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  • 2005-2009  (1)
  • 1940-1944  (4)
  • 1930-1934  (10)
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  • 1
    Digitale Medien
    Digitale Medien
    Pleochroism and Crystal Structure. (1930)
    [s.l.] : Nature Publishing Group
    Nature 126 (1930), S. 12-12 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IN a very important paper (Phil. Mag., vol. 33, p. 521 ; 1917), Silberstein developed a theory of molecular refractivity based on the idea that the electric doublets induced by the field of the light wave in the atoms composing the molecule influence each other, the result of such atomic ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/126012a0
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  • 2
    Digitale Medien
    Digitale Medien
    Dimorphism of Diphenyl Octatetraene Crystals (1940)
    [s.l.] : Nature Publishing Group
    Nature 146 (1940), S. 333-333 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] THE crystal structures of the diphenyl polyenes, having the general formula ... have been studied by Hengstenberg and Kuhn1 by X-ray methods. They find that while the lower members of the series, with n = 1 to 4, crystallize in the monoclinic system, the higher members studied ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/146333a0
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  • 3
    Digitale Medien
    Digitale Medien
    Landau Diamagnetism and the Fermi-Dirac Energy Distribution of the Metallic Electrons in Graphite (1940)
    [s.l.] : Nature Publishing Group
    Nature 145 (1940), S. 31-32 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IT was discovered by Landau1 that an electron gas should have, besides its spin paramagnetism, an appreciable diamagnetism due to the quantized orbital motions of the electrons in the magnetic field. If the electrons are free, the diamagnetic susceptibility per unit volume of the ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/145031a0
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  • 4
    Digitale Medien
    Digitale Medien
    The current practice of tracheostomy in the United Kingdom: a postal survey (2005)
    Oxford, UK : Blackwell Science Ltd
    Anaesthesia 60 (2005), S. 0 
    Details
    ISSN: 1365-2044
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: A postal questionnaire was sent to 228 intensive care units throughout the United Kingdom to determine aspects of current tracheostomy practice. From the number of units responding (n = 178, 78%), the majority (n = 173, 97%) practised percutaneous tracheostomy as opposed to open surgical tracheostomy. The Blue Rhino single dilator was the most popular technique (n = 114, 64%). Percutaneous tracheostomy is increasingly carried out under bronchoscopic guidance (n = 148, 83%); however, there remains considerable variation in the timing of tracheostomy and only 61 units (34%) have set follow-up procedures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2044.2004.04106.x
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  • 5
    Digitale Medien
    Digitale Medien
    Crystal Structure of 1, 3, 5-Triphenylbenzene (1934)
    [s.l.] : Nature Publishing Group
    Nature 133 (1934), S. 497-497 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IN a recent communication on the crystal structure of 1, 3, 5-triphenylbenzene, Dr. Kathleen Lonsdale1 discusses the results of recent X-ray measurements on the crystal and concludes that the planes of the benzene rings of the molecules cannot coincide with the (001) plane of the ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/133497a0
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  • 6
    Digitale Medien
    Digitale Medien
    Molecular Orientations in p -Diphenylbenzene Crystal (1933)
    [s.l.] : Nature Publishing Group
    Nature 132 (1933), S. 968-969 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IN recent papers1 we have shown how a correlation of the principal diamagnetic susceptibilities of an organic crystal with those for the molecules of the substance, offers a convenient method for determining the orientations of the molecules in the crystal lattice. The crystal of ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/132968c0
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  • 7
    Digitale Medien
    Digitale Medien
    Pleochroism and Birefringence in Crystals (1933)
    [s.l.] : Nature Publishing Group
    Nature 132 (1933), S. 411-411 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] PROF. W. L. BRAGG1 explains the strong birefringence of some carbonates and nitrates as being due to the interaction of the optical dipoles induced in the component atoms. For example, X-ray analysis shows that the carbonate ions in calcite have a plane structure, their planes ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/132411a0
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  • 8
    Digitale Medien
    Digitale Medien
    Orientations of Molecules in the p -Benzoquinone Crystal (1933)
    [s.l.] : Nature Publishing Group
    Nature 131 (1933), S. 653-654 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] THE crystal structure of p-benzoquinone has recently been studied by W. A. Caspari1 by X-ray methods. The crystal belongs to the monoclinic system and is assigned by Caspari to the space-group C52h; there are two molecules in the unit cell, the molecules ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/131653a0
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  • 9
    Digitale Medien
    Digitale Medien
    Negative Polarisation in Fluorescence (1933)
    [s.l.] : Nature Publishing Group
    Nature 131 (1933), S. 204-205 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IN an important paper1 Wawilow has reported measurements on the polarisation of fluorescence of solutions of some dye-stuffs in glycerine, when excited by radiations of different wave-lengths. Using for excitation the radiations from a mercury lamp, isolated by a quartz ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/131204b0
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  • 10
    Digitale Medien
    Digitale Medien
    Electronic Specific Heat of Graphite (1940)
    [s.l.] : Nature Publishing Group
    Nature 145 (1940), S. 388-388 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IN a previous communication1 it was shown that the observed large diamagnetism of graphite along its hexagonal axis is that of its ‘free’ electrons, and is of the Landau type. At high temperatures it conforms to the Curie law K = − nµ2/(3 kT), and at low ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/145388a0
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