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Träfflista för sökning "WFRF:(Svensson Olof) ;srt2:(2015-2019)"

Sökning: WFRF:(Svensson Olof) > (2015-2019)

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51.
  • Persson, Carl, et al. (författare)
  • Paleoekologi och klimatets, strandlinjens och landskapets föränderlighet
  • 2015
  • Ingår i: Gustavstorpsvägen : mellanneolitiska hyddor vid en kustnära våtmark. Särskild arkeologisk undersökning och arkeologisk förundersökning 2011. Mörrum socken, Karlshamns kommun i Blekinge län. - Karlskrona : Blekinge museum. ; s. 27-34
  • Bokkapitel (övrigt vetenskapligt)
52.
  • Petridou, Eleni Th, et al. (författare)
  • Maternal and birth anthropometric characteristics in relation to the risk of childhood lymphomas : a Swedish nationwide cohort study
  • 2015
  • Ingår i: European Journal of Cancer Prevention. - 0959-8278 .- 1473-5709. ; 24:6, s. 535-541
  • Tidskriftsartikel (refereegranskat)abstract
    • This Swedish nationwide cohort study aims to examine the role of maternal characteristics (maternal age, education, smoking, BMI, diabetes, and preeclampsia) and multiple intrauterine growth measures on the risk of childhood lymphomas. A total of 3 444 136 singleton live births registered in the Swedish Medical Birth Register were analyzed, among whom there were 515 incident non-Hodgkin lymphoma (NHL) cases and 169 Hodgkin lymphoma (HL) cases aged 0-14 years at diagnosis (1973-2007) identified through linkage with the Swedish Cancer Register. Proportional hazards models were used to estimate the hazard ratio (HR) and 95% confidence intervals (95% CI) of NHL and HL. Male sex (HR=2.00, 95% CI: 1.66-2.41), older maternal age (HR=1.03, 95% CI: 1.00-1.06, per 1-year increase), and large for gestational age compared with appropriate for gestational age (AGA) birth weight (HR=1.83, 95% CI: 1.20-2.79) were correlated with the risk of NHL; of note, in subanalysis by sex, the latter association was confined to girls (HR=3.37, 95% CI: 1.90-5.97, Pinteraction by sex=0.008). The risk of childhood HL overall was more evident among boys (HR=2.03, 95% CI: 1.46-2.81), whereas indices of accelerated fetal growth were not convincingly associated with the risk of HL. Apart from the established association with sex, the findings point to accelerated intrauterine growth as a risk factor for childhood NHL that may differ by sex. Given the rarity of this condition at birth, however, further studies with more elaborate indices are needed to conclude on its association with rare diseases such as HL.
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53.
  • Ren, Yansong, et al. (författare)
  • A Multicontrolled Enamine Configurational Switch Undergoing Dynamic Constitutional Exchange
  • 2018
  • Ingår i: Angewandte Chemie International Edition. - 1433-7851. ; 57:21, s. 6256-6260
  • Tidskriftsartikel (refereegranskat)abstract
    • A multiresponsive enamine-based molecular switch is presented, in which forward/backward configurational rotation around the C=C bond could be precisely controlled by the addition of an acid/base or metal ions. Fluorescence turn-on/off effects and large Stokes shifts were observed while regulating the switching process with CuII. The enamine functionality furthermore enabled double dynamic regimes, in which configurational switching could operate in conjunction with constitutional enamine exchange of the rotor part. This behavior was used to construct a prototypical dynamic covalent switch system through enamine exchange with primary amines. The dynamic exchange process could be readily turned on/off by regulating the switch status with pH.
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54.
  • Ren, Yansong, et al. (författare)
  • A Multicontrolled Enamine Configurational Switch Undergoing Dynamic Constitutional Exchange
  • 2018
  • Ingår i: Angewandte Chemie International Edition. - WILEY-V C H VERLAG GMBH. - 1433-7851 .- 1521-3773. ; 57:21, s. 6256-6260
  • Tidskriftsartikel (refereegranskat)abstract
    • A multiresponsive enamine-based molecular switch is presented, in which forward/backward configurational rotation around the C=C bond could be precisely controlled by the addition of an acid/base or metal ions. Fluorescence turn-on/off effects and large Stokes shifts were observed while regulating the switching process with Cu-II. The enamine functionality furthermore enabled double dynamic regimes, in which configurational switching could operate in conjunction with constitutional enamine exchange of the rotor part. This behavior was used to construct a prototypical dynamic covalent switch system through enamine exchange with primary amines. The dynamic exchange process could be readily turned on/off by regulating the switch status with pH.
  •  
55.
  • Ren, Yansong, et al. (författare)
  • Multistimuli-Responsive Enaminitrile Molecular Switches Displaying H+-Induced Aggregate Emission, Metal Ion-Induced Turn-On Fluorescence, and Organogelation Properties
  • 2018
  • Ingår i: Journal of the American Chemical Society. - American Chemical Society (ACS). - 0002-7863. ; 140:42, s. 13640-13643
  • Tidskriftsartikel (refereegranskat)abstract
    • Multistimuli-responsive enaminitrile-based configurational switches displaying aggregation-induced emission (AIE), fluorescence turn-on effects, and super gelation properties are presented. The E-isomers dominated (>97%) in neutral/basic solution, and the structures underwent precisely controlled switching around the enamine C=C bond upon addition of acid/base. Specific fluorescence output was observed in response to different external input in the solution and solid states. In response to H+, configurational switching resulted in complete formation of the nonemissive Z-H+-isomers in solution, however displaying deep-blue to blue fluorescence (Phi(F) up to 0.41) in the solid state. In response to Cu-II in the solution state, the E-isomers exhibited intense, turn-on, blue-green fluorescence, which could be turned off by addition of competitive coordination. The acid/base-activated switching, together with the induced AIE-effects, further enabled the accomplishment of a responsive superorganogelator. In nonpolar solvents, a blue-fluorescent supramolecular gel was formed upon addition of acid to the E-isomer suspension. The gelation could be reversed by addition of base, and the overall, reversible process could be repeated at least five cycles.
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56.
  • Ren, Yansong, et al. (författare)
  • Multistimuli-Responsive Enaminitrile Molecular Switches Displaying H+-Induced Aggregate Emission, Metal Ion-Induced Turn-On Fluorescence, and Organogelation Properties
  • 2018
  • Ingår i: Journal of the American Chemical Society. - 0002-7863 .- 1520-5126. ; 140:42, s. 13640-13643
  • Tidskriftsartikel (refereegranskat)abstract
    • Multistimuli-responsive enaminitrile-based configurational switches displaying aggregation-induced emission (AIE), fluorescence turn-on effects, and super gelation properties are presented. The E-isomers dominated (>97%) in neutral/basic solution, and the structures underwent precisely controlled switching around the enamine C=C bond upon addition of acid/base. Specific fluorescence output was observed in response to different external input in the solution and solid states. In response to H+, configurational switching resulted in complete formation of the nonemissive Z-H+-isomers in solution, however displaying deep-blue to blue fluorescence (Phi(F) up to 0.41) in the solid state. In response to Cu-II in the solution state, the E-isomers exhibited intense, turn-on, blue-green fluorescence, which could be turned off by addition of competitive coordination. The acid/base-activated switching, together with the induced AIE-effects, further enabled the accomplishment of a responsive superorganogelator. In nonpolar solvents, a blue-fluorescent supramolecular gel was formed upon addition of acid to the E-isomer suspension. The gelation could be reversed by addition of base, and the overall, reversible process could be repeated at least five cycles.
  •  
57.
  • Ricklefs, Robert E, et al. (författare)
  • Avian migration and the distribution of malaria parasites in New World passerine birds
  • 2017
  • Ingår i: Journal of Biogeography. - Wiley-Blackwell. - 0305-0270. ; 44:5, s. 1113-1123
  • Tidskriftsartikel (refereegranskat)abstract
    • Aim: Migrating birds transport their parasites, often over long distances, but little is known about the transfer of these parasites to resident hosts in either the wintering or breeding ranges of the migratory host populations. We investigated the haemosporidian parasite faunas of migratory and resident birds to determine connections among distant parasite faunas, plausibly brought about by migratory host populations. Location: Samples were obtained, primarily during or shortly after the local breeding season, throughout the Americas, from the United States through the Caribbean Basin and into northern South America. Methods: Infections were identified by PCR and sequencing of parasite DNA in avian blood samples. The analyses were based on c. 4700 infections representing 79 parasite lineages of Plasmodium and Haemoproteus spp. Geographical connections of lineages between regions in the Americas were compared to those in the Euro-African migration system, where migration distances are longer for many host species and the migrant and resident avifaunas in the wintering areas are phylogenetically more divergent. Results: Haemosporidian lineages exhibited considerable variation in distribution in the Americas, and patterns of distribution differ markedly between the Americas and the Euro-African migration system. In particular, few lineages were recovered from resident species in both temperate and tropical latitudes, particularly in the Euro-African system, in which a large proportion of lineages were restricted to migrants. Parasite lineages in the Euro-African system exhibited considerable phylogenetic conservatism in their distributions, that is, a tendency of related lineages to exhibit similar geographical distributions. In contrast, clades of parasites in the Americas displayed more geographical diversity, with four of 12 clades exhibiting all four of the distribution types representing the combinations of resident and migrant host species in both temperate and tropical latitudes. Main conclusions: Long-distance migrants connect communities of avian haemosporidian parasites in breeding and wintering areas with disparate avifaunas and different vector communities. The degree of parasite lineage sharing between migrants and residents in breeding and wintering areas appears to reflect, to a large degree, the taxonomic similarity of migrants to the resident species in both areas.
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58.
  • Safari, Reza, et al. (författare)
  • Impedance Matching for VSC-HVDC Damping Controller Gain Selection
  • 2018
  • Ingår i: IEEE Transactions on Power Systems. - IEEE - Institute of Electrical and Electronics Engineers Inc.. - 0885-8950.
  • Tidskriftsartikel (refereegranskat)abstract
    • The impedance matching concept is employed in this paper to select the optimum gain of a VSC-HVDC damping controller. The damping controller of the DC link is based on control of active power in proportion to the difference in local frequency at the VSC-HVDC converter stations. To explain impedance matching, the small-disturbance electro-mechanical dynamics of a power system is transformed to an equivalent LC-circuit. The VSC-HVDC damping controller corresponds to introducing a resistor in the circuit model. Using impedance matching to select resistor value in the circuit model is equivalent to selecting damping controller gain that gives maximum damping ratio. An analytical derivation is conducted for a linearized model of a generic two-area power system, including an expression for the optimum gain. It is also shown how the concept may be employed without a circuit model and that the optimum value is hardly affected by changes in power flow. Then the performance of the proposed approach in multi-mode test systems and with nonlinearities is evaluated using dynamic simulations in DIgSILENT PowerFactory. The results show that impedance matching maximizes the targeted mode damping ratio while non-targeted modes are not negatively impacted.
  •  
59.
  • Safari Tirtashi, Mohammad Reza, et al. (författare)
  • Impedance Matching for VSC-HVDC and Energy Storage Damping Controllers
  • 2018
  • Ingår i: IEEE Transactions on Power Delivery. - IEEE - Institute of Electrical and Electronics Engineers Inc.. - 0885-8977. ; 33:2, s. 1016-1017
  • Tidskriftsartikel (refereegranskat)abstract
    • The small-disturbance electro-mechanical dynamics of a power system can be translated to an equivalent circuit model with inductances and capacitances. Damping control of active power in proportion to local frequency as with a VSC-HVDC link or an energy storage then corresponds to introducing a resistor in the circuit model. This letter shows that impedance matching can be used to select resistor value, and equivalently damping controller gain, that gives maximum damping ratio. It is also shown how the concept is employed without a circuit model.
  •  
60.
  • Svensson, Daniel, et al. (författare)
  • Apolipoprotein A-I attenuates LL-37-induced endothelial cell cytotoxicity
  • 2017
  • Ingår i: Biochemical and Biophysical Research Communications. - Elsevier. - 0006-291X. ; 493:1, s. 71-76
  • Tidskriftsartikel (refereegranskat)abstract
    • The human cathelicidin peptide LL-37 has antimicrobial and anti-biofilm functions, but LL-37 may also damage the host by triggering inflammation and exerting a cytotoxic effect, thereby reducing host cell viability. Human plasma mitigates LL-37-induced host cell cytotoxicity but the underlying mechanisms are not completely understood. Apolipoprotein A-I (ApoA-I) is a plasma protein endowed with atheroprotective effects. Here, we investigate the interaction between ApoA-I and LL-37 by biochemical techniques, and furthermore assess if ApoA-I protects against LL-37-evoked cytotoxicity in human umbilical vein endothelial cells (HUVEC). Our results demonstrated that ApoA-I effectively binds LL-37. The binding of ApoA-I to LL-37 resulted in a structural rearrangement of the protein, but this interaction did not cause lower ApoA-I stability. Recombinant ApoA-I protected against LL-37-induced cytotoxicity in HUVEC and endogenous ApoA-I knockdown in HepG2 cells made the cells more sensitive to LL-37-evoked cytotoxicity. We conclude that ApoA-I physically interacts with LL-37 and antagonizes LL-37-induced down-regulation of endothelial cell viability suggesting that this mechanism counteracts endothelial cell dysfunction.
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  • Resultat 51-60 av 87
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