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Sökning: WFRF:(Bader Joel S.)

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1.
  • Mathieu, Roland, et al. (författare)
  • Coexistence of long-ranged charge and orbital order and spin-glass state in single-layered manganites with weak quenched disorder
  • 2007
  • Ingår i: Europhysics letters. - : IOP Publishing. - 0295-5075 .- 1286-4854. ; 80:3, s. 37001-
  • Tidskriftsartikel (refereegranskat)abstract
    • The relationship between orbital and spin degrees of freedom in the single crystals of the hole-doped Pr1-xCa1+xMnO4, 0.3 <= x <= 0.7 has been investigated by means of ac-magnetometry and charge transport. We show that in an intermediate underdoped region, with 0.35 <= x < 0.5, the "orbital-master spin-slave" relationship commonly observed in half-doped manganites does not take place. The long-ranged charge-orbital order is not accompanied by an antiferromagnetic transition at low temperatures, but by a frustrated short-ranged magnetic state bringing forth a spin-glass phase. We discuss in detail the nature and origin of this true spin-glass state, which, as in the half-doped manganites with large quenched disorder, is not related to the macroscopic phase separation observed in crystals with minor defects or impurities.
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3.
  • Rivas-Carrillo, Salvador Daniel, et al. (författare)
  • Broad-scale in silico assessment retroviral exaptated gene : syncytin
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • Syncytin is a fossil protein exapted from retroviruses that fulfills a pivotal role during trophoblast implantation and placental metabolite exchange. However, little is yet known about the distribution of syncytin across vertebrates. Here, we searched a library of more than 150 high-quality assemblies across 17 taxonomical orders for syncytin homologs. We identified and syntenically aligned over 300 loci insertions, including not previously known insertions. Additionally, we predicted the tridimensional structures of the recover sequences using AlphaFold2. Sequence conservation and phylogenomics analyses suggest a complex dynamic of multiple retroviral insertions at different time points with sequence conservation specific to clades that share a similar histo-physiological placental type. This research has widened our knowledge about the physiology of placentation through a better understanding of the evolutionary role of syncytin.
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