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Pollyana Trigueiro, Silvia Pedetti, Baptiste Rigaud, Sebastien Balme, Jean-Marc Janot, Ieda M G Dos Santos, Régis Gougeon, Maria G Fonseca, Thomas Georgelin, Maguy Jaber
Wine chemistry inspires and challenges with its complexity and intriguing composition. In this context, the composites based on the use of a model protein, a polyphenol of interest and montmorillonite in a model hydroalcoholic solution have been studied. A set of experimental characterization techniques highlighted the interactions between the organic and the inorganic parts in the composite. The amount of the organic part was determined by ultraviolet-visible (UV-VIS) and thermal analysis. X-ray diffraction (XRD) and transmission electronic microscopy (TEM) informed about the stacking/exfoliation of the layers in the composites...
March 6, 2018: Colloids and Surfaces. B, Biointerfaces
Audrey M Bernstein, Robert Ritch, J Mario Wolosin
Exfoliation syndrome (XFS) is an age-related disease involving the deposition of aggregated fibrillar material (XFM) at extracellular matrices in tissues that synthesize elastic fibers. Its main morbidity is in the eye, where XFM accumulations form on the surface of the ciliary body, iris and lens. Exfoliation glaucoma (XFG) occurs in a high proportion of persons with XFS and can be a rapidly progressing disease. Worldwide, XFG accounts for about 25% of open-angle glaucoma cases. XFS and XFG show a sharp age-dependence, similarly to the many age-related diseases classified as aggregopathies...
March 15, 2018: Journal of Glaucoma
Qin Xiang, Yuping Liu, Xuefeng Zou, Bingbing Hu, Yujie Qiang, Danmei Yu, Wei Yin, Changguo Chen
In this work, g-C3N4@GO gel-like hybrid is obtained by assembling intentionally exfoliated g-C3N4 sheets on graphene oxide (GO) sheets under a hydrothermal condition. A specific N-doping process is firstly designed by heating the g-C3N4@GO interlaced hybrid in vacuum to form nitrogen-doped graphene nanosheets (NGS) with high level of pyridinic-N (56.0%) and edge-rich defect structure. The prepared NGS exhibited a great electrocatalysis for oxygen reduction reaction (ORR) in terms of the activity, durability, methanol tolerance, and the reaction kinetics...
March 16, 2018: ACS Applied Materials & Interfaces
Seiji Obata, Minoru Sato, Keishi Akada, Koichiro Saiki
A high throughput synthesis method of graphene has been required for a long time to apply graphene to industrial applications. Of the various synthesis methods, the chemical exfoliation of graphite via graphene oxide (GO) is advantageous as far as productivity is concerned; however, the quality of the graphene produced by this method is far inferior to that synthesized by other methods, such as chemical vapor deposition on metals. Developing an effective reduction and restoration method for GO on dielectric substrates has been therefore a key issue...
March 16, 2018: Nanotechnology
Hao Huang, Xiaohui Ren, Zhongjun Li, Huide Wang, Zongyu Huang, Hui Qiao, Pinghua Tang, Jinlai Zhao, Weiyuan Liang, Yanqi Ge, Jie Liu, Jianqing Li, Xiang Qi, Han Zhang
Two dimensional (2D) Bi nano-sheets had been employed to fabricate electrodes for broadband photo-detection. A series of characterization techniques including SEM and HRTEM verify that Bi nanosheets with intact lamellar structure have been obtained after facile liquid phase exfoliation. In the meanwhile, UV-Vis and Raman spectra are also carried out and confirm the inherent optical and physical properties of Bi nanosheets. Inherited from the topological characteristics of Bi bulk counterpart, the resultant Bi nanosheet-based photo-detector exhibits preferable photo-response activity as well as environmental robustness...
March 15, 2018: Nanotechnology
Lintao Peng, Spencer A Wells, Christopher R Ryder, Mark C Hersam, Matthew Grayson
The crystal orientation of an exfoliated black phosphorous flake is determined by purely electrical means. A sequence of three resistance measurements on an arbitrarily shaped flake with five contacts determines the three independent components of the anisotropic in-plane resistivity tensor, thereby revealing the crystal axes. The resistivity anisotropy ratio decreases linearly with increasing temperature T and carrier density reaching a maximum ratio of 3.0 at low temperatures and densities, while mobility indicates impurity scattering at low T and acoustic phonon scattering at high T...
February 23, 2018: Physical Review Letters
Shi-Hao Zhang, Bang-Gui Liu
We propose through first-principles investigation that the GaTeCl monolayer is an excellent two-dimensional (2D) multiferroic with giant mechanical anisotropy. The calculated phonon spectrum, molecular dynamic simulations, and elastic moduli confirm its dynamic and mechanical stability, and our cleavage energy analysis shows that exfoliating one GaTeCl monolayer from the existing GaTeCl bulk is feasible. The calculated in-plane ferroelectric polarization reaches 578 pC m-1 . The energy barriers per formula unit of the ferroelastic 90° rotational and ferroelectric reversal transitions are 476 meV and 754 meV, respectively, being the greatest in the 2D multiferroics family so far...
March 15, 2018: Nanoscale
Zhi Chen, Dangui Yin, Ming Zhang
Sandwich-like MoS2 @SnO2 @C nanosheeets are prepared by facile hydrothermal reactions. SnO2 nanosheets can attach to exfoliated MoS2 nanosheets to prevent restacking of adjacent MoS2 nanosheets, and carbon transformed from polyvinylpyrrolidone is coated on MoS2 @SnO2 , forming a sandwich structure to maintain cycling stability. As an anode for sodium-ion batteries, the electrode greatly deliverers a high initial discharge specific capacity of 530 mA h g-1 and maintains at 396 mA h g-1 after 150 cycles at 0...
March 15, 2018: Small
Érica Prado Domingues, Guilherme Gomes Silva, Andrei Barbassa Oliveira, Lorrany Marins Mota, Vanessa Santana Vieira Santos, Edimar Olegário de Campos, Boscolli Barbosa Pereira
Workers in several occupational environments are exposed to pollutants. Street vendors, for example, typically work in a high-traffic urban environment and are exposed to numerous air pollutants, including genotoxic substances emitted by motor vehicles. This study examined the genotoxic effects of exposure to air pollution. We conducted cytological analyses to assess frequencies of micronucleated (MN) and binucleated (BN) cells in a sample of exfoliated oral mucosa cells. We compared street vendors and control subjects in the city of Uberlândia, Minas Gerais, Brazil, and also collected quantitative information on exposure conditions of all test subjects, including concentrations of particulate matter...
March 14, 2018: Environmental Monitoring and Assessment
Ling Xu, Jun Xu, Zheng Hu, Baohua Yang, Lifeng Wang, Xiao Lin, Ziyin Xia, Zhiling Zhang, Yunheng Zhu
DNA methylation is associated with tumorigenesis and may act as a potential biomarker for detecting cervical cancer. The aim of the present study was to explore the methylation status of the paired box gene 1 (PAX1) and the LIM homeobox transcription factor 1 α (LMX1A) gene in a spectrum of cervical lesions in an Eastern Chinese population. This single-center study involved 121 patients who were divided into normal cervix (NC; n=28), low-grade squamous intraepithelial lesion (LSIL; n=32), high-grade squamous intraepithelial lesion (HSIL; n=34) and cervical squamous cell carcinoma (CSCC; n=27) groups, according to biopsy results...
April 2018: Oncology Letters
Lu Wang, Bo Jiang, Per Erik Vullum, Ann Mari Svensson, Andreas Erbe, Sverre M Selbach, Huailiang Xu, Fride Vullum-Bruer
A rechargeable Mg battery where the capacity mainly originates from reversible reactions occurring at the electrode/electrolyte interface efficiently avoids the challenge of sluggish Mg intercalation encountered in conventional Mg batteries. The interfacial reactions in a cell based on microwave exfoliated graphite oxide (MEGO) as the cathode, and all phenyl complex (APC) as electrolyte, are by quantitative kinetics analysis identified as a combination of diffusion-controlled reactions involving ether solvents (esols) and capacitive processes...
March 14, 2018: ACS Nano
Fang Zhang, W Mx, Zhengping Wang, Kezhen Han, Xiaojuan Liu, Xinguang Xu
As the cousins of graphene, i.e. same group IVA element, the nonlinear absorption properties of silicene nanosheets were rarely studied. In this paper, we successfully exfoliated the two-dimensional silicene nanosheets from bulk silicon crystal using liquid phase exfoliation method. The nonlinear absorption properties of silicene nanosheets were systemically investigated for the first time, as we have known. Silicene performed exciting saturable absorption and two photon absorption behavior. The lower saturable intensity and larger two photon absorption coefficient at 532 nm excitation indicates that silicene has potential application in ultrafast lasers and optical limiting devices, especially in visible waveband...
March 14, 2018: Nanotechnology
Vidya Kochat, Atanu Samanta, Yuan Zhang, Sanjit Bhowmick, Praveena Manimunda, Syed Asif S Asif, Anthony S Stender, Robert Vajtai, Abhishek K Singh, Chandra S Tiwary, Pulickel M Ajayan
Among the large number of promising two-dimensional (2D) atomic layer crystals, true metallic layers are rare. Using combined theoretical and experimental approaches, we report on the stability and successful exfoliation of atomically thin "gallenene" sheets on a silicon substrate, which has two distinct atomic arrangements along crystallographic twin directions of the parent α-gallium. With a weak interface between solid and molten phases of gallium, a solid-melt interface exfoliation technique is developed to extract these layers...
March 2018: Science Advances
Saki Hirofuji, Yuta Hirofuji, Hiroki Kato, Keiji Masuda, Haruyoshi Yamaza, Hiroshi Sato, Fumiko Takayama, Michiko Torio, Yasunari Sakai, Shouichi Ohga, Tomoaki Taguchi, Kazuaki Nonaka
Rett syndrome is an X-linked neurodevelopmental disorder associated with psychomotor impairments, autonomic dysfunctions and autism. Patients with Rett syndrome have loss-of-function mutations in MECP2, the gene encoding methyl-CpG-binding protein 2 (MeCP2). Abnormal biogenic amine signaling and mitochondrial function have been found in patients with Rett syndrome; however, few studies have analyzed the association between these factors. This study investigated the functional relationships between mitochondria and the neuronal differentiation of the MeCP2-deficient stem cells from the exfoliated deciduous teeth of a child with Rett syndrome...
March 10, 2018: Biochemical and Biophysical Research Communications
Gourhari Chakraborty, Ravi Babu Valapa, G Pugazhenthi, Vimal Katiyar
In order to overcome the challenges that underlies in dispersion of exfoliated graphene (GR) into poly lactic acid (PLA) matrix by extrusion, a versatile approach is used in this work, where uniform coating of GR over PLA is carried out prior to extrusion of PLA. Effect of melt processing on different graphene loaded composites (PLA-M-0.05GR, PLA-M-0.2GR) is studied. Investigation on the morphology, thermal stability, crystallization property, surface wettability, mechanical property, and dynamic mechanical property of composites are performed...
March 10, 2018: International Journal of Biological Macromolecules
Huihui Wang, Qi Zhong, Tianshu Yang, Ying Qi, Mengchen Fu, Xi Yang, Lu Qiao, Qi Ling, Shangfeng Liu, Yumei Zhao
Dental pulp stem cells (DPSCs) and stem cells from human exfoliated deciduous teeth (SHED) are types of human dental tissue‑derived mesenchymal stem cells (MSCs). These cells possess a capacity for self‑renewal, multilineage differentiation potential and immunomodulatory functions. Previous studies have reported that DPSCs and SHED may be beneficial in regenerative treatments and immunotherapy. The substantial expansion of cells in vitro is a prerequisite to obtaining adequate cell numbers required for cell‑based therapy...
March 9, 2018: Molecular Medicine Reports
Meng Shen
No abstract text is available yet for this article.
February 28, 2018: ACS Central Science
Peng Chen, Zhengwei Zhang, Xidong Duan, Xiangfeng Duan
Two-dimensional atomic crystals (2DACs) have attracted intense recent interest. With a nearly perfect crystalline structure and dangling-bond free surface, these atomically thin materials have emerged as a new material platform for fundamental materials science and diverse technology opportunities at the limit of single atom thickness. Over the past decade, a wide range of 2DACs has been prepared by mechanically exfoliating bulk layered crystals, which has fueled the rapid progress of the entire field in terms of fundamental physics and basic device demonstrations...
March 12, 2018: Chemical Society Reviews
Xu-Man Chen, Yong Chen, Lu Liang, Qiu-Jun Liu, Yu Liu
Circularly polarized luminescence (CPL) induced by host-guest complexation remains a challenge in supramolecular chemistry. Herein, a couple of CPL-silent enantiomeric guest binaphthylbis(4,4'-bipyridinium) salts can emit obvious CPL in the presence of cucurbit[8]uril in aqueous media, due to the restriction of molecular rotation limitation effect. Such CPL can be reversibly adjusted by the addition of acid and base. Furthermore, the resultant supramolecular systems can interact with DNA, accompanied by the morphological conversion from branched supramolecular nanowires to exfoliated nanowires, which can enable to the exploration of such supramolecular systems as DNA markers by CPL signals...
March 12, 2018: Macromolecular Rapid Communications
Saumita Ghosh Biswal, Rajesh Datt Mehta
Background: The diagnosis of cutaneous adversities in the cancer patient is especially difficult, given the complexity of their illness and combination protocols used for the treatment. The present study was undertaken to know the spectrum of cutaneous adversities in patients undergoing chemotherapy and the drug(s) most commonly associated with it. Materials and Methods: A total of 1000 patients with malignancies under chemotherapy in the oncology ward and outpatient department were screened in this observational study from January 2013 to February 2015...
January 2018: Indian Journal of Dermatology
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