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  • Articles: DFG German National Licenses  (2)
  • Electronic Resource  (2)
  • 1980-1984  (2)
  • 1975-1979
  • 1960-1964
  • 1982  (2)
Source
  • Articles: DFG German National Licenses  (2)
Material
  • Electronic Resource  (2)
Years
  • 1980-1984  (2)
  • 1975-1979
  • 1960-1964
Year
  • 1
    Electronic Resource
    Electronic Resource
    Reactions of singlet oxygen in humic waters (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 12 (1982), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. The oxidation of 2, 5-diniethylfuran (DMF) to cis-1, 2- diacetylethylene (DAE) is a specific test for singlet oxygen (1O2). A method has been developed for the measurement of DAB by direct injection gas chromatography. By the use of this method, the photochemical generation of 1O2 has been demonstrated in samples of two Canadian humic waters.Two other photochemical reactions probably mediated by 1O2generation, the oxidation of histidine and the inactivation of a-chymotrypsin, have been demonstrated in these waters.The possible ecological and environmental implications of these findings are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1982.tb00622.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Demography of the twospotted spider mite, Tetranychus urticae Koch (1982)
    Springer
    Oecologia 52 (1982), S. 389-395 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A simple life table model was constructed for Tetranychus urticae in which daily survivorship of eggs and motil stages, fecundity, and development time was altered to assess the impact of each parameter on the intrinsic rate of increase. r. Interpretation of the trade-offs focused on management considerations. A second aspect of the study concerned age and stage structure in mite populations including the time path of convergence to a stable age distribution and the effect of changes in birth and death rates on the age profile. The stable stage distributions of 7 tetranychid mite species were computed using 25 separate life tables. In spite of the wide range of r-values induced by different experimental conditions, all of the stage distributions were quite similar averaging roughly 66% eggs, 26% immatures, and 8% adults. Several population studies were cited which reported stage distributions of growing mite populations. The empirical evidence suggested that natural mite populations are often quite near this stable distribution. A practical problem involving the extent to which hormoligosis (insecticide stimulation) affects mite population growth rate was addressed using the life table model and laboratory data from controlled studies. The findings suggested that mite populations treated with insecticide may attain a 1.4- to a 4.2-fold difference in population size relative to an untreated population after 2 generations and over a 1,300-fold potential difference after 10 generations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00367964
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    Paper (German National Licenses)
    Fulltext
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