44 research outputs found

    Scatter Plot and Pearson's Correlation Coefficient Matrix for comparisons among CDC Surveillance for influenza and Google Trends data, from 2008 to 2011.

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    <p>The upper panel above the diagonal shows Pearson's Correlation Coefficients with their confidence interval between CDC surveillance data and Google Trends data. The lower panel below the diagonal gives their scatter plots.</p

    High-Pressure Synthesis, Crystal Structure, and Magnetic Properties of Sr<sub>2</sub>MnO<sub>3</sub>F: A New Member of Layered Perovskite Oxyfluorides

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    We have successfully synthesized Sr<sub>2</sub>MnO<sub>3</sub>F, a new layered perovskite oxyfluoride with a <i>n</i> = 1 Ruddlesden–Popper-type structure using a high-pressure, high-temperature method. Structural refinements against synchrotron X-ray diffraction data collected from manganese oxyfluoride demonstrated that it crystallizes in a tetragonal cell with the space group <i>I</i>4/<i>mmm</i>, in which the Mn cation is located at the octahedral center position. This is in stark contrast to the related oxyhalides that have square-pyramidal coordination such as Sr<sub>2</sub>MO<sub>3</sub>X (M = Fe, Co, Ni; X = F, Cl) and Sr<sub>2</sub>MnO<sub>3</sub>Cl. There was no evidence of O/F site order, but close inspection of the anion environment centered at the Mn cation on the basis of bond-valence-sum calculation suggested preferential occupation of the apical sites by the F ion with one oxide ion in a random manner. Magnetic susceptibility and heat capacity measurements revealed an antiferromagnetic ordering at 133 K (=<i>T</i><sub>N</sub>), which is much higher than that of the chloride analogue with corrugated MnO<sub>2</sub> planes (<i>T</i><sub>N</sub> = 80 K)

    Organophosphorus Flame Retardants and Plasticizers in Airborne Particles over the Northern Pacific and Indian Ocean toward the Polar Regions: Evidence for Global Occurrence

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    Organophosphorus compounds (OPs) being applied as flame retardants and plasticizers were investigated in airborne particles over the Pacific, Indian, Arctic, and Southern Ocean. Samples taken during two polar expeditions in 2010/11, one from East Asia to the high Arctic (CHINARE 4) and another from East Asia toward the Indian Ocean to the Antarctic (CHINARE 27), were analyzed for three halogenated OPs (tris­(2-chloroethyl) phosphate (TCEP), tris­(2-chloroisopropyl) phosphate (TCPP) and tris­(1,3-dichloro-2-isopropyl) phosphate (TDCP)), four alkylated OPs (tri-<i>n</i>-butyl phosphate (T<i>n</i>BP), tri-<i>iso</i>-butyl phosphate (T<i>i</i>BP), tris­(2-butoxyethyl)­phosphate (TBEP), and tris­(2-ethylhexyl) phosphate (TEHP)), and triphenyl phosphate (TPhP). The sum of the eight investigated OPs ranged from 230 to 2900 pg m<sup>–3</sup> and from 120 to 1700 pg m<sup>–3</sup> during CHINARE 4 and CHINARE 27, respectively. TCEP and TCPP were the predominating compounds, both over the Asian seas as well as in the polar regions, with concentrations from 19 to 2000 pg m<sup>–3</sup> and 22 to 620 pg m<sup>–3</sup>, respectively. Elevated concentrations were observed in proximity to the Asian continent enhanced by continental air masses. They decreased sharply toward the open oceans where they remained relatively stable. This paper shows the first occurrence of OPs over the global oceans proving that they undergo long-range atmospheric transport over the global oceans toward the Arctic and Antarctica

    DataSheet_1_Spatial distribution and diversity of the heterotrophic flagellates in the Cosmonaut Sea, Antarctic.docx

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    As predators of bacteria and viruses and as food sources for microzooplankton, heterotrophic flagellates (HFs) play an important role in the marine micro-food web. Based on the global climate change’s impact on marine ecosystems, particularly sea ice melting, we analyzed the community composition and diversity of heterotrophic flagellates, focusing on the Antarctic Cosmonaut Sea. During the 36th China Antarctic research expedition (2019-2020), we collected seawater samples, subsequently analyzing HFs through IlluminaMiSeq2000 sequencing to assess community composition and diversity. Notable variations in HFs abundance were observed between the western and eastern sectors of the Cosmonaut Sea, with a distinct concentration at a 100-meter water depth. Different zones exhibited diverse indicators and dominants taxa influenced by local ocean currents. Both the northern Antarctic Peninsula and the western Cosmonaut Sea, where the Weddell Eddy and Antarctic Land Slope Current intersect, showcased marine stramenopiles as dominant HFs species. Our findings offer insights into dominant taxa, spatial distribution patterns among heterotrophic flagellates, correlations between taxa distribution and environmental factors, and the exploration of potential indicator taxa.</p

    Temporal trends of 2009 H1N1 seroprevalence by demographic characterstics among the vaccinated subjects,Guangdong, 2010.

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    <p>CI:Confidence Interval;</p>*<p>compared with survey1,P<0.05(by Chi-square);</p>#<p>compared with survey2, P<0.05(by Chi-square);</p

    Sampling period for three serosurveys shown relative to epidemic curve in Guangdong China.

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    <p>Three surveys were consecutively carried out in 2010 during 9 months following the 2009 pandemic wave in Guangdong, China. Survey 1 were conducted from January 8 to January 24, survey 2 from March 15 to April 10 and survey 3 from August 23 to September 4.</p
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