| 1. |
- Monteverde, M, et al.
(författare)
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Fluorinated Hg-1223 under pressure : the ultimate Tc of the cuprates?
- 2004
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Ingår i: Physica. C, Superconductivity. - : Elsevier B.V. - 0921-4534 .- 1873-2143. ; 408-410, s. 23-24
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Tidskriftsartikel (refereegranskat)abstract
- High pressure experiments have revealed that Tc is affected by two main pressure-dependent parameters: the doping level of the CuO2 planes and by an intrinsic factor. The origin of the intrinsic factor is still unclear as, depending on the experiment, it is associated with the reduction of the c or the a lattice parameters. F incorporation into the Hg-1223 structure yields an enhancement of Tc up to a susceptibility onset of 138 K, mainly related to a compression of the a crystallographic axis. We have obtained a new high Tc record (166 K ± 1.5 K) by applying pressure (23 GPa) in the fluorinated Hg-1223 superconductor optimally doped. Tc increases with increasing pressure, reaching different maximum values, depending on the F doping level, and decreases for a further increase of pressure. This saturation of Tc may be the highest Tc that can be obtained for the cuprates, considering the particular structural characteristics of this system.
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| 2. |
- Pedersen, K., Zavialov, A., Pavlov, M., Elf, J., Gerdes, K. and Ehrenberg, M.
(författare)
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The bacterial toxin RelE displays codon specific cleavage of mRNAs in the ribosomal A-site.
- 2003
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Ingår i: Cell. ; 112, s. 131-140
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Tidskriftsartikel (refereegranskat)
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| 3. |
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| 4. |
- Zhenyu Gu, Weidenhaupt, M, Ivanova, I, Pavlov, M, Xu, B, Zhi-Guo, S and Jansson, J-C
(författare)
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Chromoatographic Methods for the Insolation of, and Refolding of Proteins forms, Escherichia coli Inclusion Bodies
- 2002
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Ingår i: journal. - : Protein expression and purification. ; 25, s. 174-179
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Tidskriftsartikel (refereegranskat)
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| 5. |
- Alexanderson, Helena, et al.
(författare)
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Depositional history of the North Taymyr ice-marginal zone, Siberia - a landsystem approach
- 2002
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Ingår i: Journal of Quaternary Science. - : Wiley. - 1099-1417 .- 0267-8179. ; 17:4, s. 361-382
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Tidskriftsartikel (refereegranskat)abstract
- The sediment-landform associations of the northern Taymyr Peninsula in Arctic Siberia tell a tale of ice sheets advancing from the Kara Sea shelf and inundating the peninsula, probably three times during the Weichselian. In each case the ice sheet had a margin frozen to its bed and an interior moving over a deforming bed. The North Taymyr ice-marginal zone (NTZ) comprises ice-marginal and supraglacial landsystems dominated by thrust-block moraines 2-3 km wide and large-scale deformation of sediments and ice. Large areas are still underlain by remnant glacier ice and a supraglacial landscape with numerous ice-walled lakes and kames is forming even today. The proglacial landsystem is characterised by subaqueous (e.g. deltas) or terrestrial (e.g. sandar) environments, depending on location/altitude and time of formation. Dating results (OSL, C-14) indicate that the NTZ was initiated ca. 80 kyr BP during the retreat of the Early Weichselian ice sheet and that it records the maximum limit of a Middle Weichselian glaciation (ca. 65 kyr BP). During both these events, proglacial lakes were dammed by the ice sheets. Part of the NTZ was occupied by a thin Late Weichselian ice sheet (20-12 kyr BP), resulting in subaerial proglacial drainage. Copyright (C) 2002 John Wiley Sons, Ltd.
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| 6. |
- Alexanderson, Helena, et al.
(författare)
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The north Taymyr ice-marginal zone, arctic Siberia—a preliminary overview and dating
- 2001
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Ingår i: Global and Planetary Change. - 1872-6364. ; 31:1, s. 427-445
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Tidskriftsartikel (refereegranskat)abstract
- he North Taymyr ice-marginal zone (NTZ) is a complex of glacial, glaciofluvial and glaciolacustrine deposits, laid down on the northwestern Taymyr Peninsula in northernmost Siberia, along the front of ice sheets primarily originating on the Kara Sea shelf. It was originally recognised from satellite radar images by Russian scientists; however, before the present study, it had not been investigated in any detail. The ice sheets have mainly inundated Taymyr from the northwest, and the NTZ can be followed for 700-750 km between 75 degrees N and 77 degrees N, mostly 80-100 km inland from the present Kara Sea coast. The ice-marginal zone is best developed in its central parts, ca. 100 km on each side of the Lower Taymyr River, and has there been studied by us in four areas. In two of these, the ice sheet ended on land, whereas in the two others, it mainly terminated into ice-dammed lakes. The base of the NTZ is a series of up to 100-m-high and 2-km-wide ridges, usually consisting of redeposited marine silts. These ridges are still to a large extent ice-cored; however, the present active layer rarely penetrates to the ice surface. Upon these main ridges, smaller ridges of till and glaciofluvial material are superimposed. Related to these are deltas corresponding to two generations of ice-dammed lakes, with shore levels at 120-140 m and ca. 80 m a.s.l. These glacial lakes drained southwards, opposite to the present-day pattern, via the Taymyr River valley into the Taymyr Lake basin and, from there, most probably westwards to the southern Kara Sea shelf. The basal parts of the NTZ have not been dated; however, OSL dates of glaciolacustrine deltas indicate an Early-Middle Weichselian age for at least the superimposed ridges. The youngest parts of the NTZ are derived from a thin ice sheet (less than 300 m thick near the present coast) inundating the lowlands adjacent to the lower reaches of the Taymyr River. The glacial ice from this youngest advance is buried under only ca. 0.5 m of melt-out till and is exposed by hundreds of shallow slides. This final glaciation is predated by glacially redeposited marine shells aged ca. 20,000 BP ( (super 14) C) and postdated by terrestrial plant material from ca. 11,775 and 9500 BP ( (super 14) C)-giving it a last global glacial maximum (LGM; Late Weichselian) age.
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