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https://www.readbyqxmd.com/read/28102270/marijuana-s-benefits-antarctic-ice-cracks-and-a-500-million-donation
#1
(no author information available yet)
No abstract text is available yet for this article.
January 18, 2017: Nature
https://www.readbyqxmd.com/read/28100196/exposure-to-hepatitis-c-virus-in-homeless-men-in-central-brazil-a-cross-sectional-study
#2
Priscilla Martins Ferreira, Rafael Alves Guimarães, Christiane Moreira Souza, Lara Cristina da Cunha Guimarães, Cleiciane Vieira de Lima Barros, Karlla Antonieta Amorim Caetano, Giovanni Rezza, Lila Spadoni, Sandra Maria Brunini
BACKGROUND: Homeless men are highly vulnerable to acquisition of the hepatitis C virus (HCV) compared to the general population. In Brazil, a country of continental dimensions, the extent of HCV infection in this population remains unknown. The objective of this study is to investigate the epidemiological profile of exposure to HCV in homeless men in Central Brazil. METHODS: A Cross-sectional study was conducted in 481 men aged over 18 years attending therapeutic communities specialized in the recovery and reintegration of homeless people...
January 18, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28098140/dynamical-observations-on-the-crack-tip-zone-and-stress-corrosion-of-two-dimensional-mos2
#3
Thuc Hue Ly, Jiong Zhao, Magdalena Ola Cichocka, Lain-Jong Li, Young Hee Lee
Whether and how fracture mechanics needs to be modified for small length scales and in systems of reduced dimensionality remains an open debate. Here, employing in situ transmission electron microscopy, atomic structures and dislocation dynamics in the crack tip zone of a propagating crack in two-dimensional (2D) monolayer MoS2 membrane are observed, and atom-to-atom displacement mapping is obtained. The electron beam is used to initiate the crack; during in situ observation of crack propagation the electron beam effect is minimized...
January 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28095872/an-unusual-combined-thymic-carcinoma-composed-of-squamous-cell-carcinoma-and-type-ab-thymoma-a-rare-case-report
#4
Yufeng Jiang, Yang Liu, Xiuying Shi, Xiaoyun Mao, Yang Zhao, Chuifeng Fan
BACKGROUND: Combined thymic carcinoma is a malignant neoplasm of the thymus recently added to the 4th edition of the World Health Organization (WHO) classification of tumors of the lung, pleura, thymus and heart. It involves at least one type of thymic carcinoma and another thymic epithelial tumor. The previously used term "combined thymic epithelial tumor" has been abandoned. CASE PRESENTATION: Here, we present an unusual case of combined thymic carcinoma of the thymus in a 44-year-old male who had suffered from fever, chest pain, chest tightness and shortness of breath...
January 17, 2017: Diagnostic Pathology
https://www.readbyqxmd.com/read/28095797/cocaine-crack-use-is-not-associated-with-fibrosis-progression-measured-by-ast-to-platelet-ratio-index-in-hiv-hcv-co-infected-patients-a-cohort-study
#5
Valérie Martel-Laferrière, Roy Nitulescu, Joseph Cox, Curtis Cooper, Mark Tyndall, Danielle Rouleau, Sharon Walmsley, Leo Wong, Marina B Klein
BACKGROUND: Cocaine and crack use has been associated with HIV and HCV infections, but its consequences on HCV progression have not been well established. We analyzed the impact of cocaine/crack use on liver fibrosis progression in a cohort of HIV-HCV co-infected patients. METHODS: A Canadian multicenter prospective cohort study followed 1238 HIV-HCV co-infected persons every 6 months between 2003 and 2013. Data were analyzed from 573 patients with positive HCV RNA, not on HCV treatment, without significant liver fibrosis (AST-to-Platelet Ratio Index (APRI) <1...
January 17, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28095568/efficacy-of-a-moisturizing-foam-in-skin-barrier-regeneration-and-itch-relief-in-subjects-prone-to-atopic-dermatitis
#6
Peter A Lio
INTRODUCTION: Atopic dermatitis (AD) is characterized by impaired epidermal barrier with increased transepidermal water loss (TEWL). Scratching further compromises skin integrity, contributing to a cycle of inflammation. The objective of the present study was to investigate a topical anti-itch foam in improving skin barrier and itch. MATERIAL AND METHODS: A single center open study was performed on 26 adults previously diagnosed with AD but without active lesions...
November 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28094915/ultrasensitive-stretchable-strain-sensors-based-on-fragmented-carbon-nanotube-papers
#7
Jian Zhou, Hu Yu, Xuezhu Xu, Fei Han, Gilles Lubineau
The development of strain sensors featuring both ultra high sensitivity and high stretchability is still a challenge. We demonstrate that strain sensors based on fragmented single-walled carbon nanotube (SWCNT) paper embedded in poly (dimethylsiloxane) (PDMS) can sustain their sensitivity even at very high strain levels (with a gauge factor of over 10(7) at 50 % strain). This record sensitivity is ascribed to the low initial electrical resistance (5-28 Ω) of the SWCNT paper and the wide change in resistance (up to 10(6) Ω) governed by the percolated network of SWCNT in the cracked region...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094256/cymbiola-nobilis-shell-toughening-mechanisms-in-a-crossed-lamellar-structure
#8
Hongmei Ji, Xiaowu Li, Daolun Chen
Natural structural materials with intricate hierarchical architectures over several length scales exhibit excellent combinations of strength and toughness. Here we report the mechanical response of a crossed-lamellar structure in Cymbiola nobilis shell via stepwise compression tests, focusing on toughening mechanisms. At the lower loads microcracking is developed in the stacked direction, and channel cracking along with uncracked-ligament bridging and aragonite fiber bridging occurs in the tiled direction. At the higher loads the main mechanisms involve cracking deflection in the bridging lamellae in the tiled direction alongside step-like cracking in the stacked direction...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28094026/nanoporous-hydroxyapatite-sodium-titanate-bilayer-on-titanium-implants-for-improved-osteointegration
#9
A Carradò, F Perrin-Schmitt, Q V Le, M Giraudel, C Fischer, G Koenig, L Jacomine, L Behr, A Chalom, L Fiette, A Morlet, G Pourroy
OBJECTIVE: The aim of this study was to improve the strength and quality of the titanium-hydroxyapatite interface in order to prevent long-term failure of the implanted devices originating from coating delamination and to test it in an in-vivo model. METHODS: Ti disks and dental commercial implants were etched in Kroll solution. Thermochemical treatments of the acid-etched titanium were combined with sol-gel hydroxyapatite (HA) coating processes to obtain a nanoporous hydroxyapatite/sodium titanate bilayer...
January 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28093833/cracking-the-code-residents-interpretations-of-written-assessment-comments
#10
Shiphra Ginsburg, Cees Pm van der Vleuten, Kevin W Eva, Lorelei Lingard
CONTEXT: Interest is growing in the use of qualitative data for assessment. Written comments on residents' in-training evaluation reports (ITERs) can be reliably rank-ordered by faculty attendings, who are adept at interpreting these narratives. However, if residents do not interpret assessment comments in the same way, a valuable educational opportunity may be lost. OBJECTIVES: Our purpose was to explore residents' interpretations of written assessment comments using mixed methods...
January 16, 2017: Medical Education
https://www.readbyqxmd.com/read/28092829/enhancing-4-propylheptane-dissociation-with-nickel-nanocluster-based-on-molecular-dynamics-simulations
#11
Margarita G Ilyina, Edward M Khamitov, Rail N Galiakhmetov, Ildar A Mustafin, Akhat G Mustafin
In the present work, a 0.4nm nickel cluster has been theoretically studied. Its equilibrium structural parameters have been calculated by the DFT method based on the PBEH1PBE hybrid functional and split-valence basis set Lanl2DZ including effective core potentials. We have systematically considered diverse spin states of this cluster and find out its ground state. The relative stability of these states depends on the HOMO-LUMO gap. The interaction of the Ni6 with 4-propylheptane С10Н22 has been studied to simulate the process of catalytic cracking of hydrocarbons...
January 3, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28091602/intragranular-cracking-as-a-critical-barrier-for-high-voltage-usage-of-layer-structured-cathode-for-lithium-ion-batteries
#12
Pengfei Yan, Jianming Zheng, Meng Gu, Jie Xiao, Ji-Guang Zhang, Chong-Min Wang
LiNi1/3Mn1/3Co1/3O2-layered cathode is often fabricated in the form of secondary particles, consisting of densely packed primary particles. This offers advantages for high energy density and alleviation of cathode side reactions/corrosions, but introduces drawbacks such as intergranular cracking. Here, we report unexpected observations on the nucleation and growth of intragranular cracks in a commercial LiNi1/3Mn1/3Co1/3O2 cathode by using advanced scanning transmission electron microscopy. We find the formation of the intragranular cracks is directly associated with high-voltage cycling, an electrochemically driven and diffusion-controlled process...
January 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/28089394/grinding-damage-assessment-for-cad-cam-restorative-materials
#13
Philippe Curran, Maria Cattani-Lorente, H W Anselm Wiskott, Stéphane Durual, Susanne S Scherrer
OBJECTIVES: To assess surface/subsurface damage after grinding with diamond discs on five CAD-CAM restorative materials and to estimate potential losses in strength based on crack size measurements of the generated damage. METHODS: The materials tested were: Lithium disilicate (LIT) glass-ceramic (e.max CAD), leucite glass-ceramic (LEU) (Empress CAD), feldspar ceramic (VM2) (Vita Mark II), feldspar ceramic-resin infiltrated (EN) (Enamic) and a composite reinforced with nano ceramics (LU) (Lava Ultimate)...
January 12, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28088693/reinforcement-of-a-pmma-resin-for-interim-fixed-prostheses-with-silica-nanoparticles
#14
Marianthi Topouzi, Eleana Kontonasaki, Dimitrios Bikiaris, Lambrini Papadopoulou, Konstantinos M Paraskevopoulos, Petros Koidis
PURPOSE: Fractures in long span provisional/interim restorations are a common complication. Adequate fracture toughness is necessary to resist occlusal forces and crack propagation, so these restorations should be constructed with materials of improved mechanical properties. The aim of this study was to investigate the possible reinforcement of neat silica nanoparticles and trietoxyvinylsilane-modified silica nanoparticles in a PMMA resin for fixed interim restorations. MATERIALS AND METHODS: Composite PMMA-Silica nanoparticles powders were mixed with PMMA liquid and compact bar shaped specimens were fabricated according to the British standard BS EN ISO 127337:2005...
January 9, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28088575/a-study-on-growth-and-pyrolysis-characteristics-of-microalgae-using-thermogravimetric-analysis-infrared-spectroscopy-and-synchrotron-fourier-transform-infrared-spectroscopy
#15
Fanghua Li, Srikanth Chakravartula Srivatsa, Warren Batchelor, Sankar Bhattacharya
This two-part study firstly investigated Tetraselmis suecica grown in different CO2 (0.04-15%v/v) concentration through indoor and outdoor cultivation systems. A high CO2 concentration led to a high lipid content, and low nitrogen and oxygen content, which are desirable for transport fuel production. Pyrolysis characteristics were investigated by TG-IR and synchrotron IR microscopy. The results show Tetraselmis suecica grown in 10%CO2 had the highest decomposition rate corresponding to more volatile products produced during the main thermal cracking stage and derived from protein-and lipid-corresponding functional groups...
January 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28088459/strain-development-in-bulk-filled-cavities-of-different-depths-characterized-using-a-non-destructive-acoustic-emission-approach
#16
Annelies Van Ende, Diogo Pedrollo Lise, Jan De Munck, Johan Vanhulst, Martine Wevers, Bart Van Meerbeek
OBJECTIVES: (1) To evaluate the effect of cavity depth and composite type on the interfacial debonding in bulk-filled cavities. (2) To correlate the theoretical shrinkage stress and the level of interfacial debonding determined by acoustic emission (AE). METHODS: 80 sound molars were divided in two groups to receive a Class-I cavity (3.5×3.5mm) with 2.5- or 4.0-mm depth. The cavities were restored with either a conventional paste-like (Filtek Z100, 3M ESPE), a conventional flowable (G-ænial Universal Flo, GC), a bulk-fill paste-like (Tetric EvoCeram Bulk Fill, Ivoclar Vivadent) or a bulk-fill flowable (SDR, Dentsply) composite (n=10)...
January 11, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28086980/inflammation-in-epileptogenesis-after-traumatic-brain-injury
#17
REVIEW
Kyria M Webster, Mujun Sun, Peter Crack, Terence J O'Brien, Sandy R Shultz, Bridgette D Semple
BACKGROUND: Epilepsy is a common and debilitating consequence of traumatic brain injury (TBI). Seizures contribute to progressive neurodegeneration and poor functional and psychosocial outcomes for TBI survivors, and epilepsy after TBI is often resistant to existing anti-epileptic drugs. The development of post-traumatic epilepsy (PTE) occurs in a complex neurobiological environment characterized by ongoing TBI-induced secondary injury processes. Neuroinflammation is an important secondary injury process, though how it contributes to epileptogenesis, and the development of chronic, spontaneous seizure activity, remains poorly understood...
January 13, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28081146/maternal-nutrition-during-pregnancy-affects-testicular-and-bone-development-glucose-metabolism-and-response-to-overnutrition-in-weaned-horses-up-to-two-years
#18
Morgane Robles, Camille Gautier, Luis Mendoza, Pauline Peugnet, Cédric Dubois, Michèle Dahirel, Jean-Philippe Lejeune, Isabelle Caudron, Isabelle Guenon, Sylvaine Camous, Anne Tarrade, Laurence Wimel, Didier Serteyn, Hélène Bouraima-Lelong, Pascale Chavatte-Palmer
INTRODUCTION: Pregnant mares and post-weaning foals are often fed concentrates rich in soluble carbohydrates, together with forage. Recent studies suggest that the use of concentrates is linked to alterations of metabolism and the development of osteochondrosis in foals. The aim of this study was to determine if broodmare diet during gestation affects metabolism, osteoarticular status and growth of yearlings overfed from 20 to 24 months of age and/or sexual maturity in prepubertal colts...
2017: PloS One
https://www.readbyqxmd.com/read/28079721/an-exploratory-study-to-assess-individual-and-structural-level-barriers-associated-with-poor-retention-and-re-engagement-in-care-among-persons-living-with-hiv-aids
#19
Jonathan Colasanti, Natalie Stahl, Eugene W Farber, Carlos Del Rio, Wendy S Armstrong
BACKGROUND: Retention in care is the most challenging step along the HIV care continuum. Many patients who engage in care and achieve viral suppression have care interruptions, characterized by moving in and out of care ("churn"). Poor retention has clinical consequences and contributes to new HIV transmissions, but how to predict or prevent it remains elusive. This study sought to understand the relationship between individual- and structural-level barriers, and poor retention for persons living with HIV/AIDS in Atlanta, GA...
February 1, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/28079216/one-step-hydroprocessing-of-fatty-acids-into-renewable-aromatic-hydrocarbons-over-ni-hzsm-5-insights-into-the-major-reaction-pathways
#20
Shiyou Xing, Pengmei Lv, Jiayan Wang, Junying Fu, Pei Fan, Lingmei Yang, Gaixiu Yang, Zhenhong Yuan, Yong Chen
For high caloricity and stability in bio-aviation fuels, a certain content of aromatic hydrocarbons (AHCs, 8-25 wt%) is crucial. Fatty acids, obtained from waste or inedible oils, are a renewable and economic feedstock for AHC production. Considerable amounts of AHCs, up to 64.61 wt%, were produced through the one-step hydroprocessing of fatty acids over Ni/HZSM-5 catalysts. Hydrogenation, hydrocracking, and aromatization constituted the principal AHC formation processes. At a lower temperature, fatty acids were first hydrosaturated and then hydrodeoxygenated at metal sites to form long-chain hydrocarbons...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
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