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Sökning: WFRF:(Johansson V.) > (2015-2019)

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551.
  • Sun, Bing, et al. (författare)
  • Ion transport in polycarbonate based solid polymer electrolytes : experimental and computational investigations
  • 2016
  • Ingår i: Physical Chemistry, Chemical Physics - PCCP. - Royal Society of Chemistry. - 1463-9076 .- 1463-9084. ; 18:14, s. 9504-9513
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Among the alternative host materials for solid polymer electrolytes (SPEs), polycarbonates have recently shown promising functionality in all-solid-state lithium batteries from ambient to elevated temperatures. While the computational and experimental investigations of ion conduction in conventional polyethers have been extensive, the ion transport in polycarbonates has been much less studied. The present work investigates the ionic transport behavior in SPEs based on poly(trimethylene carbonate) (PTMC) and its co-polymer with epsilon-caprolactone (CL) via both experimental and computational approaches. FTIR spectra indicated a preferential local coordination between Li+ and ester carbonyl oxygen atoms in the P(TMC20CL80) co-polymer SPE. Diffusion NMR revealed that the co-polymer SPE also displays higher ion mobilities than PTMC. For both systems, locally oriented polymer domains, a few hundred nanometers in size and with limited connections between them, were inferred from the NMR spin relaxation and diffusion data. Potentiostatic polarization experiments revealed notably higher cationic transference numbers in the polycarbonate based SPEs as compared to conventional polyether based SPEs. In addition, MD simulations provided atomic-scale insight into the structure-dynamics properties, including confirmation of a preferential Li+-carbonyl oxygen atom coordination, with a preference in coordination to the ester based monomers. A coupling of the Li-ion dynamics to the polymer chain dynamics was indicated by both simulations and experiments.</p>
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552.
  • Sun, B., et al. (författare)
  • Ion transport in polycarbonate based solid polymer electrolytes: experimental and computational investigations
  • 2016
  • Ingår i: Physical Chemistry Chemical Physics. - 1463-9084 .- 1463-9076. ; 18:14, s. 9504-9513
  • Tidskriftsartikel (refereegranskat)abstract
    • Among the alternative host materials for solid polymer electrolytes (SPEs), polycarbonates have recently shown promising functionality in all-solid-state lithium batteries from ambient to elevated temperatures. While the computational and experimental investigations of ion conduction in conventional polyethers have been extensive, the ion transport in polycarbonates has been much less studied. The present work investigates the ionic transport behavior in SPEs based on poly(trimethylene carbonate) (PTMC) and its co-polymer with epsilon-caprolactone (CL) via both experimental and computational approaches. FTIR spectra indicated a preferential local coordination between Li+ and ester carbonyl oxygen atoms in the P(TMC20CL80) co-polymer SPE. Diffusion NMR revealed that the co-polymer SPE also displays higher ion mobilities than PTMC. For both systems, locally oriented polymer domains, a few hundred nanometers in size and with limited connections between them, were inferred from the NMR spin relaxation and diffusion data. Potentiostatic polarization experiments revealed notably higher cationic transference numbers in the polycarbonate based SPEs as compared to conventional polyether based SPEs. In addition, MD simulations provided atomic-scale insight into the structure-dynamics properties, including confirmation of a preferential Li+-carbonyl oxygen atom coordination, with a preference in coordination to the ester based monomers. A coupling of the Li-ion dynamics to the polymer chain dynamics was indicated by both simulations and experiments.
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553.
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554.
  • Svensson, Frida, 1979-, et al. (författare)
  • The central exons of the human MUC2 and MUC6 mucins are highly repetitive and variable in sequence between individuals
  • 2018
  • Ingår i: Scientific Reports. - 2045-2322. ; 8
  • Tidskriftsartikel (refereegranskat)abstract
    • The DNA sequence of the two human mucin genes MUC2 and MUC6 have not been completely resolved due to the repetitive nature of their central exon coding for Proline, Threonine and Serine rich sequences. The exact nucleotide sequence of these exons has remained unknown for a long time due to limitations in traditional sequencing techniques. These are still very poorly covered in new whole genome sequencing projects with the corresponding protein sequences partly missing. We used a BAC clone containing both these genes and third generation sequencing technology, SMRT sequencing, to obtain the full-length contiguous MUC2 and MUC6 tandem repeat sequences. The new sequences span the entire repeat regions with good coverage revealing their length, variation in repeat sequences and their internal organization. The sequences obtained were used to compare with available sequences from whole genome sequencing projects indicating variation in number of repeats and their internal organization between individuals. The lack of these sequences has limited the association of genetic alterations with disease. The full sequences of these mucins will now allow such studies, which could be of importance for inflammatory bowel diseases for MUC2 and gastric ulcer diseases for MUC6 where deficient mucus protection is assumed to play an important role.
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555.
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556.
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557.
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558.
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559.
  • Tsuji, Y., et al. (författare)
  • Amplitude modulation of pressure in turbulent boundary layer
  • 2015
  • Ingår i: 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015. - TSFP-9. - 9780000000002
  • Konferensbidrag (refereegranskat)abstract
    • <p>The interaction between large and small scale motions from the point of pressure fluctuation is studied. Using the small pressure probe, both the static pressure and wall pressure fluctuations were measured inside the zeropressure gradient boundary layer at relatively high Reynolds numbers. How the large scales in outside affect the small scales near wall is analyzed by means of statistical method. High amplitude positive and negative pressure fluctuations are also analyzed which associate with coherent motions inside the boundary layer. Another interesting aspect is the amplitude modulations of pressure and this topic is reported in this paper.</p>
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560.
  • Vala, C. H., et al. (författare)
  • Risk for hip fracture before and after total knee replacement in Sweden
  • 2019
  • Ingår i: Osteoporosis International. - 0937-941X.
  • Tidskriftsartikel (refereegranskat)abstract
    • Summary: We studied the risk for hip fracture before and after total knee replacement (TKR) in the entire population in Sweden. Women and men had a low risk for hip fracture before TKR but an increased risk the first year after TKR. Purpose: It is known that osteoarthritis is associated with high bone mass. We therefore studied the risk of hip fracture before and after total knee replacement (TKR), risk of different hip fracture types, and risk subdivided in genders and age groups. Methods: We followed the total Swedish population born between 1902 and 1952 (n = 4,258,934) during the period 1987–2002 and identified all patients with TKR due to primary OA (n = 39,291), and all patients with hip fracture (n = 195,860) in the Swedish National Inpatient Register. The risk time analyses were based on Poisson regression models. Results: The hazard ratio (HR) for hip fracture the last year before TKR was 0.86 (95% CI 0.74 to 1.00) and the first year after 1.26 (95% CI 1.11 to 1.42) compared to individuals without TKR. The HR for femoral neck fracture 0–10 years after TKR was 0.95 (95% CI 0.89 to 1.01) and for trochanteric fracture was 1.13 (95% CI 1.06 to 1.21). The HR for hip fracture in the age group 50–74 was 1.28 (95% CI 1.14 to 1.43) and in the age group 75–90 years was 0.99 (95% CI 0.94 to 1.04) 0–10 years after TKR, compared to individuals without TKR. Conclusion: Individuals had a low risk for hip fracture before TKR but an increased risk the first year after TKR. The risk in individuals below age 75 years and for trochanteric fractures was increased after TKR. Possible explanations include changed knee kinematics after a TKR, physical activity level, fall risk, and other unknown factors.
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