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  • Oxford University Press  (43)
  • American Society of Hematology  (34)
  • Nature Publishing Group
  • 2020-2022  (72)
  • 1945-1949  (11)
  • 1925-1929
  • 1
    Electronic Resource
    Electronic Resource
    Constitution of ‘Pure’ Cellulose (1949)
    [s.l.] : Nature Publishing Group
    Nature 164 (1949), S. 786-787 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE word ‘cellulose’ possesses two connotations: in a technical sense it denotes products obtained by certain processes from vegetable material; in a chemical sense it is commonly used for a linear high-molecular polysaccharide composed solely of glucose residues linked by α 1-4 glucosidic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/164786b0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Fibrous Proteins (1949)
    [s.l.] : Nature Publishing Group
    Nature 164 (1949), S. 33-34 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Rubber-like Properties of Hair Keratin IT follows from the classical work of Joule 1 that the restoring force of stretched rubber is due to thermal motion. Meyer, y. Susich and Valk 2 showed for rubber at 100–300) per cent extension that the force at constant extension is proportional to the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/164033a0
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  • 3
    Electronic Resource
    Electronic Resource
    Relation Between Fountain Pressure and Heat Current in Helium II (1948)
    [s.l.] : Nature Publishing Group
    Nature 162 (1948), S. 67-68 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Allen and Reekie1 directed attention to the fact that the fountain-pressure difference ΔP at the ends of a narrow slit or capillary produced by a temperature difference is, in the absence of mass flow, exactly proportional to the heat current W appearing simultaneously with the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/162067b0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Climatic Changes: Their Causes and Influences (1927)
    [s.l.] : Nature Publishing Group
    Nature 120 (1927), S. 365-366 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN NATURE of Aug. 13 is published a review by Prof. J. W. Gregory of Dr. C. E. P. Brooks's recent book, “Climate through the Ages”. Referring to the remarkable evidence of a medieval deterioration of climate in Greenland, collected by the Danish expedition to Herjolfsnes, Prof. Gregory suggests ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/120365a0
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  • 5
    Electronic Resource
    Electronic Resource
    Classification of Fibrous Proteins (1949)
    [s.l.] : Nature Publishing Group
    Nature 164 (1949), S. 34-35 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fibrous proteins have been classified by Astbury1 into two groups, the keratin–myosin–fibrinogen group and the collagen group. The first group exhibits ‘long-range’ elasticity, which is attributed to attractive forces tending to establish a special folding of the protein chains in the contracted ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/164034b0
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  • 6
    Electronic Resource
    Electronic Resource
    Structure of Amylopectin (1947)
    [s.l.] : Nature Publishing Group
    Nature 160 (1947), S. 900-901 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SINCE starch can be split into maltose, the opinion has been widespread that starch is composed of chains of the maltose type1. Some authors, however, suggested a branched or netted structure2,3; comparative measurements of molecular weight and viscosity were ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/160900a0
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  • 7
    Electronic Resource
    Electronic Resource
    Cultivation of the Erythrocytic Form of Plasmodium gallinaceum in Tissue Cultures of Embryonic Chicken Brain (1947)
    [s.l.] : Nature Publishing Group
    Nature 160 (1947), S. 155-156 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN previous experiments a method was found for the cultivation of the exoerythrocytic form of Plasmodium gallinaceum in tissue cultures of embryonic chicken brain. It was found that proliferation of the parasites in tissue culture cells is very slow, and that the initial stages are difficult to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/160155b0
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  • 8
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    Full wave sensitivity of SK(K)S phases to arbitrary anisotropy in the upper and lower mantle (2020)
    Oxford University Press
    Details
    Publication Date: 2020-04-11
    Description: Core-refracted phases such as SKS and SKKS are commonly used to probe seismic anisotropy in the upper and lowermost portions of the Earth’s mantle. Measurements of SK(K)S splitting are often interpreted in the context of ray theory, and their frequency dependent sensitivity to anisotropy remains imperfectly understood, particularly for anisotropy in the lowermost mantle. The goal of this work is to obtain constraints on the frequency dependent sensitivity of SK(K)S phases to mantle anisotropy, particularly at the base of the mantle, through global wavefield simulations. We present results from a new numerical approach to modelling the effects of seismic anisotropy of arbitrary geometry on seismic wave propagation in global 3-D earth models using the spectral element solver AxiSEM3D. While previous versions of AxiSEM3D were capable of handling radially anisotropic input models, here we take advantage of the ability of the solver to handle the full fourth-order elasticity tensor, with 21 independent coefficients. We take advantage of the computational efficiency of the method to compute wavefields at the relatively short periods (5 s) that are needed to simulate SK(K)S phases. We benchmark the code for simple, single-layer anisotropic models by measuring the splitting (via both the splitting intensity and the traditional splitting parameters ϕ and δt) of synthetic waveforms and comparing them to well-understood analytical solutions. We then carry out a series of numerical experiments for laterally homogeneous upper mantle anisotropic models with different symmetry classes, and compare the splitting of synthetic waveforms to predictions from ray theory. We next investigate the full wave sensitivity of SK(K)S phases to lowermost mantle anisotropy, using elasticity models based on crystallographic preferred orientation of bridgmanite and post-perovskite. We find that SK(K)S phases have significant sensitivity to anisotropy at the base of the mantle, and while ray theoretical approximations capture the first-order aspects of the splitting behaviour, full wavefield simulations will allow for more accurate modelling of SK(K)S splitting data, particularly in the presence of lateral heterogeneity. Lastly, we present a cross-verification test of AxiSEM3D against the SPECFEM3D_GLOBE spectral element solver for global seismic waves in an anisotropic earth model that includes both radial and azimuthal anisotropy. A nearly perfect agreement is achieved, with a significantly lower computational cost for AxiSEM3D. Our results highlight the capability of AxiSEM3D to handle arbitrary anisotropy geometries and its potential for future studies aimed at unraveling the details of anisotropy at the base of the mantle.
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Royal Astronomical Society.
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  • 9
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    Ingredients to become a scientist: curiosity, enthusiasm, perseverance, opportunity, and a good pinch of luck (2020)
    Oxford University Press
    Details
    Publication Date: 2020-07-02
    Description: Writing a 200-word abstract about the life of a 76-year-old scientist, in which luck played a significant role, is not an easy task. Even knowing this scientist well (for I am talking about myself) does not make it any easier. When you notice something is not right, do not fear changing your major (I changed twice before settling on Fisheries and Marine Science). For my PhD in neurobiology, I changed again. Grab opportunities when they arise. Join field trips and expeditions, attend conferences, and spread your interests widely. Spend time in different countries, learn new techniques and languages, and always stay curious. Remain humble. I carried out speleological research in Jamaica and France, participated in a 4-month South Atlantic Fisheries Research Trip and a 3-month Bioluminescence Expedition to the Moluccas, and pioneered comparative physiological and functional anatomical research in Antarctica and the Arctic. Be adventurous. My ethnobiological field work took me to Papua Niugini, NE-India, and Central Australia. Having lived in Australia, Finland, France, Germany, Jamaica, Japan, and New Zealand (I am a New Zealander currently living in Korea) and having spent sabbaticals in Brazil, India, New Caledonia, and North Korea, I consider myself a global scientist. You can become one too.
    Print ISSN: 1054-3139
    Electronic ISSN: 1095-9289
    Topics: Biology , Geosciences , Physics
    Published by Oxford University Press on behalf of International Council for the Exploration of the Sea.
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  • 10
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    Oceanic high-frequency global seismic wave propagation with realistic bathymetry (2020)
    Oxford University Press
    Details
    Publication Date: 2020-05-22
    Description: SUMMARY We present a new approach to simulate high-frequency seismic wave propagation in and under the oceans. Based upon AxiSEM3D, this method supports a fluid ocean layer, with associated water-depth phases and seafloor topography (bathymetry). The computational efficiency and flexibility of this formulation means that high-frequency calculations may be carried out with relatively light computational loads. A validation of the fluid ocean implementation is shown, as is an evaluation of the oft-used ocean loading formulation, which we find breaks down at longer periods than was previously believed. An initial consideration of the effects of seafloor bathymetry on seismic wave propagation is also given, wherein we find that the surface waveforms are significantly modified in both amplitude and duration. When compared to observed data from isolated island stations in the Pacific, synthetics which include a global ocean and seafloor topography appear to more closely match the observed waveform features than synthetics generated from a model with topography on the solid surface alone. We envisage that such a method will be of use in understanding the new and exciting ocean-bottom and floating seismometer data sets now being regularly collected.
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Royal Astronomical Society.
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