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  • 1
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2013-05-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cheetham, Seth W -- Brand, Andrea H -- 092096/Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2013 May 17;340(6134):817-8. doi: 10.1126/science.1238525.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Gurdon Institute and Department of Physiology, Development, and Neuroscience, University of Cambridge, Tennis Court Road, Cambridge CB2 1QN,UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23687033" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Drosophila Proteins/metabolism ; Drosophila melanogaster/*metabolism ; Insulin/*metabolism ; Phosphatidylinositol 3-Kinases/metabolism ; *Signal Transduction ; Somatomedins/metabolism ; Stem Cells/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2014-09-23
    Description: Experimental investigations of transactinoide elements provide benchmark results for chemical theory and probe the predictive power of trends in the periodic table. So far, in gas-phase chemical reactions, simple inorganic compounds with the transactinoide in its highest oxidation state have been synthesized. Single-atom production rates, short half-lives, and harsh experimental conditions limited the number of experimentally accessible compounds. We applied a gas-phase carbonylation technique previously tested on short-lived molybdenum (Mo) and tungsten (W) isotopes to the preparation of a carbonyl complex of seaborgium, the 106th element. The volatile seaborgium complex showed the same volatility and reactivity with a silicon dioxide surface as those of the hexacarbonyl complexes of the lighter homologs Mo and W. Comparison of the product's adsorption enthalpy with theoretical predictions and data for the lighter congeners supported a Sg(CO)6 formulation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Even, J -- Yakushev, A -- Dullmann, Ch E -- Haba, H -- Asai, M -- Sato, T K -- Brand, H -- Di Nitto, A -- Eichler, R -- Fan, F L -- Hartmann, W -- Huang, M -- Jager, E -- Kaji, D -- Kanaya, J -- Kaneya, Y -- Khuyagbaatar, J -- Kindler, B -- Kratz, J V -- Krier, J -- Kudou, Y -- Kurz, N -- Lommel, B -- Miyashita, S -- Morimoto, K -- Morita, K -- Murakami, M -- Nagame, Y -- Nitsche, H -- Ooe, K -- Qin, Z -- Schadel, M -- Steiner, J -- Sumita, T -- Takeyama, M -- Tanaka, K -- Toyoshima, A -- Tsukada, K -- Turler, A -- Usoltsev, I -- Wakabayashi, Y -- Wang, Y -- Wiehl, N -- Yamaki, S -- New York, N.Y. -- Science. 2014 Sep 19;345(6203):1491-3. doi: 10.1126/science.1255720.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Helmholtz-Institut Mainz, 55099 Mainz, Germany. ; GSI Helmholtzzentrum fur Schwerionenforschung GmbH, 64291 Darmstadt, Germany. ; Helmholtz-Institut Mainz, 55099 Mainz, Germany. GSI Helmholtzzentrum fur Schwerionenforschung GmbH, 64291 Darmstadt, Germany. Institut fur Kernchemie, Johannes Gutenberg-Universitat Mainz, 55099 Mainz, Germany. duellman@uni-mainz.de. ; RIKEN, Wako, Saitama 351-0198, Japan. ; Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan. ; Institut fur Kernchemie, Johannes Gutenberg-Universitat Mainz, 55099 Mainz, Germany. ; Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland. Paul Scherrer Institute, 5232 Villigen, Switzerland. ; Institute of Modern Physics, Chinese Academy of Sciences, 730000 Lanzhou, China. ; Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan. Department of Chemistry, Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan. ; RIKEN, Wako, Saitama 351-0198, Japan. Department of Physics, Kyushu University, Higashi-Ku, Fukuoka, 812-8581, Japan. ; RIKEN, Wako, Saitama 351-0198, Japan. Department of Chemistry, Niigata University, Niigata, Niigata 950-2181, Japan. ; Department of Chemistry, University of California, Berkeley, CA 94720-1460, USA. Lawrence Berkeley National Laboratory, Berkeley, CA 94720-8169, USA. ; Department of Chemistry, Niigata University, Niigata, Niigata 950-2181, Japan. ; Helmholtz-Institut Mainz, 55099 Mainz, Germany. Institut fur Kernchemie, Johannes Gutenberg-Universitat Mainz, 55099 Mainz, Germany. ; RIKEN, Wako, Saitama 351-0198, Japan. Department of Physics, Saitama University, Saitama 338-8570, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25237098" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 96 (1992), S. 7725-7732 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 12773-12782 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 1293-1301 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 59 (1990), S. 53-72 
    ISSN: 1572-9613
    Keywords: Diffusion ; trapping problem ; survival probability ; imperfect traps
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper deals with independent particles diffusing on a line with traps at random positions. It is shown how the long-time decay of the survival probability is exhanced when particles do not necessarily disappear upon hitting a trap. The results are compared with predictions for a model where particles are either absorbed or reflected by traps.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 765-770 
    ISSN: 0392-6737
    Keywords: Experimental determinations of smectic, nematic, cholesteric, and lyotropic structures ; Specialized material fabrications and fabrication techniques ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Pattern formation at phase boundaries moving in a temperature gradient is one of the major areas of nonequilibrium physics attracting considerable attention. While most of the early work concentrated on the moving solid-liquid interface, now the focus has changed to phase transitions characterized by broken continuous symmetry. Most recently we investigated consequences to interfacial patterns of a chirality-induced equilibrium length. Here we study patterns at another chiral interface where one of the phases has a chirality-induced defect lattice, the twist grain boundary (TGB) phase. The TGB state is analogous to the vortex lattice in Type-II superconductors predicted by the Gennes’ analogy between the nematic (N)-smectic A (A) transition and the normal-superconducting transition. In this analogy, a cholesteric A transition is analogous to the normal-superconducting transition in an external magnetic field and a theory has been developed for its analogous vortex lattice, the TGB phase, when this transition is Type II. We study patterns formed at the traveling TGB-A phase boundary. Different patterns are observed depending on whether TGB grows into A or A into TGB. Indeed, this maybe the first time a steady-state pattern is observed in directional melting (i.e. TGB growing into A). As these patterns have a broad band of wavelengths, they are difficult to characterize physically. Thus, we introduced a novel analysis (most simply but not rigorously described as) measuring the fractal dimension of the patterns at these traveling interfaces. Two lengths emerged from this analysis: a longer one set by sample thickness and a shorter one set by the smallest TGB unit that can grow into an oriented smectic A phase. We invoke our old dynamic arguments to account for why TGB cannot propagate at a second-order TGB-cholesteric phase transition so it is eventually squeezed out leaving behind a direct cholesteric-A transition.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 74 (1991), S. 177-188 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents This paper is trying to review the state of the art in the field of electromagnetic microwaves at the beginning of the nineties. The definition includes that part of the spectrum where the wavelength λ is comparable with the linear sizes of the components, it extends from λ=3 m (f=100MHz) to λ=300 μm (f=1000 GHz). Examples for components or subsystems are microwave tubes and microwave semiconductor devices to be compared in the generation of high power. The development in waveguiding structures, in antennas and in receiver frontends are further taken into consideration. Successful operations in satellite communications and in deep space missions result basically from a better understanding of wave propagation around the planet earth. Regarding applications special attention is given to radar and further to radiometry which could become increasingly important for enviromental protection, and at last to wireless energy transmission eventually necessary in the future.
    Notes: Übersicht In diesem Beitrag wird versucht, den Stand der Technik auf dem Gebiet der elektromagnetischen Mikrowellen zu Beginn der 90er Jahre zu umreißen. Darunter wird der Teil des Spektrums verstanden, bei dem die Wellenlänge λ mit den Linearabmessungen der Bauteile vergleichbar ist: er erstieckt sich von etwa λ=3 m (f=100 MHz) bis λ =300 μm (f=1000 GHz). Als Beispiele für Komponenten oder Subsysteme werden Mikrowellenröhren mit Mikrowellen-halbleitern zur Erzeugung hoher Leistungen verglichen und die Entwicklung auf dem Gebiete der Wellenleiter, Antennen und der Empfangssysteme betrachtet. Erkenntnisse über die Wellenausbreitung um den Planeten Erde waren wesentliche Voraussetzungen für die Erfolge der Satelliten-Funktechnik und bei Weltraumforschungsmissionen. Bei den Anwendungen wird die Radartechnik sowie die Radiometrie mit ihrer wachsenden Bedeutung für den Umweltschutz und schließlich eine eventuelle zukünftige drahtlose Energieübertragung besonders hervorgehoben.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 77 (1993), S. 1-1 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 77 (1993), S. 3-6 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents The reasons are given why electromagnetic waves in the frequency region from about 0.1 THz up to about 10 THz can do some jobs caused by the physical situation of the terrestrial atmosphere and why some others near ground not. In order to introduce into the following papers the known solutions for system realizations are reviewed without details. The discussions of the Sindelfingen ITG-workshop on May 28, 1993 about challenges in the future and strategies for solutions are summarized.
    Notes: Übersicht Es wird begründet, weshalb elektromagnetische Wellen im Frequenzbereich von etwa 0,1 THz bis rund 10 THz aufgrund der physikalischen Situation der terrestrischen Atmosphäre bestimmte Aufgaben erfüllen können und weshalb andere in Bodennähe nicht. Zur Einführung in die nachfolgenden Beiträge werden die heute bekannten Systemlösungen summarisch skizziert. Die Diskussionen auf der Sindelfinger ITG-Sitzung am 28. 5. 1993 über Herausforderungen und Lösungsstrategien der Zukunft werden zusammenfassend wiedergegeben.
    Type of Medium: Electronic Resource
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