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- Johansson, Magnus, et al.
(författare)
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Comment on "localized vortices with a semi-integer charge in nonlinear dynamical lattices"
- 2002
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Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - 1539-3755 .- 1550-2376. ; 66:4, s. 048601-
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In a recent paper by Kevrekidis, Malomed, Bishop, and Frantzeskakis [Phys. Rev. E 65, 016605 (2001)] the existence of localized vortices with semi-integer topological charge as exact stationary solutions in a two-dimensional discrete nonlinear Schrödinger model is claimed, as well as the existence of an analog solution in the one-dimensional model. We point out that the existence of such exact stationary solutions would violate fundamental conservation laws, and therefore these claims are erroneous and appear as a consequence of inaccurate numerics. We illustrate the origin of these errors by performing similar numerical calculations using more accurate numerics.
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| 4. |
- Johansson, Magnus, et al.
(författare)
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Development of joint-controlled rock basins in Bohus granite, SW Sweden
- 2001
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Ingår i: Geomorphology. ; 40, s. 145-161
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Tidskriftsartikel (refereegranskat)abstract
- The granite area of Bohuslän along the Swedish west-coast is characterised by an abundance of rock basins of different sizes. Within a 163 km2 large part of the area over 400 basins occur, ranging in size from less than 0.005 km2 up to almost 2 km2. These basins were measured, described and classified from air-photos according to their length, width, area, altitude, shape, boundaries, openness and relation to joint configuration. The depth of basins was collected from digital elevation data. Their distributions and shapes are clearly associated with the visible jointing patterns, as shown by their location along joints or joint intersections, by joint-guided enlargement and similarity between directions of long axis of basins and principal tectonic lineaments in the Bohus granite. The patterns and characteristics of basins suggest that deep selective weathering had been the primary process involved in the origin and evolution of basins. Later they have been reshaped and possibly stripped of saprolites by glacial processes in the Pleistocene. Dating of deep weathering responsible for basin initiation and origin is difficult, although the complex story of Mesozoic weathering, Late Cretaceous burial and Late Tertiary exhumation is not without support
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| 5. |
- Migon, P., et al.
(författare)
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Lithological and structural influence on the development of basin-and-hill landscape within basement complex in SW Sweden
- 2004
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Ingår i: Zeitschrift Fur Geomorphologie N. F. ; 48:03, s. 305-322
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Tidskriftsartikel (refereegranskat)abstract
- This study focuses on structural and lithological controls exerted on landscape development in the basement terrain along the NW coast of Sweden, reflected in morphometric characteristics of medium-size rock-cut basins derived from air photos analysis. In this area fracture patterns have been critical for landform development and the majority of basins has developed along fractures, or at their intersections, or are bounded by fractures. No significant quantitative differences exist between granite and gneiss bedrock, evidently because fracture patterns disregard lithological boundaries. Likewise, intra-lithological variability is best attributed to different patterns of fracturing in each test area. Reasons for the prominence of fracture control probably are sought in morphotectonic setting and limited time span for etching. Despite multiple glaciations, effects of glacial processes are minor at this scale of inquiry
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| 6. |
- Parada, L A, et al.
(författare)
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Cytogenetics of hepatoblastoma: further characterization of 1q rearrangements by fluorescence in situ hybridization: an international collaborative study
- 2000
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Ingår i: Medical and Pediatric Oncology. - 1096-911X. ; 34:3, s. 165-170
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Hepatoblastoma (HBT) is the most common hepatic neoplasm in children. This notwithstanding, little is known about pathogenetic factors, such as genetic abnormalities, of importance for the development and progression of this tumor type. To date, only 33 cytogenetically abnormal HBT have been published, and trisomies for chromosomes 2 and 20 have been shown to be the most frequent aberrations. Recently, unbalanced translocations involving proximal 1q have been described in several HBT, suggesting that a pathogenetically important gene maps to 1q. PROCEDURE: Six primary and one recurrent HBT were cytogenetically analyzed after short-term tissue culture. In addition, fluorescence in situ hybridization (FISH) studies, using locus-specific probes, were performed on three of these pediatric HBT as well as on one previously reported adult HBT. RESULTS: Total or partial trisomy 8, gain of chromosome 20, and structural rearrangements of chromosome 1 were detected in three HBT, and overrepresentation of chromosome 2 material was found in two HBT. The adjacent chromosome bands 1q12 and 1q21 were involved in three translocations, t(1;2), t(1;4), and t(1;11), which were all unbalanced and resulted in gain of 1q material. The previously reported adult HBT displayed 1q deletions with breakpoints at 1q12-21. FISH analyses of the 1q rearrangements revealed that all breakpoints were within the heterochromatic region. CONCLUSIONS: These findings provide further support for the importance of trisomies 2, 8, and 20 and rearrangements of 1q in the development of HBT. Furthermore, the consistent localization of breakpoints within the heterochromatic segment of chromosome 1 suggests that the important pathogenetic consequence of 1q abnormalities is the resulting genomic imbalance rather than a specific gene rearrangement.
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