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Sökning: WFRF:(Oradd G)

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  • Adebahr, J, et al. (författare)
  • Ion and solvent dynamics in gel electrolytes based on ethylene oxide grafted acrylate polymers
  • 2002
  • Ingår i: The Journal of Physical Chemistry Part B. - : The American Chemical Society (ACS). - 1520-5207 .- 1089-5647. ; 106:47, s. 12119-12123
  • Tidskriftsartikel (refereegranskat)abstract
    • Multinuclear pulsed field gradient NMR measurements and theological viscosity measurements were performed on three series of polymer gel electrolytes. The gels were based on a lithium salt electrolyte swollen into a copolymer matrix comprising an acrylate backbone and ethylene oxide side chains. In each series the side chains differed in length and number, but the acrylate-to-ethylene oxide ratio was kept constant. It was found that the self-diffusion coefficient of the cations was much lower than that of the anions, and that it decreased rapidly when the side chains got longer. In contrast, the self-diffusion coefficient of the anions was found to be independent of chain length. In the gel electrolytes, the diffusion coefficients of the solvent molecules are relatively constant despite an increased viscosity with increasing length of the side chains. However, in saltfree gels made for comparison, the diffusion coefficients of the solvent molecules decreased with, increasing length of the side chains, which is consistent with an increased viscosity.
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3.
  • Karalija, Nina, 1984-, et al. (författare)
  • Cardiovascular factors are related to dopamine integrity and cognition in aging
  • 2019
  • Ingår i: Annals of Clinical and Translational Neurology. - : Wiley-Blackwell. - 2328-9503. ; 6:11, s. 2291-2303
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective: The aging brain undergoes several changes, including reduced vascular, structural, and dopamine (DA) system integrity. Such brain changes have been associated with age‐related cognitive deficits. However, their relative importance, interrelations, and links to risk factors remain elusive.Methods: The present work used magnetic resonance imaging and positron emission tomography with 11C‐raclopride to jointly examine vascular parameters (white‐matter lesions and perfusion), DA D2‐receptor availability, brain structure, and cognitive performance in healthy older adults (n = 181, age: 64–68 years) from the Cognition, Brain, and Aging (COBRA) study.Results: Covariance was found among several brain indicators, where top predictors of cognitive performance included caudate and hippocampal integrity (D2DR availability and volumes), and cortical blood flow and regional volumes. White‐matter lesion burden was negatively correlated with caudate DA D2‐receptor availability and white‐matter microstructure. Compared to individuals with smaller lesions, individuals with confluent lesions (exceeding 20 mm in diameter) had reductions in cortical and hippocampal perfusion, striatal and hippocampal D2‐receptor availability, white‐matter microstructure, and reduced performance on tests of episodic memory, sequence learning, and processing speed. Higher cardiovascular risk as assessed by treatment for hypertension, systolic blood pressure, overweight, and smoking was associated with lower frontal cortical perfusion, lower putaminal D2DR availability, smaller grey‐matter volumes, a larger number of white‐matter lesions, and lower episodic memory performance.Interpretation: Taken together, these findings suggest that reduced cardiovascular health is associated with poorer status for brain variables that are central to age‐sensitive cognitive functions, with emphasis on DA integrity.
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  • Gorbach, Tetiana, et al. (författare)
  • Longitudinal association between hippocampus atrophy and episodic-memory decline
  • 2017
  • Ingår i: Neurobiology of Aging. - 0197-4580 .- 1558-1497. ; 51, s. 167-176
  • Tidskriftsartikel (refereegranskat)abstract
    • There is marked variability in both onset and rate of episodic-memory decline in aging. Structural magnetic resonance imaging studies have revealed that the extent of age-related brain changes varies markedly across individuals. Past studies of whether regional atrophy accounts for episodic-memory decline in aging have yielded inconclusive findings. Here we related 15-year changes in episodic memory to 4-year changes in cortical and subcortical gray matter volume and in white-matter connectivity and lesions. In addition, changes in word fluency, fluid IQ (Block Design), and processing speed were estimated and related to structural brain changes. Significant negative change over time was observed for all cognitive and brain measures. A robust brain-cognition change-change association was observed for episodic-memory decline and atrophy in the hippocampus. This association was significant for older (65-80 years) but not middle-aged (55-60 years) participants and not sensitive to the assumption of ignorable attrition. Thus, these longitudinal findings highlight medial-temporal lobe system integrity as particularly crucial for maintaining episodic-memory functioning in older age. 
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  • Oradd, G, et al. (författare)
  • Intermediate phases in the system egg lecithin/CTAC/brine. SAXS and NMR studies
  • 2001
  • Ingår i: LANGMUIR. - : AMER CHEMICAL SOC. - 0743-7463. ; 17:11, s. 3227-3234 Language: English
  • Tidskriftsartikel (refereegranskat)abstract
    • The phase behavior and phase structures in the pseudo ternary system egg lecithin (EPC)/ cetyltrimethylammonium chloride/brine (100 mM NaCl) have been investigated by H-2 and P-31 NMR spectroscopy and small-angle X-ray diffraction (SAXS). At solvent conte
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8.
  • Wang, K, et al. (författare)
  • Phase behavior and phase structure of a cationic fluorosurfactant in water
  • 2000
  • Ingår i: LANGMUIR. - : AMER CHEMICAL SOC. - 0743-7463. ; 16:3, s. 1042-1049 Language: English
  • Tidskriftsartikel (refereegranskat)abstract
    • The phase behavior of the cationic fluorocarbon surfactant 1,1,2,2-tetrahydroperfluorodecylpyridinium chloride in water has been studied using small-angle X-ray and H-2 NMR spectroscopy as the main techniques. The following phase sequence was found: micel
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  • Resultat 1-8 av 8

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