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  • Nature Publishing Group  (28)
  • Wiley  (7)
  • American Association of Petroleum Geologists  (3)
  • 1945-1949  (38)
  • 1
    Electronic Resource
    Electronic Resource
    A Synthesis of iso -Pelletierine and Methyl iso -Pelletierine (1949)
    [s.l.] : Nature Publishing Group
    Nature 164 (1949), S. 501-501 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ACCORDING to Robinson's1 theory of the biogenesis of alkaloids, the piperidine (that is, coniine) group of alkaloids is derived from iso-pelletierine (I) and methyl iso-pelletierine (II), which are formed by the condensation of δ-amino- and δ-methylamino-valer-aldehydes ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/164501a0
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of Chemical Purity (1949)
    [s.l.] : Nature Publishing Group
    Nature 164 (1949), S. 503-503 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN developing the isotope dilution method of amino-acid analysis, we have been concerned with the difficulty of proving the purity of the isolated sample of ammo-acid, upon which the accuracy of the determination depends. Elementary analysis and the estimation of reactive groups are not always ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/164503a0
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  • 3
    Electronic Resource
    Electronic Resource
    An Exchange Reaction Involving Alkyl Oxygen and Sulphur (1949)
    [s.l.] : Nature Publishing Group
    Nature 164 (1949), S. 365-365 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] INCIDENTAL to the preparation of some sulphur analogues of the synthetic female sex hormones1, we have been studying the relative stability of anisole and thioanisole to various acidic and basic reagents. In one experiment we heated anisole (1 mole), thiophenol (1 mole) and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/164365a0
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  • 4
    Electronic Resource
    Electronic Resource
    Syntheses of Hygrine and Cuscohygrine (1949)
    [s.l.] : Nature Publishing Group
    Nature 163 (1949), S. 289-289 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN his theory of the phytochemical synthesis of alkaloids published in 1917, Robinson1 suggested that hygrine (I) and cuscohygrine (II) were formed by the condensation of acetone dicarboxylic acid, with one and with two molecular proportions respectively of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/163289a0
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  • 5
    Electronic Resource
    Electronic Resource
    Fractional Distillation and Its Application in the Concentration of the Heavy Isotopes of Oxygen and Hydrogen (1948)
    [s.l.] : Nature Publishing Group
    Nature 161 (1948), S. 858-859 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] previous communication1 we described a convenient type of fractionating column suitable for the concentration of the heavy isotopes of oxygen and hydrogen in water. The glass assembly was efficient for comparatively slow distillations and was capable of producing valuable enrichments of O18 in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/161858a0
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  • 6
    Electronic Resource
    Electronic Resource
    Reactions of Organic Halides in Solution (1947)
    [s.l.] : Nature Publishing Group
    Nature 159 (1947), S. 166-166 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WE are sorry to have again to contradict Dr. Evans, but he continues to misrepresent us1. He does so now by quoting a limited passage from a paper by one of us2, and then adding, as though it were a paraphrase, a statement of his own that does not, in fact, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/159166a0
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  • 7
    Electronic Resource
    Electronic Resource
    Polymerization of a Semiquinone Ion (1947)
    [s.l.] : Nature Publishing Group
    Nature 159 (1947), S. 612-612 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE most recent theory of the structure of Wurster type dyes (oxidation products of p-phenylenediamines) is that of Granick and Michaelis1. One of their main conclusions was that polymerization of a semiquinone ion of the type depicted below is impossible when all the amino ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/159612b0
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  • 8
    Electronic Resource
    Electronic Resource
    Perilobular Spaces in the Rabbit Pancreas (1946)
    [s.l.] : Nature Publishing Group
    Nature 158 (1946), S. 418-419 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Kühne and Lea in 18821 described (but did not illustrate) two kinds of lobule in the rabbit pancreas: (a) a lobule smooth on the surface and in which the cell boundaries of the acinar cells cannot be distinguished; (b) a lobule irregular on the surface like a mulberry and in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/158418c0
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  • 9
    Electronic Resource
    Electronic Resource
    The Fischer Indole Synthesis (1949)
    [s.l.] : Nature Publishing Group
    Nature 164 (1949), S. 835-835 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE recently suggested theory of Pausacker and Schubert1 involving free radicals in the Fischer indole synthesis appeared to us improbable. It seemed more likely that these experimental results could be explained quite readily by hydrolyses of the hydrazones and recombination to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/164835a0
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  • 10
    Electronic Resource
    Electronic Resource
    Alkaloids of the Australian Rutaceæ (1948)
    [s.l.] : Nature Publishing Group
    Nature 162 (1948), S. 223-224 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN certain tribes of the family Rutaceæ a relatively high proportion of species has been found to contain alkaloids. Moreover, these alkaloids vary widely in character and include representatives of several of the principal structural groups, for example, quinoline, iso-quinoline, carboline and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/162223a0
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