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  • Integument  (2)
  • DAB-cytochemistry  (1)
  • Diplopoda  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The impact of lead on the assimilation efficiency of laboratory-held Diplopoda (Arthropoda) preconditioned in different environmental situations (1992)
    Springer
    Oecologia 90 (1992), S. 113-119 
    Details
    ISSN: 1432-1939
    Keywords: Diplopoda ; Heavy metals ; Lead ; Assimilation efficiency ; Precondition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In five diplopod species from three families collected from locations with different soil metal contents, the following parameters were examined: the litter mass (and energy) ingested per day, the mass (and energy) assimilation rates, and the litter mass (and energy) assimilated per day, when the diplopods were fed (1) uncontaminated and (2) artificially lead-enriched leaf litter. These parameters were compared between species and between animals from different sites. The mass and energy assimilation efficiencies depend on (1) the size of the species and (2) the collection site of the animals. Relative mass (and in three of the species examined also energy) assimilation was highest in those animals collected from the less contaminated sites. With artificial diets, specimens from a site with soil contaminated by heavy metals showed greater assimilation of both mass and energy than originally unaffected specimens. One species (Glomeris conspersa) was able to compensate for the low assimilation rate by increased consumption, and thus guarantee a sufficient energy supply. One of the other species (Polydesmus denticulatus), however, did not show this compensation. Animals of this species from less contaminated sites showed a very low absolute energy assimilation rate and high mortality under lead treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317816
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  • 2
    Electronic Resource
    Electronic Resource
    Über die Regeneration des Integumentes aus Zellen im Ventralnervenstrang von Phascolion strombi (Montagu) (Sipunculida) (1970)
    Springer
    Cell & tissue research 110 (1970), S. 258-267 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335530
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  • 3
    Electronic Resource
    Electronic Resource
    Marginal plates in hepatic peroxisomes of Ichthyophis glutinosus (Amphibia: Gymnophiona) (1984)
    Springer
    Cell & tissue research 238 (1984), S. 413-416 
    Details
    ISSN: 1432-0878
    Keywords: Peroxisomes ; DAB-cytochemistry ; Electron microscopy ; Liver, amphibian ; Gymnophiona ; Ichthyophis glutinosus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of hepatic peroxisomes was investigated in Ichthyophis glutinosus (Amphibia: Gymnophiona), employing perfusion fixation and the diaminobenzidine (DAB) technique for the visualization of catalase. The majority of peroxisomes is circular or rod-shaped, although elongated particles occasionally occur. They contain a finely granular matrix, lightly stained after the DAB procedure. Their mean diameter is approximately 0.25 μm. Serial sections reveal that the circular and rod-shaped peroxisomal profiles are cross and oblique sections of highly tortuous, tubular organelles exceeding 2 μm in length. In addition to tubular profiles, elongated, rectangular particles, as well as straight dumbbell-shaped organelles with distinct marginal plates are observed. They range from 900 to 1650 nm in length (mean = 1200 nm). In the flattened, thin central portion of the dumbbell-shaped particle, the peroxisomal membranes form a cisterna enclosing one or two uniformly thick marginal plates, which display a definite substructure with a periodicity of 10 nm. These findings indicate that peroxisomes in the liver of Ichthyophis exhibit a complex organization. It is suggested that the organelles undergo a specific differentiation process, morphologically characterized by the formation of enlarged segments of unusual shape.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217316
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  • 4
    Electronic Resource
    Electronic Resource
    Über den Aufbau des Integumentes der Priapuliden und der Sipunculiden [Priapulus caudatus Lamarck, Phascolion strombi (Montagu)] (1970)
    Springer
    Cell & tissue research 105 (1970), S. 55-64 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00340564
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