| 1. |
- Laruelle, G. G., et al.
(författare)
-
Anthropogenic perturbations of the silicon cycle at the global scale: Key role of the land-ocean transition
- 2009
-
Ingår i: Global Biogeochemical Cycles. - 0886-6236 .- 1944-9224. ; 23
-
Forskningsöversikt (refereegranskat)abstract
- Silicon (Si), in the form of dissolved silicate (DSi), is a key nutrient in marine and continental ecosystems. DSi is taken up by organisms to produce structural elements (e.g., shells and phytoliths) composed of amorphous biogenic silica (bSiO(2)). A global mass balance model of the biologically active part of the modern Si cycle is derived on the basis of a systematic review of existing data regarding terrestrial and oceanic production fluxes, reservoir sizes, and residence times for DSi and bSiO(2). The model demonstrates the high sensitivity of biogeochemical Si cycling in the coastal zone to anthropogenic pressures, such as river damming and global temperature rise. As a result, further significant changes in the production and recycling of bSiO(2) in the coastal zone are to be expected over the course of this century.
|
|
| 2. |
- Feuerbacher, M., et al.
(författare)
-
The Samson phase, β-Mg2Al3, Revisited
- 2007
-
Ingår i: Zeitschrift für Kristallographie. - 0044-2968. ; 222:6, s. 259-288
-
Tidskriftsartikel (refereegranskat)
|
|
| 3. |
- Olsson, Christer H. B., et al.
(författare)
-
Bladmögel hotar persiljeodlingen
- 2008
-
Ingår i: Viola: Potatis och Grönsaker. ; 29 Maj 2008:11, s. 18-20
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- På senare år har flera persiljeodlingar i Sverige visat sig vara infekterade med en bladmögel- svamp. Detta, för persilja relativt nya problem, har även upptäckts i många andra europeiska länder.
|
|
| 4. |
- Röllig, M., et al.
(författare)
-
A photon dominated region code comparison study
- 2007
-
Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 467:No. 1 (May III 2007), s. 187-206
-
Tidskriftsartikel (refereegranskat)abstract
- Aims.We present a comparison between independent computer codes, modeling the physics and chemistry of interstellar photon dominated regions (PDRs). Our goal was to understand the mutual differences in the PDR codes and their effects on the physical and chemical structure of the model clouds, and to converge the output of different codes to a common solution.Methods. A number of benchmark models have been created, covering low and high gas densities n = 103,105.5 cm-3 and far ultraviolet intensities $\chi$ = 10, 105 in units of the Draine field (FUV: 6
|
|
| 5. |
- Thi, W. F., et al.
(författare)
-
ISO observation of molecular hydrogen and fine-structure lines in the photodissociation region IC 63
- 2009
-
Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 400:2, s. 622-628
-
Tidskriftsartikel (refereegranskat)abstract
- We wish to constrain the main physical properties of the photodissociation region (PDR) IC63. We present the results of a survey for the lowest pure-rotational lines of H2 with the Short Wavelength Spectrometer and for the major fine-structure cooling lines of OI at 63 and 145μm and CII at 157.7μm with the Long Wavelength Spectrometer on board the Infrared Space Observatory (ISO) in the high-density PDR IC63. The observations are compared with available photochemical models based on optical absorption and/or millimetre emission line data with and without enhanced H2 formation rate on grain surfaces. The cloud density nH is constrained by the fine-structure lines. The models include both collisional excitation and ultraviolet (UV) pumping of the H2 ro-vibrational levels. Molecular pure-rotational lines up to S(5) are detected. The inferred column density of warm H2 at 106 +/- 11K is (5.9 +/- 1.8)+0.9-0.7 × 1021cm-2, while that of the hot component at 685 +/- 68K is (1.2 +/- 0.4) × 1019cm-2. Fine-structure lines are also detected in the far-infrared spectrum of IC63. The fine-structure lines constrain the density of the PDR to be (1-5) × 103cm-3. The impinging UV field on the PDR is enhanced by a factor of 103 compared to the mean interstellar field and is consistent with direct measurements in the UV. PDR models that include an enhanced H2 formation at high dust temperature give higher H2 intensities than models without enhancement. However, the predicted intensities are still lower than the observed intensities.
|
|
| 6. |
- Vuong, Mai Tuyet, et al.
(författare)
-
Genetic variation in the transforming growth factor-beta1 gene is associated with susceptibility to IgA nephropathy
- 2009
-
Ingår i: Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association. - : Oxford University Press (OUP). - 1460-2385 .- 0931-0509. ; 24:10, s. 3061-7
-
Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: There is growing evidence of genetic risk for susceptibility to IgA nephropathy. Among several candidate genes related to immunological regulation in renal tissue, TGFB1 is known to be a contributor to proliferation and the development of fibrosis. METHODS: We analysed several SNPs in a region of this gene using 212 DNA samples from biopsy-proven IgA nephropathy patients, 146 men and 66 women and 477 healthy age-matched controls (321 men and 156 women) from the same population in Sweden. RESULTS: Frequencies of four out of five selected SNPs (rs6957, rs2241715, rs1800471, rs1982073 and rs1800469) were found to significantly differ between male patients and male controls in a co-dominant model (corrected P
|
|
