Brass, Paul R., Language, Religion and Politics in North India, Cambridge, University Press, 1974, 467 p
In: Études internationales, Band 7, Heft 4, S. 621
ISSN: 1703-7891
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In: Études internationales, Band 7, Heft 4, S. 621
ISSN: 1703-7891
In: Cahiers du monde russe et soviétique, Band 3, Heft 4, S. 564-581
In: Bulletin de la Classe des Sciences de l'Académie Royale de Sciences, des Lettres et des Beaux-Arts de Belgique, Band 7, Heft 7, S. 423-452
The celebrated X-ray fiber diagram obtained by Rosalind Franklin for the paracrystalline phase of B-DNA is examined at a non technical level. The most prominent features of the intensity distribution in the diagram are reviewed in relation to the corresponding structural properties of the molecule. Optical diffraction experiments (optical trans¬ forms) are performed to reproduce each of several features separately, namely the layer-lines, the maltese cross, the diamond repeats and the missing 4th layer-line. These experiments make use of a single slide (available from the authors on demand) containing a photographic film reduction of four simplified planar models of the DNA backbone which serve as diffraction gratings for the coherent red light of a He-Ne laser or a solid-state laser pointer. No special optics is required. The simulations bring out all of the crucial geometrical parameters of the Watson-Crick double helix. The paper then gives a simple derivation of the formula established by Cochran Crick and Vand (CCV) for the Fourier transform of a helical molecule such as DNA. An application of the CCV theory is made to the computer simulation of wave diffraction by the recently discovered chiral carbon nanotubes which can be described as a collection of regular carbon helices. Computer sim¬ ulated micrographs are compared to observed electron diffractograms of single nanotubes.
In: Bulletin de la Classe des sciences, Band 58, Heft 1, S. 476-480
Définition des espaces homogènes de Lie aux structures r-tangentes. Conditions nécessaires et suffisantes pour qu'un espace homogène puisse être doué d'une structure homogène r-tangente.
In: Bulletin de la Classe des sciences, Band 45, Heft 1, S. 829-838
On attache à chaque point d'une surface R deux quadriques et deux droites dont on détermine les foyers.
In: Recherches sociographiques, Band 13, Heft 2, S. 295
ISSN: 1705-6225
World Affairs Online
In: Revue tiers monde: études interdisciplinaires sur les questions de développement, Band 7, Heft 27, S. 457-460
ISSN: 1963-1359
In: Le débat: histoire, politique, société ; revue mensuelle, Band 184, Heft 2, S. 187-192
ISSN: 2111-4587
In: Cahiers d'économie Politique, Band 40-41, Heft 2, S. 297-301
In: Ecologie & politique: sciences, cultures, sociétés, Band 56, Heft 1, S. 155
ISSN: 2118-3147
In: Annales historiques de la Révolution Française, Band 330, Heft 1, S. 159-163
ISSN: 1952-403X
In: Défense nationale: problèmes politiques, économiques, scientifiques, militaires, Band 38, Heft 5, S. 91-107
ISSN: 0035-1075, 0336-1489
World Affairs Online