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  • Articles: DFG German National Licenses  (4)
  • 1960-1964  (4)
  • 1920-1924
  • 1820-1829
  • 1962  (4)
  • Ion exchange  (2)
  • Natural products  (2)
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  • Articles: DFG German National Licenses  (4)
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  • 1960-1964  (4)
  • 1920-1924
  • 1820-1829
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 1 (1962), S. 98-111 
    ISSN: 0570-0833
    Keywords: Mass spectrometry ; Natural products ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass spectrometry is a very useful method for the determination of the structure of organic compounds although the technique has not yet been widely employed in this field. Of particular interest is the high sensitivity of the instrument, making possible the use of very small amounts of sample, and the information obtainable regarding the size of the molecule and position of the groups therein. A certain volatility is required and the choice of a suitable derivative is, therefore, sometimes of importance. The fragmentations of the molecules in the ion source may be considered as reactions of “carbonium ions without solvent.” The application of the method in the determination of the structure of some natural products is outlined, using lipids, amino acids, peptides and alkaloids as examples.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 1 (1962), S. 149-155 
    ISSN: 0570-0833
    Keywords: Ion exchange ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid ion exchangers have certain advantages over conventional solid ion exchange resins. For example, they make possible the removal of ionic species from solutions of relatively high concentration. Because of favorable distribution factors, the number of stages needed for a practical degree of extraction is usually low. Typical liquid ion exchangers are amines or alkyl phosphoric acids in the molecular weight range 250-500.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 1 (1962), S. 178-195 
    ISSN: 0570-0833
    Keywords: Enzyme catalysis ; Natural products ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Micro-organisms form enzymes that catalyze many reactions which are difficult to carry out in the laboratory or which involve many steps. Enzymes even react with substances which are normally foreign to them. The frequently high stereospecificity of microbiological reactions is of particular significance. The most important types of reactions are: hydroxylations, dehydrogenations (oxidations), and hydrogenations (reductions), cleavage of ester and C-C bonds, and transglycosidations. The variety of the compounds converted is extremely great.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 1 (1962), S. 440-453 
    ISSN: 0570-0833
    Keywords: Ion exchange ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Many theories of ion-exchange column performance, differing widely in their simplifying assumptions and their results, have been advanced. For successful application it is vital to choose, in each particular case, the most appropriate theory. this requires a thorough general understanding of the phenomena and a precise knowledge of the consequences of the simplifying assumptions. The most important qualitative characteristics of ion-exchange columns are outlined, especially the formtion of self-sharpening and non-sharpening boundaries and of constant and proportionate patterns. The commonly used quantitative theories and calculation methods are then discussed and their adequacy, their shortcomings, and the ranges of their applicability are critically studied.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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