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https://www.readbyqxmd.com/read/29450937/adaptation-of-mineral-trioxide-aggregate-to-dentine-walls-compared-with-other-root-end-filling-materials-a-systematic-review
#1
REVIEW
Selen Küçükkaya Eren, Peter Parashos
This systematic review analysed the literature comparing marginal adaptation of mineral trioxide aggregate (MTA) with other filling materials in root-end cavities. The PubMed, Ovid, Web of Science, SCOPUS, and Cochrane library databases were searched using appropriate keywords related to root-end filling materials and adaptation. Of 38 articles assessed, 20 met the inclusion criteria. No in vivo study was identified. In 10 studies, MTA gave the best marginal adaptation results, but no significant differences were found between MTA and any of the tested filling materials in seven studies...
February 16, 2018: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
https://www.readbyqxmd.com/read/29449697/stereochemical-identification-of-glucans-by-oligothiophenes-enables-cellulose-anatomical-mapping-in-plant-tissues
#2
Ferdinand X Choong, Marcus Bäck, Anette Schulz, K Peter R Nilsson, Ulrica Edlund, Agneta Richter-Dahlfors
Efficient use of plant-derived materials requires enabling technologies for non-disruptive composition analysis. The ability to identify and spatially locate polysaccharides in native plant tissues is difficult but essential. Here, we develop an optical method for cellulose identification using the structure-responsive, heptameric oligothiophene h-FTAA as molecular fluorophore. Spectrophotometric analysis of h-FTAA interacting with closely related glucans revealed an exceptional specificity for β-linked glucans...
February 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29448342/heterogeneous-continuous-time-random-walks
#3
Denis S Grebenkov, Liubov Tupikina
We introduce a heterogeneous continuous-time random walk (HCTRW) model as a versatile analytical formalism for studying and modeling diffusion processes in heterogeneous structures, such as porous or disordered media, multiscale or crowded environments, weighted graphs or networks. We derive the exact form of the propagator and investigate the effects of spatiotemporal heterogeneities onto the diffusive dynamics via the spectral properties of the generalized transition matrix. In particular, we show how the distribution of first-passage times changes due to local and global heterogeneities of the medium...
January 2018: Physical Review. E
https://www.readbyqxmd.com/read/29448230/reversible-modulation-of-the-redox-activity-in-conducting-polymer-nanofilms-induced-by-hydrophobic-collapse-of-a-surface-grafted-polyelectrolyte
#4
Gonzalo E Fenoy, Juan M Giussi, Catalina von Bilderling, Eliana M Maza, Lía I Pietrasanta, Wolfgang Knoll, Waldemar A Marmisollé, Omar Azzaroni
We present the covalent modification of a Pani-like conducting polymer (polyaminobenzylamine, PABA) by grafting of a polyelectrolyte brush (poly [2-(methacryloyloxy)-ethyl-trimethylammonium chloride], PMETAC). As PABA has extra pendant amino moieties, the grafting procedure does not affect the backbone nitrogen atoms that are implicated in the electronic structure of the conducting polymers. Moreover, perchlorate anions interact very strongly with the quaternary ammonium pendant groups of PMETAC through ion pairing...
February 7, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29446621/oxidative-dehydrogenation-on-nanocarbon-insights-into-the-reaction-mechanism-and-kinetics-via-in-situ-experimental-methods
#5
Wei Qi, Pengqiang Yan, Dang Sheng Su
Sustainable and environmentally benign catalytic processes are vital for the future to supply the world population with clean energy and industrial products. The replacement of conventional metal or metal oxide catalysts with earth abundant and renewable nonmetallic materials has attracted considerable research interests in the field of catalysis and material science. The stable and efficient catalytic performance of nanocarbon materials was discovered at the end of last century, and these materials are considered as potential alternatives for conventional metal-based catalysts...
February 15, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29446521/co-assembly-of-polyoxometalates-and-zwitterionic-amphiphiles-into-supramolecular-hydrogels-from-crystalline-fibrillar-to-amorphous-micellar-networks
#6
Aoli Wu, Xinpei Gao, Panpan Sun, Fei Lu, Liqiang Zheng
Gelation mechanism is of utmost importance to the rational design of supramolecular hydrogelators. Although both kinetic and thermodynamic controlling self-assembly processes have been widely studied in hydrogels, the evolution relationship between crystalline and amorphous gel networks still remains ambiguous. Herein, a gelation transformation from kinetic to thermodynamic process was achieved by balancing the rigidity and flexibility of the inorganic-organic co-assemblies. And for the first time, the transition morphologies between crystalline and amorphous hydrogel networks were evidenced as ordered wormlike micelles...
February 15, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29446382/a-spin-orbital-entangled-quantum-liquid-on-a-honeycomb-lattice
#7
K Kitagawa, T Takayama, Y Matsumoto, A Kato, R Takano, Y Kishimoto, S Bette, R Dinnebier, G Jackeli, H Takagi
The honeycomb lattice is one of the simplest lattice structures. Electrons and spins on this simple lattice, however, often form exotic phases with non-trivial excitations. Massless Dirac fermions can emerge out of itinerant electrons, as demonstrated experimentally in graphene, and a topological quantum spin liquid with exotic quasiparticles can be realized in spin-1/2 magnets, as proposed theoretically in the Kitaev model. The quantum spin liquid is a long-sought exotic state of matter, in which interacting spins remain quantum-disordered without spontaneous symmetry breaking...
February 14, 2018: Nature
https://www.readbyqxmd.com/read/29445947/bone-graft-materials-for-posterolateral-fusion-made-simple-a-systematic-review
#8
REVIEW
Matthew T Morris, Sandip P Tarpada, Woojin Cho
BACKGROUND: Iliac crest has long been the gold standard for lumbar fusion, but concerns over donor site morbidity have led to a wide variety of bone graft substitutes. Despite prolific research, a general consensus is yet to be reached on bone graft materials that lead to optimal fusion. PURPOSE: The purpose of this review is to evaluate the current literature for bone graft material options that maximize fusion rate in posterolateral lumbar fusion surgery. DESIGN: Systematic Review...
February 14, 2018: European Spine Journal
https://www.readbyqxmd.com/read/29445780/actinide-based-mofs-a-middle-ground-in-solution-and-solid-state-structural-motifs
#9
Ekaterina A Dolgopolova, Allison M Rice, Natalia B Shustova
In this review, we highlight how recent advances in the field of actinide structural chemistry of metal-organic frameworks (MOFs) could be utilized towards investigations relative to efficient nuclear waste administration, driven by the interest towards development of novel actinide-containing architectures as well as concerns regarding environmental pollution and nuclear waste storage. We attempt to perform a comprehensive analysis of more than 100 crystal structures of the existing An (U,Th)-based MOFs to establish a correlation between structural density and wt% of actinide and bridge structural motifs common for natural minerals with ones typically observed in the solution chemistry of actinides...
February 15, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29445195/ultra-high-thermal-effusivity-materials-for-resonant-ambient-thermal-energy-harvesting
#10
Anton L Cottrill, Albert Tianxiang Liu, Yuichiro Kunai, Volodymyr B Koman, Amir Kaplan, Sayalee G Mahajan, Pingwei Liu, Aubrey R Toland, Michael S Strano
Materials science has made progress in maximizing or minimizing the thermal conductivity of materials; however, the thermal effusivity-related to the product of conductivity and capacity-has received limited attention, despite its importance in the coupling of thermal energy to the environment. Herein, we design materials that maximize the thermal effusivity by impregnating copper and nickel foams with conformal, chemical-vapor-deposited graphene and octadecane as a phase change material. These materials are ideal for ambient energy harvesting in the form of what we call thermal resonators to generate persistent electrical power from thermal fluctuations over large ranges of frequencies...
February 14, 2018: Nature Communications
https://www.readbyqxmd.com/read/29442706/human-adipose-derived-stem-cells-and-osteoblasts-interaction-with-fe-cr-nb-b-magnetic-nanoparticles
#11
Luminita Simion Labusca, Dumitru-Daniel Herea, Ecaterina Radu, Camelia Danceanu, Horia Chiriac, Nicoleta Lupu
The use of materials at nanoscale is currently of increasing interest for life sciences and medicine. Magnetic nanoparticles (MNPs) are under scrutiny for a large array of applications in nanomedicine as diagnostic and therapeutic tools. Proprietary Fe-Cr-Nb-B MNPs display heating properties that recommends them as potent agents for delivery of local hyperthermia for the treatment of solid tumours. Stem cell mediated delivery represents a safe and accurate modality to target remote or metastatic tumour sites...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29440869/exfoliation-syndrome-in-northern-nigeria
#12
Ugbede Idakwo, Olusola Olawoye, Benedictus Gk Ajayi, Robert Ritch
Purpose: To estimate the frequency of exfoliation syndrome (XFS) and its association with ocular diseases in Northern Nigeria. Materials and methods: Consecutive patients who presented to the outpatient department of ECWA Eye Hospital Kano from February 2015 to May 2015 were included in the study. Each patient had a complete ophthalmic examination. The anterior segment examination included tonometry, gonioscopy, and detailed slit-lamp examination to assess for the presence or absence of exfoliation material, inflammatory cells, and other abnormal findings...
2018: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29438327/carbon-based-nanomaterials-allotropes-a-glimpse-of-their-synthesis-properties-and-some-applications
#13
REVIEW
Salisu Nasir, Mohd Zobir Hussein, Zulkarnain Zainal, Nor Azah Yusof
Carbon in its single entity and various forms has been used in technology and human life for many centuries. Since prehistoric times, carbon-based materials such as graphite, charcoal and carbon black have been used as writing and drawing materials. In the past two and a half decades or so, conjugated carbon nanomaterials, especially carbon nanotubes, fullerenes, activated carbon and graphite have been used as energy materials due to their exclusive properties. Due to their outstanding chemical, mechanical, electrical and thermal properties, carbon nanostructures have recently found application in many diverse areas; including drug delivery, electronics, composite materials, sensors, field emission devices, energy storage and conversion, etc...
February 13, 2018: Materials
https://www.readbyqxmd.com/read/29437460/accelerating-science-with-generative-adversarial-networks-an-application-to-3d-particle-showers-in-multilayer-calorimeters
#14
Michela Paganini, Luke de Oliveira, Benjamin Nachman
Physicists at the Large Hadron Collider (LHC) rely on detailed simulations of particle collisions to build expectations of what experimental data may look like under different theoretical modeling assumptions. Petabytes of simulated data are needed to develop analysis techniques, though they are expensive to generate using existing algorithms and computing resources. The modeling of detectors and the precise description of particle cascades as they interact with the material in the calorimeter are the most computationally demanding steps in the simulation pipeline...
January 26, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29437435/optical-time-reversal-from-time-dependent-epsilon-near-zero-media
#15
Stefano Vezzoli, Vincenzo Bruno, Clayton DeVault, Thomas Roger, Vladimir M Shalaev, Alexandra Boltasseva, Marcello Ferrera, Matteo Clerici, Audrius Dubietis, Daniele Faccio
Materials with a spatially uniform but temporally varying optical response have applications ranging from magnetic field-free optical isolators to fundamental studies of quantum field theories. However, these effects typically become relevant only for time variations oscillating at optical frequencies, thus presenting a significant hurdle that severely limits the realization of such conditions. Here we present a thin-film material with a permittivity that pulsates (uniformly in space) at optical frequencies and realizes a time-reversing medium of the form originally proposed by Pendry [Science 322, 71 (2008)SCIEAS0036-807510...
January 26, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29437224/perception-and-measurement-of-food-texture-solid-foods
#16
K Nishinari, Y Fang
There is still a gap between instrumental measurement and sensory evaluation because of the complexity of food texture in spite of many efforts. In sensory evaluation, the terms describing the texture should be well understood by panelists, which poses a problem of establishing lexicons and training panelists. In the instrumental measurement, more efforts are required to understand the large deformation and fracture behaviour of foods. The texture profile analysis (TPA) proposed by Alina Szczesniak, Malcolm Bourne and Sherman has been applied to many foods, and was useful to develop the understanding of textures...
February 13, 2018: Journal of Texture Studies
https://www.readbyqxmd.com/read/29437054/the-effect-of-bearing-surface-on-risk-of-periprosthetic-joint-infection-in-total-hip-arthroplasty-a-systematic-review-and-meta-analysis
#17
REVIEW
A T Hexter, S M Hislop, G W Blunn, A D Liddle
AIMS: Periprosthetic joint infection (PJI) is a serious complication of total hip arthroplasty (THA). Different bearing surface materials have different surface properties and it has been suggested that the choice of bearing surface may influence the risk of PJI after THA. The objective of this meta-analysis was to compare the rate of PJI between metal-on-polyethylene (MoP), ceramic-on-polyethylene (CoP), and ceramic-on-ceramic (CoC) bearings. PATIENTS AND METHODS: Electronic databases (Medline, Embase, Cochrane library, Web of Science, and Cumulative Index of Nursing and Allied Health Literature) were searched for comparative randomized and observational studies that reported the incidence of PJI for different bearing surfaces...
February 2018: Bone & Joint Journal
https://www.readbyqxmd.com/read/29436800/comprendre-les-personnes-atteintes-de-la-maladie-de-steinert-pour-mieux-les-soigner
#18
Didier Lecordier, Emmanuelle Cartron, Ljiljana Jovic
INTRODUCTION: the lifestyles of people with myotonic dystrophy type 1 (DM1) are poorly understood and yet their consideration is essential for effective long-term care. The nursing care provided in the reference centers integrates the diversity clinic of this disease in interdisciplinary care, but it is more complicated from a relational point of view. The objective of this qualitative study was to understand the ways of living for a person with DM1, his body and the coping strategies developed...
February 2, 2018: Recherche en Soins Infirmiers
https://www.readbyqxmd.com/read/29435448/toward-a-tiered-model-to-share-clinical-trial-data-and-samples-in-precision-oncology
#19
Stefanie Broes, Denis Lacombe, Michiel Verlinden, Isabelle Huys
The recent revolution in science and technology applied to medical research has left in its wake a trial of biomedical data and human samples; however, its opportunities remain largely unfulfilled due to a number of legal, ethical, financial, strategic, and technical barriers. Precision oncology has been at the vanguard to leverage this potential of "Big data" and samples into meaningful solutions for patients, considering the need for new drug development approaches in this area (due to high costs, late-stage failures, and the molecular diversity of cancer)...
2018: Frontiers in Medicine
https://www.readbyqxmd.com/read/29435400/encapsulation-of-cadmium-selenide-nanocrystals-in-biocompatible-nanotubes-dft-calculations-x-ray-diffraction-investigations-and-confocal-fluorescence-imaging
#20
David G Calatayud, Haobo Ge, Navaratnarajah Kuganathan, Vincenzo Mirabello, Robert M J Jacobs, Nicholas H Rees, Craig T Stoppiello, Andrei N Khlobystov, Rex M Tyrrell, Enrico Da Como, Sofia I Pascu
The encapsulation of CdSe nanocrystals within single-walled carbon nanotube (SWNT) cavities of varying dimensions at elevated temperatures under strictly air-tight conditions is described for the first time. The structures of CdSe nanocrystals under confinement inside SWNTs was established in a comprehensive study, combining both experimental and DFT theoretical investigations. The calculated binding energies show that all considered polymorphs [(3:3), (4:4), and (4:2)] may be obtained experimentally. The most thermodynamically stable structure (3:3) is directly compared to the experimentally observed CdSe structures inside carbon nanotubes...
February 2018: ChemistryOpen
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