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  • 1
    Electronic Resource
    Electronic Resource
    Light-induced alterations in cell shape and pigment displacement in chromatophores of the sea urchin Centrostephanus longispinus (1977)
    Springer
    Cell & tissue research 182 (1977), S. 165-176 
    Details
    ISSN: 1432-0878
    Keywords: Chromatophores ; Light-sensitivity ; Granule motion ; Echinoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Alterations in cell shape of the light-sensitive chromatophores of Centrostephanus longispinus are described. Upon illumination a centrifugal pigment movement starts within extremely thin filopodia which radiate from the cell body. With continued pigment migration the cellular processes increase in length and diameter and give the cell an irregular stellate appearance. Pigment movement within the cellular processes is discontinuous in space and time and may occur independently in single filopodia. The motion of single granules shows characteristic features of a saltatory movement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220586
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastructural observations on changes in cell shape in chromatophores of the sea urchin Centrostephanus longispinus (1980)
    Springer
    Cell & tissue research 206 (1980), S. 21-33 
    Details
    ISSN: 1432-0878
    Keywords: Chromatophores ; Light-sensitivity ; Alteration in cell shape ; Microtubules ; Echinoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Alterations in cell shape of the light-sensitive chromatophores of the sea urchin Centrostephanus longispinus were studied by scanning- and transmission electron microscopy. Transition of the aggregated to the dispersed state is accompanied by incorporation of vesicles into the membrane of the pigment cell. During dispersion a system of microtubules originating from centriole-like structures is established throughout the stellate cell. Within restricted areas of the cell, cytoplasmic differentiation and condensation is found. The possible functional significance of the findings is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233604
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructure of the basiepithelial nerve plexus of the sea urchin, Centrostephanus longispinus (1977)
    Springer
    Cell & tissue research 175 (1977), S. 551-562 
    Details
    ISSN: 1432-0878
    Keywords: Nerve plexus ; Vesicles ; Nerve cell bodies ; Ultrastructure ; Echinoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The basiepithelial nerve plexus of the Echinoid, Centrostephanus longispinus, contains strands of nerve fibres, which measure between 0.1 and 2.0 μm in diameter. Nonciliated epithelial supporting cells do not contribute to the plexus. Within the fibres different vesicular inclusions are found. By means of serial sectioning the structure of multipolar cell bodies within the plexus could be demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222418
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    Paper (German National Licenses)
    Fulltext
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