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  • Seasonal Forest climate  (1)
  • Streptozotocin  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Attenuation of streptozotocin diabetes with superoxide dismutase-like copper(II)(3,5-diisopropylsalicylate)2 in the rat (1983)
    Springer
    Diabetologia 24 (1983), S. 437-440 
    Details
    ISSN: 1432-0428
    Keywords: Copper ; superoxide dismutase ; rats ; Streptozotocin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Experimental diabetes can be produced by agents with specific toxicity for pancreatic islet B cells. This effect has been reported to be modified both in vitro and in vivo by various radical scavengers including the enzyme Superoxide dismutase. Copper(II)(3,5-diisopropylsalicylate)2 is lipophilic and possesses Superoxide dismutase bioactivity. Prior administration of this compound to male rats appeared to attenuate the severity of streptozotocin-induced diabetes as assessed by glycosuria and glucose tolerance. Diisopropylsalicylate, which has no Superoxide dismutase activity, did not alter the severity of streptozotocin-induced diabetes. Rats treated with the copper complex, with Streptozotocin or with a combination of the two agents gained 50% less weight than untreated controls, or rats treated with diisopropylsalicylate. The attenuation of diabetes by the copper-complex may represent partial protection of the B cells against Streptozotocin damage, although an extrapancreatic, toxic effect cannot be ruled out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257343
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the relationship of phenological strategy to ecological success: the case of broomsedge in Hawaii (1991)
    Springer
    Plant ecology 95 (1991), S. 137-147 
    Details
    ISSN: 1573-5052
    Keywords: Bunchgrass ; Rain Forest climate ; Savanna vegetation ; Seasonal Forest climate ; Seasonality ; Summer Drought climate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Andropogon virginicus L. (broomsedge) is a perennial bunchgrass of temperate origin which was introduced to the Hawaiian Islands early in the 20th Century. Since its introduction broomsedge has become the dominant species of savanna vegetation on the windward sides of Oahu and Hawaii (the Big Island). Despite its ecological success, the phenology of broomsedge-especially the timing of its periods of active growth in the summer and dormancy (or semi-rest) in the winter-is not synchronized with the summer-dry, winter-wet moisture seasonality of its range in Hawaii. Rather, this species responds to a shortening-daylength cue by flowering in late autumn, and the onset of dormancy and the progression of subsequent phenophases seems to be mostly under endogenous control following the flowering response. The lack of synchronization between the onset of active growth by broomsedge and the onset of the rainy season does not conform to the specific assumption that the ecological dominance of the perennial bunchgrass life-form in savanna vegetation results from a coupling of phenological strategy to moisture seasonality. It also brings into question the more general assumption that a perfect coupling of phenology to the prevailing climatic conditions is a prerequisite for ecological success.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00045212
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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