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https://www.readbyqxmd.com/read/28735464/radiation-dose-reduction-in-thoracic-and-lumbar-spine-instrumentation-using-navigation-based-on-an-intraoperative-cone-beam-ct-imaging-system-a-prospective-randomized-clinical-trial
#1
Nathalie Pireau, Virginie Cordemans, Xavier Banse, Nadia Irda, Sébastien Lichtherte, Ludovic Kaminski
PURPOSE: Spine surgery still remains a challenge for every spine surgeon, aware of the potential serious outcomes of misplaced instrumentation. Though many studies have highlighted that using intraoperative cone beam CT imaging and navigation systems provides higher accuracy than conventional freehand methods for placement of pedicle screws in spine surgery, few studies are concerned about how to reduce radiation exposure for patients with the use of such technology. One of the main focuses of this study is based on the ALARA principle (as low as reasonably achievable)...
July 22, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28729669/active-ktao3-hybrid-terahertz-metamaterial
#2
Liang Wu, Jinglong Liu, Hui Li, Chunfeng Ding, Ningning Xu, Xiaolei Zhao, Zongcheng Xu, Quan Sheng, Jianquan Yao, Jining Li, Xin Ding, Weili Zhang
The dielectric properties of an active KTaO3 hybrid metamaterial structure and its tunability under external electric fields are investigated at room temperature by means of terahertz time-domain spectroscopy. Application of the electric field leads to an appreciable tuning of the dielectric loss, which is up to 17%. Meanwhile, the refractive index also changes appreciably. These findings are attributed to the internal space charge field in the crystal caused by the excited free carriers.
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28721817/improvement-of-thermosensitive-liposome-stability-by-cerasome-forming-lipid-with-si-o-si-network-structure
#3
Qin Su, Ximing Pu, He Bai, Xianchun Chen, Xiaoming Liao, Zhongbing Huang, Guangfu Yin
BACKGROUND: Liposomes have been widely used in the gene transfection and the drug delivery systems due to their excellent biocompatibility and encapsulation ability, especially, the ability to deliver the gene/drug into the cells via the membrane fusion. Thermosensitive liposoems have been proven to be a precise and effective method for cancer treatment in many preclinical studies. But the imperfect crystalline arrangement between grains occurred, resulting in planar defects at the boundaries of membranes, compromising the stability of thermosensitive liposomes...
July 19, 2017: Current Drug Delivery
https://www.readbyqxmd.com/read/28715093/photostriction-of-ch3-nh3-pbbr3-perovskite-crystals
#4
Tzu-Chiao Wei, Hsin-Ping Wang, Ting-You Li, Chun-Ho Lin, Ying-Hui Hsieh, Ying-Hao Chu, Jr-Hau He
Organic-inorganic hybrid perovskite materials exhibit a variety of physical properties. Pronounced coupling between phonon, organic cations, and the inorganic framework suggest that these materials exhibit strong light-matter interactions. The photoinduced strain of CH3 NH3 PbBr3 is investigated using high-resolution and contactless in situ Raman spectroscopy. Under illumination, the material exhibits large blue shifts in its Raman spectra that indicate significant structural deformations (i.e., photostriction)...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28714985/electrical-pumping-and-tuning-of-exciton-polaritons-in-carbon-nanotube-microcavities
#5
Arko Graf, Martin Held, Yuriy Zakharko, Laura Tropf, Malte C Gather, Jana Zaumseil
Exciton-polaritons are hybrid light-matter particles that form upon strong coupling of an excitonic transition to a cavity mode. As bosons, polaritons can form condensates with coherent laser-like emission. For organic materials, optically pumped condensation was achieved at room temperature but electrically pumped condensation remains elusive due to insufficient polariton densities. Here we combine the outstanding optical and electronic properties of purified, solution-processed semiconducting (6,5) single-walled carbon nanotubes (SWCNTs) in a microcavity-integrated light-emitting field-effect transistor to realize efficient electrical pumping of exciton-polaritons at room temperature with high current densities (>10 kA cm(-2)) and tunability in the near-infrared (1,060 nm to 1,530 nm)...
July 17, 2017: Nature Materials
https://www.readbyqxmd.com/read/28701729/bias-in-recent-mirbase-annotations-potentially-associated-with-rna-quality-issues
#6
Nicole Ludwig, Meike Becker, Timo Schumann, Timo Speer, Tobias Fehlmann, Andreas Keller, Eckart Meese
Although microRNAs are supposed to be stable in-vivo, degradation processes potentially blur our knowledge on the small oligonucleotides. We set to quantify the effect of degradation on microRNAs in mouse to identify causes for distorted microRNAs patterns. In liver, we found 298, 99 and 8 microRNAs whose expression significantly correlated to RNA integrity, storage time at room temperature and storage time at 4 °C, respectively. Expression levels of 226 microRNAs significantly differed between liver samples with high RNA integrity compared to liver samples with low RNA integrity by more than two-fold...
July 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28700740/navigation-accuracy-after-automatic-and-hybrid-surface-registration-in-sinus-and-skull-base-surgery
#7
Tanja Daniela Grauvogel, Paul Engelskirchen, Wiebke Semper-Hogg, Juergen Grauvogel, Roland Laszig
OBJECTIVE: Computer-aided-surgery in ENT surgery is mainly used for sinus surgery but navigation accuracy still reaches its limits for skull base procedures. Knowledge of navigation accuracy in distinct anatomical regions is therefore mandatory. This study examined whether navigation accuracy can be improved in specific anatomical localizations by using hybrid registration technique. STUDY DESIGN: Experimental phantom study. SETTING: Operating room...
2017: PloS One
https://www.readbyqxmd.com/read/28700221/transuranic-hybrid-materials-crystallographic-and-computational-metrics-of-supramolecular-assembly
#8
Robert G Surbella, Lucas Colucci Ducati, Kristi L Pellegrini, Bruce K McNamara, Jochen Autschbach, Jon Michael Schwantes, Christopher L Cahill
A family of twelve supramolecular [AnO2Cl4](2-) (An = U, Np, Pu) containing compounds assembled via hydrogen and halogen bonds donated by substituted 4-X-pyridinium cations, X = H, Cl, Br, I is reported. These materials were prepared from a robust room-temperature synthesis wherein crystallization of unhydrolyzed and valence pure [An(VI)O2Cl4](2-) (An = U, Np, Pu) tectons are the norm. We present a hierarchy of assembly criteria based on crystallographic observations, and subsequently quantify the strengths of the non-covalent interactions using Kohn-Sham density functional calculations...
July 12, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28696304/bioinspired-supramolecular-fibers-drawn-from-a-multiphase-self-assembled-hydrogel
#9
Yuchao Wu, Darshil U Shah, Chenyan Liu, Ziyi Yu, Ji Liu, Xiaohe Ren, Matthew J Rowland, Chris Abell, Michael H Ramage, Oren A Scherman
Inspired by biological systems, we report a supramolecular polymer-colloidal hydrogel (SPCH) composed of 98 wt % water that can be readily drawn into uniform ([Formula: see text]6-[Formula: see text]m thick) "supramolecular fibers" at room temperature. Functionalized polymer-grafted silica nanoparticles, a semicrystalline hydroxyethyl cellulose derivative, and cucurbit[8]uril undergo aqueous self-assembly at multiple length scales to form the SPCH facilitated by host-guest interactions at the molecular level and nanofibril formation at colloidal-length scale...
July 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28692965/3d-reconstruction-in-the-presence-of-glass-and-mirrors-by-acoustic-and-visual-fusion
#10
Yu Zhang, Mao Ye, Dinesh Manocha, Ruigang Yang
We present a practical and inexpensive method to reconstruct 3D scenes that include transparent and mirror objects. Our work is motivated by the need for automatically generating 3D models of interior scenes, which commonly include glass. These large structures are often invisible to cameras. Existing 3D reconstruction methods for transparent objects are usually not applicable in such a room-sized reconstruction setting. Our simple hardware setup augments a regular depth camera with a single ultrasonic sensor, which is able to measure the distance to any object, including transparent surfaces...
July 6, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28678481/structural-study-of-a-doubly-ordered-perovskite-family-nalncowo6-ln-y-la-pr-nd-sm-eu-gd-tb-dy-ho-er-yb-hybrid-improper-ferroelectricity-in-nine-new-members
#11
Peng Zuo, Claire V Colin, Holger Klein, Pierre Bordet, Emmanuelle Suard, Erik Elkaim, Céline Darie
The compounds of the doubly ordered perovskite family NaLnCoWO6 (Ln = Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Yb) were synthesized by solid-state reaction, nine of which (Ln = Y, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Yb) are new phases prepared under high-temperature and high-pressure conditions. Their structural properties were investigated at room temperature by synchrotron X-ray powder diffraction and neutron powder diffraction. All of them crystallize in monoclinic structures, especially the nine new compounds have the polar space group P21 symmetry, as confirmed by second harmonic generation measurements...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28671838/developing-a-fluorescent-toolbox-to-shed-light-on-the-mysteries-of-rna
#12
Seth C Alexander, Neal K Devaraj
Technologies that detect and image RNA have illuminated the complex roles played by RNA, redefining the traditional and superficial role first outlined by the central dogma of biology. Because there is such a wide diversity of RNA structure arising from an assortment of functions within biology, a toolbox of approaches have emerged for investigation of this important class of biomolecules. These methods are necessary to detect and elucidate the localization and dynamics of specific RNAs and in doing so unlock our understanding of how RNA dysregulation leads to disease...
July 14, 2017: Biochemistry
https://www.readbyqxmd.com/read/28662806/temporal-trends-in-transcatheter-aortic%C3%A2-valve-replacement-in-france-france-2-to-france-tavi
#13
Vincent Auffret, Thierry Lefevre, Eric Van Belle, Hélène Eltchaninoff, Bernard Iung, René Koning, Pascal Motreff, Pascal Leprince, Jean Philippe Verhoye, Thibaut Manigold, Geraud Souteyrand, Dominique Boulmier, Patrick Joly, Frédéric Pinaud, Dominique Himbert, Jean Philippe Collet, Gilles Rioufol, Said Ghostine, Olivier Bar, Alain Dibie, Didier Champagnac, Lionel Leroux, Frédéric Collet, Emmanuel Teiger, Olivier Darremont, Thierry Folliguet, Florence Leclercq, Thibault Lhermusier, Patrick Olhmann, Bruno Huret, Luc Lorgis, Laurent Drogoul, Bernard Bertrand, Christian Spaulding, Laurent Quilliet, Thomas Cuisset, Maxence Delomez, Farzin Beygui, Jean-Philippe Claudel, Alain Hepp, Arnaud Jegou, Antoine Gommeaux, Anfani Mirode, Luc Christiaens, Charles Christophe, Claude Cassat, Damien Metz, Lionel Mangin, Karl Isaaz, Laurent Jacquemin, Philippe Guyon, Christophe Pouillot, Serge Makowski, Vincent Bataille, Josep Rodés-Cabau, Martine Gilard, Hervé Le Breton
BACKGROUND: Transcatheter aortic valve replacement (TAVR) is standard therapy for patients with severe aortic stenosis who are at high surgical risk. However, national data regarding procedural characteristics and clinical outcomes over time are limited. OBJECTIVES: The aim of this study was to assess nationwide performance trends and clinical outcomes of TAVR during a 6-year period. METHODS: TAVRs performed in 48 centers across France between January 2013 and December 2015 were prospectively included in the FRANCE TAVI (French Transcatheter Aortic Valve Implantation) registry...
July 4, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28662474/polypyrrole-decorated-bioi-nanosheets-efficient-photocatalytic-activity-for-treating-diverse-contaminants-and-the-critical-role-of-bifunctional-polypyrrole
#14
Jiaju Xu, Yingmo Hu, Chao Zeng, Yihe Zhang, Hongwei Huang
A conducting polymer polypyrrole (Ppy) was first employed to decorate BiOI for fabricating an organic-inorganic hybridized Ppy-BiOI nanocomposite photocatalyst via a facile in situ precipitation strategy at room temperature. The composite and intimate interface was confirmed by FTIR, XPS, SEM, HRTEM and TEM-mapping. In comparison with pristine BiOI, the Ppy-BiOI hybrids present significantly enhanced photocatalytic activity for degradation of Rhodamine B (RhB) under visible light (λ>420nm). Particularly, the Ppy-BiOI composite exhibits an universal photocatalytic performance for removing diverse industrial pollutants and antibiotics, including bisphenol A, 2,4-dichlorophenol, tetracycline hydrochloride and chlortetracycline hydrochloride...
June 19, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28661666/a-fine-tuned-metal-organic-framework-for-autonomous-indoor-moisture-control
#15
Rasha G AbdulHalim, Prashant M Bhatt, Youssef Belmabkhout, Aleksander Shkurenko, Karim Adil, Leonard J Barbour, Mohamed Eddaoudi
Conventional adsorbents, namely zeolites and silica gel, are often used to control humidity by adsorbing water; however, adsorbents capable of dual functionality of humidification and dehumidification, offering the desired control of the moisture level at room temperature, has yet to be explored. Here we report Y-shp-MOF-5, a hybrid microporous highly-connected Rare-Earth based metal-organic framework (MOF), with dual functionality for moisture control within the recommended range of relative humidity (45% to 65% RH) set by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE)...
June 29, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28661142/room-temperature-coherent-optical-phonon-in-2d-electronic-spectra-of-ch3nh3pbi3-perovskite-as-a-possible-cooling-bottleneck
#16
Daniele M Monahan, Liang Guo, Jia Lin, Letian Dou, Peidong Yang, Graham R Fleming
A hot phonon bottleneck may be responsible for slow hot carrier cooling in methylammonium lead iodide hybrid perovskite, creating the potential for more efficient hot carrier photovoltaics. In room-temperature 2D electronic spectra near the band edge, we observe amplitude oscillations due to a remarkably long lived 0.9 THz coherent phonon population at room temperature. This phonon (or set of phonons) is assigned to angular distortions of the Pb-I lattice, not coupled to cation rotations. The strong coupling between the electronic transition and the 0...
June 30, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28660267/ru-ii-metal-complex-immobilized-mesoporous-sba-15-hybrid-for-visible-light-induced-photooxidation-of-chlorophenolic-compounds-in-aqueous-medium
#17
Sumana Bhar, Rajakumar Ananthakrishnan
The work focuses on room-temperature photocatalytic degradation of phenolic compounds by Ru(ii)-complex immobilized mesoporous silica SBA-15 under visible light in an aqueous medium. The immobilization of [Ru(bpy)3]Cl2 complex on an SBA-15 surface is carried out, and the as-synthesized hybrid is characterized by X-ray Diffraction (XRD), Fourier Transformation IR Spectroscopy (FTIR), Diffuse Reflectance Spectroscopy (DRS), Brunauer-Emmett-Teller analysis (BET), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray analysis (EDX) and X-ray Photoelectron Spectroscopy (XPS)...
June 29, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28657706/crystalline-microporous-organosilicates-with-reversed-functionalities-of-organic-and-inorganic-components-for-room-temperature-gas-sensing
#18
Barbara Fabbri, Lucia Bonoldi, Vincenzo Guidi, Giuseppe Cruciani, Davide Casotti, Cesare Malagù, Giuseppe Bellussi, Roberto Millini, Luciano Montanari, Angela Carati, Caterina Rizzo, Erica Montanari, Stefano Zanardi
A deepened investigation on an innovative organic-inorganic hybrid material, referred to as ECS-14 (where ECS = Eni carbon silicates), revealed the possibility to use them as gas sensors. Indeed, among ECS phases, the crystalline state and the hexagonal microplateletlike morphology characteristic of ECS-14 seemed favorable properties to obtain continuous and uniform films. ECS-14 phase was used as functional material in screen-printable compositions and was thus deposited by drop coating for morphological, structural, thermal, and electrical characterizations...
July 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28657287/highly-conductive-solid-state-hybrid-electrolytes-operating-at-subzero-temperatures
#19
Taeyoung Kwon, Ilyoung Choi, Moon Jeong Park
We report a unique, highly conductive, dendrite-inhibited, solid-state polymer electrolyte platform that demonstrates excellent battery performance at subzero temperatures. A design based on functionalized inorganic nanoparticles with interconnected mesopores that contain surface nitrile groups is the key to this development. Solid-state hybrid polymer electrolytes based on succinonitrile (SN) electrolytes and porous nanoparticles were fabricated via a simple UV-curing process. SN electrolytes were effectively confined within the mesopores...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28654234/single-and-networked-zno-cnt-hybrid-tetrapods-for-selective-room-temperature-high-performance-ammonia-sensors
#20
Fabian Schütt, Vasile Postica, Rainer Adelung, Oleg Lupan
Highly porous hybrid materials with unique high-performance properties have attracted great interest from the scientific community, especially in the field of gas-sensing applications. In this work, tetrapodal-ZnO (ZnO-T) networks were functionalized with carbon nanotubes (CNTs) to form a highly efficient hybrid sensing material (ZnO-T-CNT) for ultrasensitive, selective, and rapid detection of ammonia (NH3) vapor at room temperature. By functionalizing the ZnO-T networks with 2.0 wt % of CNTs by a simple dripping procedure, an increase of 1 order of magnitude in response (from about 37 to 330) was obtained...
July 12, 2017: ACS Applied Materials & Interfaces
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