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Sökning: LAR1:uu > Tidskriftsartikel > (1995-2009)

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  • Aabloo, A, et al. (författare)
  • Molecular dynamics simulation of Nd3+ ions in a crystalline PEO surface
  • 1998
  • Ingår i: ELECTROCHIMICA ACTA. - 0013-4686. ; 43:10-11, s. 1361-1364
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Poly(ethylene oxide) based electrolytes are systems in which ionic salts are dissolved into an amorphous EO matrix. Potentials developed earlier to model crystalline and amorphous bulk PEO systems are here used for the MD simulation at 400 K of the behavi
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4.
  • Aabloo, A, et al. (författare)
  • Molecular dynamics simulations of a poly(ethylene oxide) surface
  • 1997
  • Ingår i: POLYMER. - 0032-3861. ; 38:18, s. A47-A51
  • Tidskriftsartikel (refereegranskat)abstract
    • Potentials developed earlier for crystalline and amorphous bulk PEO systems have been used for the MD simulation of a PEO surface model. The surface comprises the outer region of a 122 Angstrom-thick sheet of PEO in which the PEO, -(CH2-CH2-O)(n)- chains
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  • Aagaard, Sunniva M. D., 1977-, et al. (författare)
  • Occurrence and evolutionary origins of polyploids in the club moss genus Diphasiastrum (Lycopodiaceae)
  • 2009
  • Ingår i: Molecular Phylogenetics and Evolution. - : Elsevier BV. - 1055-7903 .- 1095-9513. ; 52:3, s. 746-754
  • Tidskriftsartikel (refereegranskat)abstract
    • Two polyploid taxa are commonly recognized in the genus Diphasiastrum, D. wightianum from Asia and D. zanclophyllum from South Africa and Madagascar. Here we present results from Feulgen DNA image densitometry analyses providing the first evidence for the polyploid origin of D. zanclophyllum. Reported for the first time is also data confirming that D. multispicatum and D. veitchii, representing putative parent lineages for D. wightianum, are diploids. Phylogenetic analyses of nuclear regions RPB2, LEAFY and LAMB4 reveal that putative tetraploid accessions are of allopolyploid origin. Diphasiastrum zanclophyllum shows close relationships to the North American taxon D. digitatum on the maternal side, but the paternal relationship is less clear. Two accessions from Asia, both found to be polyploid, have D. veitchii as maternal parent, whereas the paternal paralogs show relationships to D. multispicatum and D. tristachyum, respectively. None of these parental combinations have previously been hypothesized.
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7.
  • Aagaard, Sunniva M.D. 1977-, et al. (författare)
  • Resolving maternal relationships in the clubmoss genus Diphasiastrum (Lycopodiaceae)
  • 2009
  • Ingår i: Taxon. - 0040-0262 .- 1996-8175. ; 58:3, s. 835-848
  • Tidskriftsartikel (refereegranskat)abstract
    • Diphasiastrum comprises 20-30 species. In addition to a number of species with a circumboreal distribution, several island endemics and putative diploid hybrid species contribute to the diversity of the group. To assess the integrity and relationships of the recognized species, a global phylogeny of Diphasiastrum is constructed using five chloroplast regions comprising ~9000 bp. Six monophyletic groups are identified. Accessions identified as hybrid species cluster in all but one case together with one of its putative parents. Two microsatellite loci are identified, and allelic information combined with sequence information is found diagnostic for the three putative parental taxa in the Central Europe hybrid complexes. Haplotype screening is performed on six Central European populations, from where one or more putative diploid hybrid species have been reported to grow in sympatry with their parent species. The most common parental haplotypes are identified in all populations. Additional intraspecific variation, restricted to single populations, is identified in all sympatric populations at very low frequencies. Taking the low degree of sequence and microsatellite variation into consideration, the acknowledged morphological diversity in Central Europe is probably best explained by phenotypic plasticity, ancestral polymorphisms or relatively recent events of reticulate evolution.
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  • Aalto-Setälä, Katriina, et al. (författare)
  • Genetic risk factors and ischemic cerebrovascular disease : role of common variation of the genes encoding apolipoproteins and angiotensin-converting enzyme
  • 1998
  • Ingår i: Annals of Medicine. - 0785-3890 .- 1365-2060. ; 30:2, s. 224-33
  • Tidskriftsartikel (refereegranskat)abstract
    • DNA polymorphisms in genes encoding apolipoproteins (apo) A-I, C-III, B and E and angiotensin-converting enzyme (ACE) have been proposed to be associated with the risk of coronary artery disease (CAD). We studied whether the same genetic markers would also be associated with the occurrence and extent of atherosclerosis in cervical arteries. DNA samples from 234 survivors of stroke or a transient ischaemic attack aged 60 years or less were examined. The presence of atherosclerosis was assessed using aortic arch angiograms. The SstI polymorphism of apoA-I/C-III gene locus, the XbaI polymorphism of apoB gene, common apoE phenotypes and the insertion/deletion polymorphism of the ACE gene were analysed. The allele frequencies of the apoA-I/C-III, apoB, apoE or ACE gene did not differ between the groups with (n = 148) or without (n = 85) cervical atherosclerosis. However, when patients with at least one apoE4 allele and one X2 allele of apoB were combined and compared with those without either of them (E2E3 or E3E3 and X1X1), a significant association with the presence of cervical atherosclerosis was found (P = 0.03). The patients having the E2E3 phenotype had a significantly elevated serum triglyceride level compared with those with the E3E3 phenotype (P = 0.03). Serum high-density lipoprotein (HDL) cholesterol was lower in the patients with the E2E3 phenotype than in those with the E3E3 and E3E4 (P = 0.01 and P = 0.06, respectively). The apoB or ACE genotypes were not significantly associated with serum lipid or lipoprotein levels. There was no association between the ACE gene polymorphism and the occurrence of hypertension. In conclusion, the interaction of common apoB and apoE alleles may increase the risk of atherosclerosis in cervical arteries.
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