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  • 1985-1989  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    Effects of Isoproterenol on Synaptic Ribbons in Pinealocytes of the Rat and C57BL/6J Mouse (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of pineal research 7 (1989), S. 0 
    Details
    ISSN: 1600-079X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Synaptic ribbons (SR) in melatonin-deficient pinealocytes of the C57BIV6J mouse were quantitatively compared to SR in pinealocytes of the rat after β-adrenergic receptor activation by isoproterenol. Two populations of SR comprising synaptic spherules (SRsp) and synaptic rods (SRr) were described in both the mouse and the rat, but species differences existed in the ratio of SRr to SRsp. Isoproterenol caused a significant increase in frequency of SR of the rat but had little or no effect on SR populations in the mouse. It is unlikely that β-adrenergic receptors are absent on mouse pinealocytes or were not activated since isoproterenol elevated plasma renin concentrations indicating activation of β-adrenergic receptors. Furthermore the pineal of both species receives heavy sympathetic input. These findings indicate that the role and regulation of pinealocyte SR are complex and are functionally linked to β-adrenergic receptors as well as other mechanisms related to the production of melatonin.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1600-079X.1989.tb00453.x
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  • 2
    Digitale Medien
    Digitale Medien
    Effects of experimental design and nitrogen on cabbage butterfly oviposition (1989)
    Springer
    Oecologia 80 (1989), S. 211-214 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Pieris rapae ; Nitrogen ; Brassica ; Insect-plant interactions ; Nutritional ecology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary To test the prediction that P. rapae egg densities increase with N fertilizer in large-scale systems as they do in model systems with potted plants, we used field experiments with Brassica oleracea var. acephala L. (collards and kale) planted in pots or large field plots, and treated with different levels of nitrogen fertilizer. In small-scale field experiments with potted kale and collards, egg densities were significantly higher on plants with high N than those with low N. But in larger scale experiments with field-grown collards, average seasonal P. rapae egg densities were not significantly correlated with leaf N content. These differences among experiments did not depend on the magnitude of the difference in foliage N levels.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00380153
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  • 3
    Digitale Medien
    Digitale Medien
    The ecological importance of insect frass: allelopathy in eucalypts (1985)
    Springer
    Oecologia 67 (1985), S. 118-120 
    Details
    ISSN: 1432-1939
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Our previously published experiments on allelopathic effects of insect frass in Eucalyptus communities (Silander et al. 1983) have been criticized on the grounds that our estimates of annual frass production were exscessive (Ohmart 1985). However, we spanned the entire array of estimates of frass fall available from eucalypt communities, and we demonstrated allelopathic effects at even the lowest levels suggested by Ohmart. We suggest that average values of frass fall per hectare are irrelevant because they ignore both large scale variation among sites in time and space, and small scale variation in patchiness of frass accumulation. At the ecological scales relevant to germinating seeds, frass concentrations in local pockets may be considerably higher than the averages calculated for the entire ground surface.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00378461
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