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Core Strength

Sung-Hoon Kim, Chan-Jin Park, Lee-Ra Cho, Yoon-Hyuk Huh
STATEMENT OF PROBLEM: Little information is available for the strength of bonding between zirconia and lithium disilicate as affected by surface pretreatment methods. PURPOSE: The purpose of this in vitro study was to investigate the shear bond strength (SBS) between zirconia core and lithium disilicate (LS2 ) veneered ceramic after surface pretreatments. MATERIAL AND METHODS: Fully sintered yttrium oxide partially stabilized tetragonal zirconia (Y-TZP) disk specimens were fabricated from zirconia ceramic materials...
March 15, 2018: Journal of Prosthetic Dentistry
Xun Liu, Shang-Qing Zhang, Xing Wei, Ting Yang, Ming-Li Chen, Jian-Hua Wang
A novel core-shell structure optical pH sensor is developed with upconversion nanoparticles (UCNPs) serving as the core and silica as the shell, followed by grafting bovineserumalbumin (BSA) as another shell via glutaraldehyde cross-linking. The obtained core-shell-shell structure is shortly termed as UCNPs@SiO2 @BSA, and its surface provides a platform for loading various pH sensitive dyes, which are alike "modules" to make it feasible for measuring pHs within different pH ranges by simply regulating the type of dyes...
March 6, 2018: Biosensors & Bioelectronics
Andrew T Fenley, Ramu Anandakrishnan, Yared H Kidane, Alexey V Onufriev
BACKGROUND: Controlled modulation of nucleosomal DNA accessibility via post-translational modifications (PTM) is a critical component to many cellular functions. Charge-altering PTMs in the globular histone core-including acetylation, phosphorylation, crotonylation, propionylation, butyrylation, formylation, and citrullination-can alter the strong electrostatic interactions between the oppositely charged nucleosomal DNA and the histone proteins and thus modulate accessibility of the nucleosomal DNA, affecting processes that depend on access to the genetic information, such as transcription...
March 16, 2018: Epigenetics & Chromatin
Krishnanand Mallayya, Marcos Rigol
We implement numerical linked cluster expansions (NLCEs) to study dynamics of lattice systems following quantum quenches, and focus on a hard-core boson model in one-dimensional lattices. We find that, in the nonintegrable regime and within the accessible times, local observables exhibit exponential relaxation. We determine the relaxation rate as one departs from the integrable point and show that it scales quadratically with the strength of the integrability breaking perturbation. We compare the NLCE results with those from exact diagonalization calculations on finite chains with periodic boundary conditions, and show that NLCEs are far more accurate...
February 16, 2018: Physical Review Letters
Andrew C Parrott
Many novel psychoactive substances (NPS) have entered the recreational drug scene in recent years, yet the problems they cause are similar to those found with established drugs. This article will debate the psychobiological effects of these newer and more traditional substances. It will show how they disrupt the same core psychobiological functions, so damaging well-being in similar ways. Every psychoactive drug causes mood states to fluctuate. Users feel better on-drug, then feel worse off-drug. The strength of these mood fluctuations is closely related to their addiction potential...
March 13, 2018: Brain Sciences
Paul G Harnik, Hafiz Maherali, Joshua H Miller, Paul S Manos
The geographic ranges of taxa change in response to environmental conditions. Yet whether rates of range movement (biotic velocities) are phylogenetically conserved is not well known. Phylogenetic conservatism of biotic velocities could reflect similarities among related lineages in climatic tolerances and dispersal-associated traits. We assess whether late Quaternary biotic velocities were phylogenetically conserved and whether they correlate with climatic tolerances and dispersal-associated traits. We used phylogenetic regression and nonparametric correlation to evaluate associations between biotic velocities, dispersal-associated traits, and climatic tolerances for 28 woody plant genera and subgenera in North America...
March 2018: Ecology and Evolution
Pengcheng Chen, Xuewen Shu
An optical fiber Fabry-Perot probe sensor for high-temperature measurement is proposed and demonstrated, which is fabricated by inducing a refractive-index-modified-dot (RIMD) in the fiber core near the end of a standard single mode fiber (SMF) using a femtosecond laser. The RIMD and the SMF end faces form a Fabry-Perot interferometer (FPI) with a high-quality interference fringe visibility (>20dB). As a high-temperature sensor, such an FPI exhibits a sensitivity of 13.9pm/°C and 18.6pm/°C in the range of 100-500°Cand 500-1000°C,respectively...
March 5, 2018: Optics Express
Ivan Koychev, John Francis William Deakin, Wael El-Deredy, Corinna Haenschel
BACKGROUND: Working memory (WM) deficits are a core feature of schizophrenia. Electrophysiological studies suggest that impaired early visual processing may contribute to impaired WM in the visual domain. Abnormal N-methyl-D-aspartate (NMDA) receptor function has been implicated both in WM and in early visual processing deficits in schizophrenia. We investigated whether ketamine, a noncompetitive NMDA antagonist, would replicate in healthy volunteers the WM performance and early visual processing abnormalities we and others have reported in patients with schizophrenia...
April 2017: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
Helena Verhelst, Catharine Vander Linden, Toon De Pauw, Guy Vingerhoets, Karen Caeyenberghs
Recent evidence has shown the presence of a "rich club" in the brain, which constitutes a core network of highly interconnected and spatially distributed brain regions, important for high-order cognitive processes. This study aimed to map the rich club organization in 17 young patients with moderate to severe TBI (15.71 ± 1.75 years) in the chronic stage of recovery and 17 age- and gender-matched controls. Probabilistic tractography was performed on diffusion weighted imaging data to construct the edges of the structural connectomes using number of streamlines as edge weight...
March 12, 2018: Human Brain Mapping
Scott M Goetz, Christina M Romagosa, Arthur G Appel, Craig Guyer, Mary T Mendonça
During geographic range expansion, populations of non-indigenous species at the invasion front may benefit from directing resources away from immune defense. To test this hypothesis, we investigated the strength of two innate immune components in populations of invasive Cuban Treefrogs (Osteopilus septentrionalis) in a long-colonized area (core region) and at the invasion front (leading-edge region). First, we compared the region-specific metabolic response of frogs injected with an endotoxin that induces systemic inflammation (lipopolysaccharide, LPS) to sham-injected control frogs pooled from both regions...
March 12, 2018: Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology
Colleen P Chin, YiXin Ren, Joan Berry, Stanley A Knott, Craig C McLauchlan, Lisa F Szczepura
Novel oxazine, oxazoline and carboxamide cluster complexes were prepared when different nucleophilic oxygen species reacted with nitriles coordinated to the Lewis acidic [Re6 Se8 ]2+ cluster core. Reaction of ICH2 CH2 O- (generated in situ) with [Re6 Se8 (PEt3 )5 (NCR)]A2 (1A2 (R = Me) and 2A2 (R = Ph) where A = BF4 - ), leads to the formation of [Re6 Se8 (PEt3 )5 (2-methyloxazoline)]2+ (32+ ) and [Re6 Se8 (PEt3 )5 (2-phenyloxazoline)]2+ (42+ ). Similarly, reaction of BrCH2 CH2 CH2 O- with the same nitrile complexes, 1A2 and 2A2 (where A = BF4 - or SbF6 - ) leads to the corresponding oxazine complexes, [Re6 Se8 (PEt3 )5 (2-methyloxazine)]2+ (52+ ) and [Re6 Se8 (PEt3 )5 (2-phenyloxazine)]2+ (62+ )...
March 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Verena Vogel, Ines Kollei, Theodora Duka, Jan Snagowski, Matthias Brand, Astrid Müller, Sabine Loeber
At present, there is a considerable lack of human studies that investigated the impact of conditioned cues on instrumental responding although these processes are considered as core mechanisms contributing to the development and maintenance of addictive behaviours. No studies are available that assessed these processes with regard to Internet gaming or Internet shopping applications. We thus developed a Pavlovian-to-instrumental transfer (PIT)-Paradigm implementing appetitive stimuli related to Internet gaming and Internet shopping applications and investigated whether an outcome-specific PIT-Effect is observed...
March 6, 2018: Behavioural Brain Research
M Gundogdu, L I Aladag
Objectives: The aim of the present study was to evaluate the effects of self-etch and self-adhesive resin cements on the shear bond strength of ceramic core materials bonded to dentin. Materials and Methods: Extracted, caries-free, human central maxillary incisor teeth were selected, and the vestibule surfaces were cut flat to obtain dentin surfaces. Ceramic core materials (IPS e.max Press and Prettau Zirconia) were luted to the dentin surfaces using three self-etch adhesive systems (Duo-Link, Panavia F 2...
March 2018: Nigerian Journal of Clinical Practice
Anna Bailey, Helen Ellis-Caird, Carla Croft
OBJECTIVE: To provide a model of resilience among women undergoing fertility treatments, who experience repeated unsuccessful conception attempts. BACKGROUND: Assisted reproductive treatment is emotionally and physically challenging. Women undergoing such treatments report experiencing high levels of anxiety and depression. There continues to be a lack of understanding of the process women go through to adapt to the challenges associated with fertility treatment, in order to continue to pursue their goal of pregnancy...
September 2017: Journal of Reproductive and Infant Psychology
Kwang-Hyun Song, Yong-Woon Im, Jung-Hwan Lee, Jonghyuk Lee, Hae-Hyoung Lee
This study aimed to evaluate the mold-enclosed shear bond strength (ME-SBS) of zirconia to veneering porcelain with different surface treatments. Colored or uncolored zirconia coupons were either highly polished or airborne-particle abraded. The specimens were divided into groups with/without application of liner. Veneering porcelain was fired into an alumina ring mold on the zirconia coupons. The assembled specimens were subjected to the ME-SBS test. The mean ME-SBS for groups ranged from 7-10 MPa with no significant difference (p>0...
March 7, 2018: Dental Materials Journal
Sybil Obuobi, Zhi Xiang Voo, Mei W Low, Bertrand Czarny, Vanitha Selvarajan, Nor L Ibrahim, Yi Yan Yang, Pui Lai Rachel Ee
While physically crosslinked polycarbonate hydrogels are effective drug delivery platforms, their hydrophobic nature and lack of side chain functionality or affinity ligands for controlled release of hydrophilic drugs underscore the importance of their chemical compositions. This study evaluates an array of anionic hydrogel systems of phenylboronic acid functionalized triblock copolymers prepared via reversible physical interactions. Variation of key chemical functionalities while maintaining similar core structural features demonstrates the influence of the substitution position and protection of the boronic acid functionality on gel viscoelasticity and mechanical strength at physiological pH...
March 6, 2018: Advanced Healthcare Materials
Anne Grethen, David Glueck, Sandro Keller
Styrene/maleic acid (SMA) and related copolymers are attracting great interest because they solubilise membrane proteins and lipids to form polymer-encapsulated nanodiscs. These nanodiscs retain a lipid-bilayer core surrounded by a polymer rim and can harbour a membrane protein or a membrane-protein complex. SMA exists in different styrene/maleic acid molar ratios, which results in differences in hydrophobicity and solubilisation properties. We have recently demonstrated fast collisional lipid transfer among nanodiscs encapsulated by the relatively hydrophobic copolymer SMA(3:1)...
March 5, 2018: Journal of Membrane Biology
Markku Paanalahti, Guna Berzina, Åsa Lundgren-Nilsson, Toni Arndt, Katharina S Sunnerhagen
PURPOSE: To examine if the International Classification of Functioning (ICF) core set for stoke contains problems that are relevant for the persons living with stroke as expressed in the Stroke Impact Scale (SIS). METHODS: Cross-sectional study of 242 persons with previous stroke. The agreement between the perceived problems in the SIS items and problems in the categories of Comprehensive ICF Core Set for stroke were analyzed using percent of agreement and Kappa statistic...
March 5, 2018: Disability and Rehabilitation
Zhaowen Huang, Yang Cao, Jinfeng Nie, Hao Zhou, Yusheng Li
Gradient structured materials possess good combinations of strength and ductility, rendering the materials attractive in industrial applications. In this research, a surface nanocrystallization (SNC) technique, rotationally accelerated shot peening (RASP), was employed to produce a gradient nanostructured pure Ti with a deformation layer that had a thickness of 2000 μm, which is thicker than those processed by conventional SNC techniques. It is possible to fabricate a gradient structured Ti workpiece without delamination...
March 2, 2018: Materials
Shoichi Kutsumizu, Yutaro Yamada, Tadashi Sugimoto, Nina Yamada, Taro Udagawa, Yohei Miwa
Rational design of molecules that exhibit a thermotropic bicontinuous cubic (Cub) phase has been earnestly desired. In this work, we describe the suitable selection of a molecular motif that has enabled the systematic exploitation of eight new series of Cub-phase molecules with symmetric molecular cores, N-n (1), PB-n (2), S-n (3), and PEB-n (4), and unsymmetric cores, B-N-n (5), B-PB-n (6), B-S-n (7), and B-PEB-n (8). These eight series all originate from achiral chain-core-chain type rod-like molecules that exhibit two types of Cub phases, an achiral Ia3d phase, and a chiral phase...
March 2, 2018: Physical Chemistry Chemical Physics: PCCP
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