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  • 1
    Electronic Resource
    Electronic Resource
    Contrasting patterns of genetic diversity in two tropical pines: Pinus kesiya (Royle ex Gordon) and P. merkusii (Jungh et De Vriese) (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 436-441 
    Details
    ISSN: 1432-2242
    Keywords: Key words  Pinus ; Allozymes ; Chloroplast DNA ; Genetic variation ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract   We studied allozyme and chloroplast (cp) DNA variation in natural populations of Pinus kesiya and P. merkusii from Thailand and Vietnam. The results showed striking differences between the two species in the amount and distribution of allozyme variation. P. kesiya harboured considerable allozyme variation and showed weak interpopulational differentiation. In contrast, P. merkusii had very low intrapopulational variability but a high level of interpopulational differentiation. The average Nei's genetic distance separating the two species was exceptionally high (0.701) taking into account their close taxonomic placement in the same subsection Sylvestres. The constructed phylogenetic trees revealed very early divergence of P. kesiya and P. merkusii. The present analysis of cpDNA variation also confirmed the dissimilar character of these two species and was compatible with other evidence indicating the outstanding position of P. merkusii as compared to other Asian members of the subsection Sylvestres. Analysis of cpDNA variation in sympatric populations of P. kesiya and P. merkusii revealed that they are pure representatives of the species in question. This result indicates that despite an overlapping distribution P. kesiya and P. merkusii do not hybridise in nature. We suggest that the distinctive character of P. merkusii is a result of an early separation from other Eurasian pines. Despite spatial proximity, P. kesiya and P. merkusii are kept apart by strong reproductive barriers. The low genetic variability of P. merkusii may be explained by previous bottlenecks, reduced gene flow among populations, and an inbreeding due to small population size and asynchronous flowering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050146
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  • 2
    Electronic Resource
    Electronic Resource
    Evolutionary analysis of Pinus densata Masters, a putative Tertiary hybrid (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 635-640 
    Details
    ISSN: 1432-2242
    Keywords: Pinus ; Species hybridization ; Allozymes ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Allozyme differentiation at 13 loci was studied in populations of Pinus tabulaeformis, P. densata, and P. yunnanensis from China. It was previously suggested that P. densata represents a Tertiary hybrid between P. tabulaeformis and P. yunnanensis. The observed levels of allozyme variation within and among the investigated species were comparable to those of other conifers. P. tabulaeformis differed markedly from P. yunnanensis with respect to allozyme frequencies, while P. densata was intermediate between the two putative parents. There was evidence of homozygote excess in embryos from all investigated species, as compared to Hardy-Weinberg expectations. The observed allozyme composition of P. densata conformed to earlier morphological and molecular evidence indicating hybrid origin of this taxon. It was proposed that fusion of gene pools from P. tabulaeformis and P. yunnanensis has led to adaptive evolution of a new species, P. densata.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224223
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  • 3
    Electronic Resource
    Electronic Resource
    Evolutionary analysis of Pinus densata (Masters), a putative Tertiary hybrid. (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 641-647 
    Details
    ISSN: 1432-2242
    Keywords: Pinus ; Species hybridization ; Chloroplast DNA ; Molecular markers ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Restriction fragment analysis and heterologous hybridization of chloroplast (cp) DNA was used to develop species-specific markers for P. tabulaeformis, P. yunnanensis and P. massoniana. Fragment patterns created by the BclI and DraI restriction enzymes and hybridization patterns to the psbC and psbD probes were distinctive among the three species. No intraspecific variation was detected with respect to any of the cpDNA markers developed in this study. The cpDNA markers obtained were subsequently used to examine the parentage of P. densata, a putative Tertiary hybrid between P. tabulaeformis and P. yunnanensis. The analysis demonstrated for the first time that P. densata populations accommodate chloroplast genomes of P. tabulaeformis and P. yunnanensis, which strongly supports earlier suggestions of the hybrid origin of this species. It appears that P. densata represents a stabilized natural hybrid that has become adapted to high mountain environments where neither of the parental species can normally grow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224224
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular systematics and genetic differentiation of Pinus sylvestris (L.) and P. densiflora (Sieb. et Zucc.) (1993)
    Springer
    Theoretical and applied genetics 86 (1993), S. 159-165 
    Details
    ISSN: 1432-2242
    Keywords: Allozymes ; Chloroplast DNA ; Introgression ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Allozyme variation was examined in 22 populations of Pinus densiflora (Sieb, et Zucc.) and four geographic varieties of P. sylvestris (L.): var ‘lapponica’ (Fries, Hartman), var ‘armena’ (Komarov), var ‘mongolica’ (Litvinov) and var ‘sylvestriformis’ (Takenouchi). In addition, we developed paternal chloroplast (cp) DNA markers that distinguish P. densiflora from var ‘lapponica’, var ‘armena’ and var ‘mongolica’. UPGMA cluster analysis based on Nei's distances between all pairwise combinations of the 22 populations revealed patterns corresponding strictly to geographic origin and taxonomic status. Analysis of allozyme variation in var ‘lapponica’, var ‘armena’ and var ‘mongolica’ demonstrated a high level of intrapopulational variability but a low level of interpopulational differentiation. It appears that the late Pleistocene blending of genetically diverse populations was responsible for the observed variation patterns. The constructed phylogenetic trees also showed late divergence of these three varieties. The var ‘sylvestri formis’ was genetically distinct from the other three P. sylvestris varieties. The genetic distances separating var ‘sylvestriformis’ from P. densiflora and the other taxa lend support to a separate taxonomic status for var ‘sylvestriformis’ and a close relation with P. densiflora. We found that var ‘sylvestriformis’ harbors admixtures of allozymes and cpDNA from both P. sylvestris and P. densiflora, which suggests an introgressive nature of this variety. Levels of intrapopulational variability were similar in P. sylvestris and P. densiflora, but interpopulational differentiation was much higher in P. densiflora. In the constructed phylogenetic trees, populations of this species were characterized by relatively long internode distances and branch lengths. The present results suggest that P. densiflora has a more advanced evolutionary age than P. sylvestris.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222074
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  • 5
    Electronic Resource
    Electronic Resource
    Contrasting patterns of genetic diversity in two tropical pines: Pinus kesiya (Royle ex Gordon) and P. merkusii (Jungh et De Vriese) (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 436-441 
    Details
    ISSN: 1432-2242
    Keywords: Pinus ; Allozymes ; Chloroplast DNA ; Genetic variation ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We studied allozyme and chloroplast (cp) DNA variation in natural populations of Pinus kesiya and P. merkusii from Thailand and Vietnam. The results showed striking differences between the two species in the amount and distribution of allozyme variation. P. kesiya harboured considerable allozyme variation and showed weak interpopulational differentiation. In contrast, P. merkmii had very low intrapopulational variability but a high level of interpopulational differentiation. The average Nei's genetic distance separating the two species was exceptionally high (0.701) taking into account their close taxonomic placement in the same subsection Sylvestres. The constructed phylogenetic trees revealed very early divergence of P. kesiya and P. merkusii. The present analysis of cpDNA variation also confirmed the dissimilar character of these two species and was compatible with other evidence indicating the outstanding position of P. merkusii as compared to other Asian members of the subsection Sylvestres. Analysis of cpDNA variation in sympatric populations of P. kesiya and P. merkusii revealed that they are pure representatives of the species in question. This result indicates that despite an overlapping distribution P. kesiya and P. merkusii do not hybridise in nature. We suggest that the distinctive character of P. merkusii is a result of an early separation from other Eurasian pines. Despite spatial proximity, P. kesiya and P. merkusii are kept apart by strong reproductive barriers. The low genetic variability of P. merkusii may be explained by previous bottlenecks, reduced gene flow among populations, and an inbreeding due to small population size and asynchronous flowering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223690
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  • 6
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    Strong coupling of Sm and Fe magnetism in SmFeAsO as revealed by magnetic x-ray scattering (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-08-06
    Description: Author(s): S. Nandi, Y. Su, Y. Xiao, S. Price, X. F. Wang, X. H. Chen, J. Herrero-Martín, C. Mazzoli, H. C. Walker, L. Paolasini, S. Francoual, D. K. Shukla, J. Strempfer, T. Chatterji, C. M. N. Kumar, R. Mittal, H. M. Rønnow, Ch. Rüegg, D. F. McMorrow, and Th. Brückel The magnetic structures adopted by the Fe and Sm sublattices in SmFeAsO have been investigated using element-specific x-ray resonant and nonresonant magnetic scattering techniques. Between 110 and 5 K, the Sm and Fe moments are aligned along the c and a directions, respectively, according to the sam... [Phys. Rev. B 84, 054419] Published Fri Aug 05, 2011
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    Tunable interface strain coupling and its impact on the electronic transport and magnetic properties of La_{0.5}Ca_{0.5}MnO_{3}/Pb(In_{1/2}Nb_{1/2})O_{3}-Pb(Mg_{1/3}Nb_{2/3})O_{3}-PbTiO_{3} multiferroic heterostructures (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-12-23
    Description: Author(s): M. Zheng, M. M. Yang, Q. X. Zhu, X. Y. Li, G. Y. Gao, R. K. Zheng, Y. Wang, X. M. Li, X. Shi, H. S. Luo, and X. G. Li A comprehensive understanding of strain coupling across heterointerfaces and its impact on physical properties of oxide heterostructures is important for elucidating the mechanisms of certain novel physical phenomena occurring at heterointerfaces, such as magnetoelectric coupling, tunneling electror... [Phys. Rev. B 90, 224420] Published Mon Dec 22, 2014
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Twisted skyrmions at domain boundaries and the method of image skyrmions (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-07-28
    Description: Author(s): Huanhuan Yang, C. Wang, Xiaofan Wang, X. S. Wang, Yunshan Cao, and Peng Yan We predict a twisted skyrmion structure at the boundary of two antiparallel magnetic domains stabilized by a (synthetic or crystal) antiferromagnetic coupling on the border. Through this novel state, skyrmions with opposite polarities can be freely switched between each other by spin-polarized elect... [Phys. Rev. B 98, 014433] Published Fri Jul 27, 2018
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    High-field phase diagram and phase transitions in hexagonal manganite $\mathrm{ErMn}{\mathrm{O}}_{3}$ (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-06-16
    Description: Author(s): Y. J. Liu, J. F. Wang, X. F. Sun, J.-S. Zhou, Z. C. Xia, Z. W. Ouyang, M. Yang, C. B. Liu, R. Chen, J.-G. Cheng, Y. Kohama, M. Tokunaga, and K. Kindo We report high-field magnetization study on the complex spin system h − ErMn O 3 and propose an explanation for the c -axis phase transitions observed at 0.8, 12, and 28 T based on an analysis of the magnetization jumps, the complete H − T phase diagram and the irreducible representations of the E r 3 + ( 2 a a... [Phys. Rev. B 97, 214419] Published Fri Jun 15, 2018
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    Novel half-magnetization plateau and nematiclike transition in the $S=1$ skew chain ${\mathrm{Ni}}_{2}{\mathrm{V}}_{2}{\mathrm{O}}_{7}$ (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-04-12
    Description: Author(s): Z. W. Ouyang, Y. C. Sun, J. F. Wang, X. Y. Yue, R. Chen, Z. X. Wang, Z. Z. He, Z. C. Xia, Y. Liu, and G. H. Rao A quantized magnetization plateau is usually not expected when a classic spin-flop transition occurs in a low-dimensional antiferromagnet. Here, we report an experimental observation of a spin-flop transition followed by a wide half-magnetization plateau in the S = 1 skew-chain system Ni 2 V 2 O 7 . This pl... [Phys. Rev. B 97, 144406] Published Wed Apr 11, 2018
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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