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https://www.readbyqxmd.com/read/28646917/polycaprolactone-nanofiber-scaffold-enhances-the-osteogenic-differentiation-potency-of-various-human-tissue-derived-mesenchymal-stem-cells
#1
Ruyue Xue, Yuna Qian, Linhao Li, Guidong Yao, Li Yang, Yingpu Sun
BACKGROUND: Polycaprolactone (PCL) has been regarded as a promising synthetic material for bone tissue engineering application. Owing to its unique biochemical properties and great compatibility, PCL fibers have come to be explored as a potential delivering scaffold for stem cells to support bone regeneration during clinical application. METHODS: The human derived mesenchymal stem cells (MSCs) were obtained from umbilical cord (UC), bone marrow (BM), and adipose tissue (AD), respectively...
June 24, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28642957/superacid-promoted-synthesis-of-highly-porous-hypercrosslinked-polycarbazoles-for-efficient-co2-capture
#2
Xiang Zhu, Shunmin Ding, Carter W Abney, Katie L Browning, Robert L Sacci, Gabriel M Veith, Chengcheng Tian, Sheng Dai
A superacid-promoted "knitting" strategy has been developed for the generation of a novel family of hypercrosslinked nanoporous polycarbazoles for efficient CO2 capture. Using trifluoromethanesulfonic acid, a Brønsted superacid, we demonstrate the facile and rapid synthesis of highly porous polycarbazoles with BET surface areas as high as 1688 m(2) g(-1), and capable of adsorbing 3.5 mmol g(-1) of CO2 at 298 K and 1 bar. This impressive result bestows the material with the highest CO2 uptake capacity for all nanoporous carbazolic polymers and ranks among the best by known porous organic polymers under this condition...
June 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28640294/space-confined-synthesis-of-multilayer-cu-n-doped-graphene-nanosheets-for-efficient-oxygen-electroreduction
#3
Yangyang Ni, Zhengyan Chen, Fantao Kong, Yu Qiao, Aiguo Kong, Yongkui Shan
Cu-based carbon electrocatalysts for the oxygen reduction reaction are difficult to compare with the corresponding Fe- or Co-based electrocatalytic materials, owing to their insufficient catalytic activity and stability. Herein, as an impressive Cu-based electrocatalyst, a multilayer Cu-N-doped graphene sheet (Cu-N-GR) is directly synthesized by the thermal conversion of copper(ii) 2,2'-bipyridine in the confined space of lamellar montmorillonites. The open layered morphology of Cu-N-GR materials facilitated the exposure of more active centers and enhanced the flexibility and mobility of charge carriers...
June 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28639401/van-der-waals-epitaxial-growth-of-atomic-layered-hfs2-crystals-for-ultrasensitive-near-infrared-phototransistors
#4
Lei Fu, Feng Wang, Bin Wu, Nian Wu, Wei Huang, Hanlin Wang, Chuanhong Jin, Lin Zhuang, Jun He, Lei Fu, Yunqi Liu
As a member of the group IVB transition metal dichalcogenides (TMDs) family, hafnium disulfide (HfS2 ) is recently predicted to exhibit higher carrier mobility and higher tunneling current density than group VIB (Mo and W) TMDs. However, the synthesis of high-quality HfS2 crystals, sparsely reported, has greatly hindered the development of this new field. Here, a facile strategy for controlled synthesis of high-quality atomic layered HfS2 crystals by van der Waals epitaxy is reported. Density functional theory calculations are applied to elucidate the systematic epitaxial growth process of the S-edge and Hf-edge...
June 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28631135/long-term-clinical-benefit-from-salvage-egfr-tyrosine-kinase-inhibitors-in-advanced-non-small-cell-lung-cancer-patients-with-egfr-wild-type-tumors
#5
F Koinis, A Voutsina, A Kalikaki, A Koutsopoulos, E Lagoudaki, E Tsakalaki, E K Dermitzaki, E Kontopodis, A G Pallis, V Georgoulias, A Kotsakis
BACKGROUND: Erlotinib has been approved for the management of NSCLC patients after failure of the first or subsequent line of chemotherapy. Although the efficacy of erlotinib is clearly associated with the presence of EGFR mutations, there is a subset of patients with EGFR wild-type (EGFRwt) tumors who impressively respond. PATIENTS AND METHODS: Patients with EGFRwt NSCLC who received salvage (≥2nd line) treatment with erlotinib for a prolonged period (>6 months), were sought from the database of the Hellenic Oncology Research Group...
June 19, 2017: Clinical & Translational Oncology
https://www.readbyqxmd.com/read/28630955/chairside-systems-a-current-review
#6
Markus Zaruba, Albert Mehl
Since Cerec (Chairside Economical Restoration of Esthetic Ceramics) was introduced as the first dental chairside computer-aided design/computer-aided manufacturing (CAD/CAM) system in the mid-1980s, this technology has enjoyed growing popularity, particularly in the recent past. There has been a considerable increase in the number of available chairside systems in only the last few years. One of the main reasons for this is that intraoral scanners have become increasingly better, smaller, and faster, while the design software has become more and more user-friendly...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28629217/ultrasensitive-pressure-sensor-based-on-ultralight-sparkling-graphene-block
#7
Lingxiao Lv, Panpan Zhang, Tong Xu, Liangti Qu
Approaching to the super-sensitivity, we herein develop a pressure sensor based on fully bubbled ultralight graphene block through a simple sparkling strategy. The obtained sparking graphene block (SGB) exhibits excellent elasticity even at 95% compressive strain and rebounds a steel ball with an ultra-fast recovery speed (~1085 mm s-1). Particularly, the SGB based sensor reveals a record pressure sensitivity of 229.8 kPa-1, much higher than other graphene materials due to the highly cavity-branched internal structure...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28628326/improved-sodium-ion-storage-performance-of-ultrasmall-iron-selenide-nanoparticles
#8
Feipeng Zhao, Sida Shen, Liang Cheng, Lu Ma, Junhua Zhou, Hualin Ye, Na Han, Tianpin Wu, Yanguang Li, Jun Lu
Sodium-ion batteries are potential low-cost alternatives to current lithium-ion technology, yet their performance still fall short of expectation due to the lack of suitable electrode materials with large capacity, long-term cycling stability and high-rate performance. In this work, we demonstrated that ultrasmall (~5 nm) iron selenide (FeSe2) nanoparticles exhibited a remarkable performance for sodium-ion storage. They were prepared from a high-temperature solution method with a narrow size distribution and high yield, and could be readily redispersed in non-polar organic solvents...
June 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28627876/graphene-decorated-indium-sulfide-nanoparticles-as-high-performance-anode-for-sodium-ion-battery
#9
Xia Wang, Jang-Yeon Hwang, Seung-Taek Myung, Jusef Hassoun, Yang-Kook Sun
We report a highly performing anode material for sodium-ion batteries (SIBs), composed of graphene decorated indium sulfide (In2S3). The composite material is synthesized by adopting a facile hydrothermal pathway with subsequent annealing, and characterized by defined structure and well-tailored morphology, as indeed demonstrated by X-ray diffraction, spectroscopy as well as high resolution microscopy. These optimal characteristics allow the electrode to perform remarkably in sodium cell by achieving a maximum specific capacity as high as 620 mAh g-1, and the still relevant value of 335 mAh g-1 at an extremely high current (i...
June 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28621353/ternary-gradient-metal-organic-frameworks
#10
Chong Liu, Nathaniel L Rosi
Gradient MOFs contain directional gradients of either structure or functionality. We have successfully prepared two ternary gradient MOFs based on bMOF-100 analogues, namely bMOF-100/102/106 and bMOF-110/100/102, via cascade ligand exchange reactions. The cubic unit cell parameter discrepancy within an individual ternary gradient MOF crystal is as large as ∼1 nm, demonstrating the impressive compatibility and flexibility of the component MOF materials. Because of the presence of a continuum of unit cells, the pore diameters within individual crystals also change in a gradient fashion from ∼2...
June 16, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28618432/accuracy-of-digital-vs-conventional-implant-impression-approach-a-three-dimensional-comparative-in-vitro-analysis
#11
Kinga Basaki, Hasan Alkumru, Grace De Souza, Yoav Finer
PURPOSE: To assess the three-dimensional (3D) accuracy and clinical acceptability of implant definitive casts fabricated using a digital impression approach and to compare the results with those of a conventional impression method in a partially edentulous condition. MATERIALS AND METHODS: A mandibular reference model was fabricated with implants in the first premolar and molar positions to simulate a patient with bilateral posterior edentulism. Ten implant-level impressions per method were made using either an intraoral scanner with scanning abutments for the digital approach or an open-tray technique and polyvinylsiloxane material for the conventional approach...
June 14, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28616963/novel-quaternary-chalcogenide-rgo-based-asymmetric-supercapacitor-with-high-energy-density
#12
Samrat Sarkar, Promita Howli, Biswajit Das, Nirmalya Sankar Das, Madhupriya Samanta, Gopes C Das, Kalyan Kumar Chattopadhyay
In this work we have synthesized quaternary chalcogenide Cu2NiSnS4 (QC) nanoparticles grown in-situ on 2D reduced graphene oxide (rGO) for application as anode material of solid state asymmetric supercapacitors (ASC). Thorough characterization of the synthesized composite validates the proper phase, stoichiometry and morphology. Detailed electrochemical study of the electrode materials and ASC has been performed. The as fabricated device delivers an exceptionally high areal capacitance (655.1 mF cm-2) which is much superior to commercial micro supercapacitors...
June 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28594162/mn-based-cathode-with-synergetic-layered-tunnel-hybrid-structures-and-their-enhanced-electrochemical-performance-in-sodium-ion-batteries
#13
Zhen-Guo Wu, Jun-Tao Li, Yan-Jun Zhong, Xiao-Dong Guo, Ling Huang, Ben-He Zhong, Daniel-Adjei Agyeman, Jin-Myoung Lim, Du-Ho Kim, Maeng-Hyo Cho, Yong-Mook Kang
A synergistic approach for advanced cathode materials is proposed. Sodium manganese oxide with a layered-tunnel hybrid structure was designed, synthesized, and subsequently investigated. The layered-tunnel hybrid structure provides fast Na ion diffusivity and high structural stability thanks to the tunnel phase, enabling high rate capability and greatly improved cycling stability compared to that of the pure P2 layered phase while retaining the high specific capacity of the P2 layered phase. The hybrid structure provided a decent discharge capacity of 133...
June 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28594146/%C3%AF-co-oh-2-nanosheets-a-superior-pseudocapacitive-electrode-for-high-energy-supercapacitors
#14
Vanchiappan Aravindan
In this work, -Co(OH)2 nanosheets are explored as efficient pseudocapacitive material for the fabrication of 1.6 V class high energy supercapacitors in asymmetric fashion. As-synthesized -Co(OH)2 nanosheets displayed an excellent electrochemical performance owing to the unique structure, morphology and reversible reaction kinetics (fast Faradic reaction) in both three electrode and asymmetric configuration (with activated carbon, AC). For example, in three electrode set-up, -Co(OH)2 exhibits a high specific capacitance of ~675 F g-1 at scan rate of 1 mV s-1...
June 8, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28592110/mechanism-of-photocatalytic-water-splitting-with-graphitic-carbon-nitride-photochemistry-of-the-heptazine-water-complex
#15
Johannes Ehrmaier, Tolga N V Karsili, Andrzej L Sobolewski, Wolfgang Domcke
Impressive progress has recently been achieved in photocatalytic hydrogen evolution with polymeric carbon nitride materials consisting of heptazine building blocks. However, the fundamental mechanistic principles of the catalytic cycle are as yet poorly understood. Here, we provide first-principles computational evidence that water splitting with heptazine-based materials can be understood as a molecular excited-state reaction taking place in hydrogen-bonded heptazine-water complexes. The oxidation of water occurs homolytically via an electron/proton transfer from water to heptazine, resulting in ground-state heptazinyl and OH radicals...
June 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28586232/does-6-hours-of-contact-with-alginate-impression-material-affect-dental-cast-properties
#16
Amna Adam Ibrahim, Mohammed Nasser Alhajj, Nadia Khalifa, Magdi Wadie Gilada
Alginate impression (irreversible hydrocolloid) material is commonly used in dental practice because it is easy to mix, low in cost, and well tolerated by patients. The material is not dimensionally stable, however; thus, it is necessary to pour the impression immediately after the molding is accomplished, or within 60 minutes if the impression is kept in 100% humidity. Excessive contact of the alginate impression with the cast model over time may affect the model's properties. In this study, the authors tested the effect of contact time between an alginate impression and type III dental stone on cast model properties...
June 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/28584479/gender-determination-by-odontometric-method
#17
Litha, H C Girish, Sanjay Murgod, J K Savita
CONTEXT: Gender determination is central in establishing personal identification from human skeletal remains. The study was conducted to find out the accuracy with which gender can be determined by odontometric methods. AIMS: To investigate the mesiodistal (MD) and buccolingual (BL) dimensions of all the teeth of permanent dentition to find new parameters to differentiate between male and female teeth and to assess whether each type of linear measurement can be used independently in odontometric sex differentiation...
January 2017: Journal of Forensic Dental Sciences
https://www.readbyqxmd.com/read/28574390/clinical-protocols-preparation-impression-and-bonding-of-all-ceramic-glass-based-disilicate-lithium-crowns-review-and-case-report
#18
D Vadachkoria, O Vadachkoria
Using contemporary materials and techniques, nowadays we can offer the patients much needed restorations while achieving the desired aesthetics. The maxillary incisors are supremely important in the appearance of a smile. By establishing proper size, contours, vitality, translucency and relationship with the surrounding teeth and soft tissue, we can help create the smile of their dream. In modern dentistry, there are two major recent developments - the dentine bonding and stronger all-ceramic crown systems...
April 2017: Georgian Medical News
https://www.readbyqxmd.com/read/28571280/a-comparative-evaluation-of-accuracy-of-the-dies-affected-by-tray-type-material-viscosity-and-pouring-sequence-of-dual-and-single-arch-impressions-an-in-vitro-study
#19
Poonam R Kulkarni, Rahul S Kulkarni, Rupal J Shah, Rahul Chhajlani, Bhuwan Saklecha, Kavita Maru
INTRODUCTION: The clinician's skill, impression techniques, and materials play a very important role in recording fine details in an impression for accuracy of fixed partial denture prosthesis. Impression of prepared teeth and of the opposing arch can be recorded simultaneously by dual-arch trays, while the full arch metal trays are used for impressions of prepared teeth in one arch. AIM: To measure and compare the accuracy of working dies made from impressions with metal and plastic dual arch trays and metal full arch trays, for two viscosities of impression material and by changing the sequence of pour of working and non-working sides...
April 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28569452/zirconia-reinforced-lithium-silicate-ceramic-a-2-year-follow-up-of-a-clinical-experience-with-anterior-crowns
#20
Guilherme de Siqueira Ferreira Anzaloni Saavedra, Flávia Pires Rodrigues, Marco Antonio Bottino
The aim of this manuscript is to describe 2-year follow-up of a clinical experience with a zirconia-reinforced lithium silicate ceramic for an anterior rehabilitation with single metal-free crowns. The maxillary-central incisor teeth crowns were made by zirconium-reinforced lithium silicate and covered with porcelain were obtained with a digital impression with the intra-oral scanner of the CEREC system as a basis for virtual design, as well as a laminate for the left lateral maxillary incisor, based on a "double scanning" technique...
March 2017: European Journal of Prosthodontics and Restorative Dentistry
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