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  • 1980-1984  (2)
  • 1965-1969  (2)
  • 1930-1934
  • 1920-1924
  • 1870-1879
  • 1983  (2)
  • 1966  (2)
  • Analytical methods
  • 1
    Electronic Resource
    Electronic Resource
    Holographic Methods for the Investigation of Photochemical and Photophysical Properties of Molecules (1983)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 22 (1983), S. 582-598 
    Details
    ISSN: 0570-0833
    Keywords: Analytical methods ; Holography ; Photochemistry ; Photophysics ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Holography is most frequently thought of as a method of photography that results in three-dimensional images of the object being photographed. It is certainly true that this is the most visually spectacular aspect. But holography can also be used as a powerful tool for the investigation of a variety of photochemical and photophysical processes. These experimental techniques rely on the fact that small spatial modulations of a material's optical properties (index of refraction and absorption coefficient) can deflect an incident light beam into another direction. By following the growth or decay in intensity of this deflected beam, one can follow the underlying photochemical and photophysical processes producing the changes in optical properties. If a CW laser is used to produce the hologram one can use the technique to investigate solid state photochemistry. If a pulsed laser is used one can investigate a broad range of time dependent processes; energy transfer, diffusion, rotational relaxation, charge transport etc. Compared to conventional spectroscopic techniques the holographic method shows various advantages. So for example it is a highly sensitive zero-background technique and permits free choice of detection wavelength and detection beam intensity.As a result of information obtained using the holographic technique as a scientific tool, one can also find new classes of materials for the recording of holograms. This is the way in which two-photon four-level systems for hologram recording process gated on and off with an auxiliary source, and can be read with the infrared recording laser with no erasing of the hologram.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198305821
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    From Environmental Analytical Chemistry to Ecotoxicology - A Plea for More Concepts and Less Monitoring and Testing (1983)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 22 (1983), S. 380-389 
    Details
    ISSN: 0570-0833
    Keywords: Environmental chemistry ; Toxicology ; Ecotoxicology ; Analytical methods ; Chemistry of the future ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The development of cultural and technical civilization has been marked with increasing interference in hydrogeochemical cycles and the production of a growing number of chemicals; this is accompanied by a growing concern on the potential adverse effects of chemicals on biological systems. Assessment of the potential toxicological and ecological effects of pollutants is of central importance. We are of the opinion that this cannot be accomplished by merely evaluating the harmfulness of a substance on the basis of toxicity tests with individual organisms and by monitoring analytically the environment for pollutants. We would like to encourage chemists to participate in the solution of ecotoxicological problems: chemodynamical concepts permit the estimation-on the basis of physical-chemical generalizations and with the help of compound-specific data-of the fate, the distribution, the potential for bioaccumulation in the food chain, and the approximate residence time of pollutants (and thus the attainable residual concentrations) in the environment and therefore to predict the relative risk of different pollutants.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198303801
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An Apparatus for Titrations in Liquid AmmoniaTo Prof. Dr. F. Patat on the occasion of his 60th birthday (1966)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 5 (1966), S. 554-557 
    Details
    ISSN: 0570-0833
    Keywords: Titration ; Liquid ammonia ; Analytical methods ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An apparatus for titrations in liquid ammonia is described. The titrations can be carried out in the absence of air, and the utility of the apparatus is demonstrated for a number of conductometric and potentiometric titrations.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196605541
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Electron Pyrolysis, a New Method of Organic Microanalysis (1966)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 5 (1966), S. 751-759 
    Details
    ISSN: 0570-0833
    Keywords: Pyrolysis ; Analytical methods ; Electron pyrolysis ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organic compounds incubated with tritiated water of specific activity 5 Ci/ml are specifically fragmented. The β-active fragments can be detected in very small quantities by chromatographic separation. Chemical identification of these fragments provides information about the original compounds, as has been shown by experiments with amino acids, esters, lactones, amides, quinones, terpenes, nitrogen-sulfur heterocycles, and natural products.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196607511
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    Paper (German National Licenses)
    Fulltext
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