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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 181 (1977), S. 203-213 
    ISSN: 1432-041X
    Keywords: Interstitial cell ; Position-dependent differentiation ; Hydra ; Nematocyte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The axial position of interstitial-cell (i-cell) differentiation into nematocytes inHydra was studied. Nests of developing nematoblasts of three types of nematocytes were distributed in a non-uniform manner along the body column. Stenotele nematoblasts were distributed in a gradient with a maximum in the peduncle. Desmoneme and atrichous isorhiza nematoblasts were found predominantly in the upper half of the body region. These results suggest that the type of nematocyte differentiation an i-cell undergoes is influenced by the axial position of the i-cell. Because the assayed stage of nematocyte differentiation occurred 6–7 days after beginning of differentiation, the axial position of the anticedent i-cell at the time of commitment was determined by correcting for tissue displacement.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 187 (1979), S. 323-328 
    ISSN: 1432-041X
    Keywords: Nerve-depletedhydra ; Morphogenetic substances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary By a double colchicine treatment the nerve-cell population ofhydra was reduced to less than 1% of the normal complement. Such severely nerve-depletedhydra contained normal or higher than normal concentrations of head activator, head inhibitor, foot activator and foot inhibitor which in normal animals are produced by nerve cells. According to typical chromatographic properties all four morphogenetic substances were chemically identical to those found in normal animals. It is suggested that in nervedepletedhydra the epithelial cells, as the only remaining cell type, have taken over the morphogen-producing function of nerve cells.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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