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Golnoush Zamiri, Samira Bagheri
Zero-dimensional graphene quantum dots (GQDs) consist of single- or few-layer graphene with a size less than 20 nm and stand for a new type of QDs with unique properties combining the graphene nature and size-resulted quantum effects. GQDs possess unique optical and electronic properties, and in particular possess a band-gap less than 2.0 eV because of quantum confinement and edge effects. In this study, we investigated the performance of DSSCs using different thicknesses of ZnO nanoparticles as a photo-anode and GQDs as a green photosensitizer...
October 7, 2017: Journal of Colloid and Interface Science
Joel S Miller, Eric Campbell, Brandon Dick, Arnold Rheingold, Chuang Zhang, Xiaojie Liu, Zeev Vardeny
Photovoltaic Perovskites, most notably methylammonium lead triiodide, (NH3Me)PbI3, have recently attracted considerable attention, and based upon the 'Goldschmidt Tolerance Factor' hydrazinium should be able to occupy the same cation site as methylammonium. The reaction of N2H5+I- with PbI2 in DMF results in three types of yellow crystals; hexagonal, needle-like, and rod-like, whose structures were determined at 100 K. The hexagonal [P63/m: a = 10.8906(10) Å; b = 37.845(5) Å] crystals possess isolated face sharing octahedral [Pb2I9]5-, [PbI6]4-, and I- ions...
October 13, 2017: Chemistry: a European Journal
Erin Nicholson, Pedro A Piedra
No abstract text is available yet for this article.
September 23, 2017: Journal of Infectious Diseases
Nguyen Thi Thanh Thao, Celeste Donato, Vu Thi Huyen Trang, Nguyen Trung Kien, Ph M Mai Thuy Trang, Tran Quoc Khanh, Dang Thi Nguyet, October Sessions, Hoang Quoc Cuong, Phan Trong Lan, Vu Thi Que Huong, H Rogier van Doorn, Vijaykrishna Dhanasekaran
Background: Enterovirus A71 (EV-A71) is the major cause of severe hand, foot and mouth disease and viral encephalitis in children across the Asia-Pacific region, including in Vietnam which has experienced a high burden of disease in recent years. Multiple subgenogroups (C1, C4, C5 and B5) concurrently circulate in the region with a large variation in epidemic severity. The relative differences in their evolution and epidemiology were examined within Vietnam and globally. Methods: A total of 752 VP1 gene sequences were analysed (413 generated in this study combined with 339 obtained from GenBank), collected from patients in 36 provinces in Vietnam during 2003-2013 along with epidemiological metadata...
September 23, 2017: Journal of Infectious Diseases
Pin Fee Chong, Ryutaro Kira, Harushi Mori, Akihisa Okumura, Hiroyuki Torisu, Sawa Yasumoto, Hiroyuki Shimizu, Tsuguto Fujimoto, Nozomu Hanaoka, Susumu Kusunoki, Toshiyuki Takahashi, Kazunori Oishi, Keiko Tanaka-Taya
Backgroud: Acute flaccid myelitis (AFM) is an acute flaccid paralysis (AFP) syndrome with spinal motor neuron involvement of unknown etiology. We investigated the characteristics and prognostic factors of AFM clusters coincident with an enterovirus D68 (EV-D68) outbreak in Japan during autumn 2015. Methods: An AFM case series study was conducted following a nationwide survey from August to December 2015. Radiographic and neurophysiologic data were subjected to centralized review, and virology studies were conducted for available specimens...
October 6, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
Petr V Borisyuk, Sergey P Derevyashkin, Ksenia Y Khabarova, Nikolay N Kolachevsky, Yury Y Lebedinsky, Sergey S Poteshin, Alexey A Sysoev, Evgeny V Tkalya, Dmitry O Tregubov, Viktor I Troyan, Oleg S Vasiliev, Valery P Yakovlev, Valery I Yudin
We describe an original multisectional quadrupole ion trap aimed to realize nuclear frequency standard based on the unique isomer transition in thorium nucleus. It is shown that the system effectively operates on Th(+), Th(2+) and Th(3+) ions produced by laser ablation of metallic thorium-232 target. Laser intensity used for ablation is about 6 GW/cm(2). Via applying a bias potential to every control voltage including the RF one, we are able not only to manipulate ions within the energy range as wide as 1-500 eV but to specially adjust trap potentials in order to work mainly with ions that belong to energy distribution maximum and therefore to effectively enhance the number of trapped ions...
August 2017: European Journal of Mass Spectrometry
Yang Fan, Hua-Min Li, Rui-Huan Duan, Hai-Ting Lu, Jun-Tao Cao, Guo-Dong Zou, Qiang-Shan Jing
The metal-to-core charge transfer (MCCT) transition in sensitized titanium-oxo clusters is an important process for photoinduced electron injection in photovoltaic conversion. This process resembles most closely the Type II photoinjection in dye-sensitized solar cells. Herein we report the synthesis and photophysical and photoelectrochemical (PEC) properties of the phosphonate-stabilized titanium-oxo clusters containing the ferrocenecarboxylate ligands. These ferrocene-containing clusters exhibit intense visible absorption extended up to 600 nm along with low optical band gaps of ∼2...
October 13, 2017: Inorganic Chemistry
Pi A B Haase, Michal Repisky, Stanislav Komorovsky, Jesper Bendix, Stephan P A Sauer
The performance of relativistic density functional theory (DFT) methods has been investigated for the calculation of the recently measured hyperfine coupling constants of Re IV and Ir IV in their hexafluorido ions, [ReF6]2- and [IrF6]2-. Three relativistic methods have been employed at the DFT level of theory: the 2-component zeroth order regular approximation (ZORA) method treating the spin-orbit coupling either variationally (EV ZORA) or as a perturbation (LR ZORA) and the 4-component Dirac-Kohn-Sham (DKS) method...
October 12, 2017: Chemistry: a European Journal
Xukai Luo, Guangzhao Wang, Yuhong Huang, Biao Wang, Hongkuan Yuan, Hong Chen
In this work, we employ hybrid density functional theory calculations to design a two-dimensional layered CdS/C2N heterostructure for visible light photocatalytic water splitting to produce hydrogen. The calculation results show that the conduction band minimum (CBM) and the valence band maximum (VBM) of C2N monolayers are lower than those of CdS nanosheets by about 0.76 eV and 0.44 eV, respectively. The type-II band alignment, density of states, Bader charge analysis, and charge density difference of the CdS/C2N heterostructure indicate that the photogenerated electrons migrate from the CdS monolayer to the C2N monolayer, favoring the separation and transfer of photogenerated charge carriers, which restrains the recombination of photogenerated carriers and enhances the photocatalytic efficiency...
October 13, 2017: Physical Chemistry Chemical Physics: PCCP
Fu-Ying Lee, Zong-Zhe Wu, Li-Chi Kao, Feng-Mei Chang, Sheng-Wen Chen, Shiu-Ko JangJian, Hui-Yu Cheng, Wei-Liang Chen, Yu-Ming Chang, Kuang Yao Lo
Further scale down the dimension of silicon-based integrated circuit is a crucial trend in semiconductor fabrication. One of the most critical issues in the nano-device fabrication is to confirm the atomic structure evolution of the ultrathin shallow junction. In this report, UV Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray absorption near edge structure (XANES) and reflective second harmonic generation (RSHG) are utilized to monitor the pulse laser induced atomic structure evolution of ultralow-energy high-dose Boron implanted Si(110) at room and cold substrate temperature...
October 12, 2017: Scientific Reports
Recep Bayraktar, Katrien Van Roosbroeck, George A Calin
Mammalian cells can release different types of extracellular vesicles (EVs), including exosomes, microvesicles, and apoptotic bodies. Accumulating evidence suggests that EVs play a role in cell-to-cell communication within the tumor microenvironment. EVs' components, such as proteins, non-coding RNAs [microRNAs (miRNAs) and long non-coding RNAs (lncRNAs)], messenger RNAs (mRNAs), DNA, and lipids, can mediate paracrine signaling in the tumor microenvironment. Recently, miRNAs encapsulated in secreted EVs have been identified in the extracellular space...
October 11, 2017: Molecular Oncology
Jill-Sandra Schoefinius, Bärbel Brunswig-Spickenheier, Thomas Speiseder, Sabrina Krebs, Ursula Just, Claudia Lange
The therapeutic effect of mesenchymal stromal cells (MSC) in tissue regeneration is based mainly on the secretion of bioactive molecules. Here, we report that the radioprotective effect of mouse bone marrow derived MSC (mMSC) can be attributed to extracellular vesicles (EV) released from mMSC. The transplantation of mMSC-derived EV into lethally irradiated mice resulted in long-term survival but no improvement in short-term reconstitution of the recipients. Importantly, the radiation rescue was efficient without additional hematopoietic support...
October 11, 2017: Stem Cells
Fang Wang, Tian Hongwei, Ling Li, Klaus Piontek, Masazumi Sakaguchi, Florin M Selaru
Hepatocellular Cancer (HCC) is a common and deadly cancer. Most cases of HCC arise in a cirrhotic/fibrotic liver, raising the possibility that the environment plays a paramount role in cancer genesis. Previous studies from our group and others have shown that, in desmoplastic cancers, there is a rich intercellular communication between activated, cancer-associated fibroblasts (CAF) and cancer cells. Moreover, Extracellular Vesicles (EVs), or exosomes, were identified asan important arm of this intercellular communication platform...
October 10, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
Ziru Niu, Ronald T K Pang, Weimin Liu, Qian Li, Ranran Cheng, William S B Yeung
Extracellular vesicles (EVs) are membrane-bound vesicles released by cells and act as media for transfer of proteins, small RNAs and mRNAs to distant sites. They can be isolated by different methods. However, the biological activities of the purified EVs have seldom been studied. In this study, we compared the use of ultracentrifugation (UC), ultra-filtration (UF), polymer-based precipitation (PBP), and PBP with size-based purification (PBP+SP) for isolation of EVs from human endometrial cells and mouse uterine luminal fluid (ULF)...
2017: PloS One
Waled M El-Senousy, Adel Abdel-Moneim, Mahmoud Abdel-Latif, Mohamed H El-Hefnawy, Rehab G Khalil
This study proposed to detect the enterovirus (EV) infection in children with type 1 diabetes mellitus (T1D) and to assess the role of insufficiently treated water and sewage as sources of viral spreading. Three hundred and eighty-two serum specimens of children with T1D, one hundred serum specimens of children who did not suffer from T1D as control, and forty-eight water and sewage samples were screened for EV RNA using nested RT-PCR. The number of genome copies and infectious units of EVs in raw and treated sewage and water samples were investigated using real-time (RT)-PCR and plaque assay, respectively...
October 11, 2017: Food and Environmental Virology
Tingling Ke, Hongguang Guo, Yongli Zhang, Yang Liu
The residuals of hexavalent chromium in the aquatic environment have raised much concern for water decontamination. In this study, BiVO4-Fe3O4 was synthesized using a solvothermal method and adopted as a photoreduction catalyst to removal of Cr(VI) in water under visible light irradiation. The physical and chemical properties of BiVO4-Fe3O4 were characterized by UV-vis-DRS, SEM, XRD, FTIR, and BET. The results demonstrated that the band gap for the obtained material is 1.74 eV with an average size of 15 nm and a specific surface area of 55...
October 11, 2017: Environmental Science and Pollution Research International
Xiuwen Wang, Ying Xie, Buhe Bateer, Kai Pan, Yanqing Jiao, Ni Xiong, Song Wang, Honggang Fu
Cu2ZnSnS4 (CZTS) and Cu2ZnSn(S, Se)4 (CZTSSe) as promising photovoltaic materials have drawn much attention because they are environmentally benign and earth abundant elements. In this work, the monodispersed, low-cost Cu2ZnSnS4 nanocrystals with small size have been controllably synthesized via a wet chemical routine. And CZTSSe could be easily prepared after selenization of CZTS. When they are employed as counter electrodes (CEs) for dye-sensitized solar cells (DSSCs), the power conversion efficiency (PCE) has been improved from 3...
October 11, 2017: ACS Applied Materials & Interfaces
Song Ling Wang, Xin Luo, Xiong Zhou, Ye Zhu, Xiao Chi, Wei Chen, Kai Wu, Zheng Liu, Su Ying Quek, Guoqin Xu
The synthesis of free-standing two-dimensional titania (2-D TiO2) with a reduced band gap presents complex chal-lenges to synthetic chemists. Here, we report a free-standing 2-D TiO2 sheet synthesized via a one-step solvothermal methodology, with a measured optical onset at ~ 1.84 eV. Using first principles calculations in combination with experiment, we propose that the as-formed 2-D TiO2 sheets are layers of the lepidocrocite TiO2 structure, but with large non-uniform strains consistent with its crumpled morphology...
October 11, 2017: Journal of the American Chemical Society
Jiatao Liu, Huisheng Lyu, Yifei Chen, Guiming Li, Haoxi Jiang, Minhua Zhang
Developing low-cost and high-efficiency non-noble metal catalysts is beneficial for industrially massive synthesis of ethanol from acetic acid, which can be obtained from renewable biomass. Understanding the detailed mechanism of the reaction from a molecular level provides insights that can be used to tailor catalysts to improve their performance. In this study, alternative mechanisms for ethanol synthesis from acetic acid hydrogenation over Cu2In(100) have been investigated using periodic density functional theory (DFT) calculations...
October 10, 2017: Physical Chemistry Chemical Physics: PCCP
Yi Wang, Peter Zavalij, Bryan Eichhorn
The norbornadiene-like bimetallic dimer [(ZnSb6)2](4-) anion (1) was prepared by direct extraction from a ternary alloy with nominal composition "K6ZnSb5" in ethylenediamine/toluene/2,2,2-crypt solutions. The structure represents a new type for coupled norbornadiene subunits, however, distortions around the Zn(2+) ions degrade the overall symmetry. The Zn(2+) ions achieve a 16e(-) configuration and reside in near perfect ZnSb3 triangular coordination environments. DFT calculations reveal a 2.35 eV HOMO-LUMO gap and suggest covalent bonding between the Zn and Sb atoms...
October 10, 2017: Chemical Communications: Chem Comm
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