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  • Oxford University Press  (42)
  • American Association for the Advancement of Science (AAAS)
  • American Institute of Physics (AIP)
  • American Physical Society (APS)
  • Nature Publishing Group
  • 2020-2022  (43)
  • 1950-1954  (7)
Collection
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Biological Significance of Folding and Unfolding of Protein Molecules (1951)
    [s.l.] : Nature Publishing Group
    Nature 167 (1951), S. 736-736 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Protein chains in an alkaline medium (left) and at the isoelectric point (right). From Meyer, K. H., Biochem. Z., 214, 253 (1929) Summarizing this hypothesis in our monograph3, we wrote : "Beim Muskel war es verhaltnismassig deutlich zu erkennen, dass die Formanderung von Eiweissketten eine ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/167736a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Production of Unsaturated Uronides by Bacterial Hyaluronidases (1954)
    [s.l.] : Nature Publishing Group
    Nature 174 (1954), S. 1192-1193 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The pneumococcal product differs markedly, however, from N-acetylhyalobiuronic acid, the repeating unit of hyaluronate3 and of the oligosaccharide fractions obtained on digestion with testicular hyaluronidase2 as demonstrated in Table 1. The values indicate that the bacterial product is a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1741192a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Chemotherapeutic Experiments with Natural Constituents of the Body (1954)
    [s.l.] : Nature Publishing Group
    Nature 174 (1954), S. 555-556 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The fact that ascorbic acid itself has a bactericidal action was shown by von Gagyi3 and myself4. Cysteine has been used in the treatment of hepatitis and also in the treatment of mustard gas burns of the skin ; for which latter purpose I devised5 an electrophoretic method. As is well known, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/174555a0
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  • 4
    Electronic Resource
    Electronic Resource
    Plastic Deformation and the Meyer Constants of Metals (1952)
    [s.l.] : Nature Publishing Group
    Nature 169 (1952), S. 237-238 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It can be shown that if the true stress-strain curve of annealed metals can be represented by : * = g*x, (2) where x (for annealed cubic metals4 about 0-5) and g are constants of the metal, a the true stress and e the plastic elongation, then Hu must increase and n must decrease with ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/169237a0
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  • 5
    Electronic Resource
    Electronic Resource
    Temperature Characteristics of the Microflora of Central African Soils (1951)
    [s.l.] : Nature Publishing Group
    Nature 168 (1951), S. 791-791 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The experimental results presented here report our preliminary findings regarding the order of magnitude of the activation energy calculated from the rate of oxygen uptake at different temperatures. The measurements of oxygen uptake were always made on soils immediately after they had been brought ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/168791a0
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  • 6
    Electronic Resource
    Electronic Resource
    Isolation of a Crystalline Disaccharide, Hyalobiuronic Acid, from Hyaluronic Acid (1951)
    [s.l.] : Nature Publishing Group
    Nature 168 (1951), S. 996-997 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The present communication is concerned with the isolation and characterization of a crystalline aldo-biuronic acid from sodium hyaluronate in relatively high yield, following degradation by a combination of enzymic and mild acid hydrolysis. Sodium hyaluronate (analysis3: nitrogen, 3-78; uronic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/168996b0
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of Cations on the Ninhydrin Reaction for the Determination of Amino-Acids (1953)
    [s.l.] : Nature Publishing Group
    Nature 172 (1953), S. 543-543 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The addition of 0-1 ml. of a M/100 solution of any of the cations, A13+, Hg2+, Fe2+, Fe3+, Mn2+, Sn2+, Ag+ and Cu2+, to a reaction mixture consisting of 10 [Lgm. alanine in 0-1 ml. water and 3 ml. of a 0-1 per cent solution of ninhydrin in n-butanol entirely abolished colour formation, which ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/172543a0
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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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