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Sökning: db:Swepub > (2010-2011) > Södertörns högskola

  • Resultat 1421-1430 av 1728
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1421.
  • Strålfors, Annelie, et al. (författare)
  • The FUN30 Chromatin Remodeler, Fft3, Protects Centromeric and Subtelomeric Domains from Euchromatin Formation
  • 2011
  • Ingår i: PLOS Genetics. - : Public Library of Science (PLoS). - 1553-7390 .- 1553-7404. ; 7:3
  • Tidskriftsartikel (refereegranskat)abstract
    • The chromosomes of eukaryotes are organized into structurally and functionally discrete domains. This implies the presence of insulator elements that separate adjacent domains, allowing them to maintain different chromatin structures. We show that the Fun30 chromatin remodeler, Fft3, is essential for maintaining a proper chromatin structure at centromeres and subtelomeres. Fft3 is localized to insulator elements and inhibits euchromatin assembly in silent chromatin domains. In its absence, euchromatic histone modifications and histone variants invade centromeres and subtelomeres, causing a mis-regulation of gene expression and severe chromosome segregation defects. Our data strongly suggest that Fft3 controls the identity of chromatin domains by protecting these regions from euchromatin assembly.
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1422.
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1423.
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1424.
  • Strøm, Kaare, et al. (författare)
  • Parliamentary democracies under siege?
  • 2011
  • Ingår i: The Madisonian turn. - Ann Arbor : University of Michigan Press. - 0472117475 - 9780472117475 - 9780472035298 ; , s. 3-34
  • Bokkapitel (refereegranskat)
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1425.
  • Strömgren, Tobias, 1978-, et al. (författare)
  • A modelling study of evolving particle-laden turbulent pipe-flow
  • 2011
  • Ingår i: Flow Turbulence and Combustion. - : Springer Science and Business Media LLC. - 1386-6184 .- 1573-1987. ; 86:3-4, s. 477-495
  • Tidskriftsartikel (refereegranskat)abstract
    • An Eulerian turbulent two phase flow model using kinetic theory ofgranular flows for the particle phase was developed in order to studyevolving upward turbulent gas particle flows in a pipe. Themodel takes the feedback of the particles into account and its resultsagree well with experiments. Simulations show that the pipe length required for particle laden turbulent flow to become fully developed is up to five times longer than an unladen flow. To increase theunderstanding of the dependence of the development length on particlediameter a simple model for the expected development length wasderived. It shows that the development length becomes shorter forincreasing particle diameters, which agrees with simulations up to aparticle diameter of 100 μm. Thereafter the development lengthbecomes longer again for increasing particle diameters because largerparticles need a longer time to adjust to the velocity of the carrierphase.
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1426.
  • Strömgren, Tobias, et al. (författare)
  • Deriving fluid-particle correlation closures for Eulerian two-fluid models through use of Langevin equations
  • 2011
  • Ingår i: European journal of mechanics. B, Fluids. - : Elsevier BV. - 0997-7546 .- 1873-7390. ; 30:3, s. 275-280
  • Tidskriftsartikel (refereegranskat)abstract
    • The correlation correlation between the fluctuating particle and gas velocity in isotropic turbulence is studied with a set of stochastic differential equations taking into account both particle-particle collisions and the particle feedback on the turbulence. The principal aim of this work is to use the Langevin equations to formulate closures for two-fluid gas-particle flow models. Using Ito calculus we derived solutions for the turbulent kinetic energy of the particle phase and the particle-gas velocity correlations. If particle-particle collisions and particle feedback on the turbulence are neglected the new relations approach the ones derived by Tchen and Hinze but if these effects are included additional terms in the relations appear. In this study we only use a very simple model for the particle-particle collisions. The new relation and the classical relation of Tchen and Hinze for the particle turbulent kinetic energy as well as a relation based on the kinetic theory of granular flows have been implemented in a two-fluid model for turbulent gas-particle flow in a channel in order to make comparison for different particle Stokes numbers. Results show that while the two-fluid model using Hinze's relations only gives good results for small Stokes numbers, the new relation yields significant improvements for a large range of Stokes numbers.
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1427.
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1428.
  • Ståhlberg, Sabira, et al. (författare)
  • Loplyk Fishermen Ecological Adaptation in the Taklamakan Desert
  • 2010
  • Ingår i: Anthropos. - 0257-9774. ; 105:2, s. 423-439
  • Tidskriftsartikel (refereegranskat)abstract
    • The Loplyks form a small ethnic group previously settled at the Lop Lake (Lop Nor) in the Tarim Basin. With an economy based on fishing, this semi-nomadic Turkic group adapted to the arid conditions and scarce biological resources at the fringe of the Taklamakan desert. In the late nineteenth century, foreign travellers observed that they could fulfil most of their material needs through the use of available plants, animals, and fish species. Anthropogenic pressure and climate change have dried Lop Nor and forced the Loplyks to turn into farmers. This article discusses their adaptation strategies from an ethnobiological viewpoint.
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1429.
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1430.
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