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  • Nerve cells  (2)
  • Springer  (2)
  • Cambridge University Press
  • Institute of Physics
  • 2000-2004
  • 1980-1984
  • 1975-1979  (2)
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Keywords
Publisher
  • Springer  (2)
  • Cambridge University Press
  • Institute of Physics
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    The role of nerve cell density in the regulation of bud production in hydra (1978)
    Springer
    Development genes and evolution 184 (1978), S. 95-108 
    Details
    ISSN: 1432-041X
    Keywords: Hydra ; Nerve cells ; Cell differentiation ; Budding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The role of nerve cell density in the regulation of bud production in hydra was examined. Animals with different rates of bud production were produced by altering the temperature, population density and illumination of their cultures. When the distribution of cell types was examined in animals with different rates of bud production, the density of nerve cells in those animals was found to be correlated with their rate of bud production. Transfer of animals from one environment to another resulted in immediate changes in the rate of differentiation of large interstitial cells into nerve cells. This suggests that the density of nerve cells may play a role in regulating the rate of bud production in hydra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848219
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  • 2
    Electronic Resource
    Electronic Resource
    Cellular mechanisms of stimulation of bud production in Hydra by low levels of inorganic lead compounds (1977)
    Springer
    Cell & tissue research 177 (1977), S. 555-570 
    Details
    ISSN: 1432-0878
    Keywords: Hydra ; Budding ; Differentiation ; Nerve cells ; Lead
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Treatment of Hydra with subtoxic levels of inorganic lead compounds (lead nitrate and lead chloride) for periods ranging from 5 min to one hour causes a temporary increase in bud production as compared to untreated control animals. This effect can be inhibited by the addition of large amounts of calcium chloride to the culture medium. The increased rate of budding is preceded by a dramatic increase in the number of nerve cells per animal, which is first observed within six hours after lead treatment. This appears to be the result of an increased rate of mitosis in the undifferentiated interstitial cells and their subsequent differentiation into nerve cells. The total number of cells per animal also increases after exposure to lead compounds, suggesting that lead may act as a general mitotic stimulator of all dividing cell types in Hydra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220614
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    Paper (German National Licenses)
    Fulltext
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