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Sökning: WFRF:(Xu GS) > (2002-2004)

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1.
  • Adcox, K, et al. (författare)
  • PHENIX detector overview
  • 2003
  • Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - 0167-5087. ; 499:2-3, s. 469-479
  • Tidskriftsartikel (refereegranskat)abstract
    • The PHENIX detector is designed to perform a broad study of A-A, p-A, and p-p collisions to investigate nuclear matter under extreme conditions. A wide variety of probes, sensitive to all timescales, are used to study systematic variations with species and energy as well as to measure the spin structure of the nucleon. Designing for the needs of the heavy-ion and polarized-proton programs has produced a detector with unparalleled capabilities. PHENIX measures electron and muon pairs, photons, and hadrons with excellent energy and momentum resolution. The detector consists of a large number of subsystems that are discussed in other papers in this volume. The overall design parameters of the detector are presented. (C) 2002 Elsevier Science B.V. All rights reserved.
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2.
  • Xu, HY, et al. (författare)
  • Altered tumor necrosis factor-alpha (TNF-alpha) processing in adipocytes and increased expression of transmembrane TNF-alpha in obesity
  • 2002
  • Ingår i: Diabetes. - : American Diabetes Association. - 0012-1797 .- 1939-327X. ; 51:6, s. 1876-1883
  • Tidskriftsartikel (refereegranskat)abstract
    • Tumor necrosis factor-α (TNF-α) is synthesized as a 26-kDa transmembrane protein (mTNF-α), which may present on the cell surface or be processed to release the 17-kDa soluble form (sTNF-α). Because regulation of this ectodomain shedding might be critical in the generation of systemic versus local cytokine responses, we examined the rate of mTNF-α processing in adipocytes and its regulation in obesity. Here, we demonstrate that the 26-kDa mTNF-α is present in adipose tissue and that its production is significantly increased in different rodent obesity models as well as in obese humans. There was no apparent deficiency in the level of the major TNF-α converting enzyme in adipose tissue to account for the excess amount of mTNF-α produced in obesity. However, experiments in cultured fat cells stably expressing TNF-α demonstrated a significantly decreased rate of TNF-α cleavage in differentiated adipocytes compared with preadipocytes. Thus, a decreased processing rate of mTNF-α in mature adipocytes combined with an increase in TNF-α production may be a potential mechanism resulting in elevated membrane-associated TNF-α in adipose tissue in obesity.
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