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  • 1
    Electronic Resource
    Electronic Resource
    A Synthetic Differential Growth Inhibitor (1943)
    [s.l.] : Nature Publishing Group
    Nature 151 (1943), S. 195-195 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT has been shown1,2,3 that malt, ungerminated grain and oranges contain a water-soluble, thermostable substance which permits the free growth of epithelial tissues in vitro at concentrations at which it inhibits totally the growth of fibroblasts and other mesenchyme cells. In ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/151195a0
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  • 2
    Electronic Resource
    Electronic Resource
    Penicillamine, a Characteristic Degradation Product of Penicillin (1943)
    [s.l.] : Nature Publishing Group
    Nature 151 (1943), S. 107-107 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WE noticed more than nine months ago that acid hydrolysates of penicillin gave a strong blue-violet coloration with the ninhydrin reagent. Afterwards it was found that, under standardized conditions of hydrolysis, the colour intensity given by numerous penicillin preparations of varying degrees ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/151107a0
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  • 3
    Electronic Resource
    Electronic Resource
    Conversion of Hydrastine into Berberine, and an Instance of the Asymmetrical Quaternization of a Tertiary Base (1950)
    [s.l.] : Nature Publishing Group
    Nature 166 (1950), S. 271-272 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Reduction of 1-a-narcotine with lithium aluminium hydride affords a glycol (I), melting point 134°, WD -10-4° in N/10 hydrochloric acid. This base forms a characteristic methiodide and an O-diacetyl-derivative, melting point 165-6° (decomp.). 1-p-Narcotine, on reduction under similar ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/166271a0
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of a Reference Compound derived from Sanguinarine and Chelerythrine (1950)
    [s.l.] : Nature Publishing Group
    Nature 165 (1950), S. 235-235 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The methosulphate of the latter base was changed by double decomposition into the methochloride, melting point 207-210 (found, C, 60-3 ; H, 6-2 ; Cl, 7-6 per cent, indicating C22H22O4NC1,2H2O), which is the tetramethoxy-analogue of sanguinarine chloride (2CH2O2) and chelerythrine chloride ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/165235a0
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of Hydrastine (1950)
    [s.l.] : Nature Publishing Group
    Nature 165 (1950), S. 529-529 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] However, by partial racemization of natural Z-hydrastine an optically active stereoisomeride was obtained, and a comparison of the rotatory powers made it clear that natural hydrastine and natural narcotine are of different stereochemical configuration2. Adopting the convention that natural ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/165529a0
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of a Substance Containing the Chelerythrine-Sanguinarine Skeleton (C, N, O) (1949)
    [s.l.] : Nature Publishing Group
    Nature 164 (1949), S. 402-402 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE skeleton indicated is (I) and we first attempted an extension of the method whereby (II) had been synthesized in 19371. ... However, cyclization of 1-formamido-6 : 7-dimethoxy-2-(2′-bromo-4′ : 5′-dimethoxy)phenyl-1 : 2 : 3 : 4-tetrahydronaphthalene could not be effected. R. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/164402a0
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  • 7
    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] I WOULD like to congratulate the authors on these syntheses, which are fundamental for the theory. My own synthesis, mentioned in 1936, employed acetonedicarboxylic acid in excess, but was otherwise identical. Though the product was undoubtedly dl-hygrine, the opportunity to add the final ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/163289b0
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  • 8
    Electronic Resource
    Electronic Resource
    Structure and Biogenesis of Emetine (1948)
    [s.l.] : Nature Publishing Group
    Nature 162 (1948), S. 524-524 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN making favourable comment on Woodward's ingenious suggestion respecting the biogenesis of strychnine1, the hope was expressed that further speculation of a similar kind would be based on a comparable “degree of coincidence”. The remarkable development mentioned below certainly ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/162524a0
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of Vomipyrine (1948)
    [s.l.] : Nature Publishing Group
    Nature 162 (1948), S. 177-178 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] AN outstanding result of Wieland's long series of investigations of vomicine was the degradation of the alkaloid to a base, C15H16N2, termed vomipyrine1. This afforded yellow salts, and the spectrochemical behaviour clearly indicated its ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/162177a0
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  • 10
    Electronic Resource
    Electronic Resource
    Structure of Cyclopropane (1948)
    [s.l.] : Nature Publishing Group
    Nature 161 (1948), S. 176-176 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ALTHOUGH I am pleased to note that Dr. A. D. Walsh has made a final contribution to this discussion, it may nevertheless be possible to correct a mis-statement. He says1 that I take the usual formula to represent only the position in space of the atoms involved. What I actually ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/161176c0
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