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  • 1
    Electronic Resource
    Electronic Resource
    An oxalato-bridged copper(II) complex (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. m263-m264 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In the coordination complex μ-oxalato-bis[(isocyanato-N)(tetramethylethylenediamine)copper(II)], [Cu2(NCO)2(C2O4)(C6H16N2)2], the CuII ions are five-coordinated. One CuII ion bridges to another centrosymmetry-related CuII ion through C2O42−, forming a plane with an r.m.s. deviation of 0.059 Å. The O—Cu—O angle is 79.33 (8)° and the Cu...Cu separation is 5.14 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801007814
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  • 2
    Electronic Resource
    Electronic Resource
    How does the mouse get its trunk? (2001)
    [s.l.] : Nature Publishing Group
    Nature genetics 27 (2001), S. 351-352 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] At first glance, the mouse embryo must seem impossibly small to work with. Despite this, we know as much about the mechanisms patterning the mouse embryo as about those shaping much larger or more transparent vertebrate embryos. Much of this success can be attributed to two powerful ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/86829
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal investigations of the calcium salts of monocarboxylic aliphatic fatty acids (1979)
    Springer
    Journal of thermal analysis and calorimetry 16 (1979), S. 13-26 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé La déhydratation et la décarboxylation des sels de calcium des acides acétique, mono, di et trichloroacétique ont été étudiées à l'aide d'un Derivatograph. Seul l'acétate de calcium présente une transition de phase. Les effets respectifs du creuset et du diluant sur le comportement thermique de ces sels ont également été suivis. Les produits de décomposition ont été analysés qualitativement. D'après la nature des gaz émis et celle des résidus de pyrolyse, un mécanisme est proposé pour ces décompositions. Les énergies d'activation des réactions de décarboxylation sont calculées à partir des courbes TG.
    Abstract: Zusammenfassung Die Calciumsalze von EssigsÄure sowie von Mono-, Di- und TrichloressigsÄure wurden mittels eines Derivatographen hinsichtlich ihrer Dehydratisierung und Decarboxylierung untersucht. Ein Phasenübergang wurde nur im Falle des Calciumacetats beobachtet. Der Effekt des Tiegels und des Verdünners auf das thermische Verhalten obiger Salze wurde ebenfalls untersucht. Die Zersetzungsprodukte wurden qualitativ geprüft und aus diesen gasförmigen Produkten sowie aus ihren Pyrolyseresten wurde ein wahrscheinlicher Zersetzungsmechanismus vorgeschlagen. Die Aktivierungsenergien der DecarboxylierungsvorgÄnge wurden aus den TG-Kurven ermittelt.
    Notes: Abstract Calcium salts of acetic and mono, di and trichloroacetic acids were investigated with respect to their dehydration and decarboxylation, using a derivatograph. A phase transition was noticed only in the case of calcium acetate. Effects of crucible and diluent on the thermal behaviour of the above salts were also studied. The decomposition products were investigated qualitatively, and from these gaseous products and also from the residue after pyrolysis the probable mechanisms of decompositions have been suggested. Activation energies for the decarboxylation processes were evaluated from the TG curves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01909628
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal Studies of N-phenylethane-1,2-diamine Complexes of Nickel(II) in the Solid State (1999)
    Springer
    Journal of thermal analysis and calorimetry 55 (1999), S. 895-902 
    Details
    ISSN: 1572-8943
    Keywords: nickel(II) diamine complexes ; N-phenylethane-1,2-diamine ; phase transition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract [NiL3]X2 (where L=N-phenylethane-1,2-diamine and X=I− and ClO4 −), [NiL2X2] (X is Cl−, Br−, NCS−, 0.5SO4 2− or 0.5SeO4 2−) and [NiL2(H2O)2](NO3)2 have been synthesized from solution and their thermal study has been carried out in the solid phase. [NiL2Cl2] upon heating undergoes irreversible endothermic phase transition (142–152°C, ΔH=0.35 kJ mol−1) without showing any visual colour change. This phase transition is assumed to be due to conformation changes of the diamine chelate rings. NiLCl2 and NiL2.5I2 have been prepared pyrolytically from [NiL2Cl2] and [NiL3]I2 respectively in the solid state. [NiL2(H2O)2](NO3)2 upon heating undergoes deaquation-anation reaction without showing any visual colour change. [NiL2X2] (X is Cl−, Br−, NCS−), [NiL2(H2O)2](NO3)2 and [NiL2(NO3)2] possess trans-octahedral configuration, whereas, [NiL2X2] (X is 0.5SO4 2− or 0.5SeO4 2−) are having cis-octahedral configuration. Amongst the complexes, only NiLCl2 shows unusually high (5.1 BM at 27°C) magnetic susceptibility value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010194119452
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal Studies of Nickel(II) Squarate Complexes of Triamines in the Solid State (1999)
    Springer
    Journal of thermal analysis and calorimetry 55 (1999), S. 165-172 
    Details
    ISSN: 1572-8943
    Keywords: DSC ; nickel(II) squarate ; phase transition ; TG-DTA ; triamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract [NiL2]C4O4·nH2O [where n=2 when L=diethylenetriamine(dien) and N-(3-aminopropyl)-1,3-propanediamine (dpt); n=3 when L=N-(2-aminoethyl)-1,3-propanediamine (aepn); n=0 when L=N2-methyldiethylenetriamine (medien)] and Ni(tmdien)C4O4·2H2O (where tmdien=1,4,7 trimethyl-diethylenetriamine) have been synthesised and investigated thermally in the solid state. Ni(dpt)C4O4·H2O has also been synthesised pyrolytically in the solid state from the corresponding bis complex. All the complexes possess octahedral geometry. The squarate anion takes part in coordination only in monotriamine species. [Ni(medien)2]C4O4 upon heating undergoes phase transition (270–285°C; ΔH=4.9 kJ mol−1) accompanied by colour change pink to grey. Thermal stability decreases with increase in chain length of the triamines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010100609516
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  • 6
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    Transposable Element Targeting by piRNAs in Laurasiatherians with Distinct Transposable Element Histories (2016)
    Oxford University Press
    Details
    Publication Date: 2016-05-11
    Description: PIWI proteins and PIWI-interacting RNAs (piRNAs) are part of a cellular pathway that has evolved to protect genomes against the proliferation of transposable elements (TEs). PIWIs and piRNAs assemble into complexes that are involved in epigenetic and post-transcriptional repression of TEs. Most of our understanding of the mechanisms of piRNA-mediated TE silencing comes from fruit fly and mouse models. However, even in these well-studied animals it is unclear how piRNA responses relate to variable TE expression and whether the strength of the piRNA response affects TE content over time. Here, we assessed the evolutionary interactions between TE and piRNAs in a statistical framework using three nonmodel laurasiatherian mammals as a study system: dog, horse, and a vesper bat. These three species diverged ~80 million years ago and have distinct genomic TE contents. By comparing species with distinct TE landscapes, we aimed to identify clear relationships among TE content, expression, and piRNAs. We found that the TE subfamilies that are the most transcribed appear to elicit the strongest "ping-pong" response. This was most evident among long interspersed elements, but the relationships between expression and ping-pong pilRNA (piRNA-like) expression were more complex among SINEs. SINE transcripts were equally abundant in the dog and horse yet new SINE insertions were relatively rare in the horse genome, where we identified a stronger piRNA response. Our analyses suggest that the piRNA response can have a strong impact on the TE composition of a genome. However, our results also suggest that the presence of a robust piRNA response is apparently not sufficient to stop TE mobilization and accumulation.
    Electronic ISSN: 1759-6653
    Topics: Biology
    Published by Oxford University Press
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  • 7
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    Low-energy theory for the graphene twist bilayer (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-01-29
    Description: Author(s): D. Weckbecker, S. Shallcross, M. Fleischmann, N. Ray, S. Sharma, and O. Pankratov The graphene twist bilayer represents the prototypical system for investigating the stacking degree of freedom in few-layer graphenes. The electronic structure of this system changes qualitatively as a function of angle, from a large-angle limit in which the two layers are essentially decoupled—with… [Phys. Rev. B 93, 035452] Published Wed Jan 27, 2016
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    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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    Human ribosomal RNA genes: orientation of the tandem array and conservation of the 5' end (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-01-01
    Description: The multiple copies of the human ribosomal RNA genes (rDNA) are arranged as tandem repeat clusters that map to the middle of the short arms of chromosomes 13, 14, 15, 21, and 22. Concerted evolution of the gene family is thought to be mediated by interchromosomal recombination between rDNA repeat units, but such events would also result in conservation of the sequences distal to the rDNA on these five pairs of chromosomes. To test this possibility, a DNA fragment spanning the junction between rDNA and distal flanking sequence has been cloned and characterized. Restriction maps, sequence data, and gene mapping studies demonstrate that (i) the rRNA genes are transcribed in a telomere-to-centromere direction, (ii) the 5' end of the cluster and the adjacent non-rDNA sequences are conserved on the five pairs of chromosomes, and (iii) the 5' end of the cluster is positioned about 3.7 kb upstream from the transcription initiation site of the first repeat unit. The data support a model of concerted evolution by interchromosomal recombination.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Worton, R G -- Sutherland, J -- Sylvester, J E -- Willard, H F -- Bodrug, S -- Dube, I -- Duff, C -- Kean, V -- Ray, P N -- Schmickel, R D -- HD-13506/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1988 Jan 1;239(4835):64-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Genetics Department, Hospital for Sick Children, Toronto, Ontario, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3336775" target="_blank"〉PubMed〈/a〉
    Keywords: Biological Evolution ; Chromosomes, Human, Pair 13 ; Chromosomes, Human, Pair 14 ; Chromosomes, Human, Pair 15 ; Chromosomes, Human, Pair 21 ; Chromosomes, Human, Pair 22 ; Cloning, Molecular ; DNA, Ribosomal/*genetics ; Genes ; Humans ; RNA, Ribosomal/*genetics ; Sequence Homology, Nucleic Acid ; Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    Comment on "Ongoing adaptive evolution of ASPM, a brain size determinant in Homo sapiens" and "Microcephalin, a gene regulating brain size, continues to evolve adaptively in humans" (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-07-15
    Description: Mekel-Bobrov et al. and Evans et al. (Reports, 9 Sept. 2005, p. 1720 and p. 1717, respectively) examined sequence data from modern humans within two gene regions associated with brain development, ASPM and microcephalin, and concluded that selection of these genes must be ongoing. We show that models of human history that include both population growth and spatial structure can generate the observed patterns without selection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Currat, Mathias -- Excoffier, Laurent -- Maddison, Wayne -- Otto, Sarah P -- Ray, Nicolas -- Whitlock, Michael C -- Yeaman, Sam -- New York, N.Y. -- Science. 2006 Jul 14;313(5784):172; author reply 172.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16840683" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Biological ; Biological Evolution ; Brain ; Demography ; Founder Effect ; Gene Frequency ; *Haplotypes ; Humans ; Models, Theoretical ; Nerve Tissue Proteins/*genetics ; Organ Size ; Population Density ; *Population Growth ; Selection, Genetic ; *Sequence Analysis, DNA
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    Low-frequency radio observations of SN 2011dh and the evolution of its post-shock plasma properties (2016)
    Oxford University Press
    Details
    Publication Date: 2016-04-17
    Description: We present late time, low-frequency observations of SN 2011dh made using the Giant Metrewave Radio Telescope (GMRT). Our observations at 325, 610 and 1280 MHz conducted between 93 and 421 d after the explosion supplement the millimeter and centimetre wave observations conducted between 4 and 15 d after explosion using the Combined Array for Research in Millimeter-wave Astronomy (CARMA) and extensive radio observations (1.0–36.5 GHz) conducted between 16 and 93 d after explosion using Jansky Very Large Array (JVLA). We fit a synchrotron self absorption model (SSA) to the 610 and 1280 MHz radio light curves. We use it to determine the radius ( R p ) and magnetic field ( B p ) at 173 and 323 d after the explosion. A comparison of the peak radio luminosity L op with the product of the peak frequency p and time to peak t p shows that the supernova evolves between the epochs of CARMA, JVLA and GMRT observations. It shows a general slowing down of the expansion speed of the radio emitting region on a time-scale of several hundred days during which the shock is propagating through a circumstellar medium set up by a wind with a constant mass-loss parameter, $\dot{M}/{v}_{\rm w}$ . We derive the mass-loss parameter ( A * ) based on 610 and 1280 MHz radio light curves, which are found to be consistent with each other within error limits.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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