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https://www.readbyqxmd.com/read/28549283/the-use-of-foot-pumps-compression-devices-in-the-perioperative-management-of-ankle-fractures-systematic-review-of-the-current-literature
#1
REVIEW
Rachel Clarkson, Samer S S Mahmoud, Amar Rangan, William Eardley, Paul Baker
BACKGROUND: Ankle fractures account for 9% of all fractures seen in the United Kingdom. 15,000 of these fractures undergo operative fixation each year. Soft tissue swelling impacts on timing of fixation due to fears of infection and wound dehiscence. The use of arterio-venous foot pumps (AVFP) is increasing in this population although the evidence for their efficacy is unclear. In order to address this, we present an overview of the evidence for AVFP device use following ankle fracture...
March 10, 2017: Foot
https://www.readbyqxmd.com/read/28548553/human-amniotic-membrane-is-not-suitable-for-the-grafting-of-colon-lesions-and-prevention-of-adhesions-in-a-xenograft-rat-model
#2
Dimitri Barski, Holger Gerullis, Thorsten Ecke, Gabriella Varga, Mihaly Boros, Isabel Pintelon, Jean-Pierre Timmermans, Thomas Otto
INTRODUCTION: New biological materials are needed for specific applications in reconstructive bowel surgery and for the prevention of adhesion formation. Amniotic membranes (AMs) are assumed to have a number of unique characteristics that enhance the ingrowth of the surrounding tissue. The aim of the present study was to provide proof of these qualities in a xenograft model. MATERIALS AND METHODS: A multilayer human AM (HAM) was applied to repair defined colon wall defects in Sprague-Dawley rats (n = 18)...
May 1, 2017: Surgical Innovation
https://www.readbyqxmd.com/read/28547877/comparative-study-of-osteogenic-activity-of-multilayers-made-of-synthetic-and-biogenic-polyelectrolytes
#3
Deepak Guduru, Marcus S Niepel, Cristina Gonzalez-Garcia, Manuel Salmeron-Sanchez, Thomas Groth
Polyelectrolyte multilayer (PEM) coatings on biomaterials are applied to tailor adhesion, growth, and function of cells on biomedical implants. Here, biogenic and synthetic polyelectrolytes (PEL) are used for layer-by-layer assembly to study the osteogenic activity of PEM with human osteosarcoma MG-63 cells in a comparative manner. Formation of PEM is achieved with biogenic PEL fibrinogen (FBG) and poly-l-lysine (PLL) as well as biotinylated chondroitin sulfate (BCS) and avidin (AVI), while poly(allylamine hydrochloride) (PAH) and polystyrene sulfonate (PSS) represent a fully synthetic PEM used as a reference system here...
May 26, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28547766/local-release-of-vegf-using-fiber-mats-enables-effective-transplantation-of-layered-cardiomyocyte-sheets
#4
Kenichi Nagase, Yuhei Nagumo, Miri Kim, Hee-Jung Kim, Hei-Won Kyung, Hye-Jin Chung, Hidekazu Sekine, Tatsuya Shimizu, Hideko Kanazawa, Teruo Okano, Seung-Jin Lee, Masayuki Yamato
Cell sheet transplantation is a key tissue engineering technology. A vascular endothelial growth factor (VEGF)-releasing fiber mat is developed for the transplantation of multilayered cardiomyocyte sheets. Poly(vinyl alcohol) fiber mats bearing poly(lactic-co-glycolic acid) nanoparticles that incorporate VEGF are fabricated using electrospinning and electrospray methods. Six-layered cardiomyocyte sheets are transplanted with a VEGF-releasing mat into athymic rats. After two weeks, these sheets produce thicker cardiomyocyte layers compared with controls lacking a VEGF-releasing mat, and incorporate larger-diameter blood vessels containing erythrocytes...
May 26, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28546895/cvd-transfer-free-graphene-for-sensing-applications
#5
Chiara Schiattarella, Sten Vollebregt, Tiziana Polichetti, Brigida Alfano, Ettore Massera, Maria Lucia Miglietta, Girolamo Di Francia, Pasqualina Maria Sarro
The sp(2) carbon-based allotropes have been extensively exploited for the realization of gas sensors in the recent years because of their high conductivity and large specific surface area. A study on graphene that was synthetized by means of a novel transfer-free fabrication approach and is employed as sensing material is herein presented. Multilayer graphene was deposited by chemical vapour deposition (CVD) mediated by CMOS-compatible Mo. The utilized technique takes advantage of the absence of damage or contamination of the synthesized graphene, because there is no need for the transfer onto a substrate...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546005/fast-epithermal-and-thermal-photoneutron-dosimetry-in-air-and-in-tissue-equivalent-phantom-for-a-high-energy-x-ray-medical-accelerator
#6
Mehdi Sohrabi, Amir Hakimi
Photoneutron (PN) dosimetry in fast, epithermal and thermal energy ranges originated from the beam and albedo neutrons in high-energy X-ray medical accelerators is highly important from scientific, technical, radiation protection and medical physics points of view. Detailed dose equivalents in the fast, epithermal and thermal PN energy ranges in air up to 2m as well as at 35 positions from the central axis of 12 cross sections of the phantom at different depths were determined in 18MV X-ray beams of a Siemens ONCOR accelerator...
May 22, 2017: Zeitschrift Für Medizinische Physik
https://www.readbyqxmd.com/read/28545297/polymer-chromophore-catalyst-assembly-for-solar-fuel-generation
#7
Junlin Jiang, Benjamin D Sherman, Yan Zhao, Ru He, Ion Ghiviriga, Leila Alibabaei, Thomas J Meyer, Gyu Leem, Kirk S Schanze
A polystyrene-based chromophore-catalyst assembly (poly-2) has been synthesized and assembled at a mesoporous metal oxide photoanode. The assembly contains water oxidation catalyst centers based on [Ru(trpy)(phenq)(2+)] (Ru-Cat) and a [Ru(bpy)3](2+) derivative (Ru-C) as chromophores (trpy= 2,2';6,2″- terpyridine, phenq = 2-(quinol-8'-yl)-1,10-phenanthroline and bpy = 2,2'-bipyridine). The photophysical and electrochemical properties of the polychromophore-oxidation catalyst assembly were investigated in solution and at the surface of mesoporous metal oxide films...
May 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28545245/multimodal-bio-inspired-tactile-sensing-module-for-surface-characterization
#8
Thiago Eustaquio Alves de Oliveira, Ana-Maria Cretu, Emil M Petriu
Robots are expected to recognize the properties of objects in order to handle them safely and efficiently in a variety of applications, such as health and elder care, manufacturing, or high-risk environments. This paper explores the issue of surface characterization by monitoring the signals acquired by a novel bio-inspired tactile probe in contact with ridged surfaces. The tactile module comprises a nine Degree of Freedom Microelectromechanical Magnetic, Angular Rate, and Gravity system (9-DOF MEMS MARG) and a deep MEMS pressure sensor embedded in a compliant structure that mimics the function and the organization of mechanoreceptors in human skin as well as the hardness of the human skin...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28544963/fibronectin-based-multilayer-thin-films
#9
Adeline Gand, Maud Tabuteau, Coline Chat, Guy Ladam, Hassan Atmani, Paul R Van Tassel, Emmanuel Pauthe
Thin films mimicking the structure and composition of the extra-cellular matrix (ECM) are potentially attractive as biomaterials for cell contacting applications. Layer-by-layer (LbL) assembly of a biological polycation, poly(l-lysine) (PLL), and a common ECM protein, fibronectin (Fn), was employed here to construct nanoscale, ECM mimicking films. Incremental film thickness and interfacial charge magnitude are observed to diminish with layer number, resulting in sub-linear film growth scaling and saturation after about 10 layers...
May 10, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28541698/a-sensitive-phonon-based-probe-for-structure-identification-of-1t-mote2
#10
Lin Zhou, Shengxi Huang, Yuki Tatsumi, Lijun Wu, Huaihong Guo, Yaqing Bie, Keiji Ueno, Teng Yang, Yimei Zhu, Jing Kong, Riichiro Saito, Mildred S Dresselhaus
In this work, by combining transmission electron microscopy and polarized Raman spectroscopy for the 1T' MoTe2 flakes with different thicknesses, we found that the polarization dependence of Raman intensity is given as a function of excitation laser wavelength, phonon symmetry and phonon frequency, but has weak dependence on the flake thickness from few-layer to multilayer. In addition, the frequency of Raman peaks and the relative Raman intensity are sensitive to flake thickness, which manifests Raman spectroscopy as an effective probe for thickness of 1T' MoTe2...
May 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28541681/platelet-microcapsule-hybrids-leverage-contractile-force-for-targeted-delivery-of-hemostatic-agents
#11
Caroline E Hansen, David R Myers, Wallace Hunter Baldwin, Yumiko Sakurai, Shannon L Meeks, L Andrew Lyon, Wilbur A Lam
We report a cell-mediated, targeted drug delivery system utilizing polyelectrolyte multilayer capsules that hybridize with the patient's own platelets upon intravenous administration. The hybridized platelets function as the sensor and actuator for targeted drug delivery and controlled release in our system. These capsules are biochemically and mechanically tuned to enable platelet adhesion and capsule rupture upon platelet activation and contraction, enabling the targeted and controlled "burst" release of an encapsulated biotherapeutic...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28541660/supra-nanoparticle-functional-assemblies-through-programmable-stacking
#12
Cheng Tian, Marco Aurelio L Cordeiro, Julien Lhermitte, Huolin L Xin, Lior Shani, Mingzhao Liu, Chunli Ma, Yosef Yeshurun, Donald DiMarzio, Oleg Gang
The quest for the by-design assembly of material and devices from nanoscale inorganic components is well recognized. Conventional self-assembly is often limited in its ability to control material morphology and structure simultaneously. Here, we report a general method of assembling nanoparticles in a linear "pillar" morphology with regulated internal configurations. Our approach is inspired by supramolecular systems, where intermolecular stacking guides the assembly process to form diverse linear morphologies...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28541364/magnetization-reversal-and-magnetic-interactions-in-anisotropic-nd-dy-fe-co-b-mgo-%C3%AE-fe-disks-and-multilayers
#13
Z M Dai, W Liu, X T Zhao, T T Wang, S K Li, Yongsheng Yu, X G Zhao, Z D Zhang
We report on a field induced domain evolutionary procedure in the anisotropic Nd-Dy-Fe-Co-B/MgO/Fe multilayers by using first-order-reversal-curves and magnetic force microscopy. Different reversal behaviors and domain sizes are found in well coupled and decoupled multilayers by changing the thickness of the spacer layer. The competition between dipolar magnetostatic energy and Zeeman energy is evaluated by in-field observation throughout nucleation and annihilation processes. In addition, lithography-patterned arrays of soft Fe disks onto a continuous Nd-Dy-Fe-Co-B hard-magnetic layer are designed...
May 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28540862/electronic-and-optical-properties-of-strained-graphene-and-other-strained-2d-materials-a-review
#14
Gerardo G Naumis, Salvador Barraza-Lopez, Maurice Oliva-Leyva, Humberto Terrones
This review presents the state of the art of strain and ripple-induced effects on the electronic and optical properties of graphene. It starts by providing the crystallographic description of mechanical deformations, as well as the diffraction pattern for different kinds of representative deformations fields. Then, the focus turns to the unique elastic properties of graphene, and to how strain is produced. Thereafter, various theoretical approaches used to study the electronic properties of strained graphene are examined, discussing the advantages of each...
May 25, 2017: Reports on Progress in Physics
https://www.readbyqxmd.com/read/28540725/a-bio-inspired-3d-multilayered-shape-memory-scaffold-with-a-hierarchically-changeable-micropatterned-surface-for-efficient-vascularization
#15
Dian Liu, Tao Xiang, Tao Gong, Tian Tian, Xian Liu, Shaobing Zhou
How to achieve three-dimensional (3D) cell alignment and subsequent prompt tissue regeneration remains a great challenge. Here, inspired by the interior 3D architecture of native arteries, we develop a new 3D multilayered shape memory vascular scaffold with a hierarchically changeable micropatterned surface for vascularization. The shape memory function renders the implantation of the scaffold safe and convenient via minimally invasive surgery. By co-culturing endothelial cells (ECs) and vascular smooth muscle cells (VSMCs) on the 3D multilayered structure, the inner monolayer, which has a square micropatterned surface, can promote EC adhesion and migration, resulting in rapid endothelialization; the outer multilayers, which have rectangular micropatterned surfaces, can induce a circumferential alignment of VSMCs...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28538196/self-assembly-of-gd-3-sds-hepes-complex-and-curcumin-entrapment-for-enhanced-stability-fluorescence-image-in-cellular-system
#16
Chonticha Sahub, Gamolwan Tumcharern, Prae Chirawatkul, Vithaya Ruangpornvisuti, Sanong Ekgasit, Supasorn Wanichweacharungruang, Thawatchai Tuntulani, Tanapat Palaga, Boosayarat Tomapatanaget
At present, strategies to disperse hydrophobic molecules in water without altering their chemical structures include conventional surfactant-based micellar and vesicular systems, encapsulation into water dispersible polymeric nanoparticles, and loading onto the surface of various metal nanoparticles. Here, we report a simple and low cost platform to incorporate hydrophobic molecules into a stable water dispersible nanostructure that can significantly increase the stability of the encapsulated materials. The platform is based on the incorporation of hydrophobic molecules into the self-assembled complex of gadolinium ion (Gd(3+)), sodium dodecyl sulfate (SDS), and 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) called GdSH...
May 13, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28537771/atmospheric-constraints-on-the-surface-uv-environment-of-mars-at-3-9%C3%A2-ga-relevant-to-prebiotic-chemistry
#17
Sukrit Ranjan, Robin Wordsworth, Dimitar D Sasselov
Recent findings suggest that Mars may have been a clement environment for the emergence of life and may even have compared favorably to Earth in this regard. These findings have revived interest in the hypothesis that prebiotically important molecules or even nascent life may have formed on Mars and been transferred to Earth. UV light plays a key role in prebiotic chemistry. Characterizing the early martian surface UV environment is key to understanding how Mars compares to Earth as a venue for prebiotic chemistry...
May 24, 2017: Astrobiology
https://www.readbyqxmd.com/read/28537592/programming-molecular-self-assembly-of-intrinsically-disordered-proteins-containing-sequences-of-low-complexity
#18
Joseph R Simon, Nick J Carroll, Michael Rubinstein, Ashutosh Chilkoti, Gabriel P López
Dynamic protein-rich intracellular structures that contain phase-separated intrinsically disordered proteins (IDPs) composed of sequences of low complexity (SLC) have been shown to serve a variety of important cellular functions, which include signalling, compartmentalization and stabilization. However, our understanding of these structures and our ability to synthesize models of them have been limited. We present design rules for IDPs possessing SLCs that phase separate into diverse assemblies within droplet microenvironments...
June 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28536220/exploring-inside-a-shaggy-aorta-using-non-obstructive-angioscopy
#19
Sei Komatsu, Satoru Takahashi, Yasuyuki Toyama, Kazuhisa Kodama
A shaggy aorta is reportedly related to atheromatous embolisation, which causes serious ischaemic damage to various organs. However, its characteristics are poorly understood. Non-obstructive angioscopy (NOA) has been developed to safely detect aortic plaques and injuries. A 70-year-old woman who was found to have a shaggy aorta on CT angiography underwent NOA for precise evaluation of vulnerable aortic plaques and injuries inside the aorta. Vulnerable aortic plaques included puff-like ruptures, chandelier-like ruptures and erosions seen throughout the aorta...
May 22, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28534912/prediction-on-the-light-assisted-exfoliation-of-multilayered-arsenene-by-the-photo-isomerization-of-azobenzene
#20
Jun Zhao, Chunyan Liu, Wanlin Guo, Jing Ma
The exfoliation of gray arsenic into single- or few-layered arsenene is a challenge of utmost importance. We propose here that the conformational change in the photo-isomerization of azobenzene-based photochromes might be used to promote the exfoliation of multilayered arsenene. Our density functional theory calculations show that the trans-to-cis conformational change can lead to an increase of the adjacent interlayer distance of arsenene from 6.59 Å to 11.07 Å. Starting from the transition state, the azobenzene molecule can be isomerized into the more stable trans form based on further ab initio molecular dynamics simulations...
May 23, 2017: Nanoscale
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