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  • Articles  (59)
  • Electron microscopy  (59)
  • 1970-1974  (59)
  • 1935-1939
  • Biology  (59)
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  • Articles  (59)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 132 (1972), S. 365-380 
    ISSN: 1432-0878
    Keywords: Golgi apparatus ; Membranes ; Cross-bridges ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Electron opaque cross-bridge structures span the inter- and intracisternal spaces and provide membrane-to-membrane connections between adjacent cisternae of dictyosomes of pollen tubes ofClivia andLilium. Additionally, the classic intercisternal rods, characteristic of intercisternal regions near the maturing face of dictyosomes, are connected with the adjacent membranes through similar cross-bridge elements. We suggest that these structural links are responsible for maintaining the flattened appearance of the central parts of Golgi apparatus cisternac as well as for the coherence of cisternae within the stack. Observations on other plant (e.g. microsporocytes ofCanna) and animal cells (e.g. rodent liver and hepatoma cells, newt spermatocytes) show that such an array of membrane cross-links is a universal feature of Golgi apparatus architecture. The cross-bridges appear as part of the complex “zone of exclusion” which surrounds dictyosomes, entire Golgi apparatus and Golgi apparatus equivalents in a variety of cell types.
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  • 2
    ISSN: 1432-0878
    Keywords: Urinary bladder ; Frog ; Water permeability and Ultrastructure ; Hyperosmolarity ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Resumé Certaines informations récentes (voir introduction) nous ont conduits à reconsidérer la possibilité que l'action de l'hormone antidiurétique sur les tissus épithéliaux puisse s'exercer au niveau des jonctions intercellulaires. Une étude comparative des cinétiques d'apparition des altérations ultrastructurales et des variations de perméabilité à l'eau a permis d'établir que les décollements de la “tight junction” provoqués par l'hyperosmolarité muqueuse apparaissent avant tout accroissement significatif du flux net d'eau et ne peuvent donc pas en être la conséquence. L'examen à haute résolution, par cryodécapage, de la structure de la “tight junction” montre l'apparition dans ces conditions de plages plus ou moins circulaires où la membrane présente un aspect lisse et apparemment distendu et où la structure typique de la “tight junction” a disparu. Ces modifications rétrocèdent après stimulation hormonale et ceci conduit à penser qu'elles ne sont pas impliquées dans la réspone hydrosomotique physiologique.
    Notes: Summary The role of the tight junction in the hydrosmotic response of the frog urinary bladder has been analysed by comparative kinetic studies and freeze etching examination. The comparison of the time course of the variations in transepithelial water net flux and of the alterations of tight junction ultrastructure in bladders exposed to mucosal hyperosmolar solutions shows that blisters are present in the tight junction before any increase in transepithelial water net flux. This indicates that the two phenomena are dissociated. In the same experimental conditions, freeze etching examination shows the presence in the tight junction of large areas of smooth and apparently stretched membrane where the typical network structure has disappeared. These alterations are reduced by further treatment with oxytocin and are probably not involved in the physiological hydrosomotic response.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 153 (1974), S. 449-464 
    ISSN: 1432-0878
    Keywords: Juxtaglomerular apparatus ; Bufo bufo ; Macula densa ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of the juxtaglomerular apparatus in the toad, Bufo bufo was investigated.—It is suggested that the granules in the media cells of the afferent arteriole are formed from the Golgi apparatus. Many granules have a content of lamellar material. The media cells do not show the ultrastructural features of active secretory cells. In the media cells, the myofilaments are situated near the vascular lumen. The other cell organelles, including the granules, are preferentially located at the opposite pole of the cell in the neighbourhood of the macula densa cells and the adventitial nerve fibres. In these regions the media cells show many pinocytotic vesicles. The nerve fibres innervating the juxtaglomerular cells are non-myelinated and their varicosities contain dense core vesicles. The basement membranes of media cells and adjacent macula densa cells occasionally fuse, which may indicate a functional relationship between these cells.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 139 (1973), S. 397-403 
    ISSN: 1432-0878
    Keywords: Visual system ; Musca domestica ; Monopolar cells ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Nur drei von den fünf Monopolarzelltypen L1, L2, L3, die in jeder Cartridge der Lamina vorhanden sind, sind synaptisch mit den sechs Rezeptorendigungen (R1–R6) verbunden. Entsprechend der Verteilung ihrer Dendriten sind zwei von den drei Neuronen (L1 und L2) zur gesamten Länge der Endigungen verbunden, während das dritte Neuron (L3) Verbindungen nur in dem äußeren Zweidrittel der Lamina hat. Obwohl diese drei Zellen als Neurone 2. Ordnung des Neurosuperpositionsauges wirken könnten, deutet ihre anatomische Organisation auf funktionelle Unterschiede hin.
    Notes: Summary Only three of the five types of monopolar cells which are present in each cartridge of the lamina have synaptic connections with receptor endings (R1–R6). Due to the distribution of their dendrites two of these (L1 and L2) contact the whole length of the six receptor endings of their cartridge whereas the third type (L3) contacts only their outer 2/3rds. Although these three cells may function as the second order neurons of the neurosuperposition eye, their anatomical relationship imply functional differences between them.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 130 (1972), S. 362-377 
    ISSN: 1432-0878
    Keywords: Lorenzinian ampullae ; Polyodon spathula ; Sensory epithelium ; Synapses ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Light and electron microscopic observations on the ampullary organs of Polyodon spathula (Chondrostei, Osteichthyes) reveal a sensory epithelium similar to that found in the Lorenzinian ampulla, an electroreceptor found in marine Elasmobranchs. The sensory cells have a very small luminal part provided with a cilium. They are innervated by many nerve endings. Each nerve fibre apparently makes synaptic contact with several sensory cells. The synaptic structure in the sensory cell is composed of a flat sheet, the outermost part of which is surrounded by 3 or 4 annuli of densely staining material. The sheet extends into a protrusion of the sensory cell, and there is a corresponding invagination in the nerve terminal. The conclusion that these organs are electroreceptors, is supported by the finding that the fish responds to the introduction of an iron tube in the aquarium, whereas a wooden rod introduced in the same way causes no response.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 142 (1973), S. 465-477 
    ISSN: 1432-0878
    Keywords: Rabbit thymus ; Ketosteroids ; Granulated cells ; Histochemistry ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Topochemisch konnten im Kaninchenthymus Ketosteroide nachgewiesen werden, für deren Vorhandensein die chemische Analyse von Thymuslipidextrakten Hinweise ergeben hatte. Die Darstellung der Ketosteroide erfolgte mit der NAHD-Reaktion (Camber, 1949). Diese Befunde dürften als spezifisch gelten, da eine Verfälschung durch freie Gewebsaldehyde, Plasmalogene (Gomori, 1952) und Corticosteroide (Khanolkar et al., 1958) ausgeschlossen wurde. Mit Hilfe der Camber-Methode konnten Granula bestimmter Zellen des Kaninchenthymus selektiv dargestellt werden, die auf Grund morphologischer Kriterien in zwei Gruppen unterteilt wurden. Die Zellen liegen im gesamten Thymusparenchym sowie im Bindegewebe der Septen und der sogenannten „Kapsel“. Prädilektionsorte stellen die Umgebung der Hassallschen Körperchen, die Mark-Rinden-Grenze, der intra- und perivasale Raum sowie die subkapsuläre Zone dar. Beide Zellgruppen sind Sudan III-, PAS- und Eosin-positiv, besitzen eine ausgeprägte gelbgrüne Eigenfluoreszenz und können differentialdiagnostisch gegen Mastzellen abgegrenzt werden. Elektronenmikroskopisch zeigen beide Zellgruppen zahlreiche Übereinstimmungen mit Reifestadien eosinophiler Knochenmarkszellen.
    Notes: Summary Ketosteroids were demonstrated topochemically in the rabbit thymus following indications given by chemical analysis of thymus lipid extracts. They were revealed by means of the NAHD-reaction (Camber, 1949). The results are thought to be specific, because adulteration by free tissue aldehydes, plasmalogens (Gomori, 1952) and corticosteroids (Khanolkar et al., 1958) can be excluded. The Camber-method selectively reveals the presence of two groups of morphologically differentiable granules in specific rabbit thymus cells which are distributed throughout the entire thymic parenchyme as well as in the connective tissue of the septa and the in so-called “capsule”. They are mainly seen in the vicinity of Hassall's bodies, in the zone between medulla and cortex, the intra- and perivascular space and in the subcapsular space. Both cell groups are Sudan III-, PAS- and eosin-positive, show intensive yellow-green primary fluorescence and can be distinguished from mast cells by differential diagnosis. Electron microscopy reveals that both cell groups show many similarities with the maturation phase of bone marrow eosinophils.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 131 (1972), S. 141-148 
    ISSN: 1432-0878
    Keywords: Giant axon ; Nerve cord ; Electron microscopy ; Polychaeta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultrastructural observations of the giant axon of Myxicola infundibulum reveal that the axoplasm contains neurofilaments, a few neurotubules and mitochondria. Finger-like projections issuing from the glial cells of the sheath encircle the giant axon at various angles. The space between the axolemma and sheath is 125 Å. Branches of the giant axon are also surrounded by a glial sheath as they course through the neuropil. Some branches of the giant axon seem to fuse with certain neurons, creating a syncytial arrangement between the giant axon and these neurons. Many small nerve fibers course longitudinally in the neuropil of the nerve cord. Most of these axons are separated from each other by a space of 200 Å without intervening glial processes. Synapses in the neuropil have both clear 600 Å vesicles and larger dense core vesicles suggesting chemical transmission. Some, but not all, of the synaptic areas show thickened membranes and dense material in the synaptic cleft.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 150 (1974), S. 147-159 
    ISSN: 1432-0878
    Keywords: Urinary bladder ; Autonomic innervation ; SIF cells ; Fluorescence ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Fluorescence and electron microscopy have been used to study the distribution of noradrenergic nerves in the smooth muscle of the cat urinary bladder. Using the former technique, relatively few fluorescent noradrenergic nerves were observed in the body and fundus, while a rich plexus occurred adjacent to muscle cells of the bladder neck. The trigone could not be distinguished neuromorphologically from detrusor muscle in this region. Electron microscopy showed that the majority of noradrenergic terminals in the body and fundus were associated with presumptive cholinergic axons, while in the bladder neck noradrenergic terminals formed typical neuroeffector relationships with individual smooth muscle cells. Numerous ganglia occurred both in the adventitia and among the smooth muscle bundles, particularly in the bladder neck. The majority of the nerve cell bodies were non-fluorescent, although many contained bright orange autofluorescent granules, believed to be lysosomes. A small minority of ganglion cells were associated with fluorescent noradrenergic nerve terminals, thereby providing structural evidence for limited intraganglionic inhibition. In addition, occasional groups of small intensely fluorescent (SIF) cells were observed in some intramural ganglia and these were subsequently identified in the electron microscope. The possibility that these cells may provide a second inhibitory influence on bladder activity was considered.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 131 (1972), S. 417-427 
    ISSN: 1432-0878
    Keywords: Lymphatic vessels ; Lung ; Centrioles ; Filaments ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An electron microscopic study of the pulmonary lymphatic collecting channels and their valves in the rabbit revealed that the endothelial cells generally contain two centrioles which are almost invariably associated with one to several striated bundles of filaments. The structure of the centrioles corresponds well with that in other cell types. The filaments however were present only in endothelial cells and not in the perilymphatic connective tissue cells. The bundles consist of 2 to 6 filaments of about 40 Å diamenter and show a cross banding with a periodicity of 600 to 900 Å. They are attached at both ends or in the middle of the centriole. Their function is unknown, but they might be vestigial rootlets of rudimentary cilia of lymphatic endothelial cells.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 138 (1973), S. 171-186 
    ISSN: 1432-0878
    Keywords: Tooth germs ; Organ culture ; Differentiation ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Tooth germs from foetal rats of 17 days post-insemination were maintained in vitro for 12 days. Odontoblasts and ameloblasts differentiated and secreted their respective matrices in which mineralization occurred. The ultrastructure of the cells was qualitatively similar to that observed in normal development. Odontoblasts contained more lysosome-like bodies and were found to degenerate in some sites. Mantle dentine was formed but few von Korff fibres were observed. Calcospherites were rarely seen and the mineralizing front of dentine was predominantly linear, associated with numerous small early foci of mineral formation. Enamel showed prism formation associated with the Tomes' process of the ameloblast but some local disturbances in the pattern of enamel formation were observed.
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