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  • Lohmann, Wolfgang  (2)
  • 1980-1984  (2)
Material
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  • 1980-1984  (2)
Year
FID
Subjects(RVK)
  • 1
    Online Resource
    Online Resource
    Notizen: Interaction of Ascorbic Acid with Disulfides
    Walter de Gruyter GmbH ; 1983
    In:  Zeitschrift für Naturforschung C Vol. 38, No. 9-10 ( 1983-10-1), p. 859-861
    Details
    In: Zeitschrift für Naturforschung C, Walter de Gruyter GmbH, Vol. 38, No. 9-10 ( 1983-10-1), p. 859-861
    Abstract: Electron spin resonance (EPR) spectra demonstrate the formation of a complex between the ascorbate ion and disulfides such as oxidized glutathione, cystine, gamma globulin, bovine serum albumin, 4-4′ dithiopyridine, and dithiobutyric acid. However, except in the case of 4-4′ dithiopyridine. ascorbic acid (AH 2 ) is not capable of reducing the disulfide bond in these compounds. These results can be explained in terms of the redox potential of ascorbic acid and its radical semidehydroascorbic acid (SDA). These compounds can reduce the S-S bond of 4-4′ dithiopyridine, the redox potential of which is E′ = -0. 1 V and, thus, more positive than the ones deter­mined for the ascorbic acid system.
    Type of Medium: Online Resource
    ISSN: 1865-7125 , 0939-5075
    URL: Article
    DOI: 10.1515/znc-1983-9-1030
    RVK:
    WA 15000
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1983
    detail.hit.zdb_id: 2078107-6
    SSG: 12
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Paramagnetic Changes in Pulmonary Tumors
    Walter de Gruyter GmbH ; 1981
    In:  Zeitschrift für Naturforschung C Vol. 36, No. 1-2 ( 1981-2-1), p. 5-8
    Details
    In: Zeitschrift für Naturforschung C, Walter de Gruyter GmbH, Vol. 36, No. 1-2 ( 1981-2-1), p. 5-8
    Abstract: Electron spin resonance studies on healthy and tumerous human lung samples have been con­ducted in order to determine possible differences in free radical concentration and shape of the spectra between the different sections of the lung. It could be shown that in healthy lung tissue the signal caused by the sem idehydroascorbate (SDA) radical is not prominent because of the prevailing high partial oxygen pressure. On formation of a tumor, the spin concentration increases, possibly due to the higher metabolic rate; here, the SDA peak is also more pronounced which indicates alterations in the interaction between cell constituents and ascorbic acid. Within the tumor, the spin concentration is considerably reduced which is probably caused by a still higher concentration of ascorbic acid. Addition of ascorbic acid to the different lung specimens enhanced the just described effect while oxidizing substances, such as H 2 O 2 , reversed it.
    Type of Medium: Online Resource
    ISSN: 1865-7125 , 0939-5075
    URL: Article
    DOI: 10.1515/znc-1981-1-203
    RVK:
    WA 15000
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1981
    detail.hit.zdb_id: 2078107-6
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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