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Träfflista för sökning "WFRF:(Schmid D) srt2:(2005-2009)"

Sökning: WFRF:(Schmid D) > (2005-2009)

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  • Bosch, H, et al. (författare)
  • Needs transilation
  • 2008
  • Ingår i: GEBURTSHILFE UND FRAUENHEILKUNDE. - 0016-5751. ; 68:4, s. 425-425
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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  • Frey, Alexander D., et al. (författare)
  • Globin-expression postpones onset of stationary phase specific gene expression in Escherichia coli
  • 2007
  • Ingår i: Journal of Biotechnology. - : Elsevier BV. - 1873-4863 .- 0168-1656. ; 129:3, s. 461-471
  • Tidskriftsartikel (refereegranskat)abstract
    • We have analyzed gene expression of Escherichia coli MG1655 expressing native and engineered bacterial globin proteins, in order to identify the molecular mechanisms leading to the improved phenotypical traits relative to control cells under oxygen-limited conditions. Regulated expression of hemoglobin and flavohemoglobin proteins postponed the onset of rpoS expression relative to plasmid bearing control cells. This change in expression pattern coincided with the expression pattern of stationary-phase specific genes including sigma(S)-dependent and sigma(S)-independent genes. Furthermore, several genes known to affect rpoS transcription, rpoS mRNA stability and sigma(S) turnover were regulated in such a manner as to ultimately lower the cellular level of sigma(S) in all globin-expressing strains. In a strain harboring an rpoS-lacZ fusion, lacZ expression correlated with acetate accumulation, a metabolite that is known to activate rpoS transcription, but not with growth. Therefore, we hypothesize that reduced excretion of acetate in globin expressing cells prevents induction of stationary phase specific genes. Additionally, several genes responding to carbon starvation (e.g. csrAB, cstA, sspA) were expressed at lower levels in globin-expressing cells. These findings are in good agreement with previous reports showing a more efficient energy household, i.e. also reduced glucose consumption, in hemoglobin- and flavohemoglobin-expressing cells relative to controls. (c) 2007 Elsevier B.V. All rights reserved.
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  • Knapp, M., et al. (författare)
  • Unusual process of water formation on RuO2(110) by hydrogen exposure at room temperature
  • 2006
  • Ingår i: The Journal of Physical Chemistry Part B. - : American Chemical Society (ACS). - 1520-5207 .- 1520-6106. ; 110:29, s. 14007-14010
  • Tidskriftsartikel (refereegranskat)abstract
    • The reduction mechanism of the RuO2(110) surface by molecular hydrogen exposure is unraveled to an unprecedented level by a combination of temperature programmed reaction, scanning tunneling microscopy, high-resolution core level shift spectroscopy, and density functional theory calculations. We demonstrate that even at room temperature hydrogen exposure to the RuO2(110) surface leads to the formation of water. In a two-step process, hydrogen saturates first the bridging oxygen atoms to form (O-br-H) species and subsequently part of these O-br-H groups move to the undercoordinated Ru atoms where they form adsorbed water. This latter process is driven by thermodynamics leaving vacancies in the bridging O rows.
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  • Resultat 1-10 av 21

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