| 1. |
- Liu, Lei, et al.
(författare)
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The structural determination of endohedral metallofullerene Gd@C-82 by XANES
- 2008
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Ingår i: Chemical Communications. - : Royal Society of Chemistry (RSC). - 1359-7345 .- 1364-548X. ; :4, s. 474-476
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Tidskriftsartikel (refereegranskat)abstract
- Although the Gd ion in Gd@C-82 has been shown to lie above the C-C bond on the C-2 axis as an anomalous structure from the MEM/Rietveld analysis, the present XANES study reveals that it lies above the hexagon on the C-2 axis as a normal structure, and Gd oscillates around its equilibrium position with an amplitude increasing with temperature increase.
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| 2. |
- Yu, Meijuan, et al.
(författare)
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3D local structure around Zn in Kti11p as a representative Zn-(Cys)4 motif as obtained by MXAN
- 2008
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Ingår i: Biochemical and Biophysical Research Communications - BBRC. - : Elsevier BV. - 0006-291X .- 1090-2104. ; 374:1, s. 28-32
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Tidskriftsartikel (refereegranskat)abstract
- Zinc is an important component of many proteins that play key roles in transcription, translation, and catalysis. Kti11p, DESR1, both belonging to a protein family characterized by a CSL zinc finger domain, and the co-catalytic zinc-protein PML containing a Zn2+ binding domain called RING or C3HC4 finger are all structurally determined by NMR although the zinc sites are silent to this spectroscopical method. The comparison of X-ray absorption near-edge spectroscopy (XANES) data for the three proteins demonstrates that fingerprints effect is a reliable method for a primary characterization of ligand species. Ab initio full MS Calculations performed by MAN are applied to obtain chemical and stereo structural information around the Zn ion in Kti11p. For the first time this high-spatial resolution technique confirms the formation of a stable Zn tetrahedral configuration with four sulfur ligands, and returns extremely accurate bond angle information between ligands.
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| 3. |
- Zhong, Jun, et al.
(författare)
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Bio-nano interaction of proteins adsorbed on single-walled carbon nanotubes
- 2009
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Ingår i: Carbon. - : Elsevier BV. - 0008-6223 .- 1873-3891. ; 47:4, s. 967-973
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Tidskriftsartikel (refereegranskat)abstract
- We applied X-ray absorption near edge structure (XANES) spectroscopy to investigate the adsorption of proteins onto single-walled carbon nanotubes (SWCNTs). Specific XANES spectral features such as peptide C=O bonds in proteins were recognized and found to be affected by the corresponding aromatic structure of SWCNTs. Experimental data combined with first-principle calculation of the investigated nano-complex allow the understanding of adsorption mechanism and reveal that an interface interaction occurs leading to precise structural distortions of proteins. The study also demonstrates that XANES is a powerful tool to characterize structural details of proteins at the interface of complex systems.
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| 4. |
- Zhong, Jun, et al.
(författare)
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Understanding the scattering mechanism of single-walled carbon nanotube based gas sensors
- 2010
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Ingår i: Carbon. - : Elsevier BV. - 0008-6223 .- 1873-3891. ; 48:7, s. 1970-1976
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Tidskriftsartikel (refereegranskat)abstract
- In the interaction between gas molecules with single-walled carbon nanotube (SWCNT) we show that as a result of collisions the gas scattering contributes with an important background signal and should be considered in SWCNT-based gas sensors. Experimental evidence of the collision-induced tube wall deformation is demonstrated using in situ X-ray absorption near-edge structure spectroscopy. Results support the occurrence of the scattering process and show how gas collisions may affect the electronic structure of SWCNTs.
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