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Sökning: WFRF:(Hoglund M)

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11.
  • Backis, A., et al. (författare)
  • Time- and energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors
  • 2021
  • Ingår i: Measurement science and technology. - : IOP PUBLISHING LTD. - 0957-0233 .- 1361-6501. ; 32:3
  • Tidskriftsartikel (refereegranskat)abstract
    • The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few mu eV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of similar to mu s short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of mu s wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube.
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13.
  • Dagnell, C, et al. (författare)
  • Neurotrophins in COPD
  • 2009
  • Ingår i: RESPIRATORY MEDICINE. - 0954-6111. ; 103, s. S4-S4
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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19.
  • Onatsu, J., et al. (författare)
  • Tau, S100B and NSE as Blood Biomarkers in Acute Cerebrovascular Events
  • 2020
  • Ingår i: In Vivo. - : Anticancer Research USA Inc.. - 0258-851X .- 1791-7549. ; 34:5, s. 2577-2586
  • Tidskriftsartikel (refereegranskat)abstract
    • Background/Aim: We aimed to analyze the diagnostic value of total tau (T- tau), S-100 calcium-binding protein B (S100B) and neuron-specific enolase (NSE) as blood-based biomarkers in acute ischemic stroke (AIS) or transient ischemic attack (TIA), and their correlation with symptom severity, infarct size, etiology and outcome. Patients and Methods: A total of 102 patients with stroke and 35 with TIA were analyzed. Subacute (63.8 +/- 50.1 h) plasma T-tau was measured with the single-molecule array (Simoa) method and NSE and S100B were evaluated for comparison. We evaluated biomarkers associations with: (i) diagnosis of AIS or TIA, (ii) cerebral infarction volume in the brain computed tomography, (iii) stroke etiology, (iv) clinical stroke severity and (iv) functional outcome after three months. Results: T-tau was higher in patients with stroke (1.0 pg/ml (IQR=0.3-2 2)] than with TIA (05 pg/ml (IQR=0.2- 1 .0), p=0.02] . The levels of S100B were also increased in stroke [0.082 mu g/l (IQR=0.049-0.157)] patients compared to TIA patients (0.045 mu g/l (IQR=0.03 -0.073 ), p<0.001]. However, when the results were adjusted for confounders, significance was lost. Serum levels of NSE among patients with AIS [11.85 mu g/l (IQR=9.30-16.14)] compared to those with TIA (10.96 mu g/l (IQR=7 .98-15.33), p=0.301 were equal. T-tau and S100B concentrations significantly correlated with cerebral infarction volume (r=0.412, p<0.001) and (r=0.597, p<0.001), also after corrections (p<0.001). mRS scores at three-month follow-up correlated with T-tau (r=0.248, p=0.016) and S100B concentrations (r=0.205, p=0.045). Conclusion: For the diagnosis of TIA vs. AIS, blood T-tau and S100B concentrations discriminated only modestly. Additionally, groups were not separable after measuring of T-tau and S100B levels in the blood. T-tau and S100B concentrations correlated with the infarct size, but were not alone predictive for functional outcome at 3 months.
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  • Resultat 11-20 av 145
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