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Sökning: WFRF:(Liu Ce Feng)

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  • Gardino, Alexandra K, et al. (författare)
  • Transient Non-native Hydrogen Bonds Promote Activation of a Signaling Protein
  • 2009
  • Ingår i: Cell. - : Elsevier BV. - 0092-8674 .- 1097-4172. ; 139:6, s. 1109-18
  • Tidskriftsartikel (refereegranskat)abstract
    • SummaryPhosphorylation is a common mechanism for activating proteins within signaling pathways. Yet, the molecular transitions between the inactive and active conformational states are poorly understood. Here we quantitatively characterize the free-energy landscape of activation of a signaling protein, nitrogen regulatory protein C (NtrC), by connecting functional protein dynamics of phosphorylation-dependent activation to protein folding and show that only a rarely populated, pre-existing active conformation is energetically stabilized by phosphorylation. Using nuclear magnetic resonance (NMR) dynamics, we test an atomic scale pathway for the complex conformational transition, inferred from molecular dynamics simulations (Lei et al., 2009). The data show that the loss of native stabilizing contacts during activation is compensated by non-native transient atomic interactions during the transition. The results unravel atomistic details of native-state protein energy landscapes by expanding the knowledge about ground states to transition landscapes.
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  • Lin, Yuan-Hua, et al. (författare)
  • Electrical transport properties of La2CuO4 ceramics processed by the spark plasma sintering
  • 2007
  • Ingår i: Journal of The American Ceramic Society. - : Wiley. - 0002-7820 .- 1551-2916. ; 90:12, s. 4005-4008
  • Tidskriftsartikel (refereegranskat)abstract
    • Highly dense La2CuO4 ceramics have been prepared by the spark plasma sintering technique. Temperature dependence of electrical conductivity indicates that La2CuO4 ceramics sintered at over 875 degrees C exhibit a metal-like behavior, which should be ascribed to the special La2CuO4 crystal structure and its correlation splitting of the half-filled d(x2-y2) band. Our experimental data indicate that all of the La2CuO4 samples exhibit positive thermoelectric power in the whole measuring temperature range, indicating that the majority of charge carriers are holes. It is desirable to obtain good thermoelectric performance for this system by optimizing the electrical properties and reducing the thermal conductivity.
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  • Resultat 1-15 av 15

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