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  • Ultrastructure  (11)
  • Springer  (11)
  • Geological Society of America (GSA)
  • 1980-1984
  • 1970-1974  (11)
  • 1972  (11)
Sammlung
Verlag/Herausgeber
  • Springer  (11)
  • Geological Society of America (GSA)
Erscheinungszeitraum
  • 1980-1984
  • 1970-1974  (11)
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 126 (1972), S. 320-334 
    ISSN: 1432-0878
    Schlagwort(e): Glandulae submaxillares ; Mammals ; Acinar cell granules ; Ultrastructure ; Histochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 126 (1972), S. 446-453 
    ISSN: 1432-0878
    Schlagwort(e): Eye ; Manduca sexta ; Ommatidia ; Retinula ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    ISSN: 1432-0878
    Schlagwort(e): Ultimobranchial glands ; Urodeles ; Cell types ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 127 (1972), S. 1-8 
    ISSN: 1432-0878
    Schlagwort(e): Parathyroids ; Anurans ; Crystals ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Cytoplasmic and nuclear crystalline inclusions are described in parathyroid secretory cells of adult frogs (Rana temporaria L.) and their possible significance is discussed.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 129 (1972), S. 386-394 
    ISSN: 1432-0878
    Schlagwort(e): Acrorrhagi ; Actinia equina ; separation of the ectoderm ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Beschreibung / Inhaltsverzeichnis: 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.
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 132 (1972), S. 131-146 
    ISSN: 1432-0878
    Schlagwort(e): Nervous tissue ; Tardigrada ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Beschreibung / Inhaltsverzeichnis: 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.
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 133 (1972), S. 35-46 
    ISSN: 1432-0878
    Schlagwort(e): Ultrastructure ; Fowl ; Liver
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 134 (1972), S. 255-271 
    ISSN: 1432-0878
    Schlagwort(e): Hepatopancreas ; Limulus ; Gap junctions ; Calcium spherules ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 126 (1972), S. 335-347 
    ISSN: 1432-0878
    Schlagwort(e): Glandulae submaxillares ; Mammals ; Duct cell granules ; Ultrastructure ; Histochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 126 (1972), S. 437-445 
    ISSN: 1432-0878
    Schlagwort(e): Eye ; Sarcophaga bullata ; Ommatidia ; Lamina ganglionaris ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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