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M Hamoumi, P E Allain, W Hease, E Gil-Santos, L Morgenroth, B Gérard, A Lemaître, G Leo, I Favero
We report on a systematic study of nanomechanical dissipation in high-frequency (≈300  MHz) gallium arsenide optomechanical disk resonators, in conditions where clamping and fluidic losses are negligible. Phonon-phonon interactions are shown to contribute with a loss background fading away at cryogenic temperatures (3 K). Atomic layer deposition of alumina at the surface modifies the quality factor of resonators, pointing towards the importance of surface dissipation. The temperature evolution is accurately fitted by two-level systems models, showing that nanomechanical dissipation in gallium arsenide resonators directly connects to their microscopic properties...
June 1, 2018: Physical Review Letters
Yury V Tomilov, Roman A Novikov, Denis D Borisov, Anna V Tarasova, Yaroslav V Tkachev
A new strategy for the three-component addition of halide anions and acetylenes to donor-acceptor cyclopropanes (DAC) has been suggested. This process is promoted by gallium(III) salts and based on the 1,2-zwitterionic type of DAC reactivity, and occurs with high E-selectivity. This reaction opens up a new group of processes involving DAC and is a new chapter in their chemistry. The reaction readily occurs for a broad range of substrates and is tolerant to various functional groups. This methodology makes it possible to assemble highly functionalized vinyl halides that are very convenient building blocks in organic synthesis...
June 13, 2018: Angewandte Chemie
Ellen Cesewski, Alexander P Haring, Yuxin Tong, Manjot Singh, Rajan Thakur, Sahil Laheri, Kaitlin A Read, Michael D Powell, Kenneth J Oestreich, Blake N Johnson
Three-dimensional (3D) printing now enables the fabrication of 3D structural electronics and microfluidics. Further, conventional subtractive manufacturing processes for microelectromechanical systems (MEMS) relatively limit device structure to two dimensions and require post-processing steps for interface with microfluidics. Thus, the objective of this work is to create an additive manufacturing approach for fabrication of 3D microfluidic-based MEMS devices that enables 3D configurations of electromechanical systems and simultaneous integration of microfluidics...
June 13, 2018: Lab on a Chip
Amine El Kacimi, Emmanuelle Pauliac-Vaujour, Olivier Delléa, Joël Eymery
We report an example of the realization of a flexible capacitive piezoelectric sensor based on the assembly of horizontal c&macr;-polar long Gallium nitride (GaN) wires grown by metal organic vapour phase epitaxy (MOVPE) with the Boostream&reg; technique spreading wires on a moving liquid before their transfer on large areas. The measured signal (<0.6 V) obtained by a punctual compression/release of the device shows a large variability attributed to the dimensions of the wires and their in-plane orientations...
June 12, 2018: Nanomaterials
Bhupendra Kumar Sharma, Anna Stoesser, Sandeep Kumar Mondal, Suresh K Garlapati, Mohammed H Fawey, Venkata Sai Kiran Chakravadhanula, Robert Kruk, Horst Hahn, Subho Dasgupta
Oxide semiconductors typically show superior device performance compared to amorphous silicon or organic counterparts, especially, when they are physical vapor deposited. However, it is not easy to reproduce identical device characteristics when the oxide field-effect transistors (FETs) are solution-processed/ printed; the level of complexity further intensifies with the need to print the passive elements as well. Here, we developed a protocol for designing the most electronically compatible electrode/ channel interface based on the judicious material selection...
June 12, 2018: ACS Applied Materials & Interfaces
Patrick J Snyder, Dennis R LaJeunesse, Pramod Reddy, Ronny Kirste, Ramon Collazo, Albena Ivanisevic
Baker's yeast, S. cerevisiae, is a model organism that is used in synthetic biology. The work demonstrates how GaN nanostructured thin films can encode physiological responses in S. cerevisiae yeast. The Ga-polar, n-type, GaN thin films are characterized via Photocurrent Measurements, Atomic Force Microscopy and Kelvin Probe Force Microscopy. UV light is used to induce persistent photoconductivity that results in charge accumulation on the surface. The morphological, chemical and electronic properties of the nanostructured films are utilized to activate the cell wall integrity pathway and alter the amount of chitin produced by the yeast...
June 11, 2018: Nanoscale
I R Karaca, G Ergun, D N Ozturk
Purpose: The purpose of this study was to investigate the effects of biostimulation lasers and ozone therapy on osseointegration of immediately loaded implants. Materials and Methods: A total number of 100 implants (DTI Implant Systems) were applied to 25 patients evenly. Temporary crowns were applied to each patient on the same session as the surgery. Implants were divided into four treatment groups (Group 1: low-level laser therapy (LLLT) group, Group 2: ozone therapy group, Group 3: different protocol of ozone therapy group, and Group 4: control group) each with 25 implants...
June 2018: Nigerian Journal of Clinical Practice
Sergio Catalán Gómez, Andres Redondo-Cubero, Francisco Javier Palomares Simon, Luis Vazquez Burgos, Emilio Nogales, Flavio Nucciarelli, Bianchi Mendez, Nuria Gordillo, Jose Luis Pau
Core-shell gallium nanoparticles (Ga NPs) have recently been proposed as an ultraviolet plasmonic material for different applications but only at room temperature. Here, the thermal stability as a function of the size of the NPs is reported over a wide range of temperatures. We analyse the chemical and structural properties of the oxide shell by x-ray photoelectron spectroscopy and atomic force microscopy. We demonstrate the inverse dependence of the shell breaking temperature with the size of the NPs. Spectroscopic ellipsometry is used for tracking the rupture and its mechanism is systematically investigated by scanning electron microscopy, grazing incidence x-ray diffraction and cathodoluminescence...
June 11, 2018: Nanotechnology
Jyotsna Bhatt, Archana Mukherjee, Ajit Shinto, Kamaleshwaran Koramadai Karuppusamy, Aruna Korde, Mukesh Kumar, Haladhar Dev Sarma, Krishnamohan Repaka, Ashutosh Dash
INTRODUCTION: Gallium-68 based infection imaging agents are in demand to detect infection foci with high spatial resolution and sensitivity. In this study, Ubiquicidin derived octapeptide, UBI (31-38) conjugated with macrocyclic chelator NOTA was radiolabeled with 68 Ga to develop infection imaging agent. METHODS: Circular dichroism (CD) spectroscopy was performed to study conformational changes in UBI (31-38) and its NOTA conjugate in a "membrane like environment"...
May 4, 2018: Nuclear Medicine and Biology
Adrienn Vágner, Attila Forgács, Ernő Brücher, Imre Tóth, Alessandro Maiocchi, Alexander Wurzer, Hans-Jürgen Wester, Johannes Notni, Zsolt Baranyai
In order to rationalize the influence of FeIII contamination on labeling with the 68 Ga eluted from 68 Ge/68 Ga- g enerator, a detailed investigation was carried out on the equilibrium properties, formation and dissociation kinetics of GaIII - and FeIII -complexes of 1,4,7-triazacyclononane-1,4,7-tris(methylene[2-carboxyethylphosphinic acid]) (H6 TRAP). The stability and protonation constants of the [Fe(TRAP)]3- complex were determined by pH-potentiometry and spectrophotometry by following the competition reaction between the TRAP ligand and benzhydroxamic acid (0...
2018: Frontiers in Chemistry
Jeffy Ann Jose, Sanju Somaiah, Sunil Muddaiah, Balakrishna Shetty, Goutham Reddy, S Roopa
Background and Objectives: Orthodontic forces are known to produce mechanical damage and inflammatory mediators such as prostaglandins (PGs) and interleukin (IL)-1, in the periodontium and dental pulp. Low-level laser therapy (LLLT) is a stimulator of the on-going biological process in tissue and found to be effective in modulating cell activity, which is involved in orthodontic tooth movement. Here, a humble effort has been made to study two such cytokines, namely IL-1 β and PG E2 (PGE2) which are partially responsible for bone turnover...
April 2018: Contemporary Clinical Dentistry
Saran Arumughan, Sanju Somaiah, Sunil Muddaiah, Balakrishna Shetty, Goutham Reddy, S Roopa
Background and Objectives: A major concern of orthodontic patients is treatment time. Reducing the treatment time requires increasing the rate of orthodontic tooth movement. Research has proved that bone resorption is the rate-limiting step in tooth movement. Therefore, any procedure that potentiates osteoclastic activity is capable of increasing the rate of orthodontic tooth movement. Low-level laser has been indicated to have the capability to facilitate the differentiation of the osteoclastic and osteoblastic cells, which are responsible for the bone remodeling process...
April 2018: Contemporary Clinical Dentistry
Jianping Ao, Rui Fu, Ming-Jer Jeng, Jinlian Bi, Liyong Yao, Shoushuai Gao, Guozhong Sun, Qing He, Zhiqiang Zhou, Yun Sun, Liann-Be Chang
Zinc oxide films that are prepared by radio frequency (RF) sputtering are widely used as window layers in copper indium gallium diselenide (CIGS) solar cells. To reduce their production cost, the electrodeposition method for preparing Cl-doped zinc oxide (ZnO:Cl), rather than sputtering, was studied. The electrodeposition parameters of injected current density and the pH of the electrolyte solution were studied. A moderate current density was used to yield high quality zinc oxides. The pH of the electrolyte greatly affected the formation of ZnO films...
June 5, 2018: Materials
Kristen A Wangerin, Lucia Baratto, Mohammad Mehdi Khalighi, Thomas A Hope, Praveen K Gulaka, Timothy W Deller, Andrei H Iagaru
OBJECTIVE: Gallium-68-labeled radiopharmaceuticals pose a challenge for scatter estimation because their targeted nature can produce high contrast in these regions of the kidneys and bladder. Even small errors in the scatter estimate can result in washout artifacts. Administration of diuretics can reduce these artifacts, but they may result in adverse events. Here, we investigated the ability of algorithmic modifications to mitigate washout artifacts and eliminate the need for diuretics or other interventions...
June 6, 2018: AJR. American Journal of Roentgenology
Benchaporn Lertanantawong, James D Riches, Anthony Peter O'Mullane
Gallium oxyhydroxide (GaOOH) is a wide band gap semiconductor of interest for a variety of applications in electronics and catalysis where the synthesis of the crystalline form is usually achieved via hydrothermal routes. Here we synthesise GaOOH via the electrochemical oxidation of gallium based liquid metals in solutions of 0.1 M NaNO3 electrolyte with pH adjusted over the range of 7 to 8.4 with NaOH. This electrochemical approach employed under ambient conditions results in the formation of crystalline oblong shaped α-GaOOH nanoparticles from both liquid gallium and liquid galinstan which is a eutectic based on Ga, In and Sn...
June 5, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Anja Braune, Martin Scharffenberg, Anne Naumann, Thomas Bluth, Marcelo Gama de Abreu, Jörg Kotzerke
AIM: We compared 68 Gallium (68 Ga)- and fluorescence-labeled microspheres for measurement of pulmonary perfusion distribution in anesthetized pigs without lung injury. METHODS: In two mechanically ventilated pigs, the distribution of pulmonary perfusion was marked in vivo with 68 Ga- and fluorescence-labeled microspheres in supine and prone position. After each injection, the distribution of 68 Ga-labeled microspheres was measured in vivo with positron emission tomography/ computed tomography (PET/CT) in the position in which microspheres were injected and vice versa...
June 2018: Nuklearmedizin. Nuclear Medicine
Mian L Ooi, Katharina Richter, Amanda J Drilling, Nicky Thomas, Clive A Prestidge, Craig James, Stephen Moratti, Sarah Vreugde, Alkis J Psaltis, Peter-John Wormald
Objectives: Increasing antimicrobial resistance has presented new challenges to the treatment of recalcitrant chronic rhinosinusitis fuelling a continuous search for novel antibiofilm agents. This study aimed to assess the safety and efficacy of Chitogel (Chitogel®, Wellington New Zealand) combined with novel antibiofilm agents Deferiprone and Gallium Protoporphyrin (CG-DG) as a topical treatment against S. aureus biofilms in vivo . Methods: To assess safety, 8 sheep were divided into two groups of 7 day treatments ( n = 8 sinuses per treatment); (1) Chitogel (CG) with twice daily saline flush, and (2) CG-DG gel with twice daily saline flush...
2018: Frontiers in Microbiology
Xinyu Liu, Xinhua Wang, Yange Zhang, Ke Wei, Yingkui Zheng, Xuanwu Kang, Haojie Jiang, Junfeng Li, Wenwu Wang, Xuebang Wu, Xian Ping Wang, Sen Huang
Constant-capacitance deep-level transient Fourier spectroscopy is utilized to characterize the interface between a GaN epitaxial layer and a SiNx passivation layer grown by low-pressure chemical vapor deposition (LPCVD). A near-conduction band (NCB) state ELP (EC-ET = 60 meV) featuring a very small capture cross section of 1.5×10-20 cm-2 was detected at 70 K at the LPCVD-SiNx/GaN interface. A partially crystallized Si2N2O thin layer was detected at the interface by high-resolution transmission electron microscopy...
June 4, 2018: ACS Applied Materials & Interfaces
Kay M Westenfelder, Beatrice Lentes, Julia Rackerseder, Nassir Navab, Jürgen E Gschwend, Matthias Eiber, Tobias Maurer
No abstract text is available yet for this article.
May 29, 2018: Clinical Genitourinary Cancer
P T Bhattacharya, K Patil, M V Guledgud
No abstract text is available yet for this article.
May 29, 2018: Actas Dermo-sifiliográficas
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