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1 year ago

WP1130 The Qinghai ndash Tibet highway offers

Most of the area surrounding the Qinghai–Tibet highway has a well-preserved WP1130 in which the environment is extremely fragile and sensitive to outside influences (Yu and Lv, 2011). Even minor effects from human activities or climate change can lead to significant environmental damage (Klein et al., 2004). Apart from transportation, the environment in this region has few anthropogenic disturbances (Yan et al., 2013). The rapid development of road traffic due to freight transport and increasing tourism is exerting increasing pressure on roadside environments.

1 year ago

IncF plasmids were identified in

In a study, where the location of blaCTX-M-15 in E. coli isolates from different countries was investigated, in only 37% of the isolates the blaCTX-M-15 was transferable by conjugation or transformation which correlates well with the transfer ability described in our study ( Coque et al., 2008b). Possible explanation for transconjugation failure could be either plasmid Concanamycin A or transposition of mobile elements (likely ISEcp1-associated) into the chromosome ( Coque et al., 2008b and Poirel et al., 2005).
The replicon types detected among the 31 transconjugants and one transformant are summarized in Table 1. The most frequently detected replicon types among blaCTX-M-15-carrying plasmids are IncF-type plasmids (n = 12) (mostly as multi replicon plasmids with a combination of following replicons: IncFII, IncFIA and IncFIB), followed by IncI1 (n = 8), IncK (n = 3) and IncR (n = 1). Notably, a number of plasmids (n = 8) could not be assigned to any of the tested replicon types.

1 year ago

The discovery of CNTs in by Iijima opened the

AcknowledgmentsThis project is supported by National Natural Science Foundation of China (Grant No. 51405037), Natural Science Foundation of Hunan Province (2015JJ6002), Open Research Fund of Innovation Platform of Efficient & Clean Utilization of Energy (14K004).
Complex metal oxides nanowires; Single crystalline; Chemical solution deposition method
1. Introduction
2. Experimental
2.1. Synthesis of BaCuV2O7 nanowires
All chemicals (NH4VO3, Cu (NO3)2⋅xH2O, BaCl2, hydrochloric GPLG0634 95%, used in this study were purchased from Sigma Aldrich and used as received. In the synthesis of BaCuV2O7 nanowires, 1 mmol of NH4VO3 were dissolved in HCl/H2O = 1:2 v/v and stirred magnetically for 30 min at pH (1–2), and then 0.01 mmol of BaCl2, 0.02 Cu (NO3)2⋅xH2O mmol were mixed with the above solution and stirred magnetically for 30 min. The samples for the growth of nanowires were prepared by spin coating solution on precleaned Al2O3 and SiO2 substrates at 2000 rpm for 30 s with different thicknesses (50–150 nm) and each substrate was dried on a hot plate at 150 °C for 30 min. These samples were then placed in furnace and annealed in ambient atmosphere at 500 °C for 4 h.

1 year ago

While median THg values in ephemeral

The median wetland water MeHg concentration reported here was slightly higher relative to those reported from the Florida Everglades (range of reported medians 1995–2005: 0.19–0.28 ng/L; Scheidt and Kalla, 2007) and on the lower end of concentrations reported in a recent study from agricultural and managed wetlands in California (0.04–7.3 ng/L filtered; Alpers et al., 2014). Methylmercury concentrations in the open water portions of Lake Zapotlán were similar to reported values from natural lakes in temperate and northern oligotrophic lakes in North America (< 0.3 ng/L; Bodaly et al., 1998), despite the relatively high inputs of THg in natural and wastewater runoff, and high MeHg in wastewater. The explanations for these lower MeHg concentrations are potentially more complex than those for reduced THg in this PYZD-4409 system. Although particle setting is an important mechanism that affects all particle-bound Hg species, there are a number of species-specific mechanisms that can result in reduced MeHg concentrations. Potentially high MeHg photodecomposition rates in this shallow and warm subtropical freshwater system may account for low MeHg concentrations measured in surface waters (Seller et al., 1996, Zhang and Hsu-Kim, 2010 and Black et al., 2012). The biogeochemical conditions of this environment may not favor net MeHg production, which seems to be reflected in the low %MeHg in lake sediments. This could be a function of the high pH (Kelly et al., 2003 and Golding et al., 2008) or high concentrations of divalent cations (inferred from pH and conductivities of ~ 1000 μS/cm) limiting the uptake of bioavailable Hg(II) by methylating bacteria (Daguene et al., 2012). In eutrophic systems, such as Lake Zapotlán, so-called bloom dilution may be a factor, where during periods of high primary production of phytoplankton the amount of bioavailable Hg in the water column is sorbed to, and distributed among, a greater number of algal cells. Previous work has shown that this can result in lower inorganic Hg and lower MeHg concentrations throughout the food web (Pickhardt et al., 2002).

1 year ago

Table nbsp Daily average personal pollutant concentrations

Ratios of traffic modes against cycling varied significantly except walking. During the sampling process, percentages of ratios higher than 1 were 61%, 81%, 44% and 23% for bus, subway, taxi and walking respectively. That means walking was exposed to a lower BC environment on these routes in summer. The walking to cycling ratios of BC exposure concentrations were between 1.42 and 0.63 with an average of 0.88. Meanwhile, walking to cycling ratios were relatively stabilized below the ratio 1. For walking ratios higher than 1, that may be caused by the fact that the commuters were occasionally exposed to particular emissions such as barbecue stalls, tobacco smoke, coal burning and garages when they A 887826 were testing engines, etc. On R1, ratios of traffic modes were relatively low and stable compared to that of R2 and R3. As for larger flow rates of traffic and visitor combined with high tall building density, R2 showed higher variations in traffic modes to cycling ratios. Compared with R1 and R2, walking to cycling ratio on R3 was higher even though no barbeque and other particular emissions were spotted along the pavements. This is due to the fact that R3 contains 3–5 story residential buildings and dense shade tree cover along the two sides of photosystems two-lane road. Vehicle traffic and its trail gas were largely restricted to this narrow route and it\'s difficult for gas diffusion. This was further proved by the between-route comparison. The comparison between every two routes showed that the ratio of average BC of cycling (and walking) along R1 to that along R3 was 1.26 (1.05), and R2–R3 was 1.20 (1.00). It indicates that average BC along busy routes R1 and R2 was slightly higher than that along R3. The dispersion status of the road microenvironment may be a key factor for this situation. But average BC of all traffic modes (except subway) on R3 was the lowest among these three routes because of its lowest traffic density for bus and truck which contributed a large portion of BC to road traffic.

1 year ago

Monitoring studies under alternating current AC OHVPLs have

While air ions do not include charged particles, space charge includes both air ions and charged particles. Ion mobility spectra have been reported but these have not 'LP533401 presented the actual charged particle concentrations under the lines (Buckley et al., 2008 and Wright et al., 2014). Total net space charge concentrations have also been estimated using direct current (DC) electric field measurements (Fews et al., 1999, Fews et al., 2002, Matthews et al., 2010 and Matthews et al., 2012).

1 year ago

It could be also found from

It could be also found from Fig. 7(a) that Cinacalcet the mass ratio of Ag3PO4:WO3 had an obvious influence on the catalytic performance of Ag3PO4/3DOM-WO3 catalysts for the photodegradation of RhB. Compared with A3W7(270) and A7W3(270), the catalyst of A5W5(270) exhibited the highest catalytic activity and could decompose 10 ppm of RhB (degradation efficiency >99%) in 4 min under visible light irradiation. While for the catalysts of A3W7(270) and A7W3(270), 8 min and 6 min were required, respectively, under the same reaction conditions. These results can also be confirmed by the kinetic data curves shown in Fig. 7(b). It was observed that the photocatalytic degradation of RhB follows the pseudo first-order reaction. The rate constant k is calculated by the Langmuir–Hinshelwood model [ln(C0/C) = kt]. The kinetic rate constants on A3W7(270), A5W5(270) and A7W3(270) were about 0.70 min−1, 1.26 min−1 and 0.89 min−1, respectively, which were significantly higher than those over pure Ag3PO4 (0.095 min−1) and 3DOM-WO3 (0.019 min−1). The results suggest replication suitable mass ratio of Ag3PO4 to 3DOM-WO3 could improve the catalytic activity of the composite photocatalysts. In current catalytic system, the catalyst A5W5 exhibited the highest catalytic performance.