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https://www.readbyqxmd.com/read/28749132/universal-ratiometric-photoelectrochemical-bioassay-with-target-nucleotide-transduction-amplification-and-electron-transfer-tunneling-distance-regulation-strategies-for-ultrasensitive-determination-of-microrna-in-cells
#1
Yingning Zheng, Wenbin Liang, Chengyi Xiong, Ying Zhuo, Yaqin Chai, Ruo Yuan
A universal ratiometric photoelectrochemical (PEC) bioassay, which could be readily expanded for untrasensitive determination of various targets in complex biological matrix, was established by coupling a target-nucleotide transduction-amplification with DNA nanomachine mediated electron-transfer tunneling distance regulation strategies. With the help of target-nucleotide transduction-amplification strategy, the one input target signal could be transducted to corresponding multiple output DNA signals by nucleotide specific recognition technology, simultaneously leading to an efficient signal amplification for target...
July 27, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28748701/mesoporous-zro2-nanoframes-for-biomass-upgrading
#2
Haiqing Wang, Hao Chen, Bing Ni, Kai Wang, Ting He, Yulong Wu, Xun Wang
The rational design and preparation of high-performance catalyst for biomass upgrading are of great significance and remain a great challenge. In this work, mesoporous ZrO2 nanoframe, hollow ring, sphere and core-shell nanostructures have been developed through a surfactant-free route for upgrading biomass acids into liquid alkane fuels. The obtained ZrO2 nanostructures possess well-defined hollow features, high surface areas and mesopores. The diversity of resultant ZrO2 nanostructures should be arising from the discrepant hydrolysis of two different ligands in zirconocene dichloride (Cp2ZrCl2) as zirconium precursor...
July 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28748298/comparison-of-sodium-hypochlorite-extrusion-by-five-irrigation-systems-using-an-artificial-root-socket-model-and-a-quantitative-chemical-method
#3
Adham A Azim, Hacer Aksel, M Margaret Jefferson, George T-J Huang
OBJECTIVES: This is to compare the volumes of irrigant apically extruded by five irrigation systems in an artificial socket model simulating clinical conditions. MATERIALS AND METHODS: Twenty extracted human single-rooted teeth were enlarged to size 40/04 and then embedded in silicone impression material. The root canal space was irrigated with nominal 3% sodium hypochlorite (NaOCl) using standard needle irrigation (SNI) with a 30-gauge notched needle, EndoActivator (EA), XP Endo Finisher (XP Endo), EndoVac (EV), and photon-induced photoacoustic streaming (PIPS)...
July 26, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28735788/effect-of-mineral-trioxide-aggregate-apical-plug-thickness-on-fracture-resistance-of-immature-teeth
#4
Ersan Çiçek, Neslihan Yılmaz, M Murat Koçak, Baran Can Sağlam, Sibel Koçak, Burcu Bilgin
INTRODUCTION: The aim of this study was to compare the fracture resistance of simulated immature teeth after using different thicknesses of mineral trioxide aggregate (MTA) apical plugs. METHODS: Fifty-two human maxillary anterior teeth were used. Five teeth were the positive control group; they were prepared using Peeso reamers to simulate immature teeth without any access cavity preparation. Access cavities of the 47 teeth were prepared, and the canals were instrumented with Peeso reamers...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28735730/impressic-acid-from-acanthopanax-koreanum-possesses-matrix-metalloproteinase-13-down-regulating-capacity-and-protects-cartilage-destruction
#5
Hyun Lim, Dong Suk Min, Han Eul Yun, Kil Tae Kim, Ya Nan Sun, Le Duc Dat, Young Ho Kim, Hyun Pyo Kim
ETHNOPHARMACOLOGICAL RELEVANCE: Acanthopanax koreanum (Araliaceae) has been used in traditional medicine for enhancing vitality, rheumatism, and bone-related pains. But its activity on cartilage protection has not been known yet. AIM OF THE STUDY: Matrix metalloproteinase (MMP)-13 has an important role in degrading cartilage materials under pathologic conditions such as arthritis. The present study was designed to find the inhibitory activity of impressic acid on MMP-13 expression and cartilage protective action...
July 20, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28734287/on-the-thermophysical-and-transport-properties-of-3-he-and-4-he-a-bubble-interaction-potential-versus-state-of-the-art
#6
Michael Chrysos, Henri Piel
Three keynote thermophysical and transport properties of (3)He and (4)He, namely, the second virial coefficient, the shear viscosity, and the thermal conductivity, are reported for the "extended Dirac bubble potential" (EDbp), a novel model for He-He [M. Chrysos, J. Chem. Phys. 146, 024106 (2017)]. Comparisons with the experiment as well as with potentials with a proven track record and with the oversimplified Dbp are being made in the range 0.1-500 K to analyze the performance of the EDbp, which is shown here to emerge as a promising analytic model for He-He...
July 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28733810/precision-of-guided-scanning-procedures-for-full-arch-digital-impressions-in-vivo
#7
Moritz Zimmermann, Christina Koller, Moritz Rumetsch, Andreas Ender, Albert Mehl
PURPOSE: System-specific scanning strategies have been shown to influence the accuracy of full-arch digital impressions. Special guided scanning procedures have been implemented for specific intraoral scanning systems with special regard to the digital orthodontic workflow. The aim of this study was to evaluate the precision of guided scanning procedures compared to conventional impression techniques in vivo. METHOD: Two intraoral scanning systems with implemented full-arch guided scanning procedures (Cerec Omnicam Ortho; Ormco Lythos) were included along with one conventional impression technique with irreversible hydrocolloid material (alginate)...
July 21, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/28719065/unconventional-route-to-uniform-hollow-semiconducting-nanoparticles-with-tailorable-dimensions-compositions-surface-chemistry-and-near-infrared-absorption
#8
Yanjie He, Xinchang Pang, Beibei Jiang, Chaowei Feng, Yeu Wei Harn, Yihuang Chen, Young Jun Yoon, Shuang Pan, Cheng-Hsin Lu, Yajing Chang, Mona Zebarjadi, Zhitao Kang, Naresh Thadhani, Juan Peng, Zhiqun Lin
Despite recent impressive advances in synthesizing lead chalcogenide solid nanoparticles, there are no demonstrations of lead chalcogenide hollow nanoparticles (HNPs) with controlled hollow diameter and shell thickness as current synthetic approaches for HNPs have inherent limitations associated with inability to precisely control the dimensions and restriction of applicable materials in scope. Herein, we report on an unconventional strategy for crafting uniform PbS and PbTe HNPs with tailorable size, surface chemistry, and near-IR absorption...
July 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28708995/evolution-of-the-human-nervous-system-function-structure-and-development
#9
REVIEW
André M M Sousa, Kyle A Meyer, Gabriel Santpere, Forrest O Gulden, Nenad Sestan
The nervous system-in particular, the brain and its cognitive abilities-is among humans' most distinctive and impressive attributes. How the nervous system has changed in the human lineage and how it differs from that of closely related primates is not well understood. Here, we consider recent comparative analyses of extant species that are uncovering new evidence for evolutionary changes in the size and the number of neurons in the human nervous system, as well as the cellular and molecular reorganization of its neural circuits...
July 13, 2017: Cell
https://www.readbyqxmd.com/read/28704059/tuning-li-ion-diffusion-in-%C3%AE-limn1-xfexpo4-nanocrystals-by-antisite-defects-and-embedded-%C3%AE-phase-for-advanced-li-ion-batteries
#10
Jiangtao Hu, Yinguo Xiao, Hanting Tang, Hongbin Wang, Ziqi Wang, Chaokun Liu, Hua Zeng, Qingzhen Huang, Yang Ren, Chongmin Wang, Wei Zhang, Feng Pan
Olivine-structured LiMn1-xFexPO4 has become a promising candidate for cathode materials owing to its higher working voltage of 4.1 V and thus larger energy density than that of LiFePO4, which has been used for electric vehicles batteries with the advantage of high safety but disadvantage of low energy density due to its lower working voltage of 3.4 V. One drawback of LiMn1-xFexPO4 electrode is its relatively low electronic and Li-ionic conductivity with Li-ion one-dimensional diffusion. Herein, olivine-structured α-LiMn0...
July 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28702604/how-to-efficiently-tune-the-biradicaloid-nature-of-acenes-by-chemical-doping-with-boron-and-nitrogen
#11
Max Pinheiro, Luiz F A Ferrão, Fernanda Bettanin, Adélia J A Aquino, Francisco B C Machado, Hans Lischka
Acenes are fascinating polyaromatic compounds that combine impressive semiconductor properties with an open-shell character by varying their molecular sizes. However, the increasing chemical instabilities related to their biradicaloid structures pose a great challenge for synthetic chemistry. Modifying the π-bond topology through chemical doping allows modulation of the electronic properties of graphene-related materials. In spite of the practical importance of these techniques, remarkably little is known about the basic question - the extent of the radical character created or quenched thereby...
July 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28697677/material-perception
#12
Roland W Fleming
Under typical viewing conditions, human observers effortlessly recognize materials and infer their physical, functional, and multisensory properties at a glance. Without touching materials, we can usually tell whether they would feel hard or soft, rough or smooth, wet or dry. We have vivid visual intuitions about how deformable materials like liquids or textiles respond to external forces and how surfaces like chrome, wax, or leather change appearance when formed into different shapes or viewed under different lighting...
July 11, 2017: Annual Review of Vision Science
https://www.readbyqxmd.com/read/28697209/improvement-of-a-digital-impression-with-conventional-materials-overcoming-intraoral-scanner-limitations
#13
Federico Mandelli, Francesco Ferrini, Giorgio Gastaldi, Enrico Gherlone, Marco Ferrari
Intraoral digital impression is a viable alternative to conventional impression techniques and has been proven to be even more accurate than conventional materials. Nevertheless, there are cases in which the rheologic properties of conventional materials can be helpful. This article describes a method to overcome an insufficient sulcus-depth reading of intraoral scanners in challenging cases.
July 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28696123/determining-the-true-optical-gap-in-a-high-performance-organic-photovoltaic-polymer-using-single-molecule-spectroscopy
#14
Gordon J Hedley, Florian Steiner, Jan Vogelsang, John M Lupton
Low-gap conjugated polymers have enabled an impressive increase in the efficiencies of organic solar cells, primarily due to their red absorption which allows harvesting of that part of the solar spectrum. Here, we report that the true optical gap of one prototypical material, PTB7, is in fact at significantly higher energy than has previously been reported, indicating that the red absorption utilized in these materials in solar cells is entirely due to chain aggregation. Using single-molecule spectroscopy we find that PL from isolated nanoscale aggregates consists of multiple independently emitting chromophores...
July 11, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28695232/resolving-the-chemical-structures-of-off-odorants-and-potentially-harmful-substances-in-toys-example-of-children-s-swords
#15
Philipp Denk, Cristina Velasco-Schön, Andrea Buettner
Most children's toys on the market are primarily made out of plastic and other complex composite materials. Consumer complaints about offensive odors or irritating effects associated with toy products have increased in recent years. One example is the strongly perceivable negative odor reported for a particular series of toy swords. Characterizing the presence of contaminants, including those that have the potential to be deleterious to health, in such products is a significant analytical challenge due to the high baseline abundance of chemical constituents of the materials used in the products...
July 11, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28694590/spinal-angiolipomas-a-puzzling-case-and-review-of-a-rare-entity
#16
REVIEW
Faris Shweikeh, Ajleeta Sangtani, Michael P Steinmetz, Peter Zahos, Bohdan Chopko
Patients with spinal epidural abscesses (SEAs) may have a variable presentation. Such an infection has a typical appearance on magnetic resonance imaging (MRI) and enhances with gadolinium. We present a case that was a diagnostic challenge where pre- and intra-operative findings resulted in conflicting impressions. The mimicker was a spinal angiolipoma (SAL). The authors then provide a thorough review of this rare spinal neoplasm. A 55-year-old man presented with back pain, paresis, paresthesia, and urinary retention...
April 2017: Journal of Craniovertebral Junction and Spine
https://www.readbyqxmd.com/read/28693613/cascading-training-the-trainers-in-ophthalmology-across-eastern-central-and-southern-africa
#17
Melanie C Corbett, Wanjiku Mathenge, Marcia Zondervan, Nick Astbury
BACKGROUND: The Royal College of Ophthalmologists (RCOphth) and the College of Ophthalmology of Eastern Central and Southern Africa (COECSA) are collaborating to cascade a Training the Trainers (TTT) Programme across the COECSA Region. Within the VISION 2020 Links Programme, it aims to develop a skilled motivated workforce who can deliver high quality eye care. It will train a lead, faculty member and facilitator in 8 countries, who can cascade the programme to local trainers. METHODS: In phase 1 (2013/14) two 3-day courses were run for 16/17 selected delegates, by 3 UK Faculty...
July 10, 2017: Globalization and Health
https://www.readbyqxmd.com/read/28691451/survey-results-of-currently-used-techniques-and-materials-by-dentists-for-fabrication-of-complete-removable-dental-prostheses
#18
A Meirowitz, R Nowotny Klein, D Lauritano, N Harel, J Block, S Matalon, F Carinci, Z Ormianer
The present study was based on the screening of procedures and materials used by dentists in constructing complete removable dental prostheses, considering their professional background and years of experience. Questions arose regarding differences and similarities within the local dental society, of which approximately 75% were trained in Europeans countries with differences in academic background, and compared to international dentistry. A questionnaire web site was used in order to anonymously collect answers to the survey by general practicing and specialist dentists...
April 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28691317/synthesis-and-characterization-of-a-novel-microporous-dihydroxyl-functionalized-triptycene-diamine-based-polyimide-for-natural-gas-membrane-separation
#19
Nasser Alaslai, Xiaohua Ma, Bader Ghanem, Yingge Wang, Fahd Alghunaimi, Ingo Pinnau
An intrinsically microporous polyimide is synthesized in m-cresol by a one-pot high-temperature condensation reaction of 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and newly designed 2,6 (7)-dihydroxy-3,7(6)-diaminotriptycene (DAT1-OH). The 6FDA-DAT1-OH polyimide is thermally stable up to 440 °C, shows excellent solubility in polar solvents, and has moderately high Brunauer-Teller-Emmett (BET) surface area of 160 m(2) g(-1) , as determined by nitrogen adsorption at -196 °C. Hydroxyl functionalization applied to the rigid 3D triptycene-based diamine building block results in a polyimide that exhibits moderate pure-gas CO2 permeability of 70 Barrer combined with high CO2 /CH4 selectivity of 50...
July 10, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28689913/a-technique-for-immediately-restoring-single-dental-implants-with-a-cad-cam-implant-supported-crown-milled-from-a-poly-methyl-methacrylate-block
#20
Periklis Proussaefs, Abdulaziz AlHelal
This technique is used when a single dental implant is placed. A stent made of autopolymerized acrylic resin was used to transfer the implant position to the laboratory. Once the implant position was transferred, the stone cast was scanned, and a computer-aided design and computer-aided manufacturing (CAD-CAM) interim implant-supported crown was milled from a poly(methyl methacrylate) (PMMA) block. A titanium insert, in contact with the implant platform and not the PMMA material, was used to support the crown...
July 7, 2017: Journal of Prosthetic Dentistry
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