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  • Electronic structure and strongly correlated systems  (2)
  • Structure, structural phase transitions, mechanical properties, defects  (2)
  • microbial abundance  (2)
  • African Continental Ancestry Group/*genetics  (1)
  • 2015-2019  (7)
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  • 1
    Publikationsdatum: 2015-09-15
    Beschreibung: Author(s): M. W. Butchers, J. A. Duffy, J. W. Taylor, S. R. Giblin, S. B. Dugdale, C. Stock, P. H. Tobash, E. D. Bauer, and C. Paulsen The magnetism in the ferromagnetic superconductor UCoGe has been studied using a combination of magnetic Compton scattering, bulk magnetization, x-ray magnetic circular dichroism, and electronic structure calculations, in order to determine the spin and orbital moments. The experimentally observed t… [Phys. Rev. B 92, 121107(R)] Published Mon Sep 14, 2015
    Schlagwort(e): Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2015-10-10
    Beschreibung: Characterizing genetic diversity in Africa is a crucial step for most analyses reconstructing the evolutionary history of anatomically modern humans. However, historic migrations from Eurasia into Africa have affected many contemporary populations, confounding inferences. Here, we present a 12.5x coverage ancient genome of an Ethiopian male ("Mota") who lived approximately 4500 years ago. We use this genome to demonstrate that the Eurasian backflow into Africa came from a population closely related to Early Neolithic farmers, who had colonized Europe 4000 years earlier. The extent of this backflow was much greater than previously reported, reaching all the way to Central, West, and Southern Africa, affecting even populations such as Yoruba and Mbuti, previously thought to be relatively unadmixed, who harbor 6 to 7% Eurasian ancestry.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gallego Llorente, M -- Jones, E R -- Eriksson, A -- Siska, V -- Arthur, K W -- Arthur, J W -- Curtis, M C -- Stock, J T -- Coltorti, M -- Pieruccini, P -- Stretton, S -- Brock, F -- Higham, T -- Park, Y -- Hofreiter, M -- Bradley, D G -- Bhak, J -- Pinhasi, R -- Manica, A -- Biotechnology and Biological Sciences Research Council/United Kingdom -- New York, N.Y. -- Science. 2015 Nov 13;350(6262):820-2. doi: 10.1126/science.aad2879. Epub 2015 Oct 8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK. mg632@cam.ac.uk joneser@tcd.ie ron.pinhasi@ucd.ie am315@cam.ac.uk. ; Smurfit Institute of Genetics, Trinity College Dublin, Dublin, Ireland. mg632@cam.ac.uk joneser@tcd.ie ron.pinhasi@ucd.ie am315@cam.ac.uk. ; Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK. Integrative Systems Biology Laboratory, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia. ; Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK. ; Department of Society, Culture, and Language, University of South Florida St. Petersburg, 140 7th Avenue South, St. Petersburg, FL 33701, USA. ; Department of Anthropology, Ventura College, 4667 Telegraph Road, Ventura, CA 93003, USA. Humanities and Social Sciences Program, UCLA Extension, University of California Los Angeles, 10995 Le Conte Avenue, Los Angeles, CA 90095, USA. ; Department of Archaeology and Anthropology, University of Cambridge, Pembroke Street, Cambridge CB2 3QG, UK. ; Department of Physical Sciences, Earth and Environment, University of Siena, Via di Laterina, 8-53100 Siena, Italy. ; Department of Anthropology, University of Illinois at Urbana-Champaign, Public Service Archaeology and Architecture Program, 109 Davenport Hall, 607 South Mathews Avenue, Urbana, IL 61801, USA. ; Oxford Radiocarbon Accelerator Unit, Research Laboratory for Archaeology and the History of Art, University of Oxford, Dyson Perrins Building, South Parks Road, Oxford OX1 3QY, UK. Cranfield Forensic Institute, Cranfield University, Defence Academy of the United Kingdom, Shrivenham, Oxon SN6 8LA, UK. ; Oxford Radiocarbon Accelerator Unit, Research Laboratory for Archaeology and the History of Art, University of Oxford, Dyson Perrins Building, South Parks Road, Oxford OX1 3QY, UK. ; Theragen BiO Institute, 2nd Floor B-dong, AICT bldg, Iui-dong, Youngtong-gu, Suwon 443-270, Republic of Korea. ; Institute for Biochemistry and Biology, Faculty for Mathematics and Natural Sciences, University of Potsdam, Karl-Liebknechtstrasse 24-25, 14476 Potsdam Golm, Germany. Department of Biology, University of York, Wentworth Way, Heslington, York YO10 5DD, UK. ; Smurfit Institute of Genetics, Trinity College Dublin, Dublin, Ireland. ; The Genomics Institute, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea. ; School of Archaeology and Earth Institute, University College Dublin, Dublin 4, Ireland. mg632@cam.ac.uk joneser@tcd.ie ron.pinhasi@ucd.ie am315@cam.ac.uk.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26449472" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): African Continental Ancestry Group/*genetics ; Asia ; Biological Evolution ; Ethiopia ; Europe ; Genetic Variation ; *Genome, Human ; *Human Migration ; Humans ; Male
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2017-11-23
    Beschreibung: Author(s): K. L. Brown, S. F. Parker, I. Robles García, S. Mukhopadhyay, V. García Sakai, and C. Stock Lead-halide organic-inorganic perovskites consist of an inorganic host framework with an organic molecule occupying the interstitial space. The structure and dynamics of these materials have been heavily studied recently due to interest in their exceptional photovoltaic properties. We combine inelas... [Phys. Rev. B 96, 174111] Published Wed Nov 22, 2017
    Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2015-09-10
    Beschreibung: Author(s): F. Wallington, A. M. Arevalo-Lopez, J. W. Taylor, J. R. Stewart, V. Garcia-Sakai, J. P. Attfield, and C. Stock γ -triclinic and α -monoclinic polymorphs of CoV 2 O 6 are two of the few known transition-metal ion-based materials that display stepped 1 3 magnetization plateaus at low temperatures. Neutron diffraction [M. Markkula et al. , Phys. Rev. B 86 , 134401 (2012) ], x-ray dichroism [N. Hollmann et al. , Phys. R… [Phys. Rev. B 92, 125116] Published Wed Sep 09, 2015
    Schlagwort(e): Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2017-04-04
    Beschreibung: Author(s): Christopher D. O'Neill, Dmitry A. Sokolov, Andreas Hermann, Alexei Bossak, Christopher Stock, and Andrew D. Huxley We report that the lowest energy transverse-optic phonon in metallic SnTe softens to near zero energy at the structural transition at T C = 75 K and importantly show that the energy of this mode below T C increases as the temperature decreases. Since the mode is a polar displacement this proves unambiguo… [Phys. Rev. B 95, 144101] Published Mon Apr 03, 2017
    Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Publikationsdatum: 2023-06-29
    Beschreibung: Abstract
    Beschreibung: The effects of climate and topography on soil physico-chemical and microbial parameters were studied along an extensive latitudinal climate gradient in the Coastal Cordillera of Chile (26° - 38°S). The study sites encompass arid (Pan de Azúcar), semiarid (Santa Gracia), mediterranean (La Campana) and humid (Nahuelbuta) climates and vegetation, ranging from arid desert, dominated by biological soil crusts (biocrusts), semiarid shrubland and mediterranean sclerophyllous forest, where biocrusts are present but do have a seasonal pattern to temperate-mixed forest, where biocrusts only occur as an early pioneering development stage after disturbance. All soils originate from granitic parent materials and show very strong differences in pedogenesis intensity and soil depth.Most of the investigated physical, chemical and microbiological soil properties showed distinct trends along the climate gradient. Further, abrupt changes between the arid northernmost study site and the other semi-arid to humid sites can be shown, which indicate non-linearity and thresholds along the climate gradient. Clay and total organic carbon contents (TOC) as well as Ah horizons and solum depths increased from arid to humid climates, whereas bulk density (BD), pH values and base saturation (BS) decreased. These properties demonstrate the accumulation of organic matter, clay formation and element leaching as key-pedogenic processes with increasing humidity. However, the soils in the northern arid climate do not follow this overall latitudinal trend, because texture and BD are largely controlled by aeolian input of dust and sea salts spray followed by the formation of secondary evaporate minerals. Total soil DNA concentrations and TOC increased from arid to humid sites, while areal coverage by biocrusts exhibited an opposite trend. Relative bacterial and archaeal abundances were lower in the arid site, but for the other sites the local variability exceeds the variability along the climate gradient. Differences in soil properties between topographic positions were most pronounced at the study sites with the mediterranean and humid climate, whereas microbial abundances were independent on topography across all study sites. In general, the regional climate is the strongest controlling factor for pedogenesis and microbial parameters in soils developed from the same parent material. Topographic position along individual slopes of limited length augmented this effect only under humid conditions, where water erosion likely relocated particles and elements downward. The change from alkaline to neutral soil pH between the arid and the semi-arid site coincided with qualitative differences in soil formation as well as microbial habitats. This also reflects non-linear relationships of pedogenic and microbial processes in soils depending on climate with a sharp threshold between arid and semi-arid conditions. Therefore, the soils on the transition between arid and semi-arid conditions are especially sensitive and may be well used as indicators of long and medium-term climate changes. Concluding, the unique latitudinal precipitation gradient in the Coastal Cordillera of Chile is predestined to investigate the effects of the main soil forming factor – climate – on pedogenic processes.The data presented here is part of the German-Chilean Priority Program “EarthShape” (Earth Surface Shaping by Biota), funded by the German Research Foundation (DFG). We provide the basic background data, which includes investigations into the influence of climate, vegetation and topography on pedogenesis and microbial abundances. The data are supplementary material to Bernhard et al. (2018).All tables are available as one Excel file, as individual tables in .csv format in a zipped archive and as PDF file. The samples are assigned with International Geo Sample Numbers (IGSN) and linked to a comprehensive sample description in the internet.The content of the five data tables is:Table S1: Soil profile field description for the EarthShape study sitesTable S2: Soil physico-chemical properties for the depth increment samples in the four study sitesTable S3: Soil physico-chemical properties for the horizon samples in the four study sitesTable S4: Relative microbial abundances in the four study sitesTable S5: Plant species and abundance (% cover) in the four study sites
    Schlagwort(e): climate ; topography ; soil texture ; total organic carbon ; carbon isotope ratio (δ13 Corg) ; microbial abundance
    Sprache: Englisch
    Materialart: Dataset , Dataset
    Format: 707740 Bytes
    Format: 4 Files
    Format: application/pdf
    Format: application/x-zip-compressed
    Format: application/x-zip-compressed
    Format: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Publikationsdatum: 2024-03-07
    Beschreibung: Abstract
    Beschreibung: The Chilean Coastal Cordillera features a spectacular climate and vegetation gradient, ranging from arid and unvegetated areas in the north to humid and forested areas in the south. The DFG Priority Program "EarthShape" (Earth Surface Shaping by Biota) uses this natural gradient to investigate how climate and biological processes shape the Earth's surface. We explored the critical zone, the Earth's uppermost layer, in four key sites located in desert, semidesert, mediterranean, and temperate climate zones of the Coastal Cordillera, with the focus on weathering of granitic rock. Here, we present first results from four ~2m-deep regolith profiles to document: (1) architecture of weathering zone; (2) degree and rate of rock weathering, thus the release of mineral-derived nutrients to the terrestrial ecosystems; (3) denudation rates; and (4) microbial abundances of bacteria and archaea in the saprolite. From north to south, denudation rates from cosmogenic nuclides are ~10 t km-2 yr-1 at the arid Pan de Azúcar site, ~20 t km-2 yr-1 at the semi-arid site of Santa Gracia, ~60 t km-2 yr-1 at the mediterranean climate site of La Campana, and ~30 t km-2 yr-1 at the humid site of Nahuelbuta. A and B horizons increase in thickness and elemental depletion or enrichment increases from north (~26 °S) to south (~38 °S) in these horizons. Differences in the degree of chemical weathering, quantified by the chemical depletion fraction (CDF), are significant only between the arid and sparsely vegetated site and the other three sites. Differences in the CDF between the sites, and elemental depletion within the sites are sometimes smaller than the variations induced by the bedrock heterogeneity. Microbial abundances (bacteria and archaea) in saprolite substantially increase from the arid to the semi-arid sites. With this study, we provide a comprehensive dataset characterizing the Critical Zone geochemistry in the Chilean Coastal Cordillera. This dataset confirms climatic controls on weathering and denudation rates and provides prerequisites to quantify the role of biota in future studies. The data are supplementary material to Oeser et al. (2018). All samples are assigned with International Geo Sample Numbers (IGSN), a globally unique and persistent Identifier for physical samples. The IGSNs are provided in the data tables and link to a comprehensive sample description in the internet. The content of the eight data tables is: Table S1: Catena properties of the four primary EarthShape study areas. Table S2: Major and selected trace element concentration for bedrock samples. Table S3 Normative modal abundance of rock-forming minerals. Table S4: Major and selected trace element concentration for regolith samples and dithionite and oxalate soluble pedogenic oxides. Table S5: Weathering indices CDF and CIA, and the mass transfer coefficients (τ) for major and trace elements along with volumetric strain (ɛ). Table S6: Chemical weathering and physical erosion rates Table S7: Relative microbial abundances in saprolite of the four study areas. Table S8: Uncorrected major and trace element concentration. The data tables are provided as one Excel file with eight spreadsheets, as individual tables in .csv format in a zipped archive and as printable PDF versions in a zipped archive.
    Beschreibung: Other
    Beschreibung: The DFG Priority Program 1803 "EarthShape - Earth Surface Shaping by Biota" (2016-2022) bridges between scientific disciplines and includes geoscientists and biologists to study from different viewpoints the complex question how microorganisms, animals, and plants influence the shape and development of the Earth’s surface over time scales from the present-day to the distant geologic past. All study sites are located in the north-to-south trending Coastal Cordillera mountains of Chile, South America. These sites span from the Atacama Desert in the north to the Araucaria forests approximately 1300 km to the south. The site selection contains a large ecological and climate gradient ranging from very dry to humid climate conditions.
    Schlagwort(e): denudation ; microbial abundance ; Chile ; climate ; National Parc Pan de Azucar ; Private Reserve Santa Gracia ; National Parc La Campana ; National Parc Nahuelbuta ; Coastal Cordillera ; EARTH SCIENCE 〉 LAND SURFACE 〉 EROSION/SEDIMENTATION 〉 EROSION ; EARTH SCIENCE 〉 LAND SURFACE 〉 EROSION/SEDIMENTATION 〉 WEATHERING ; EARTH SCIENCE 〉 LAND SURFACE 〉 SOILS 〉 MICROFLORA ; EARTH SCIENCE 〉 LAND SURFACE 〉 SOILS 〉 SOIL CHEMISTRY
    Materialart: Dataset , Dataset
    Standort Signatur Erwartet Verfügbarkeit
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