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    ABSTRACT: Recent advances in X-ray Absorption Spectroscopy (XAS) are discussed with a focus on the use of high-energy X-rays and measurements at the K-edges of heavy elements (atomic number >50). The review addresses advantages and drawbacks of measuring at the K-edges, highlights selected examples of XAS in the high- energy range, and outlines appealing future perspectives on instrumentation, data analysis and applications.
    No preview · Article · Oct 2015 · Science of Advanced Materials
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    ABSTRACT: The use of inorganic fillers is an interesting strategy to improve the electrochemical performances of PBI membranes for application as electrolytes in HT-PEMFCs. Here, we prepared several mesoporous silica (SBA-15) based hybrids, functionalised with different moieties, namely acidic (SO3H-), basic (NH2-), and amphoteric (SO3H-NH2) units. The electrochemical properties of the resulting electrolytes were investigated in terms of proton transport and functional tests by varying the silica functionalization degree in the range 10–70 mol%, as well as the particles loading in the polymer (0–30 wt%). The actual effectiveness of the SBA-15 functionalization process in improving the electrolyte properties was compared with both the unfilled membrane and the one filled with pristine SBA-15. The best conductivity (∼90 mS cm−1 at 120 °C, 30%RH) was obtained with PBI composites loaded with 30 wt% of non-functionalized SBA-15. The use of fillers functionalized with acidic, basic of amphoteric groups did not lead to improvements with respect to pure SBA-15. This could be related to the set up of significant interactions between the functionalised fillers and H3PO4, which negatively influence the proton mobility. Encouraging MEA results (power peak >320 mW cm−2) were obtained in case of membranes based on pure SBA-15. These performances make the SBA-15/PBI composites particularly interesting for application in HT-PEMFCs.
    No preview · Article · Oct 2015 · Journal of Power Sources
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    ABSTRACT: Diffuse involvement of liver and spleen is frequently seen in brucellosis, suppurative abscesses caused by Brucella are less common but well described. With the increased availability of cross-sectional imaging techniques, reports have become more frequent. Four patients with hepatosplenic abscesses caused by Brucella spp. are described and included in a review of 115 previously published cases. Clinical characteristics and patterns on ultrasound (US) and computer tomography imaging were analyzed. Furthermore, the proportion of patients with brucellosis affected by suppurative hepatosplenic lesions was estimated. Hepatosplenic abscesses were seen in 1.2% of patients with brucellosis, which were mostly caused by Brucella melitensis. Imaging analysis revealed two main distinct patterns. Solitary abscesses involving liver more frequently than spleen, and showing characteristic central calcifications, characterize the first pattern. Multiple smaller abscesses, frequent spleen involvement, and absence of calcifications characterize the second pattern. Blood and aspirate cultures were frequently negative, however, the positivity rate increased over the past years. Indirect Coombs test was positive in 96%. Half of the patients were cured by antibiotic treatment; case fatality in this series was 1.9%. Hepatosplenic abscesses due to Brucella infections have characteristic imaging findings. Clinicians should be aware of these and the proactive use of cross-sectional imaging, particularly US, should be encouraged in endemic regions. © The American Society of Tropical Medicine and Hygiene.
    No preview · Article · Aug 2015 · The American journal of tropical medicine and hygiene

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Top publications last week by reads

 
Lithos 06/2015; 232:49-75. DOI:10.1016/j.lithos.2015.05.017
612 Reads
 
Haematologica 01/2016; DOI:10.3324/haematol.2015.136739
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