703 (2011); http://dx.doi.org/10.1063/1.3672225 (3 pages)

Online Publication Date: 29 December 2011

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We investigated dynamic force propagation between focal adhesions of fibroblast cells cultured on polydimethylsiloxane micropost substrates, by atomic force microscopy. Live cells were mechanically modulated by the atomic force microscopy probe bound to cell apical surfaces at 0.01–0.5 Hz, while microposts served as a force sensor at basal surfaces. We observed that cells exhibited rheological behavior at the apical surface but had no apparent out-of-phase response at the basal surface, indicating that the dynamic force propagating through cytoskeletal filaments behaves in an elastic manner. Moreover, the direction of the propagated force was observed to be intimately associated with the prestress.
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87.17.Rt Cell adhesion and cell mechanics
87.64.Dz Scanning tunneling and atomic force microscopy
87.80.Ek Mechanical and micromechanical techniques

More evidence of the crucial roles of surface superhydrophobicity in free and safe maneuver of water strider

Yewang Su, Shijie He, Baohua Ji, Yonggang Huang, and Keh-Chih Hwang

Appl. Phys. Lett. 99, 263704 (2011); http://dx.doi.org/10.1063/1.3673326 (3 pages) | Cited 2 times

Online Publication Date: 30 December 2011

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This letter presents a study of the effect of surface superhydrophobicity on piercing force and detaching force of water strider’s leg when it vertically contact with water surface. We showed that in contrast to the parallel contact of the leg with water at which the piercing force is insensitive to the contact angle which raised much debate on the functions of superhydrophobicity of water strider’s leg, the piercing force of the vertical contact is, however, very sensitive to the contact angle, which then suggests the surface superhydrophobicity is indeed crucial for water strider’s free and safe activities on water surface.
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68.03.Cd Surface tension and related phenomena
68.08.Bc Wetting
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