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  • Articles  (11)
  • Ultrastructure  (11)
  • 1980-1984
  • 1970-1974  (11)
  • 1972  (11)
  • 1
    Electronic Resource
    Electronic Resource
    I. Ultrastructure of acinar cell granules in mammalian submaxillary glands (1972)
    Springer
    Cell & tissue research 126 (1972), S. 320-334 
    Details
    ISSN: 1432-0878
    Keywords: Glandulae submaxillares ; Mammals ; Acinar cell granules ; Ultrastructure ; Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Granules in acinar cells show considerable variations in size, shape, electron-density and molecular organisation of secretory material. Discrete organelles with an electron-dense homogenous matrix are seen in the guinea-pig and to some extent in the male hamster. Similar organelles with moderate electron-density are seen in the cat and dog. Acinar cells of the cat, hamster, guinea-pig and to a lesser extent the rat, contain discrete, pale granules and also confluent organelles arising from two to three of the pale particles. Composite, electron-pale secretory units are observed in the dog and rabbit. No correlation could be elicited between the histochemical reactivity of the acinar cells and the content of the secretory enzymes. The relationship between the histochemical reactivity and ultrastructural appearance of acinar cell granules and the organelles containing kallikrein, trypsin-like proteases and amylase seems much more important and functionally relevant. Morphological aspects of the intracellular transport and secretion of granules are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306847
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  • 2
    Electronic Resource
    Electronic Resource
    Scanning electron microscopy of the insect compound eye (1972)
    Springer
    Cell & tissue research 126 (1972), S. 446-453 
    Details
    ISSN: 1432-0878
    Keywords: Eye ; Manduca sexta ; Ommatidia ; Retinula ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The superposition eye of the sphingid moth, Manduca sexta was explored by means of the scanning electron microscope (SEM). Specifically examined were the corneal nipple array, corneal lens, crystalline cones and tracts, photoreceptor cells and their axons. Descriptions of the external ultrastructure of the components were correlated, where possible with previously published accounts of internal ultrastructure as obtained from TEM studies. A key finding was the demonstration of the axial rotation of the eccentrically situated retinular cell, its externally noted prominence and the arrangement of the other photoreceptor cells composing the retinula. Because of the interest in superposition eye theory, the functional significance of various preretinular optic components was reviewed where it specifically related to Manduca.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306905
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  • 3
    Electronic Resource
    Electronic Resource
    Ultimobranchial gland ultrastructure of larval axolotls, Ambystoma mexicanum shaw, with some observations on the newt, Pleurodeles waltlii Micahelles (1972)
    Springer
    Cell & tissue research 134 (1972), S. 183-192 
    Details
    ISSN: 1432-0878
    Keywords: Ultimobranchial glands ; Urodeles ; Cell types ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of the ultimobranchial (UB) glands of two common laboratory urodeles, viz., larval axolotls, Ambystoma mexicanum Shaw and adult Pleurodeles waltlii Micahelles, is described and compared in what is believed to be the first ultrastructural report on urodele UB glands. The axolotl UB gland shows a wide variety of form, being represented by an elongated diffuse series of follicles and sometimes by one or two large discrete terminal follicular bodies. In these axolotl UB glands up to four cell categories are distinguishable including a tonofilamentous cell and a secretory cell that is possibly homologous with calcitonin-producing C cells of anurans or other vertebrates. These two cell categories are also found in the Pleurodeles gland. The possible significance of the various cells is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307152
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  • 4
    Electronic Resource
    Electronic Resource
    Crystalline bodies in parathyroid gland cells ofRana temporaria L. (1972)
    Springer
    Cell & tissue research 127 (1972), S. 1-8 
    Details
    ISSN: 1432-0878
    Keywords: Parathyroids ; Anurans ; Crystals ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Cytoplasmic and nuclear crystalline inclusions are described in parathyroid secretory cells of adult frogs (Rana temporaria L.) and their possible significance is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00582756
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  • 5
    Electronic Resource
    Electronic Resource
    Adaptation morphologique de l'acrorrhage chez Actinia equina L. (1972)
    Springer
    Cell & tissue research 129 (1972), S. 386-394 
    Details
    ISSN: 1432-0878
    Keywords: Acrorrhagi ; Actinia equina ; separation of the ectoderm ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé L'analyse ultra-structurale de l'acrorrhage d'Actinia equina L. a permis de montrer une adaptation histologique au décollement de l'ectoderme lors de la réponse de l'actinie à une agression. La zone basale et digitée des cellules ectodermiques est très vacuolisée. La turgescence de l'acrorrhage provoque une extension de la mésoglée; on observe un écartement des bases cellulaires et la rupture des vésicules facilite la séparation de l'ectoderme et de la mésoglée. Celle-ci a lieu après ancrage des nématocystes atriches dans les tissus de l'agresseur, et retrait de l'Actinie.
    Notes: Summary The ultrastructural analysis of the acrorhagi of Actinia equina reveals histological adaptations to the specific detachment of this brightly colored strip of ectoderm in case of being attached. The basal zone of the ectoderm cells is highly vacuolated. The turgidity of the acrorhagous provokes an extension of the mesoglea. The separation of the ectoderm is facilitated by rupture of the vacuoles and the specific arrangement of the filament containing branched bases of the cells. When the ectoderm, which contains numerous nematocysts, is fixed in the tissue of a agressor, this one detaches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307295
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  • 6
    Electronic Resource
    Electronic Resource
    Die Struktur des Nervengewebes von Macrobiotus hufelandi C.A.S. Schultze (Tardigrada) (1972)
    Springer
    Cell & tissue research 132 (1972), S. 131-146 
    Details
    ISSN: 1432-0878
    Keywords: Nervous tissue ; Tardigrada ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Das Nervengewebe von Macrobiotus hufelandi zeichnet sich durch stark verzweigte pseudunipolare Nervenzellen und relativ wenige Gliazellen aus. Die Neurone besitzen rauhes ER, freie Ribosomen, zahlreiche Mitochondrien, einen wenig ausgeprägten Golgi-Apparat und einen elektronenlichten Kern. In ihren Axonen finden sich Vesikel und Einschlüsse unterschiedlicher Größe und Zusammensetzung. Die Gliazellen verzweigen sich stark und besitzen glattes ER, viele freie Ribosomen und einen elektronendichten Kern. Ganglien und Nerven werden nur durch eine dünne Neurallamelle vom extraganglionären Raum getrennt. Die morphologische Ausbildung des Nervengewebes wird im Hinblick auf die extreme Lebensweise der Tardigraden diskutiert.
    Notes: Summary The typical elements of the nervous tissue of Macrobiotus hufelandi are strongly ramified pseudunipolar neurons and a small amount of glial cells. In the perikarya of neurons there are rough ER, free ribosomes, many mitochondria, a poor Golgi-apparatus, and an electron-light nucleus. Nerve fibers contain masses of vesicles and inclusions of different size and composition. The ramifying glial cells have smooth ER, many free ribosomes, and an electron-dense nucleus. Ganglia and nerves are separated from the extraganglionic cavity by a thin acellular sheath (neural lamella). The organization of the nervous tissue is discussed with regard to the extreme conditions of environment of the tardigrades.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310301
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  • 7
    Electronic Resource
    Electronic Resource
    The ultrastructure of the liver parenchyma of the immature fowl (Gallus domesticus) (1972)
    Springer
    Cell & tissue research 133 (1972), S. 35-46 
    Details
    ISSN: 1432-0878
    Keywords: Ultrastructure ; Fowl ; Liver
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the liver parenchymal cell from immature pullets and from immature and young mature cockerels has been studied. The results demonstrated that the fowl's hepatocyte is structurally very similar to that of other birds and, in spite of certain morphological differences between the livers of birds and mammals, is also very similar in structure to the liver cell of mammals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307066
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  • 8
    Electronic Resource
    Electronic Resource
    Ultrastructure of the hepatopancreas and associated tissues of the chelicerate arthropod, Limulus polyphemus (1972)
    Springer
    Cell & tissue research 134 (1972), S. 255-271 
    Details
    ISSN: 1432-0878
    Keywords: Hepatopancreas ; Limulus ; Gap junctions ; Calcium spherules ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the hepatopancreas and associated tissues of Limulus is described. All hepatopancreatic tubules contain L- and D-cells. L-cells exhibit apical pinocytosis and contain many different types of inclusions, including lipid containing calcium spherules of unique structure. They also produce a complex secretory product released by apocrine secretion. D-cells contain much rough endoplasmic reticulum, and show other evidence of active protein synthesis. They produce a single type of secretory granule released by merocrine activity. The appearance of L- and D-cells in tubules of various sizes and in fed and starved animals is described. Both cell types may produce digestive enzymes and absorb and transport nutrients to the hemolymph, but neither serves as a major storage site. Storage is an important function of the intertubular R-cells. The appearance of R-cells in fed and starved animals is described. A previously undescribed hemocyte is reported, as are apparent gap junctions between L- and R-cells. A structural and functional comparison of these glands with those of other arthropods is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307157
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  • 9
    Electronic Resource
    Electronic Resource
    II. Ultrastructure of duct cell granules in mammalian submaxillary glands (1972)
    Springer
    Cell & tissue research 126 (1972), S. 335-347 
    Details
    ISSN: 1432-0878
    Keywords: Glandulae submaxillares ; Mammals ; Duct cell granules ; Ultrastructure ; Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Discrete, PAS-positive granules of relatively uniform electron-density and size characterise the intercalated duct cells of mammalian submaxillary glands. Smaller, electron-dense organelles are seen in the cells at the junction of the intercalary-striated duct region in the guinea-pig. The large granules of variable electron-density which are observed in the proximal, modified intercalary cells in the rabbit closely resemble the granules in the acinar cells of the guinea-pig. Several populations of granules differing in size are found in the striated granular tubules of the rat and hamster; the organelles in the rat show two grades of electron-density whereas those in the hamster are uniformly dense. Numerous small granules with compactly arranged intragranular material occupy the apical part of the striated ducts of the cat, dog and rabbit. The chemical composition of each population of duct cell granules is unknown. The question whether granules containing kallikrein, trypsin-like enzymes and amylase are stored in the duct cells is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306848
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  • 10
    Electronic Resource
    Electronic Resource
    Scanning electron microscopy of the insect compound eye (1972)
    Springer
    Cell & tissue research 126 (1972), S. 437-445 
    Details
    ISSN: 1432-0878
    Keywords: Eye ; Sarcophaga bullata ; Ommatidia ; Lamina ganglionaris ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary External and internal surfaces of the compound eye of the flesh fly, Sarcophaga bullata, were examined with a scanning electron microscope. A low patterned corneal nippleridge array and sparse setiform interfacetal hairs were observed on the corneal lens surface. Particular cleavage planes revealed outlines of the Semper Cells, their nuclei and distal terminations of photoreceptor cells. The latter, with their axonal processes, were visualized and described. These axons were noted traversing the external chiasma and entering the lamina ganglionaris where suggestions of synaptic contact were pointed out. The present descriptions were correlated with those taken from literature of the transmission electron microscope.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306904
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