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Vijay M Dhurandhare, Yuh-Sheng Wen, Sachin D Gawande, Pin-Hsuan Liao, Cheng-Chung Wang
We report a microwave-assisted intramolecular anomeric protection (iMAP) of glucosamine, which facilitates concise transformation of 1,6-anhydroglucosamine into 1,6-anhydrogalactosamine and 1,6-anhydroallosamine. The iMAP simultaneously obviates both the O1 and O6 protection, and the differentiation between O3 and O4 can be well-controlled by the N2 functionality because of the hydrogen bonding between N2 and O4. Epimerization of O4 afforded the galactosamine derivative and that of O3 yielded allosamine.
October 24, 2016: Journal of Organic Chemistry
Li Jin, Renjie Huo, Runping Guo, Fei Li, Da-Wei Wang, Ye Tian, Qingyuan Hu, Xiaoyong Wei, Zhanbing He, Yan Yan, Gang Liu
Electrostrictive effect has some advantages over the piezoelectric effect, including temperature-stability and hysteresis-free character. In the present work, we report the diffuse phase transitions and electrostrictive properties in lead-free Fe3+-doped 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 (BZT-0.5BCT) ferroelectric ceramics. The doping concentration was set from 0.25 mole % to 2 mole % . It is found that by introducing Fe3+ ion into BZT-0.5BCT, the temperature corresponding to permittivity maximum Tm was shifted toward lower temperature monotonically by 37 oC per mole % Fe3+ ion...
October 24, 2016: ACS Applied Materials & Interfaces
Aleksey B Smirnov, Serhii B Kryvyi, Sergii A Mulenko, Maria L Sadovnikova, Rada K Savkina, Nicolaie Stefan
Ultraviolet photons of KrF laser (248 nm) was used for the synthesis of nanometric films based on iron and chromium oxides (Fe2O3 - X (0 ≤ x ≤ 1) and Cr3 - X O3 - Y (0 ≤ x ≤ 2; 0 ≤ y ≤ 2)) with variable thickness, stoichiometry, and electrical properties. Film deposition was carried out on the silicon substrate Si < 100 > at the substrate's temperature T S = 293 K. X-ray diffraction and X-ray reflectometry analysis were used for the obtained structure characterization...
December 2016: Nanoscale Research Letters
B X Ke, D M He, H L Tan, H H Zeng, T Yang, B S Li, Y H Liang, L L Lu, J H Liang, Q Huang, C W Ke
Objective: To study the infection status, serotypes, drug resistance and molecular characteristics of Salmonella, Shigella, Vibrio parahemolyticus, enterotoxigenic Escherichia (E.) coli (ETEC), pathogenic E. coli (EPEC), Shiga Toxin producing E. coli (STEC) and Enteroinvasive E. coli (EIEC) collected from diarrhea patients in Guangdong. Methods: The strains of Salmonella, Shigella, V. parahemolyticus and 4 kinds of E. coli isolated from foodborne diseases surveillance during 2013-2014 were collected to conduct serotyping, drug resistance test and pulsed-field gel electrophoresis (PFGE)...
October 10, 2016: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
Benjamin J Frogley, L James Wright
Metalla-analogues of archetypal aromatic molecules are attracting ever increasing interest. Although metallabenzenes (which fall within this class) have been well studied, fused-ring metallabenzenes are rare and of the linear polycyclic metallaaromatic hydrocarbons, only metallanaphthalene is known. Herein we report the first metallaanthracene, [Ir(C13 H8 {CH2 CO2 Me-5})Cl(PPh3 )2 ]O3 SCF3 (5), which represents the next member of this series of polycyclic compounds. Structurally, 5 has a number of features in common with anthracene including fused-ring planarity and bond-length alternation...
October 20, 2016: Angewandte Chemie
Stefano Papazian, Eliezer Khaling, Christelle Bonnet, Steve Lassueur, Philippe Reymond, Thomas Moritz, James Blande, Benedicte Riber Albrectsen
Plants have evolved adaptive mechanisms that allow them to tolerate a continuous range of abiotic and biotic stressors. Tropospheric ozone (O3), a global anthropogenic pollutant, directly affects living organisms and ecosystems, including plant-herbivore interactions. In this study, we investigate the stress responses of wild black mustard (Brassica nigra) exposed consecutively to O3 and the specialist herbivore Pieris brassicae. Transcriptomics and metabolomics data were evaluated using multivariate, correlation, and network analyses for the O3 and herbivory responses...
October 6, 2016: Plant Physiology
Chen Xu, Hai-Dong Kan, Yan-Ni Fan, Ren-Jie Chen, Jiang-Hong Liu, Ya-Fei Li, Yao Zhang, Ai-Ling Ji, Tong-Jian Cai
The correlation between enteritis, a common digestive disease, and exposure to ambient air pollutants has not been examined in a comprehensive manner. The aim of this study was to determine whether an association between short-term air pollution exposure and outpatient visits for enteritis in Xi'an, China, occurred using a time-series investigation. Daily baseline data from January 1, 2013, to December 31, 2015, were obtained. The overdispersed Poisson generalized additive model was used to analyze the association between air pollutant levels and frequency of enteritis...
October 18, 2016: Journal of Toxicology and Environmental Health. Part A
Luiz Claudio Santos Thuler, Maria S Pombo-de-Oliveira
The WHO classification that defines subtypes of acute myeloid leukaemias (AMLs) is relatively unexplored at the population-based level. This study aimed to examine the frequency of acute promyelocytic leukaemia (APL or AML-M3) in Brazil. Data were extracted from 239 cancer centres (2001-2012) and categorized according to the International Classification of Diseases for Oncology (CID-O 3.0) and WHO classification (n = 9116). CID-O3 code 9866 identified 614 APL patients. AML not otherwise specified (NOS) was frequent, and the APL group represented the main subtype specified...
October 18, 2016: Annals of Hematology
Bin Zhang, Jinzhu Zhao, Rong Yang, Zhengmin Qian, Shengwen Liang, Bryan A Bassig, Yiming Zhang, Ke Hu, Shunqing Xu, Guanghui Dong, Tongzhang Zheng, Shaoping Yang
The objective of this study was to evaluate whether high levels of maternal exposure to O3, SO2, NO2, CO are related to increased risk of congenital heart defects (CHDs) in Wuhan, China. The study included mothers living in the central districts of Wuhan during pregnancy over the two-year period from June 10, 2011 to June 9, 2013. For each study participant, we assigned 1-month averages of O3, SO2, NO2 and CO exposure based on measurements obtained from the nearest exposure monitor to the living residence of mothers during their early pregnancy period...
October 18, 2016: Scientific Reports
H Calvete-Sogo, I González-Fernández, H García-Gómez, R Alonso, S Elvira, J Sanz, V Bermejo-Bermejo
Ozone (O3) critical levels (CLe) are still poorly developed for herbaceous vegetation. They are currently based on single species responses which do not reflect the multi-species nature of semi-natural vegetation communities. Also, the potential effects of other factors like the nitrogen (N) input are not considered in their derivation, making their use uncertain under natural conditions. Exposure- and dose-response relationships were derived from two open-top chamber experiments exposing a mixture of 6 representative annual Mediterranean pasture species growing in natural soil to 4 O3 fumigation levels and 3 N inputs...
October 14, 2016: Environmental Pollution
Sanja Pintarić, Ivan Zeljković, Gordana Pehnec, Višnja Nesek, Mislav Vrsalović, Hrvoje Pintarić
The aim of this study was to investigate whether nitrogen dioxide (NO2), ozone (O3), and certain meteorological conditions had an impact on cardiovascular disease (CVD)-related emergency department (ED) visits in the metropolitan area of Zagreb. This retrospective, ecological study included 20,228 patients with a cardiovascular disease as their primary diagnosis who were examined in the EDs of two Croatian University Hospitals, Sisters of Charity and Holy Spirit, in the study period July 2008-June 2010. The median of daily CVD-related ED visits during the study period was 28 and was the highest during winter...
September 1, 2016: Arhiv za Higijenu Rada i Toksikologiju
Wei-Yu Kong, Guo-An Wu, Kui-Yuan Wang, Teng-Fei Zhang, Yi-Feng Zou, Dan-Dan Wang, Lin-Bao Luo
A deep UV light photodetector is assembled by coating multilayer graphene on beta-gallium oxide (β-Ga2 O3 ) wafer. Optoelectronic analysis reveals that the heterojunction device is virtually blind to light illumination with wavelength longer than 280 nm, but is highly sensitive to 254 nm light with very good stability and reproducibility.
October 17, 2016: Advanced Materials
Nicole Ah Janssen, Gerard Hoek, Paul H Fischer, Alet H Wijga, Gerard Koppelman, Johan J de Jongste, Bert Brunekreef, Ulrike Gehring
No abstract text is available yet for this article.
September 28, 2016: Epidemiology
Michael I Jacobs, Bo Xu, Oleg Kostko, Nadja Heine, Musahid Ahmed, Kevin R Wilson
The heterogeneous reaction of ozone (O3) with 200 nm squalene nanoparticles is studied using near edge X-ray absorption fine structure (NEXAFS), ultraviolet (UPS) and X-ray photoelectron spectroscopy (XPS). Photoelectrons are detected from free nanoparticle beams using a velocity map imaging (VMI) spectrometer capable of detecting photoelectrons with up to 40 eV of kinetic energy. Heterogeneous kinetics are quantified using changes in the UPS, XPS and NEXAFS spectrum, yielding uptake coefficients for the decay of the double bonds in squalene of (3...
October 17, 2016: Journal of Physical Chemistry. A
Hui-Chen Cheng, Ren-Hao Pan, Huan-Jui Yeh, K Robert Lai, May-Yung Yen, Chien-Lung Chan, An-Guor Wang
PURPOSE: To investigate whether daily changes in ambient air pollution were associated with an increased risk of central retinal artery occlusion (CRAO). DESIGN: Retrospective population-based cohort study. PARTICIPANTS: We identified patients newly diagnosed with CRAO between 2001 and 2013 in a representative database of 1 000 000 patients that were randomly selected from all registered beneficiaries of the National Health Insurance program in Taiwan...
October 13, 2016: Ophthalmology
Juhwan Noh, Jungwoo Sohn, Jaelim Cho, Seong-Kyung Cho, Yoon Jung Choi, Changsoo Kim, Dong Chun Shin
OBJECTIVES: The goal of this study was to investigate the short-term effect of ambient air pollution on emergency department (ED) visits in Seoul for asthma according to patients' prior history of allergic diseases. METHODS: Data on ED visits from 2005 to 2009 were obtained from the Health Insurance Review and Assessment Service. To evaluate the risk of ED visits for asthma related to ambient air pollutants (carbon monoxide [CO], nitrogen dioxide [NO2], ozone [O3], sulfur dioxide [SO2], and particulate matter with an aerodynamic diameter <10 μm [PM10]), a generalized additive model with a Poisson distribution was used; a single-lag model and a cumulative-effect model (average concentration over the previous 1-7 days) were also explored...
September 2016: Journal of Preventive Medicine and Public Health, Yebang Ŭihakhoe Chi
Elizabeth A Ainsworth
Concentrations of ground-level ozone ([O3 ]) over much of the Earth's land surface have more than doubled since pre-industrial times. The air pollutant is highly variable over time and space, which makes it difficult to assess the average agronomic and economic impacts of the pollutant as well as to breed crops for O3 tolerance. Recent modeling efforts have improved quantitative understanding of the effects of current and future [O3 ] on global crop productivity, and experimental advances have improved understanding of the cellular O3 sensing, signaling and response mechanisms...
October 14, 2016: Plant Journal: for Cell and Molecular Biology
Viktor A Vorozhtcov, Valentina L Stolyarova, Sergey I Lopatin, Sergey M Shugurov, Andrey L Shilov, Vladimir F Sapega
RATIONALE: The Bi2 O3 -P2 O5 -SiO2 system possesses a number of valuable properties that may be of use for various practical applications, both for obtaining new materials e.g. optical fibers and for replacing systems based on toxic lead silicate. Information on vaporization processes and thermodynamic properties obtained in the present study will be useful for the development of synthesis methods and approaches for modeling the thermodynamic properties of materials based on this system...
October 14, 2016: Rapid Communications in Mass Spectrometry: RCM
Tikhon Vergentev, Iurii Bronwald, Dmitry Chernyshov, Semen Gorfman, Stephanie H M Ryding, Paul Thompson, Robert J Cernik
Synchrotron X-rays on the Swiss Norwegian Beamline and BM28 (XMaS) at the ESRF have been used to record the diffraction response of the PMN-PT relaxor piezoelectric 67% Pb(Mg1/3Nb2/3)O3-33% PbTiO3 as a function of externally applied electric field. A DC field in the range 0-18 kV cm(-1) was applied along the [001] pseudo-cubic direction using a specially designed sample cell for in situ single-crystal diffraction experiments. The cell allowed data to be collected on a Pilatus 2M area detector in a large volume of reciprocal space using transmission geometry...
October 1, 2016: Journal of Applied Crystallography
Yaojin Wang, Lijun Chen, Guoliang Yuan, Haosu Luo, Jiefang Li, D Viehland
The new generation of ternary Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 ferroelectric single crystals have potential applications in high power devices due to their surperior operational stability relative to the binary system. In this work, a reversible, large electric field induced strain of over 0.9% at room temperature, and in particular over 0.6% above 380 K was obtained. The polarization rotation path and the phase transition sequence of different compositions in these ternary systems have been determined with increasing electric field applied along [001] direction based on x-ray diffraction data...
October 13, 2016: Scientific Reports
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