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Sökning: WFRF:(Forsyth M) > (2015-2018)

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  • 2017
  • Ingår i: Physical Review D. - 2470-0010 .- 2470-0029. ; 96:2
  • Tidskriftsartikel (refereegranskat)
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  • Popp, David, et al. (författare)
  • Flow-aligned, single-shot fiber diffraction using a femtosecond X-ray free-electron laser
  • 2017
  • Ingår i: CYTOSKELETON. - : WILEY. - 1949-3584 .- 1949-3592. ; 74:12, s. 472-481
  • Tidskriftsartikel (refereegranskat)abstract
    • A major goal for X-ray free-electron laser (XFEL) based science is to elucidate structures of biological molecules without the need for crystals. Filament systems may provide some of the first single macromolecular structures elucidated by XFEL radiation, since they contain one-dimensional translational symmetry and thereby occupy the diffraction intensity region between the extremes of crystals and single molecules. Here, we demonstrate flow alignment of as few as 100 filaments (Escherichia coli pili, F-actin, and amyloid fibrils), which when intersected by femtosecond X-ray pulses result in diffraction patterns similar to those obtained from classical fiber diffraction studies. We also determine that F-actin can be flow-aligned to a disorientation of approximately 5 degrees. Using this XFEL-based technique, we determine that gelsolin amyloids are comprised of stacked -strands running perpendicular to the filament axis, and that a range of order from fibrillar to crystalline is discernable for individual -synuclein amyloids.
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  • Yan, Yajing, 1990, et al. (författare)
  • Investigating discharge performance and Mg interphase properties of an Ionic Liquid electrolyte based Mg-air battery
  • 2017
  • Ingår i: Electrochimica Acta. - : Elsevier BV. - 0013-4686. ; 235, s. 270-279
  • Tidskriftsartikel (refereegranskat)abstract
    • The performance of a primary Mg-air cell was evaluated at room temperature using a 72 mol% ethylene glycol/trihexyl(tetradecyl) phosphonium chloride ([P-6,P-6,P-6,P-14][Cl]) ionic liquid (IL) electrolyte. The cell was cycling in ambient air as well as in the presence of pure oxygen, and interestingly the cell presented much higher discharge capacity in air than in oxygen, which was attributed to the effect of water in the ambient air. When operated in ambient air, the cell showed promising discharge behaviour with a maximum rate of 0.2 mA cm(-2) and a discharge capacity of around 4.8 mAh cm(-2). When operated at a low rate 0.0075 mA cm(-2), the cell lasted for over 260 h, 10 days, at a potential above 1.3 V. Thus, the main focus of this study is the analysis of the mechanism of discharge capacity loss in this electrolyte, which revealed that, both the polarization due to the presence of a resistive Mg interphase on the anode surface and, concentration polarization due to the quick accumulation of Mg2+ ions in the IL based electrolyte are responsible. In-depth surface characterization suggested the discharge products accumulated on the Mg surface with a proposed formula [P6,6,6,14].Cl.Mg(OH)(2).9[Mg(OCH2CH2OH)Cl]. 40H(2)O most likely had a highly-crosslinked chemical structure, which were responsible for the limited ionic conductivity of the Mg interphase.
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  • Resultat 1-6 av 6

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