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- Ekeberg, Tomas, 1983-, et al.
(författare)
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Three-dimensional structure determination with an X-ray laser
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Three-dimensional structure determination of a non-crystalline virus has been achieved from a set of randomly oriented continuous diffraction patterns captured with an X-ray laser. Intense, ultra-short X-ray pulses intercepted a beam of single mimivirus particles, producing single particle X-ray diffraction patterns that are assembled into a three-dimensional amplitude distribution based on statistical consistency. Phases are directly retrieved from the assembled Fourier distribution to synthesize a three-dimensional image. The resulting electron density reveals a pseudo-icosahedral asymmetric virion structure with a compartmentalized interior, within which the DNA genome occupies only about a fifth of the volume enclosed by the capsid. Additional electron microscopy data indicate the genome has a chromatin-like fiber structure that has not previously been observed in a virus.
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| 3. |
- Raklev, Are Reinert, 1976-, et al.
(författare)
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Constraining the MSSM with Dark Matter indirect detection data
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Recently, a claim of possible evidence for Dark Matter in data from the Fermi LAT experiment was made by Goodenough and Hooper [8]. We test the Dark Matter properties consistent with their claim in terms of the MSSM by a 24-dimensional parameter scan using nested sampling, excluding all but a very small region of the MSSM. Although this claim is very preliminary, and not made by the Fermi LAT experiment, our scan shows a possible approach for the analysis of future firm evidence from an indirect detection experiment, and its potential for heavily constraining models.
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| 4. |
- White, Jai, et al.
(författare)
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Crystallographic facet and alkali metal cation dependent glycerol electrooxidation on polycrystalline Pd probed by SECCM
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Glycerol is considered an important platform chemical for value-added organic chemical synthesis. The electrooxidation of glycerol in aqueous media provides a facile synthesis method to generate chemicals important for pharmaceutical and medical industries. Therefore, critical knowledge regarding the most active catalysts for the glycerol electrooxidation reaction (GEOR) is necessary for such a process to be viable. The GEOR on noble metals is well studied but there are significant gaps in the literature regarding the activity of specific crystal facets, particularly in the case of Pd. Through SECCM electrochemical mapping correlated with EBSD mapping to identify grain orientations, a much larger picture of the GEOR on Pd catalysts can be formed. Here, the facet dependent activity for the GEOR on Pd, evaluated through cyclic voltammetry using SECCM with co-located EBSD, is reported for the first time in alkaline solutions of KOH, NaOH and LiOH at pH 13. NaOH is shown to result in the highest performance for the GEOR and for all three electrolytes, Pd (111) provides the highest activity, Pd (001) provides intermediate to high activity and that Pd (101) is the least active. The facet dependent activity for the GEOR is directly mirrored for Pd oxidation and the subsequent PdO reduction process. Suggesting these two processes are signifiers towards catalytic activity for the GEOR.
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| 5. |
- White, Jai, et al.
(författare)
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Synergistic Bimetallic PdNi Nanoparticles : Enhancing Glycerol Electrooxidation while Preserving C3 Product Selectivity
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Electrochemical conversion of glycerol offers a promising route to synthesise value-added glycerol oxidation products (GOPs) from an abundant biomass-based resource. While noble metals provide a low overpotential for the glycerol electrooxidation reaction (GEOR) and high selectivity towards three-carbon (C3) GOPs, their efficiency and cost can be improved by incorporating non-noble metals. Here, we introduce an effective strategy to enhance the performance of Pd nanoparticles for the GEOR by alloying them with Ni. The resulting PdNi nanoparticles show a significant increase in both specific activity (by almost 60%) and mass activity (by almost 25%) during the GEOR at 40 °C. Additionally, they exhibit higher resistance to deactivation compared to pure Pd. Analysis of the GOPs reveals that the addition of Ni into Pd does not compromise the selectivity, with glycerate remaining at around 60% of the product fraction, and the other major product being lactate at around 30%. Density functional theory calculations confirm the reaction pathways and the basis for the higher activity of PdNi. This study demonstrates a significant increase in the GEOR catalytic performance, while maintaining the selectivity for C3 GOPs, using a more cost-effective nanocatalyst.
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