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  • 1995-1999  (3)
  • 1980-1984  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Germination tests on thirty-two East African weed species (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 20 (1980), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The seeds of thirty-two species of common East African weeds were set to germinate in the light and in the dark. Eighteen species with more than 40% germination in the light were also germinated in leaf shade and in neutural shade of equal intensity. Germination of fifteen of these was inhibited by darkness, and of sixteen by leaf shade, with complete inhibition in six species. A high degree of dormancy was found in fourteen species. Only one species in this group responded to alternate wetting and drying of the seeds. In eight species dormancy was less in older seeds.The ecological implications of the results are briefly discussed, and comparisons made with temperate weeds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1980.tb00058.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of pre-germination chilling on subsequent growth and flowering in three arable weeds (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 35 (1995), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: This experiment investigated the effect of pre-germination moist chilling of seeds (for 3 weeks at 2^C) of 10 common arable weeds on the subsequent growth and flowering of the plants. In only three of the species (Alopecurus myosuroides Huds., Veronica persica Poir. and Trifolium dubium Sibth.) was flowering markedly increased by the seed chilling treatments. At 3 months, the mean number of flowers and seed heads per plant on the treated plants was greater than that on the controls by factors of 13.9, 2.02 and 1.74 respectively. Shoot lengths of the seed-chilled plants were also significantly greater in all three species, though dry weights did not differ significantly from those of the controls. Thus, the plants showed morphological changes associated with reproduction but no significant alteration in total dry weight. The ecological implications of the data are discussed in relation to possible effects of climatic change on species which require seed vernalization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1995.tb01646.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on chemically induced tumors in rats: I. Heterogeneity of tumor cells and establishment of syngeneic, tumor-specific cytotoxic T cell clones (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 39-47 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Sarcoma P1 was induced in DA rats by DMBA. Anti-P1 antibodies were produced in DA rats, purified via fixed tumor cells and used to induce anti-idiotypic antibodies in syngeneic rats. The anti-idiotypic antibodies were used to generate cytotoxic, P1 specific DA T cells in vitro. These cytotoxic T cells and P1 tumor cells were cloned by limiting dilution. Using the DA anti-P1 specific cytotoxic T cell clones, we were able to characterize 2 types of P1 tumor cell clones, namely those which were susceptible and those which were resistant to the P1 specific cytotoxic T cells. Cytotoxic T cell injected i.v. into syngeneic DA rats could not prevent the development of lethal P1 tumors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01960619
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Cabbage (Brassica oleracea var. Capitata) fails to show wound-induced defence against a specialist and a generalist herbivore? (1996)
    Springer
    Oecologia 108 (1996), S. 105-112 
    Details
    ISSN: 1432-1939
    Keywords: Herbivory ; Wound-induced defence ; Cabbage ; Pieris brassicae ; Spodoptera littoralis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper presents tests of a model of wound-induced defence in herbaceous plants. Many studies have reported both chemical changes in leaves and changes in the behaviour and/or physiology of herbivores as a result of wounding leaves. These studies and others have led to the development of various models to explain wound-induced effects both in terms of plant response and herbivore behaviour. The model under test was proposed by Edwards and Wratten (1987) and predicts that wounding a plant will cause herbivores (1) to take more meals of a smaller size and/or consume less foliage overall (2) grow more slowly and (3) be more mobile. These predictions were tested in cabbage Brassica oleracea L. var. Capitata cv. Pixie with Pieris brassicae L. (Lepidoptera: Pieridae) as a herbivore specialising on cabbage, and Spodoptera littoralis Boisd. (Lepidoptera: Noctuidae) as a generalist herbivore. Both insects showed some reduction in consumption of leaves from upper parts of the plant, but no change in meal size. There were no effects on the growth or mobility of either species as a result of wounding foliage. These results are discussed in relation to the predictions of the model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00333221
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of mollusc grazing on seedling recruitment in artificially created grassland gaps (1996)
    Springer
    Oecologia 106 (1996), S. 240-246 
    Details
    ISSN: 1432-1939
    Keywords: Diversity ; Grazing ; Molluscicide ; Regeneration ; Seed bank
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two experiments conducted in spring and autumn 1992 examined the effect of mollusc grazing on seedling regeneration from natural grassland seedbanks by creating artificial gaps in plots in a grassland sward. Molluscs were excluded from half the gaps by application of molluscicide. Mollusc grazing in both the spring and autumn experiment significantly reduced seedling recruitment, though the intensity of grazing was greatest in autumn. Recruitment of five species was markedly influenced by molluscicide application. In spring, plots from which molluscs were excluded contained significantly more seedlings of Chenopodium polyspermum and Ranunculus acris. In the autumn, exclusion of molluscs resulted in increased populations of R. acris, Stellaria graminea and Rumex acetosa. Cerastium holosteoides populations were greatest in autumn grazed plots. Other species, notably the grasses Holcus lanatus and Agrostis capillaris and the legume Trifolium repens were unaffected by molluscicide application. Species diversity was significantly decreased by molluscicide application in the autumn. Gap size significantly affected the recruitment of two species. Ranunculus acris populations were significantly higher in small gaps in both spring and summer, while Chenopodium recruitment in the spring was greater in small gaps. Gap size also significantly influenced the risk of mollusc attack on Ranunculus as molluscs appeared to show an aggregative feeding response in the high seedling density small gaps. Selective grazing of vulnerable seedlings by molluscs may influence the eventual relative proportions of the species present and so provide a potent mechanism in shaping community composition in grasslands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328604
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    Paper (German National Licenses)
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