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Träfflista för sökning "WFRF:(Ding J) srt2:(2000-2004)"

Search: WFRF:(Ding J) > (2000-2004)

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  • Nyberg, M., et al. (author)
  • Bond formation in titanium fulleride compounds studied through x-ray emission spectroscopy
  • 2001
  • In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 63:11, s. art. no.-115117
  • Journal article (peer-reviewed)abstract
    • The geometric and electronic structures of titanium fulleride complexes have been studied at the gradient corrected density-functional theory level by using various C60Tix (x=1,2) clusters. The cluster with the Ti atom binding on the six-ring site (eta (6)) Of the fullerene is shown to be lower in energy than those with Ti atom adsorbed on either five-ring (eta (5)) Or bridge(eta (2)) sites. The bond formation for titanium fulleride has further been examined by calculated nonresonant, resonant, and off-resonant . x-ray emission spectra of the clusters, and a comparison to the experimental counterpart. The examination shows that only the theoretical spectra of clusters with a six-ring adsorption site are in close agreement with the experimental x-ray emission spectra of titanium fulleride films. Our results indicate that off-resonant x-ray emission spectra provide an excellent basis for the probing of the bonding between metals and organic molecules.
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  • Bäckhed, Fredrik, 1973, et al. (author)
  • The gut microbiota as an environmental factor that regulates fat storage
  • 2004
  • In: Proc Natl Acad Sci U S A. - : Proceedings of the National Academy of Sciences. ; 101:44, s. 15718-15723
  • Journal article (peer-reviewed)abstract
    • New therapeutic targets for noncognitive reductions in energy intake, absorption, or storage are crucial given the worldwide epidemic of obesity. The gut microbial community (microbiota) is essential for processing dietary polysaccharides. We found that conventionalization of adult germ-free (GF) C57BL/6 mice with a normal microbiota harvested from the distal intestine (cecum) of conventionally raised animals produces a 60% increase in body fat content and insulin resistance within 14 days despite reduced food intake. Studies of GF and conventionalized mice revealed that the microbiota promotes absorption of monosaccharides from the gut lumen, with resulting induction of de novo hepatic lipogenesis. Fasting-induced adipocyte factor (Fiaf), a member of the angiopoietin-like family of proteins, is selectively suppressed in the intestinal epithelium of normal mice by conventionalization. Analysis of GF and conventionalized, normal and Fiaf knockout mice established that Fiaf is a circulating lipoprotein lipase inhibitor and that its suppression is essential for the microbiota-induced deposition of triglycerides in adipocytes. Studies of Rag1-/- animals indicate that these host responses do not require mature lymphocytes. Our findings suggest that the gut microbiota is an important environmental factor that affects energy harvest from the diet and energy storage in the host.
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