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  • 1
    Electronic Resource
    Electronic Resource
    Morphogenetic substances in nerve-depletedhydra (1979)
    Springer
    Development genes and evolution 187 (1979), S. 323-328 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00848467
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  • 2
    Electronic Resource
    Electronic Resource
    Oriented migration of interstitial cells and nematocytes inHydra attenuata (1974)
    Springer
    Development genes and evolution 176 (1974), S. 67-88 
    Details
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The migratory properties of hydra cells within the tissue were studied. The extent and direction of cell migration were examined in budding, non-budding, and regenerating animals. Nematocytes and a small number of single big interstitial cells (the multipotent interstitial cells) actively migrate preferentially in an apical direction. Basal migration of these cells occurs only when a bud is present and, in which case, the cells migrate into the developing bud. The regeneration of the hypostome and tentacles does not affect cell migration in either direction, except for apical migration of stenotele nematocytes, which was markedly reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00577831
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  • 3
    Electronic Resource
    Electronic Resource
    Regulation of interstitial cell differentiation inHydra attenuata (1977)
    Springer
    Development genes and evolution 181 (1977), S. 203-213 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00848421
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  • 4
    Electronic Resource
    Electronic Resource
    Head regeneration and polarity reversal inHydra attenuata can occur in the absence of DNA synthesis (1984)
    Springer
    Development genes and evolution 194 (1984), S. 79-86 
    Details
    ISSN: 1432-041X
    Keywords: Hydra ; Morphallactic regeneration ; Polarity reversal ; DNA synthesis ; Epithelial cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Regeneration in hydra is considered to be morphallactic because it can occur in the absence of cell division. Whether DNA synthesis is required for regeneration or other repatterning events is not known. The question was investigated by blocking DNA synthesis with hydroxyurea and examining several developmental processes. Head regeneration, reversal of regeneration polarity and battery cell differentiation all took place in the absence of DNA synthesis. Hence, morphallactic regulation in hydra is independent of both DNA synthesis and mitosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848347
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  • 5
    Electronic Resource
    Electronic Resource
    Untersuchungen über die Symbiose von Tieren mit Pilzen und Bakterien (1936)
    Springer
    Archives of microbiology 7 (1936), S. 391-403 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00407412
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  • 6
    Electronic Resource
    Electronic Resource
    Nematocyte migration in Hydra influenced by tissue polarity (1974)
    [s.l.] : Nature Publishing Group
    Nature 248 (1974), S. 387-390 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In Hydra, migration of the desmoneme nematocytes takes place only in the direction of tissue polarity as defined by which end will regenerate a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/248387a0
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  • 7
    Electronic Resource
    Electronic Resource
    THE NUCLEIC ACIDS OF MYCOPLASMA (1967)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 143 (1967), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1967.tb27650.x
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  • 8
    Electronic Resource
    Electronic Resource
    Epithelial cells of Hydra are dye-coupled (1981)
    [s.l.] : Nature Publishing Group
    Nature 294 (1981), S. 356-358 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The body column of Hydra consists of two layers of epithelial cells, the epidermis and the gastrodermis, arranged in a cylindrical shell with the epidermis on the outside and the gastrodermis lining the gastric cavity. The cells of both layers possess large vacuoles; results of light and electron ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/294356a0
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  • 9
    Electronic Resource
    Electronic Resource
    Über einige neue fluoraktive Stoffe (1950)
    Springer
    Naturwissenschaften 37 (1950), S. 477-477 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00622506
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  • 10
    Electronic Resource
    Electronic Resource
    Über den Einfluss des Heteroauxins auf die Kationenzusammensetzung der Blattasche der Tomate (1959)
    Springer
    Planta 53 (1959), S. 212-218 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung Die in jungen, eingetopften Tomatenpflanzen vorliegende Verteilung der Kationen in der Blattasche zeigt ein Maximum an Kalium in den jüngsten und ein Minimum in den ältesten Blättern. Für das Calcium liegen die Verhältnisse umgekehrt. Eine Besprühung der ganzen Pflanze mit einer Lösung von IES (10−5}, 10−6) hat eine epinastische Bewegung der Blätter zur Folge. Hierbei haben die ältesten Folgeblätter eine Frischgewichtszunahme von 18% zu verzeichnen, der nur eine geringfügige Trockengewichtszunahme gegenübersteht (vermehrter Wassereinstrom). Nach der IES-Besprühung erfolgt bei den ältesten Blättern eine starke Kalizunahme, während gleichzeitig in den jüngeren Blättern eine leichte Abhahme des Kaliums in der Aschenzusammensetzung zu erkennen ist. Die dabei zu beobachtende Umkehrung der Kaliwanderung in basipetaler Richtung zu den ältesten Blättern hin läßt eine von der Indolylessigsäure ausgelöste Acceptorwirkung gegenüber dem Kalium vermuten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01947676
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