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  1. Friction and Wetting Transitions of Magnetic Droplets on Micropillared Superhydrophobic Surfaces

    Anas Al-Azawi, Mika Latikka, Ville Jokinen, Sami Franssila and Robin H. A. Ras

    Version of Record online: 16 AUG 2017 | DOI: 10.1002/smll.201700860

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    Superhydrophobicity of micropillared surfaces is evaluated using transverse droplet oscillations. The well-defined structure of the surfaces makes it possible to relate the measured droplet friction and energy dissipation to solid fraction. Additionally, controlling the normal force exerted on the magnetic droplet allows the measurement of the impalement pressure and the induced wetting transition for a droplet in motion.

  2. A Nanophotonic Structure Containing Living Photosynthetic Bacteria

    David Coles, Lucas C. Flatten, Thomas Sydney, Emily Hounslow, Semion K. Saikin, Alán Aspuru-Guzik, Vlatko Vedral, Joseph Kuo-Hsiang Tang, Robert A. Taylor, Jason M. Smith and David G. Lidzey

    Version of Record online: 15 AUG 2017 | DOI: 10.1002/smll.201701777

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    Green sulfur bacteria rely on large light harvesting antennae called chlorosomes to absorb light. By placing living bacteria in a photonic microcavity that has a confined optical mode resonant in energy with the chlorosome exciton energy, the system enters the strong coupling regime and forms polariton states. Such states may provide a greater understanding of energy transfer in photosynthetic systems.

  3. Electric and Mechanical Switching of Ferroelectric and Resistive States in Semiconducting BaTiO3–δ Films on Silicon

    Andrés Gómez, José Manuel Vila-Fungueiriño, Rahma Moalla, Guillaume Saint-Girons, Jaume Gázquez, María Varela, Romain Bachelet, Martí Gich, Francisco Rivadulla and Adrián Carretero-Genevrier

    Version of Record online: 15 AUG 2017 | DOI: 10.1002/smll.201701614

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    A new combination of molecular beam epitaxy and a water-based chemical method can amplificate the flexoelectric response of n-type semiconducting BaTiO3−δ thick films by an efficient nanostructuration on silicon substrates of this functional oxide into a columnar geometry. This novel growth mechanism controls the ferroelectric polarization and local conductivity (resistive switching) in epitaxial BaTiO3−δ/La0.7Sr0.3MnO3/SrTiO3/Si columnar nanostructures by a purely mechanical load.

  4. Laser-Induced Focused Ultrasound for Cavitation Treatment: Toward High-Precision Invisible Sonic Scalpel

    Taehwa Lee, Wei Luo, Qiaochu Li, Hakan Demirci and L. Jay Guo

    Version of Record online: 15 AUG 2017 | DOI: 10.1002/smll.201701555

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    A high-precision sonic scalpel is demonstrated using microcavitation generated by a laser-induced focused ultrasound. Rapid growth of microbubbles causes strain in surrounding tissue, ablating it and destroying the tissue structures. Owing to the controllable microcavitation, such sonic ablation would be applicable for high-precision, targeted treatment of diseased tissue.

  5. Piconewton-Scale Analysis of Ras-BRaf Signal Transduction with Single-Molecule Force Spectroscopy

    Chae-Seok Lim, Cheng Wen, Yanghui Sheng, Guangfu Wang, Zhuan Zhou, Shiqiang Wang, Huaye Zhang, Anpei Ye and J. Julius Zhu

    Version of Record online: 15 AUG 2017 | DOI: 10.1002/smll.201701972

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    Intermolecular interactions define signal transduction behavior, yet assessing these interactions remains a daunting task. Here, a single-molecule force spectroscopic method is adpated to funcationally delineate two (≈35 pN and ≈90 pN) interaction sites between signaling effectors Ras and BRaf in the canonical MAPK pathway, and this piconewton analysis approach is independently validated with biochemical, electrophysiological, and behavioral measurements.