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  • Electron microscopy  (2)
  • Pissodes strobi  (2)
  • Springer  (4)
  • American Geophysical Union (AGU)
  • 1975-1979  (4)
Collection
Keywords
Publisher
  • Springer  (4)
  • American Geophysical Union (AGU)
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Host preference ofPissodes strobi peck (Coleoptera: Curculionidae) reared from three native hosts (1977)
    Springer
    Journal of chemical ecology 3 (1977), S. 377-389 
    Details
    ISSN: 1573-1561
    Keywords: Pissodes strobi ; ecotype ; phytophagy ; speciation ; host selection ; feeding bioassay ; weevil ; dispersal ; chemoreception ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In forced feeding bioassays,Pissodes strobi reared from eastern white pine, Engelmann spruce, or Sitka spruce failed to discriminate between these three host species. However, results of choice feeding bioassays suggest that eastern white pine is the ancestral host of the two westernP. strobi populations. Comparative feeding data obtained under conditions of choice support the hypothesis thatP. strobi has dispersed westward across the North American continent, adapting its host selection behavior in turn to Engelmann spruce and then Sitka spruce. WhereasP. strobi reared from eastern white pine preferred to feed on its natural host rather than on the two western spruces,P. strobi reared from Engelmann spruce did not discriminate between eastern white pine and its natural host, Engelmann spruce, but fed significantly more on these two hosts than on Sitka spruce.P. strobi reared from Sitka spruce, on the other hand, fed equally on all three native host species. Our data support the contention of Smith and Sugden (1969) that the two western weevils are eco types ofP. strobi. Comprehensive research on behavioral adaptations to new host species may allow the threeP. strobi populations to be distinguished as legitimate ethospecies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988181
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  • 2
    Electronic Resource
    Electronic Resource
    Resistance of western white pine to feeding and oviposition byPissodes strobi peck in western canada (1978)
    Springer
    Journal of chemical ecology 4 (1978), S. 641-647 
    Details
    ISSN: 1573-1561
    Keywords: Pissodes strobi ; weevil ; host selection ; phytophagy ; oviposition ; chemoreception
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Forced and choice feeding and oviposition experiments were conducted by caging overwinteredPissodes strobi on lateral branches or leaders of sympatric Engelmann spruce and/or western white pine trees in Manning Provincial Park, British Columbia, or on transplanted, potted trees in Burnaby, British Columbia. Whereas femaleP. strobi preferred to feed on 1-year-old Engelmann spruce lateral branches in both the forced- and choice-feeding experiments, male weevils failed to discriminate between this host and western white pine. Forced-feeding experiments that utilized 1-year-old leaders demonstrated that western white pine is an acceptable host forP. strobi feeding, but that the native host, Engelmann spruce, is preferred under choice conditions. In all experiments, female weevils oviposited only on Engelmann spruce. These results indicate that the releasing stimulus for feeding is present in the bark of both conifer species and suggests that a separate releasing stimulus for oviposition is absent from western white pine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00990274
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  • 3
    Electronic Resource
    Electronic Resource
    An investigation of the foetal rat spinal cord (1975)
    Springer
    Cell & tissue research 158 (1975), S. 241-249 
    Details
    ISSN: 1432-0878
    Keywords: Synapse development ; Spinal cord ; Foetal rat ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultrastructural studies on the foetal rat spinal cord show that during synaptogenesis there is difficulty in recognizing true synaptic precursors. Asymmetric densities are found at unusual sites forming, for example, somato-dendritic and somato-somatic junctions. They are also found between neurons and possible glial processes. Symmetric densities occur between nerve cells but may be confused with desmosomes. Profiles exhibiting membrane density, cleft material and 50 nm vesicles, which are the most reliable indicators of presumptive synapses, are found between neurones, but also at junctions between neurones and what may be glial processes. The picture is further confused by the presence of degenerating axodendritic synapses at early foetal stages. Caution must be exercised in defining an apparent synapse or precursor in foetal cord as that of a presumptive functional synapse because of the observed degenerating profiles and because to our knowledge, somato-somatic, somatodendritic, and neurono-glial synapses have not been observed in adult cord. It is not known whether these structures are an unwanted consequence of development or play a role in guiding development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219963
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrastructural alterations in skeletal muscle fibers of streptozotocin-diabetic rats (1976)
    Springer
    Cell & tissue research 168 (1976), S. 239-246 
    Details
    ISSN: 1432-0878
    Keywords: Muscle ; Diabetes mellitus ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of fast-twitch-oxidative-glycolytic (FOG), fasttwitch-glycolytic (FG) and slow-twitch-oxidative (SO) fibers in plantaris and soleus muscles of normal and streptozotocin-diabetic rats was studied. In the diabetic animals, the mitochondria of FOG and SO fibers showed a loss of cristae and an increase in electron-dense granules. There was also an increased number of lipid droplets in close proximity to the mitochondria and the nuclei, and a separation of individual muscle nuclei to form satellite cells. Higher incidences of surface projections and sarcoplasmic splittings at the nuclear region were noticed in SO fibers. The FG fibers showed some disorientation of the T-tubular system. It is concluded that streptozotocin-diabetes has differential effects on the fine structure of the three fiber types of rat skeletal muscle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215880
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