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  • 1
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    Galaxy And Mass Assembly (GAMA) blended spectra catalogue: strong galaxy-galaxy lens and occulting galaxy pair candidates (2015)
    Oxford University Press
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    Publication Date: 2015-04-15
    Description: We present the catalogue of blended galaxy spectra from the Galaxy And Mass Assembly (GAMA) survey. These are cases where light from two galaxies are significantly detected in a single GAMA fibre. Galaxy pairs identified from their blended spectrum fall into two principal classes: they are either strong lenses, a passive galaxy lensing an emission-line galaxy; or occulting galaxies, serendipitous overlaps of two galaxies, of any type. Blended spectra can thus be used to reliably identify strong lenses for follow-up observations (high-resolution imaging) and occulting pairs, especially those that are a late-type partly obscuring an early-type galaxy which are of interest for the study of dust content of spiral and irregular galaxies. The GAMA survey setup and its autoz automated redshift determination were used to identify candidate blended galaxy spectra from the cross-correlation peaks. We identify 280 blended spectra with a minimum velocity separation of 600 km s –1 , of which 104 are lens pair candidates, 71 emission-line-passive pairs, 78 are pairs of emission-line galaxies and 27 are pairs of galaxies with passive spectra. We have visually inspected the candidates in the Sloan Digital Sky Survey (SDSS) and Kilo Degree Survey (KiDS) images. Many blended objects are ellipticals with blue fuzz ( Ef in our classification). These latter ‘Ef’ classifications are candidates for possible strong lenses, massive ellipticals with an emission-line galaxy in one or more lensed images. The GAMA lens and occulting galaxy candidate samples are similar in size to those identified in the entire SDSS. This blended spectrum sample stands as a testament of the power of this highly complete, second-largest spectroscopic survey in existence and offers the possibility to expand e.g. strong gravitational lens surveys.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 2
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    The genetic program for cartilage development has deep homology within Bilateria (2016)
    Nature Publishing Group (NPG)
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    Publication Date: 2016-04-26
    Description: The evolution of novel cell types led to the emergence of new tissues and organs during the diversification of animals. The origin of the chondrocyte, the cell type that synthesizes cartilage matrix, was central to the evolution of the vertebrate endoskeleton. Cartilage-like tissues also exist outside the vertebrates, although their relationship to vertebrate cartilage is enigmatic. Here we show that protostome and deuterostome cartilage share structural and chemical properties, and that the mechanisms of cartilage development are extensively conserved--from induction of chondroprogenitor cells by Hedgehog and beta-catenin signalling, to chondrocyte differentiation and matrix synthesis by SoxE and SoxD regulation of clade A fibrillar collagen (ColA) genes--suggesting that the chondrogenic gene regulatory network evolved in the common ancestor of Bilateria. These results reveal deep homology of the genetic program for cartilage development in Bilateria and suggest that activation of this ancient core chondrogenic network underlies the parallel evolution of cartilage tissues in Ecdysozoa, Lophotrochozoa and Deuterostomia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tarazona, Oscar A -- Slota, Leslie A -- Lopez, Davys H -- Zhang, GuangJun -- Cohn, Martin J -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 May 5;533(7601):86-9. doi: 10.1038/nature17398. Epub 2016 Apr 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, UF Genetics Institute, University of Florida, PO Box 103610, Gainesville, Florida 32610, USA. ; Department of Biology, University of Florida, PO Box 103610, Gainesville, Florida 32610, USA. ; Department of Molecular Genetics and Microbiology, University of Florida College of Medicine, PO Box 103610, Gainesville, Florida 32610, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27111511" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cartilage/anatomy & histology/embryology/metabolism ; Chondrocytes/cytology ; Chondrogenesis/*genetics ; Conserved Sequence/*genetics ; Decapodiformes/cytology/embryology/genetics/metabolism ; *Evolution, Molecular ; Fibrillar Collagens/genetics ; Gene Expression Regulation, Developmental/*genetics ; Gene Regulatory Networks ; Hedgehog Proteins/metabolism ; Invertebrates/cytology/*embryology/*genetics/metabolism ; *Phylogeny ; Signal Transduction ; Stem Cells/cytology ; Vertebrates/anatomy & histology/genetics ; beta Catenin/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 3
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    Comment on “Effect of polydispersity on the ordering transition of adsorbed self-assembled rigid rods” (2012)
    American Physical Society (APS)
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    Publication Date: 2012-05-03
    Description: Author(s): L. G. López, D. H. Linares, and A. J. Ramirez-Pastor The critical behavior of self-assembled rigid rods on a square lattice was recently reinvestigated by Almarza et al. [ Phys. Rev. E 82 061117 (2010) ]. Based on the Binder cumulants and the value of the critical exponent of the correlation length, the authors found that the isotropic-nematic phase t... [Phys. Rev. E 85, 053101] Published Wed May 02, 2012
    Keywords: Statistical physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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