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7 Nov 2011

Volume 99, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 99, 193101 (2011); http://dx.doi.org/10.1063/1.3657777 (3 pages)

Sungwook Chung, Jonathan R. Felts, Debin Wang, William P. King, and James J. De Yoreo
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Magnetic actuation of hair cells

David Rowland, Yuttana Roongthumskul, Jae-Hyun Lee, Jinwoo Cheon, and Dolores Bozovic

Appl. Phys. Lett. 99, 193701 (2011); http://dx.doi.org/10.1063/1.3659299 (3 pages) | Cited 1 time

Online Publication Date: 7 November 2011

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The bullfrog sacculus contains mechanically sensitive hair cells whose stereociliary bundles oscillate spontaneously when decoupled from the overlying membrane. Steady-state offsets on the resting position of a hair bundle can suppress or modulate this native motility. To probe the dynamics of spontaneous oscillation in the proximity of the critical point, we describe here a method for mechanical actuation that avoids loading the bundles or contributing to the viscous drag. Magnetite beads were attached to the tips of the stereocilia, and a magnetic probe was used to impose deflections. This technique allowed us to observe the transition from multi-mode to single-mode state in freely oscillating bundles, as well as the crossover from the oscillatory to the quiescent state.
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87.17.Rt Cell adhesion and cell mechanics
87.80.-y Biophysical techniques (research methods)

On the acoustic response of microbubbles in arteriole sized vessels

Mairead B. Butler, David H. Thomas, Nadia Silva, Stephen D. Pye, and Vassilis Sboros

Appl. Phys. Lett. 99, 193702 (2011); http://dx.doi.org/10.1063/1.3657519 (3 pages)

Online Publication Date: 7 November 2011

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Microbubbles are used to improve ultrasound imaging of the vascular bed. Optical microscopy has shown microbubbles in different size tubes which have different responses to ultrasound. The acoustic scatter associated with such differences has not been previously measured. Echoes from two types of microbubbles, in narrow tubes, were collected at incident ultrasound parameters relevant to diagnostic imaging. Microbubbles were found to have increased second harmonic signatures in 50 μm diameter tubes compared to 200 μm. There was decreased survival of lipid microbubbles in the smaller tube. Understanding scatter mechanisms in narrow tubes is useful for signal processing optimisation for imaging applications.
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87.63.dh Ultrasonographic imaging
87.85.Ng Biological signal processing
43.80.Qf Medical diagnosis with acoustics
47.63.Cb Blood flow in cardiovascular system
87.19.rh Fluid transport and rheology
87.19.U- Hemodynamics

Making human enamel and dentin surfaces superwetting for enhanced adhesion

A. Y. Vorobyev and Chunlei Guo

Appl. Phys. Lett. 99, 193703 (2011); http://dx.doi.org/10.1063/1.3660579 (3 pages) | Cited 2 times

Online Publication Date: 11 November 2011

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Good wettability of enamel and dentin surfaces is an important factor in enhancing adhesion of restorative materials in dentistry. In this study, we developed a femtosecond laser surface texturing approach that makes both the enamel and dentine surfaces superwetting. In contrast to the traditional chemical etching that yields random surface structures, this approach produces engineered surface structures. The surface structure engineered and tested here is an array of parallel microgrooves that generates a strong capillary force. Due to the powerful capillary action, water is rapidly sucked into this engineered surface structure and spreads even on a vertical surface.
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87.85.jc Electrical, thermal, and mechanical properties of biological matter
87.85.gf Fluid mechanics and rheology
42.62.Be Biological and medical applications
81.65.Cf Surface cleaning, etching, patterning
68.08.Bc Wetting
68.35.Np Adhesion
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