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  • 1970-1974  (7)
  • 1970  (7)
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  • 1970-1974  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Zoomorphology 66 (1970), S. 310-322 
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Comparative finestructural studies on the integument of 18 polychaetes belonging to 14 families were conducted. Main differences are to be found in the organisation of the cytoplasm (homogenous or vacuolated) and the occurrence of layers of fibers between the apical microvilli.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 107 (1970), S. 234-239 
    ISSN: 1432-0878
    Keywords: Stomochord ; Chorda dorsalis ; Enteropneusta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Das Stomochord von Harrimania kupfferi und Ptychodera flava, eine Ausbuchtung des Darmkanals der Enteropneusten, welche in das Präsoma hineinragt, besteht aus zwei Zelltypen: a) Epithelzellen, die durch Desmosomen verbunden sind und große Vakuolen besitzen; ihr distaler Zellsaum ist mit Mikrovilli und Zilien ausgestattet. b) Schleimzellen. An der Basis des Epithels kommen zahlreiche Nervenfasern vor, die Granula (Durchmesser etwa 1,500 Å) enthalten. Das Stomochord wird von einer Basallamina und Bindegewebsfasern umschlossen. Die Frage der Homologie des Stomochords mit der Chorda dorsalis wird diskutiert.
    Notes: Summary The stomochord of Harrimania kupfferi and Ptychodera flava. a tubular structure which extends from the oral cavity into the presoma, consists of two cell types: a) epithelial cells interconnected by desmosomes, which bear at their apical pole a brush-border and cilia. The largest part of these cells is occupied by a voluminous vacuole; b) mucus cells. In addition, at the base of the epithelium numerous nerve fibres occur, which are characterized by electron dense granules of about 1,500 Å diameter. The whole stomochord is surrounded by a basement lamina and connective tissue fibres. The question of homology between stomochord and notochord is discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Parasitology research 35 (1970), S. 67-75 
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Feinstruktur der Körperwand der Sporozyste und des jungen Distomum von Leucochloridium paradoxum wurde mit dem Elektronenmikroskop untersucht. Das Sporozystenintegument ist durch lange, verzweigte Mikrovilli gekennzeichnet. Die Epidermis-Perikarya, die sehr viel Glykogen und Lipid enthalten, sind versenkt. Dem Distomumintegument lagert eine Schicht faserigen und globulären Materials auf. Im Zytoplasma finden sich hantelförmige Sekretionsgranula und kristalloide Stacheln. Auch das Integument der jungen Distoma ist versenkt.
    Notes: Summary The fine structure of the body wall of the sporocyst and young distomum of Leucochloridium paradoxum was examined with the electron microscope. The integument of the sporocyst which lacks the intestinal tract, is characterised by tall and branched microvilli as well as by perikarya which lie below the basal lamina. The latter are particularly rich in glycogen and lipid inclusions. The integument of the young distomum is surrounded by a thick layer of fibrous and globular material. The cytoplasm contains elongated secretory granules and crystalloid spines. The perikarya are again situated below the basal lamina.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 110 (1970), S. 258-267 
    ISSN: 1432-0878
    Keywords: Sipunculids ; Regeneration ; Integument
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Zellen des Regenerationsstranges im Bauchmark von Phascolion strombi sind in erster Linie durch elektronendichte Einschlüsse gekennzeichnet, deren Durchmesser etwa 5000 Å betragen. Bei Introvertamputation wandern diese Zellen nach vorn und bilden eine kolbenförmige Gewebemasse. Die rundlichen Einschlüsse lösen sich auf, werden zu Fasern umgebildet und aus den Zellen in das Interstitium geschleust. Diese Wanderstadien der Regenerationszellen sind durch sehr viele Glykogenrosetten und Lipideinschlüsse gekennzeichnet. Im weiteren Verlauf entstehen zwischen den distalen Zellen des Regenerates Desmosomen. Über den mit Mikrovilli versehenen Zellapices bildet sich die Kutikula, die offenbar den Sekreteinschlüssen der Regenerationszellen entstammt. Im jungen Epithel fehlen die für Regenerationsstrang und Wanderstadien typischen Einschlüsse, sein Zytoplasma ist reich an granulärem endoplasmatischen Retikulum. Die neue Muskulatur entsteht aus Amöbozyten.
    Notes: Summary The cells of the regeneration string in the ventral nerve cord of Phascolion strombi are in particular characterised by electron dense granules of 5000 Å in diameter. Following amputation of the introvert these cells migrate anteriorly and form a clublike mass of tissue. At this stage they are strikingly rich in glycogen and lipid. The globular inclusions dissolve and transform into fibers which are extruded from the cell into the interstitial space. At later phases of development desmosomes form between the distal cells of the regenerative tissue. On top of the microvilli bearing apical cell poles a cuticle develops, obviously arising from the secretion granules of the regeneration cells. The new-formed epithelium lacks inclusion bodies which are typical for the regeneration string and the migrating cells, instead its cytoplasm is rich in rough E. R. profiles. The musculature is built up by amebocytes.
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  • 5
    ISSN: 1432-0878
    Keywords: Priapulida ; Sipunculida ; Integument
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Epidermis von Priapulus caudatus besteht aus E. R.-reichen Zellen, deren chromatinarme Kerne apikal von zahlreichen Mitochondrien umgeben werden. Distal lagert eine dicke Kutikula, die aus feinfaserigem Material besteht. Die basale Plasmamembran ist zu einem umfangreichen Labyrinth aufgefaltet. Die Epidermis von Phascolion strombi weist nur wenig endoplasmatisches Retikulum auf. In den Zellen kommen viele Tonofilamentbündel vor. Das basale Plasmalemm ist aufgefaltet. Die Kutikula besteht aus vielen Schichten rechtwinklig gegeneinander versetzter Fibrillenlagen. Dieser ultrastrukturelle Bau einer Kutikula tritt sonst nur bei den Anneliden auf. Im Bereich der Tentakel findet sich keine Kutikula. Das Epithel ist hier mit einem Mikrovillussaum versehen und trägt an manchen Stellen Zilien.
    Notes: Summary The epidermis of Priapulus caudatus consists of cells with strikingly pale nuclei and an abundant granular endoplasmic reticulum. The apical parts of the nuclei are surrounded by dense clusters of mitochondria. The thick cuticle consists of fibrous material. The basal plasmalemma exhibits up-foldings that build up a labyrinthine system of intercellular spaces. The epidermis of Phascolion strombi which is poor in endoplasmic reticulum, is characterized by many bundles of tonofilaments. The basal plasmalemma exhibits simple up-foldings. The cuticle consists of layers of fibrils, which are orientated at right angles over each other. A similar cuticle has been found in the class of Annelids. In the area of the tentacles there is no cuticle, the epithelium bears microvilli and cilia.
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  • 6
    Publication Date: 1970-01-01
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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  • 7
    Publication Date: 1970-01-01
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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