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  • 1955-1959  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Spectral Sensitivity of an Echinoid (1957)
    [s.l.] : Nature Publishing Group
    Nature 179 (1957), S. 924-924 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The sensitivity of isolated pieces of test-bearing integument, spines and radial structures was determined in the region of the spectrum between 400 and 600 m(x by means of interference niters transmitting wave-bands 8-11 mjjt. wide and a lamp of known colour temperature, placed at a finite ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/179924a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reactions to Shading in the Sea Urchin, Psammechinus miliaris (Gmelin) (1956)
    [s.l.] : Nature Publishing Group
    Nature 178 (1956), S. 1300-1300 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] By using calibrated neutral filters it was found that the interval between instantaneous shading and the appearance of a clearly visible response varied inversely with the intensity of illumination and the degree of intensity change. In successive experiments with an illumination of more than 100 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1781300a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Acetylcholine and Eserine on the Spawning of Hydractinia echinata (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 1151-1151 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] As previously reported3'4, spawning is induced by a suitable periodicity of lighting, darkness conditioning the response which is triggered by light. When isolated gonophores are subjected to sea water containing either acetylcholine (concentration; 5 x 10~4) or eserine (concentration; 10~4) during ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1841151a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Spawning in coelenterates (1959)
    Springer
    Cellular and molecular life sciences 15 (1959), S. 11-12 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé La ponte deH. echinata est influencée par la lumière, qui est nécessaire pendant deux périodes: d'abord pendant la gamétogenèse et plus tard (après une période d'obscurité) pour déclencher la maturation finale et la ponte. L'effet de la lumière pendant la deuxième période ne suit pas la règle de Bunsen-Roscoe.H. echinata est comparée, en ce qui concerne l'action des divers facteurs, avecSpirocodon etH. epiconcha. La signification des ions de Ca et Mg est examinée.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02157070
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Light sensitive nerve in an echinoid (1959)
    Springer
    Cellular and molecular life sciences 15 (1959), S. 13-14 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Grâce à une méthode perfectionnée de stimulation, nous avons pu démontrer l'existence, prévue par des indications antérieures, du nerf photosensible chez l'oursinDiadema. Nous avons enregistré des mouvements piquants d'après des observations au cours desquelles le nerf radial, partiellement isolé, était stimulé par des diminutions de l'intensité lumineuse, qui affectaient des parties de 10–100 µ de diamètre.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02157072
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    Paper (German National Licenses)
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