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- van Hees, P. A. W., et al.
(författare)
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Modelling low molecular weight organic acid dynamics in forest soils
- 2004
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Ingår i: Soil Biology and Biochemistry. - : Elsevier BV. - 0038-0717 .- 1879-3428. ; 37:3, s. 517-531
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Tidskriftsartikel (refereegranskat)abstract
- Low molecular weight organic acids such as citrate and oxalate have been hypothesized to play a key role in rhizosphere ecology and pedogenesis. A mathematical site-specific model, DYNLOW, was constructed to describe the temporal and spatial dynamics of these organic acids in coniferous forest soils using the modelling software STELLA®. Experimentally derived values for biodegradation, adsorption, and daily values of soil temperature, moisture and hydrological flow were used to parameterize the model. The model describes the dynamics and downward movement of oxalate and citrate through the horizons (O, AE, E, Bhs, Bs) of three podzolic soil profiles in Sweden. After calibration, the model predicted average soil solution organic acid concentrations ranging from <1 to 90 μM, which was in agreement with experimental measurements (<1 to 116 μM). The model results indicated that microbial degradation of organic acids was in quantitative terms the biggest process regulating soil solution concentrations. Primary production rates of organic acid in the soil were predicted to be high (<1 to 1250 nmol g−1 soil d−1) in comparison to the amount present at steady state in the soil solution pool (<0.1 to 240 nmol g−1 soil). The downward transfer of organic acids between soil horizons due to mass flow was predicted to be a small flux (<0.1 to 3% of the total loss) compared to that lost by microbial biodegradation. The model predicted that the amount of basal soil respiration that could be attributable to the microbial turnover of organic acids was on average 19±22% of the basal CO2 production across all sites and horizons for citrate and 7±7% for oxalate. The model results are discussed in the context of pedogenesis, forest soil respiration and organic matter production.
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- Backman, L, et al.
(författare)
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Functional changes in brain activity during priming in Alzheimer's disease
- 2000
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Ingår i: JOURNAL OF COGNITIVE NEUROSCIENCE. - : M I T PRESS. - 0898-929X. ; 12:1, s. 134-141
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Tidskriftsartikel (refereegranskat)abstract
- Patients with Alzheimer's disease (AD) are often impaired on certain forms of implicit memory, such as word-stem completion priming (WSCP). Lesion data suggest that deficient WSCP may be associated with abnormal functioning in the posterior neocortex. Usi
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- Brown, Jeanette S, et al.
(författare)
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Proceedings of the National Institute of Diabetes and Digestive and Kidney Diseases International Symposium on Epidemiologic Issues in Urinary Incontinence in Women.
- 2003
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Ingår i: American journal of obstetrics and gynecology. - 0002-9378. ; 188:6
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Tidskriftsartikel (refereegranskat)abstract
- The Epidemiologic Issues in Urinary Incontinence: Current Databases and Future Collaborations Symposium included an international group of 29 investigators from 10 countries. The purpose of the symposium was to discuss the current understanding and knowledge gaps of prevalence, incidence, associated risk factors, and treatment outcomes for incontinence in women. During the symposium, investigators identified existing large databases and ongoing studies that provide substantive information on specific incontinence research questions. The investigators were able to form an international collaborative research working group and identify potential collaborative projects to further research on the epidemiology of urinary incontinence and bladder dysfunction.
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- Fahlander, Claes, et al.
(författare)
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Excited States in 103Sn: Neutron Single-particle Energies with Respect to 100Sn
- 2001
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Ingår i: Physical Review C (Nuclear Physics). - 0556-2813 .- 1089-490X. ; 63:2
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Tidskriftsartikel (refereegranskat)abstract
- Gamma-ray lines from Sn-103 have been identified for the first time using EUROBALL and ancillary detectors. The level scheme of Sn-103 has been established by means of particle-gated gamma gamma coincidences. The energy spacing between the g(7/2) and d(5/2) neutron single-particle orbitals is determined from the excited states in Sn-103.
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- Goldoni, A., et al.
(författare)
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C-70 adsorbed on Cu(111) : Metallic character and molecular orientation
- 2002
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 116:17, s. 7685-7690
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Tidskriftsartikel (refereegranskat)abstract
- We investigated the interaction of C-70 with the Cu(111) surface using x-ray photoelectron spectroscopy and x-ray absorption spectroscopy. The data point to a net charge transfer from the Cu substrate to the C-70 molecules directly bonded to the Cu atoms, providing a metallic character for a single layer of C-70 (monolayer) adsorbed on this surface. A strong dependence of the x-ray absorption spectra from the light polarization is also observed. By comparing these experimental data with density-functional calculations of the contribution to the x-ray absorption spectral line shape of the five inequivalent carbon atoms in the C-70 cage, we observed that the molecules are mainly oriented with the C5V axis perpendicular to the Cu surface.
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