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  • Apidae  (1)
  • KMnO4 oxidation  (1)
  • Springer  (2)
  • American Geophysical Union
  • Oxford University Press
  • 1995-1999
  • 1990-1994  (1)
  • 1985-1989  (1)
  • 1980-1984
Collection
Keywords
Publisher
  • Springer  (2)
  • American Geophysical Union
  • Oxford University Press
Years
  • 1995-1999
  • 1990-1994  (1)
  • 1985-1989  (1)
  • 1980-1984
Year
  • 1
    Electronic Resource
    Electronic Resource
    Changes in soil organic matter with cropping as measured by organic carbon fractions and 13C natural isotope abundance (1993)
    Springer
    Plant and soil 155-156 (1993), S. 399-402 
    Details
    ISSN: 1573-5036
    Keywords: carbon-13 ; cropping systems ; δ13C ; KMnO4 oxidation ; soil organic matter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The decline in soil organic matter with cropping is a major factor affecting the sustainability of cropping systems. Changes in total C levels are relativelyinsensitive as a sustainability measure. Oxidation with different strength KMnO4 has been shown to be a more sensitive indicator of change. The relative size of soil C fractions oxidised by 333 mM KMnO4 declined with cropping, whilst the relative size of the unoxidised fraction increased. Changes in δ13C ratio have been used to measure C turnover in systems which include C3 and C4 species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025067
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Variability of chemosensory stimuli within honeybee (Apis mellifera) colonies: Differential conditioning assay for discrimination cues (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 253-264 
    Details
    ISSN: 1573-1561
    Keywords: Chemosensory cues ; olfaction ; kin recognition ; honeybees ; Apis mellifera ; Hymenoptera ; Apidae ; differential conditioning ; proboscis extension reflex ; learning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Differential training of honeybee workers using the proboscis extension reflex is applied to the problem of evaluating compounds that may potentially provide cues for kin recognition in the honeybeeApis mellifera. These cues were obtained by contaminating glass rods and steel needles with different materials found in the hive. In particular it is shown that workers discriminate between: cuticular waxes from different adult workers; eggs from the same and different hives; similar aged larvae within the same hive; and needles contaminated with the Nasonov gland secretions of different adult workers. It appears that some of these differences are due to phenotypic variation among individuals that cannot be directly attributed to environmental factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01022545
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    Paper (German National Licenses)
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