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https://www.readbyqxmd.com/read/28550312/dependence-of-solidification-for-bi2te3-xsex-alloys-on-their-liquid-states
#1
Yuan Yu, Zhan Wu, Oana Cojocaru-Mirédin, Bin Zhu, Xiao-Yu Wang, Na Gao, Zhong-Yue Huang, Fang-Qiu Zu
The resistivity versus temperature (ρ-T) behaviours of liquid n-type Bi2Te3-x Se x (x = 0.3, 0.45 and 0.6) alloys are explored up to 1050 °C. A clear hump is observed on all ρ-T curves of the three studied Bi2Te3-x Se x melts during the heating process, which suggests that a temperature-induced liquid-liquid structural transition takes place in the melts. Based on this information, the solidification behaviours and microstructures of the alloys with different liquid states are investigated. The samples that experienced liquid structural transition show that the nucleation and growth undercooling degrees are conspicuously enlarged and the solidification time is shortened...
May 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28543925/comparative-effect-of-different-polymerization-techniques-on-the-flexural-and-surface-properties-of-acrylic-denture-bases
#2
Mohammed M Gad, Shaimaa M Fouda, Aws S ArRejaie, Ahmad M Al-Thobity
PURPOSE: Polymerization techniques have been modified to improve physical and mechanical properties of polymethylmethacrylate (PMMA) denture base, as have the laboratory procedures that facilitate denture construction techniques. The purpose of the present study was to investigate the effect of autoclave polymerization on flexural strength, elastic modulus, surface roughness, and the hardness of PMMA denture base resins. MATERIALS AND METHODS: Major Base and Vertex Implacryl heat-polymerized acrylic resins were used to fabricate 180 specimens...
May 22, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28542085/quantitative-analysis-of-depth-distribution-and-density-of-cysts-in-acanthamoeba-keratitis-using-confocal-microscopy
#3
Ping Huang, Tudor Tepelus, Laura A Vickers, Elmira Baghdasaryan, Jianyan Huang, John A Irvine, Hugo Y Hsu, Srinivas Sadda, Olivia L Lee
PURPOSE: To quantify the density, distribution, and depth of invasion of cysts in the corneas of eyes with acanthamoeba keratitis (AK) by in vivo confocal microscopy (IVCM) with a novel scanning pattern. METHODS: The medical records of patients with AK evaluated at the Doheny Eye Center UCLA between September 2014 and July 2016 were reviewed retrospectively. Patients with clinically diagnosed AK underwent IVCM at various time points during their clinical course...
May 23, 2017: Cornea
https://www.readbyqxmd.com/read/28534286/development-of-a-novel-resin-based-dental-material-with-dual-biocidal-modes-and-sustained-release-of-ag-ions-based-on-photocurable-core-shell-agbr-cationic-polymer-nanocomposites
#4
Weiwei Cao, Yu Zhang, Xi Wang, Yinyan Chen, Qiang Li, Xiaodong Xing, Yuhong Xiao, Xuefeng Peng, Zhiwen Ye
Research on the incorporation of cutting-edge nano-antibacterial agent for designing dental materials with potent and long-lasting antibacterial property is demanding and provoking work. In this study, a novel resin-based dental material containing photocurable core-shell AgBr/cationic polymer nanocomposite (AgBr/BHPVP) was designed and developed. The shell of polymerizable cationic polymer not only provided non-releasing antibacterial capability for dental resins, but also had the potential to polymerize with other methacrylate monomers and prevented nanoparticles from aggregating in the resin matrix...
July 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28532496/erratum-to-manifesto-towards-a-clinically-oriented-psychometrics
#5
Andrew J Vickers, Ling Y Chen
No abstract text is available yet for this article.
May 22, 2017: Health and Quality of Life Outcomes
https://www.readbyqxmd.com/read/28532092/cytocompatibility-studies-of-titania-doped-calcium-borosilicate-bioactive-glasses-in-vitro
#6
Rajkumar Samudrala, Abdul Azeem P, Vasudevarao Penugurti, Bramanandam Manavathi
The present study aims to elucidate the applications of Titania (TiO2) doped calcium borosilicate glass as a biocompatible material in regenerative orthopedic applications. In this context, we have examined the bioactivity of various concentrations of TiO2 doped glasses with the help of simulated body fluid (SBF). Cytocompatibility, cell proliferation, and protein expression studies revealed the potential candidature of TiO2 doped glasses on osteoblast cell lines (MG-63). We hypothesized that TiO2 doped calcium borosilicate glasses are most cytocompatible material for bone implants...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532050/full-in-vitro-analyses-of-new-generation-bulk-fill-dental-composites-cured-by-halogen-light
#7
Tuçe Hazal Tekin, Aysel Kantürk Figen, Pınar Yılmaz Atalı, Bilge Coşkuner Filiz, Mehmet Burçin Pişkin
The objective of this study was to investigate the full in-vitro analyses of new-generation bulk-fill dental composites cured by halogen light (HLG). Two types' four composites were studied: Surefill SDR (SDR) and Xtra Base (XB) as bulk-fill flowable materials; QuixFill (QF) and XtraFill (XF) as packable bulk-fill materials. Samples were prepared for each analysis and test by applying the same procedure, but with different diameters and thicknesses appropriate to the analysis and test requirements. Thermal properties were determined by thermogravimetric analysis (TG/DTG) and differential scanning calorimetry (DSC) analysis; the Vickers microhardness (VHN) was measured after 1, 7, 15 and 30days of storage in water...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532015/effect-of-sintering-temperature-rise-from-870-to-920%C3%A2-c-on-physicomechanical-and-biological-quality-of-nano-hydroxyapatite-an-explorative-multi-phase-experimental-in-vitro-vivo-study
#8
Ahad Khoshzaban, Vahid Rakhshan, Farhood Najafi, Leila Aghajanpour, Seyed Jafar Hashemian, Saeed Heidari Keshel, Ikuya Watanabe, Alireza Valanezhad, Tahereh Sadat Jafarzadeh Kashi
Hydroxyapatite (HA) is a proper scaffold for bone repair, however, it is not of excellent mechanical properties. Most previous studies on the effect of temperature increases were in vitro and had assessed merely improvements of HA's physicomechanical quality. This in vitro/vivo study investigated the effect of temperature increases from 870 to 920°C on physicomechanical and biological quality of Nano-HA. Forty experimentally produced HA disks sintered at 870 to 920°C were prepared (n=20×2). Disks were subjected to Vickers microindentation test (1 disk from each group divided into 4 quarters), Fourier transform infrared spectroscopy (1 disk), X-ray diffraction (XRD) [1 disk together with non-sintered HA], field emission scanning electron microscopy (FSEM, 1 disk from each group together with non-sintered HA), cell seeding and SEM assessment (2 disks), MTT assay over 4 different time periods (16 quadrants of 4 disks from each group), 6 one-thirds of 2 disks from each group for immunocytochemical (ICC) assay, and 8 disks from each group [as well as non-sintered HA] for the animal study (implantation in 4 sockets in 8 rabbits [32 specimens], histomorphometry, and computerized tomography) over two time periods...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28526443/mechanical-properties-of-polymer-infiltrated-ceramic-sodium-aluminum-silicate-composites-for-dental-restoration
#9
Bencang Cui, Jing Li, Huining Wang, Yuanhua Lin, Yang Shen, Ming Li, Xuliang Deng, Cewen Nan
OBJECTIVE: To fabricate indirect restorative composites for CAD/CAM applications and evaluate the mechanical properties. METHODS: Polymer-infiltrated-ceramic composites were prepared through infiltrating polymer into partially sintered sodium aluminum silicate ceramic blocks and curing. The corresponding samples were fabricated according to standard ISO-4049 using for mechanical properties measurement. The flexural strength and fracture toughness were measured using a mechanical property testing machine...
May 16, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28511509/comparative-evaluation-of-colour-stability-and-surface-hardness-of-methacrylate-based-flowable-and-packable-composite-in-vitro-study
#10
Saron Ramesh Nair, Nandini Thipannanavar Niranjan, Arun Jayasheel, Deepak Bythnal Suryakanth
INTRODUCTION: With the advent of new technology in material sciences in recent years, the quality of composite resin restorations has improved; however, discolouration and wear of composite resin materials remains to be a major problem in long-term clinical studies. AIM: The aim of the present study was to compare the colour stability and surface hardness of methacrylate based flowable nano composite with methacrylate based packable nano composite. MATERIALS AND METHODS: The difference in colour stability and microhardness of the three composites: G aenial Universal Flo (GC India), Filtek Z350XT (3MESPE) and Tetric N Ceram (Ivoclar Vivadent) were evaluated...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28510375/the-effect-of-irradiation-distance-on-light-transmittance-and-vickers-hardness-ratio-of-two-bulk-fill-resin-based-composites
#11
Zahra Almuallem, Sinead McDonnell, Antoniella Busuttil-Naudi, Ario Santini
The aims of this study were to assess the light energy transmission and Vickers hardness (VH) ratio of two bulk-fill resin-based composites (RBCs) (Tetric EvoCeram and Filtek) cured at different distances between the light curing unit's (LCU) tip and the surface of the restoration (T-S) using either a Bluephase G2, Bluephase® 'turbo tip' or Bluephase Style LCU. Samples were cured from the top at T-S distances of 2mm, 6mm and 10mm for 20 seconds. A MARC-Resin-Calibrator™ recorded the transmitted irradiance reaching the bottom of the sample, in real time...
December 2016: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28505227/resveratrol-enhances-exercise-induced-cellular-and-functional-adaptations-of-skeletal-muscle-in-older-men-and-women
#12
Stephen E Alway, Jean L McCrory, Kalen Kearcher, Austen Vickers, Benjamin Frear, Diana L Gilleland, Daniel E Bonner, James M Thomas, David A Donley, Mathew W Lively, Junaith S Mohamed
Older men (n = 12) and women (n = 18) 65-80 years of age completed 12 weeks of exercise and took either a placebo or resveratrol (500 mg/d) to test the hypothesis that resveratrol treatment combined with exercise would increase mitochondrial density, muscle fatigue resistance and cardiovascular function more than exercise alone. Contrary to our hypothesis, aerobic and resistance exercise coupled with resveratrol treatment did not reduce cardiovascular risk further than exercise alone. However, exercise added to resveratrol treatment improved the indices of mitochondrial density, and muscle fatigue resistance more than placebo and exercise treatments...
May 13, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28487739/food-simulating-organic-solvents-for-evaluating-crosslink-density-of-bulk-fill-composite-resin
#13
Neveen M Ayad, Hala A Bahgat, Eman Hussain Al Kaba, Maryam Hussain Buholayka
Objectives. To evaluate crosslink densities of two bulk fill composite resins and determine if the used Food Simulating Organic Solvent (FSOS) affected them. Methods. Forty specimens were prepared from SureFill and SonicFill bulk fill composite resins, 20 each. All specimens were stored dry for 24 h. Each group was divided into 2 subgroups: stored in ethanol (E) 75% or in methyl ethyl ketone (MEK) 100% for 24 h. Crosslink density was evaluated by calculating the difference between the Vickers hardness numbers of the specimens stored dry and after their storage in FSOS...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28486178/sex-differences-in-salivary-cortisol-reactivity-to-the-trier-social-stress-test-tsst-a-meta-analysis
#14
Jenny J W Liu, Natalie Ein, Katlyn Peck, Vivian Huang, Jens C Pruessner, Kristin Vickers
Some, but not all studies using the Trier Social Stress Test (TSST) have demonstrated evidence in support of sex differences in salivary cortisol. The aim of the current meta-analysis is to examine sex differences in salivary cortisol following exposure to the TSST. We further explored the effects of modifications to the TSST protocol and procedural variations as potential moderators. We searched articles published from January, 1993 to February, 2016 in MedLine, PsychINFO, and ProQuest Theses and Dissertations...
April 24, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28475759/newprot-a-protein-engineering-portal
#15
Andreas Schwarte, Maika Genz, Lilly Skalden, Alberto Nobili, Clare Vickers, Okke Melse, Remko Kuipers, Henk-Jan Joosten, Jan Stourac, Jaroslav Bendl, Jon Black, Peter Haase, Coos Baakman, Jiri Damborsky, Uwe Bornscheuer, Gert Vriend, Hanka Venselaar
The NewProt protein engineering portal is a one-stop-shop for in silico protein engineering. It gives access to a large number of servers that compute a wide variety of protein structure characteristics supporting work on the modification of proteins through the introduction of (multiple) point mutations. The results can be inspected through multiple visualizers. The HOPE software is included to indicate mutations with possible undesired side effects. The Hotspot Wizard software is embedded for the design of mutations that modify a proteins' activity, specificity, or stability...
May 5, 2017: Protein Engineering, Design & Selection: PEDS
https://www.readbyqxmd.com/read/28470953/mechanical-characteristics-of-counterfeit-reciproc-instruments-a-call-for-attention
#16
C S Rodrigues, V T L Vieira, H S Antunes, G De-Deus, C N Elias, E J L Moreira, E J N L Silva
AIM: To report here the main differences between the visual aspects of original and counterfeit Reciproc instruments, together with an evaluation of instrument bending resistance, cyclic fatigue, surface finish, Vickers microhardness, and chemical composition. METHODOLOGY: The visual aspects of original Reciproc R25 (VDW, Munich, Germany) and counterfeit Reciproc R25 instruments (claimed to be original, supposedly with dimensions similar to those of Reciproc R25 files, bought at www...
May 4, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28470622/green-synthesis-and-characterization-of-ag-nanoparticles-from-mangifera-indica-leaves-for-dental-restoration-and-antibacterial-applications
#17
Dola Sundeep, T Vijaya Kumar, P S Subba Rao, R V S S N Ravikumar, A Gopala Krishna
Green synthesis has gained a wide recognition as clean synthesis technique in the recent years. In the present investigation, silver nanoparticles were prepared by a novel green synthesis technique using Mangifera indica (Mango leaves) and found to be successfully used in dental applications. The prepared samples were spectroscopically characterized by XRD, PSA, SEM with EDS, and UV-Vis spectroscopy. The crystalline size and lattice strain were analyzed from the XRD data which were counter-verified by W-H plots and particle size analyzer...
May 3, 2017: Progress in biomaterials
https://www.readbyqxmd.com/read/28469827/comparative-evaluation-of-nano-hydroxyapatite-preparation-and-calcium-sucrose-phosphate-on-microhardness-of-deciduous-teeth-after-iron-drop-exposure-an-in-vitro-study
#18
Nilesh Rathi, Rutika Baid, Sudhindra Baliga, Nilima Thosar
BACKGROUND: To evaluate and compare the microhardness of deciduous teeth treated with nano-hydroxyapatite and calcium sucrose phosphate after iron drop exposure. MATERIAL AND METHODS: Twenty healthy anterior deciduous teeth were collected and stored in 0.9% saline solution at room temperature. All the teeth were immersed in artificial saliva in an incubator shaker at 37° for an hour and then subjected to Vickers microhardness test at 100g load for 5 seconds. The teeth were then immersed in iron drop for 5 minutes, twice daily, rinsed with distilled water and kept in artificial saliva...
April 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28462786/improving-human-papillomavirus-vaccine-use-in-an-integrated-health-system-impact-of-a-provider-and-staff-intervention
#19
Huong Q McLean, Jeffrey J VanWormer, Brian D W Chow, Becky Birchmeier, Elizabeth Vickers, Edna DeVries, James Meyer, Jeffrey Moore, Michael M McNeil, Shannon Stokley, Julianne Gee, Edward A Belongia
PURPOSE: Acceptance and coverage of the human papillomavirus (HPV) vaccine in the United States has been suboptimal. We implemented a multifaceted provider and staff intervention over a 1-year period to promote HPV vaccination in a regional health care system. METHODS: The intervention was conducted in nine clinical departments from February 2015 to March 2016; 34 other departments served as controls. The intervention included in-person provider and staff education, quarterly feedback of vaccine coverage, and system-wide changes to patient reminder and recall notifications...
April 24, 2017: Journal of Adolescent Health: Official Publication of the Society for Adolescent Medicine
https://www.readbyqxmd.com/read/28461207/efficacy-and-safety-of-ridinilazole-compared-with-vancomycin-for-the-treatment-of-clostridium-difficile-infection-a-phase-2-randomised-double-blind-active-controlled-non-inferiority-study
#20
Richard J Vickers, Glenn S Tillotson, Richard Nathan, Sabine Hazan, John Pullman, Christopher Lucasti, Kenneth Deck, Bruce Yacyshyn, Benedict Maliakkal, Yves Pesant, Bina Tejura, David Roblin, Dale N Gerding, Mark H Wilcox
BACKGROUND: Clostridium difficile infection is the most common health-care-associated infection in the USA. We assessed the safety and efficacy of ridinilazole versus vancomycin for treatment of C difficile infection. METHODS: We did a phase 2, randomised, double-blind, active-controlled, non-inferiority study. Participants with signs and symptoms of C difficile infection and a positive diagnostic test result were recruited from 33 centres in the USA and Canada and randomly assigned (1:1) to receive oral ridinilazole (200 mg every 12 h) or oral vancomycin (125 mg every 6 h) for 10 days...
April 28, 2017: Lancet Infectious Diseases
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