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Sökning: WFRF:(von Borczyskowski A.)

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1.
  • von Borczyskowski, A., et al. (författare)
  • Familial factors and suicide : an adoption study in a Swedish National Cohort
  • 2011
  • Ingår i: Psychological Medicine. - 0033-2917 .- 1469-8978. ; 41:4, s. 749-58
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: Parental characteristics influence the risk of offspring suicide. In this study we wanted to separate the hereditary from the environmental influence of such factors by comparing their effects in the adopted versus non-adopted.MethodA register study was conducted in a national cohort of 2 471 496 individuals born between 1946 and 1968, including 27 600 national adoptees, followed-up for suicide during 1987-2001. Cox regression was used to calculate hazard ratios (HR) for suicide of socio-economic indicators of the childhood household and biological parents' suicide, alcohol abuse and psychiatric morbidity separately in the adopted and non-adopted. Differences in effects were tested in interaction analyses. RESULTS: Suicide and indicators of severe psychiatric disorder in the biological parents had similar effects on offspring suicide in the non-adopted and adopted (HR 1.5-2.3). Biological parents' alcohol abuse was a risk factor for suicide in the non-adopted group only (HR 1.8 v. 0.8, interaction effect: p=0.03). The effects of childhood household socio-economic factors on suicide were similar in adopted and non-adopted individuals, with growing up in a single parent household [HR 1.5 (95% confidence interval 1.4-1.5)] as the most important socio-economic risk factor for the non-adopted. CONCLUSIONS: The main familial effects of parental suicide and psychiatric morbidity on offspring suicide are not mediated by the post-natal environment or imitation, in contrast to effects of parental alcohol abuse that are primarily mediated by the post-natal environment. Social drift over generations because of psychiatric disorders does not seem likely to explain the association of socio-economic living conditions in childhood to suicide.
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3.
  • Zenkevich, E.I., et al. (författare)
  • Ligand exchange dynamics and temperature effects upon formation of nanocomposites based on semiconductor CdSe/ZnS quantum dots and porphyrins: Ensemble and single object measurements
  • 2012
  • Ingår i: Macroheterocycles. - : Ivanovo State University of Chemistry and Technology. - 1998-9539. ; 5:2, s. 98-114
  • Tidskriftsartikel (refereegranskat)abstract
    • Dye molecules with pyridyl side substituents (porphyrins and heterocyclic perylene diimides) coordinatively attached to semiconductor CdSe/ZnS quantum dots (QDs) surface form quasi-stable QD-Dye nanocomposites of various geometry in the competition with capping molecules (tri-n-octyl phosphine oxide or long chain amines) exchange. This results in photoluminescence (PL) quenching of the QDs both due to Foerster resonance energy transfer and formation of non-radiative surface states. QD surface is inhomogeneous with respect to the involved attachment and detachment processes. The formation of QD-Porphyrin nanocomposites is realized at least two time scales (60 and 600 s), which is attributed to a reorganisation of tri-n-octylphosphine oxide capping shell. In a low temperature range of 220÷240 K related changes in QD absorption and emission reveal a phase transition of the capping shell (tri-n-octyl phosphine oxide and amine). In QD-Dye nanocomposites, this phase transition is enhanced considerably by only a few attached dye molecules and has impact on the QD core structure followed by changes of PL quenching and exciton-phonon coupling. A combination of ensemble and single molecule spectroscopy of QD-Dye nanocomposites reveals that few or even only one attached dye molecule change the surface distribution and energy of dye related surface trap states considerably. © ISUCT Publishing.
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4.
  • Zenkevich, Eduard I, et al. (författare)
  • Quantitative Analysis of Singlet Oxygen ((1)O(2)) Generation via Energy Transfer in Nanocomposites Based on Semiconductor Quantum Dots and Porphyrin Ligands
  • 2011
  • Ingår i: The Journal of Physical Chemistry C. - : American Chemical Society. - 1932-7447 .- 1932-7455. ; 115:44, s. 21535-21545
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the results of a detailed quantitative experimental exciton relaxation pathways as well as direct measurement of singlet oxygen ((1)O(2)) generation efficiencies for CdSe/ZnS quantum dot (QD)- porphyrin nanocomposites in toluene at 295 K QD photoluminescence. quenching in nanocomposites is caused. by two main factors: electron tunneling in the quantum confined QD.(efficiency 0.85-0.90) and Forster resonance energy transfer (FRET) QD -andgt; porphyrin (quenching efficiency 0.10-0.15). Efficiencies of (1)O(2) generation gamma(Delta) by nanocomposites are essentially higher with respect to those obtained for QDs alone. For nanocomposites, the nonlinear decrease of (1)O(2) generation efficiency gamma(Delta) on the laser pulse energy is caused by nonradiative intraband Auger processes, realized in the QD counterpart. Finally, FRET efficiencies found from the direct sensitization data for porphyrin fluorescence in, nanocomposites (Phi(FRET) = 0.14 +/- 0.02) are in good agreement with the corresponding values obtained via the direct (1)O(2) generation measurements at low laser excitation (Phi(Delta)(FRET) = 0.12 +/- 0.03). The obtained quantitative results provide for the first time strong evidence that a FRET process QD -andgt; porphyrin is the reason for singlet oxygen generation by nanocomposites.
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