| 11. |
- Birks, HH, et al.
(författare)
-
The Krakenes late-glacial palaeoenvironmental project
- 1996
-
Ingår i: JOURNAL OF PALEOLIMNOLOGY. - : KLUWER ACADEMIC PUBL. ; 15:3
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Krakenes is the site of a small lake on the west coast of Norway that contains a long sequence of late-glacial sediments. The Younger Dryas is well represented, as a cirque glacier developed in the catchment at this time. This site offers unique opportuni
|
|
| 12. |
|
|
| 13. |
|
|
| 14. |
|
|
| 15. |
- Chaudhuri, BN, et al.
(författare)
-
Structures of cellular retinoic acid binding proteins I and II in complex with synthetic retinoids
- 1999
-
Ingår i: ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY. - 0907-4449. ; 55, s. 1850-1857
-
Tidskriftsartikel (refereegranskat)abstract
- Retinoids play important roles in diverse cellular processes including growth, cell differentiation and vision. Many natural and synthetic retinoids are used as drugs in dermatology and oncology. A large amount of data has been accumulated on the cellular activity of different synthetic retinoids. They are stabilized and transported inside the cell cytoplasm by binding and transport proteins, such as cellular retinol-binding proteins and cellular retinoic acid binding proteins (CRABPs). The structures of human CRABP II in complex with two different synthetic retinoids, Ro13-6307 and Ro12--7310 (at 2.1 and 2.0 A resolution, respectively) and of bovine CRABP I in complex with a retinobenzoic acid, Am80 (at 2.8 A resolution) are described. The binding affinities of human CRABP I and II for the retinoids studied here have been determined. All these compounds have comparable binding affinities (nanomolar range) for both CRABPs. Apart from the particular interactions of the carboxylate group of the retinoids with specific protein groups, each structure reveals characteristic interactions. Studying the atomic details of the interaction of retinoids with retinoid-binding proteins facilitates the understanding of the kinetics of retinoid trafficking inside the cytoplasm.
|
|
| 16. |
- Choularton, T. W., et al.
(författare)
-
The Great Dun Fell Cloud Experiment 1993 : An overview
- 1997
-
Ingår i: Atmospheric Environment. - 1352-2310. ; 31:16, s. 2393-2405
-
Tidskriftsartikel (refereegranskat)abstract
- The 1993 Ground-based Cloud Experiment on Great Dun Fell used a wide range of measurements of trace gases, aerosol particles and cloud droplets at five sites to study their sources and sinks especially those in cloud. These measurements have been interpreted using a variety of models. The conclusions add to our knowledge of air pollution, acidification of the atmosphere and the ground, eutrophication and climate change. The experiment is designed to use the hill cap cloud as a flow-through reactor, and was conducted in varying levels of pollution typical of much of the rural temperate continental northern hemisphere in spring-time.
|
|
| 17. |
- Elsner, J., et al.
(författare)
-
Deep acceptors trapped at threading-edge dislocations in GaN
- 1998
-
Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 58:19, s. 12571-12574
-
Tidskriftsartikel (refereegranskat)abstract
- Local-density-functional methods are used to examine the behavior of the oxygen defect, gallium vacancy, and related defect complexes trapped at threading-edge dislocations in GaN. These defects are found to be particularly stable at the core of the dislocation where oxygen sits twofold coordinated in a bridge position. VGa-ON is found to be a deep double acceptor, VGa-(ON)2 is a deep single acceptor, and VGa-(ON)3 at the dislocation core is electrically inactive. We suggest that the first two defects are responsible for a deep acceptor level associated with the midgap yellow luminescence band.
|
|
| 18. |
- Elsner, J., et al.
(författare)
-
Effect of oxygen on the growth of (101‾0) GaN surfaces : The formation of nanopipes
- 1998
-
Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 73:24, s. 3530-3532
-
Tidskriftsartikel (refereegranskat)abstract
- Local density-functional methods are used to examine the behavior of O and O-related defect complexes on the walls of nanopipes in GaN. We find that O has a tendency to segregate to the (10 1̄ 0) surface and identify the gallium vacancy surrounded by three oxygen impurities [VGa-(ON)3] to be a particularly stable and electrically inert complex. We suggest that during Stranski-Krastanow growth, when interisland spaces shrink, these defects reach a critical concentration beyond which further growth is prevented and nanopipes are formed
|
|
| 19. |
- Elsner, J., et al.
(författare)
-
Structural and electrical properties of threading dislocations in GaN
- 1997
-
Ingår i: Defects in semiconductors. - : Trans Tech Publications Inc.. ; , s. 1203-1210
-
Konferensbidrag (refereegranskat)abstract
- The atomic structures and electrical properties for threading screw and threading edge dislocations of wurtzite GaN are calculated within the local-density approximation. Both dislocations are electrically inactive with a band gap free from deep levels. These results are understood to arise from relaxed core structures which are similar to (1010) surfaces. The threading screw dislocations are found to be stable with an open-core whereas the threading edge dislocations possess filled cores.
|
|
| 20. |
- Elsner, J, et al.
(författare)
-
Theory of threading edge and screw dislocations in GaN
- 1997
-
Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 79:19, s. 3672-3675
-
Tidskriftsartikel (refereegranskat)abstract
- The atomic structures, electrical properties, and line energies for threading screw and threading edge dislocations of wurtzite GaN are calculated within the local-density approximation. Both dislocations are electrically inactive with a band gap free from deep levels. These results are understood to arise from relaxed core structures which are similar to (101̅ 0) surfaces.
|
|
