| 1. |
- Hurt, Aeron C., et al.
(författare)
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Evidence for the Introduction, Reassortment, and Persistence of Diverse Influenza A Viruses in Antarctica
- 2016
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Ingår i: Journal of Virology. - 0022-538X .- 1098-5514. ; 90:21, s. 9674-9682
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Tidskriftsartikel (refereegranskat)abstract
- Avian influenza virus (AIV) surveillance in Antarctica during 2013 revealed the prevalence of evolutionarily distinct influenza viruses of the H11N2 subtype in Adelie penguins. Here we present results from the continued surveillance of AIV on the Antarctic Peninsula during 2014 and 2015. In addition to the continued detection of H11 subtype viruses in a snowy sheathbill during 2014, we isolated a novel H5N5 subtype virus from a chinstrap penguin during 2015. Gene sequencing and phylogenetic analysis revealed that the H11 virus detected in 2014 had a >99.1% nucleotide similarity to the H11N2 viruses isolated in 2013, suggesting the continued prevalence of this virus in Antarctica over multiple years. However, phylogenetic analysis of the H5N5 virus showed that the genome segments were recently introduced to the continent, except for the NP gene, which was similar to that in the endemic H11N2 viruses. Our analysis indicates geographically diverse origins for the H5N5 virus genes, with the majority of its genome segments derived from North American lineage viruses but the neuraminidase gene derived from a Eurasian lineage virus. In summary, we show the persistence of AIV lineages in Antarctica over multiple years, the recent introduction of gene segments from diverse regions, and reassortment between different AIV lineages in Antarctica, which together significantly increase our understanding of AIV ecology in this fragile and pristine environment.
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| 2. |
- Karabulut, Elife, et al.
(författare)
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Phase diagram of a rapidly rotating two-component Bose gas
- 2013
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Ingår i: Physical Review A (Atomic, Molecular and Optical Physics). - 1050-2947. ; 87:4
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Tidskriftsartikel (refereegranskat)abstract
- We derive analytically the phase diagram of a two-component Bose gas confined in an anharmonic potential, which becomes exact and universal in the limit of weak interactions and small anharmonicity of the trapping potential. The transitions between the different phases, which consist of vortex states of single and multiple quantization, are all continuous because of the addition of the second component. DOI: 10.1103/PhysRevA.87.043609
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| 3. |
- Karabulut, Elife, et al.
(författare)
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Rotational properties of nondipolar and dipolar Bose-Einstein condensates confined in annular potentials
- 2013
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Ingår i: Physical Review A (Atomic, Molecular and Optical Physics). - 1050-2947. ; 87:3
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Tidskriftsartikel (refereegranskat)abstract
- We investigate the rotational response of both nondipolar and dipolar Bose-Einstein condensates confined in an annular potential via minimization of the energy in the rotating frame. For the nondipolar case we identify certain phases which are associated with different vortex configurations. For the dipolar case, assuming that the dipoles are aligned along some arbitrary and tunable direction, we study the same problem as a function of the orientation angle of the dipole moment of the atoms. DOI: 10.1103/PhysRevA.87.033615
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| 4. |
- Malet, F., et al.
(författare)
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Density-Functional Theory for Strongly Correlated Bosonic and Fermionic Ultracold Dipolar and Ionic Gases
- 2015
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Ingår i: Physical Review Letters. - 1079-7114. ; 115:3
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Tidskriftsartikel (refereegranskat)abstract
- We introduce a density functional formalism to study the ground-state properties of strongly correlated dipolar and ionic ultracold bosonic and fermionic gases, based on the self-consistent combination of the weak and the strong coupling limits. Contrary to conventional density functional approaches, our formalism does not require a previous calculation of the interacting homogeneous gas, and it is thus very suitable to treat systems with tunable long-range interactions. Because of its asymptotic exactness in the regime of strong correlation, the formalism works for systems in which standard mean-field theories fail.
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