| 1. |
|
|
| 2. |
- Öjekull, Jenny, 1973, et al.
(författare)
-
Dissociative recombination of H+(H2O)3 and D+(D2O)3 water cluster ions with electrons: Cross sections and branching ratios
- 2007
-
Ingår i: The Journal of chemical physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 127, s. 194301-194309
-
Tidskriftsartikel (refereegranskat)abstract
- Dissociative recombination (DR) of the water cluster ions H+(H2O)3 and D+(D2O)3 with electrons has been studied at the heavy-ion storage ring CRYRING (Manne Siegbahn Laboratory, Stockholm University). For the first time, absolute DR cross sections have been measured for H+(H2O)3 in the energy range of 0.001–0.8 eV, and relative cross sections have been measured for D+(D2O)3 in the energy range of 0.001–1.0 eV. The DR cross sections for H+(H2O)3 are larger than previously observed for H+(H2O)n (n=1,2), which is in agreement with the previously observed trend indicating that the DR rate coefficient increases with size of the water cluster ion. Branching ratios have been determined for the dominating product channels. Dissociative recombination of H+(H2O)3 mainly results in the formation of 3H2O+H (probability of 0.95±0.05) and with a possible minor channel resulting in 2H2O+OH+H2 (0.05±0.05). The dominating channels for DR of D+(D2O)3 are 3D2O+D (0.88±0.03) and 2D2O+OD+D2 (0.09±0.02). The branching ratios are comparable to earlier DR results for H+(H2O)2 and D+(D2O)2, which gave 2X2O+X (X=H,D) with a probability of over 0.9.
|
|
| 3. |
|
|
| 4. |
- Svärd, C., et al.
(författare)
-
Fasting affects the surface and diving metabolic rates of Steller sea lions Eumetopias jubatus
- 2009
-
Ingår i: Aquatic Biology. - Oldenorf/Luhe : Inter-Research. - 1864-7782 .- 1864-7790. ; 8:1, s. 71-82
-
Tidskriftsartikel (refereegranskat)abstract
- Changes in metabolic rates were measured in 3 captive female Steller sea lions Eumetopias jubatus that experienced fasts during summer and winter. We measured metabolic rates (via O2 consumption) before (MRs, surface) and after (DMR, dive + surface interval) the sea lions dove to 10–50 m depths. Measurements were obtained prior to and immediately after 9 to 10 d fasts, and during a 14 d recovery period. The sea lions lost significantly more body mass (Mb) during the winter fast (10.6%), compared with the summer (9.5%). Mass-corrected dive metabolic rate (cDMR = DMR × Mb–0.714) was not affected by dive depth or duration, but increased significantly following the winter fasts (13.5 ± 8.1%), but did not change during summer (–1.1 ± 3.2%). However, mass-corrected surface metabolic rate (cMRs) decreased significantly after both the summer (–16.4 ± 4.7%) and winter (–8.0 ± 9.0%) fasts. Consequently, the ratio between cDMR and cMRs was significantly higher in winter, suggestive of an increased thermal challenge and convective heat loss while diving. Increased cMRs following the fast indicated that digestion began during foraging and was not deferred, implying that access to ingested energy was of higher priority than optimizing diving ability. cDMR was elevated throughout the recovery period, independent of season, resulting in a 12% increase in foraging cost in winter and a 3% increase in summer. Our data suggest that Steller sea lions are more sensitive to changes in body condition due to food shortages in the winter compared with the summer.
|
|
| 5. |
|
|
| 6. |
|
|
| 7. |
- Bjorkman, A, et al.
(författare)
-
Cortical reintegration of a replanted hand and an osseointegrated thumb prosthesis
- 2007
-
Ingår i: Acta Neurochirurgica. Supplementum. - 0065-1419. ; 100, s. 109-112
-
Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Following a peripheral nerve repair the injured nerve has to re-innervate its original cortical area, a process, which is poorly understood. Errors in this cortical re-innervation have been suggested as one key reason for the generally poor clinical outcome following nerve injuries in the hand. METHOD: Functional magnetic resonance imaging (fMRI) was used to assess cortical reintegration following amputation and reattachment of bodyparts in two different situations: a patient with a hand amputation followed by immediate surgical replantation and a patient with an osseointegrated thumb prosthesis. FINDINGS: The primary motor cortex rapidly returns to a normal activation pattern after amputation followed by replantation or application of an osseointegrated prosthesis. The primary somatosenory cortex changes from an initial ipsilateral to a bilateral activation pattern. Sensory stimulation of an osseointegrated prosthesis also shows a bilateral activation pattern in the primary somatosenory cortex. CONCLUSIONS: The primary motor cortex shows a more normal activation pattern possibly because most muscles controlling the hand are proximal to the injury and can be activated after an amputation. The primary somatosensory cortex reorganises more and the activation pattern is more bilateral compared to a healthy hand. This bilateral activation pattern could represent a compensatory mechanism for the inferior tactile function in the replanted hand and the osseointegrated prosthesis.
|
|
| 8. |
- Harutyunyan, Avetik, et al.
(författare)
-
Hidden features of the catalyst nanoparticles favorable for single-walled carbon nanotube growth
- 2007
-
Ingår i: APPLIED PHYSICS LETTERS. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 90:16
-
Tidskriftsartikel (refereegranskat)abstract
- Combining in situ studies of the catalyst activity during single-walled carbon nanotube (SWCNT) growth by mass spectrometry with differential scanning calorimetry and Raman spectroscopy results, the authors expose the favorable features of small catalyst for SWCNT growth and their relationship with synthesis parameters. The sequential introduction of C-12 and C-13 labeled hydrocarbon reveals the influence of catalyst composition on its lifetime and the growth termination path. Ab initio and molecular dynamics simulations corroborate "V"-shape liquidus line of metal-carbon nanoparticle binary phase diagram, which explains observed carbon-induced solid-liquid-solid phase transitions during nanotube growth.
|
|
| 9. |
|
|
| 10. |
|
|
