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Sökning: LAR1:gu > Göteborgs universitet

  • Resultat 81191-81200 av 166476
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81191.
  •  
81192.
  • Kjær, C., et al. (författare)
  • Gas-phase Förster resonance energy transfer in mass-selected ions with methylene or peptide linkers between two dyes: a concerted dance of charges
  • 2020
  • Ingår i: Physical chemistry chemical physics : PCCP. - : Royal Society of Chemistry (RSC). - 1463-9084 .- 1463-9076. ; 22:19, s. 11095-11100
  • Tidskriftsartikel (refereegranskat)abstract
    • Förster Resonance Energy Transfer (FRET) between a photoexcited and a ground-state dye is dictated by how far apart the two dyes are compared to the Förster distance. While there is a significant number of studies on the process for biomacromolecules in solution, there are only a few reports on gas-phase FRET. Here we report on a simple gas-phase model system, synthesized with the rhodamine 575 (R575+) and rhodamine 640 (R640+) FRET pair and a covalent linker with four methylenes, R575+-(CH2)4-R640+. Each dye carries a positive charge which allows for mass-spectroscopy experiments. We have recorded gas-phase dispersed fluorescence spectra of the mass-selected dications excited at different wavelengths using the homebuilt LUNA (LUminescence iNstrument in Aarhus) setup and find in all cases that emission is exclusively from the R640+ acceptor dye. The linker does not interfere electronically with the dyes and simply acts as a spacer. We can therefore establish the direct effect of the interaction between the two dyes when it comes to emission band maximum. Indeed, we find that R640+ experiences a significant shift in its maximum from 560 ± 1 nm for the monomer cation to 577 ± 2 nm in the presence of R575+, independent of initial excitation of R575+ or R640+. This redshift is ascribed to the large polarizability along the long axis of the xanthene core structure, and that this polarizability is larger in the excited state than in the ground state. Experiments were also done on a triply charged 11-mer peptide labelled with the same two dyes, R575+-(Gly-Gln)5-Lys-R640+ + H+ (Gly = glycine, Gln = glutamine, and Lys = lysine) where the extra positive charge is located on the peptide. Again a redshifted emission spectrum of the donor is observed with maximum at 582 ± 2 nm. Our work clearly demonstrates strong sensitivity of the photophysics of one dye to the nearby environment, and that caution is needed when using the energy transfer efficiency to infer dye-dye separations in gas-phase experiments.
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81193.
  • Kjaer, Josefin, et al. (författare)
  • Long-term outcome after resection and thermal hepatic ablation of pancreatic neuroendocrine tumour liver metastases
  • 2021
  • Ingår i: BJS open. - : Oxford University Press (OUP). - 2474-9842. ; 5:4
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: Pancreatic neuroendocrine tumours (Pan-NETs) are rare tumours that often present with or develop liver metastases. The aim of this retrospective study was to evaluate liver surgery and thermal hepatic ablation (THA) of Pan-NET liver metastases and to compare the outcomes with those of a control group. METHOD: Patients with Pan-NET treated in Uppsala University Hospital and Sahlgrenska University Hospital from 1995-2018 were included. Patient records were scrutinized for baseline parameters, survival, treatment and complications. RESULTS: Some 108 patients met the criteria for inclusion; 57 patients underwent treatment with liver surgery or THA and 51 constitute the control group. Median follow-up was 3.93years. Five-year survival in the liver surgery/THA group was 70.6 (95 per cent c.i. 0.57 to 0.84) per cent versus 42.4 (95 per cent c.i. 40.7 to 59.1) per cent in the control group (P=0.016) and median survival was 9.1 (95 per cent c.i. 6.5 to 11.7) versus 4.3 (95 per cent c.i. 3.4-5.2) years. In a multivariable analysis, surgery or THA was associated with a decreased death-years rate (hazard ratio 0.403 (95 per cent c.i. 0.208 to 0.782, P=0.007). CONCLUSION: Liver surgery and/or THA was associated with longer overall survival in Pan-NET with acceptable mortality and morbidity rates. These treatments should thus be considered in Pan-NET patients with reasonable tumour burden in an intent to alleviate symptoms and to improve survival.
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81194.
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81195.
  • Kjaer, Mats, 1974, et al. (författare)
  • Modelling natural gas futures returns
  • 2006
  • Ingår i: Energy Risk. ; November 2006, s. 56-62
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
  •  
81196.
  •  
81197.
  • Kjaer, Mats, 1974 (författare)
  • Pricing of Some Path-Dependent Options on Equities and Commodities
  • 2006
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • This thesis brings together three papers about the pricing of European and Bermudan path-dependent options, and one paper about the stochastic modelling of a futures price curve. Paper one proposes a fast numerical method to compute the price of so called cliquet options with global floor, when the underlying asset follows the Bachelier-Samuelson model. These options often constitute the option part of many capital guaranteed products, and are slow to price with existing Monte Carlo and PDE methods. Paper two deals with the pricing of swing options, when the logarithm of the underlying asset follows an Ornstein-Uhlenbeck process driven by a jump diffusion. Swing options are Bermudan or American options with multiple exercise rights, and are common on the energy markets. Paper three investigates the valuation of a natural gas storage facility, when gas trading is permitted on the spot- and futures markets simultaneously. The main idea is to interpret the storage as a swing option and then apply option pricing methods. Paper four proposes, estimates and evaluates two classes of parsimonious models of the correlation matrix for natural gas futures returns. The individual futures prices follow a Bachelier-Samuelson model with time-dependent volatility.
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81198.
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81199.
  •  
81200.
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Blennow, Kaj, 1958 (1862)
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Chen, Deliang, 1961 (641)
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