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  • 1
    Digitale Medien
    Digitale Medien
    The toxicological properties of impurities in malathion (1978)
    Springer
    Archives of toxicology 42 (1978), S. 95-106 
    Details
    ISSN: 1432-0738
    Schlagwort(e): Malathion ; Isomalathion ; Trimethyl phosphorothioates ; Acetylcholinesterase ; Carboxylesterase ; Potentiation of toxicity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract During a malaria eradication programme in Pakistan in 1976, out of 7,500 spraymen, 2,800 became poisoned and 5 died. The major determinant of this poisoning has been identified as isomalathion present as an impurity in the malathion. It seems almost certain that the isomalathion was produced during storage of the formulated malathion. The quantitative correlation found between isomalathion content and toxicity of many field samples of malathion has been confirmed by an examination of mixtures of pure compounds. Addition of known amounts of isomalathion to technical malathion indicates that other active substances are present. These impurities have been identified (trimethyl phosphorothioates) and have been shown to behave like isomalathion in potentiating the toxicity of malathion. Some preliminary work on their toxicological properties is reported. The mechanisms involved in the potentiation of the toxicity of malathion are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00316489
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  • 2
    Digitale Medien
    Digitale Medien
    Ferrochelatase activity inAzospirillum brasilense with reference to the influence of metal cations (1989)
    Springer
    BioMetals 2 (1989), S. 31-35 
    Details
    ISSN: 1572-8773
    Schlagwort(e): Heme synthesis ; Iron metabolism ; Membranes ; Cation inhibition ; Metalloporphyrin
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Summary Ferrochelatase in membrane preparations fromAzospirillum brasilense displayed an activity of 2.17 μmol protoheme formed · h−1 · mg protein−1 which is 10-fold greater than previous reports for other bacteria. This ferrochelatase showed an apparentK m of 20.9 μM for Fe2+, a pH optimum of 6.0–6.5, and stimulation by oleic or stearic acids. Co2+, Cu2+ and Zn2+ inhibited the incorporation of Fe2+ into protoporphyrin IX while Ni2 and Mg2+ had no effect on protoheme synthesis. Activity with Fe2+ and mesoporphyrin IX was less than with protoporphyrin IX but deuteroporphyrin IX produced the highest rate of protoheme synthesis. The membrane fraction containing ferrochelatase activity was found to insert Cu2+, Ni2+, Zn2+ and Co2+ enzymatically into protoporphyrin IX to produce metalloporphyrins. Cu2+ incorporation into protoporphyrin IX proceeded at a rate greater than with Fe2+ and theK m for Cu2+ was 21.9 μM.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01116198
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  • 3
    Digitale Medien
    Digitale Medien
    Problems in heathland and grassland dynamics (1981)
    Springer
    Plant ecology 46-47 (1981), S. 61-74 
    Details
    ISSN: 1573-5052
    Schlagwort(e): Allelopathy ; Competition ; Disease ; Dispersal ; Fire ; Grassland ; Grazing ; Heathland ; Soil ; Stability
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A review of factors governing vegetation change in heathlands and grasslands is presented, with emphasis on soil factors. Climate, microclimate, fire, fauna, grazing by vertebrates, grazing by invertebrates, disease, dispersal, establishment, competition, allelopathy, stabilization, soil formation and podzolization are discussed with emphasis on inconsistencies and lacks in our present knowledge. Examples are mainly from NW European Calluna heath and related woodlands.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00118384
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