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  • Blasensäule  (5)
  • Gastropoda  (4)
  • Electron microscopy  (3)
  • 1
    ISSN: 0009-286X
    Keywords: Blasensäule ; Viskosität ; Fermentation ; Sauerstoff-Eintrag ; Gasanteil ; Stoffübergang ; Blasengröße ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 128 (1972), S. 100-114 
    ISSN: 1432-0878
    Keywords: Connective tissue ; Gastropoda ; Globular cells ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Blasenzellen stellen ein typisches Zellelement im Bindegewebe der Gastropoden dar. Licht- und elektronenmikroskopische Untersuchungen an Cepaea nemoralis haben gezeigt, daß der größte Teil einer Blasenzelle mit einer veränderlichen Glykogenmenge angefüllt ist. Diese zentrale Glykogenansammlung verdrängt das Zytoplasma mit seinen Organellen auf den peripheren Bereich der Zelle einschließlich der Zellausläufer und einen schmalen Saum um den Zellkern. Das wichtigste Identifizierungs-merkmal der Blasenzelle ist eine sehr spezialisierte — hier als Spaltenapparat bezeichnete — Oberflächendifferenzierung. Die Auswertung von Serienschnitten hat gezeigt, daß diese Oberflächenstruktur durch eine zum Teil verzweigte Invagination des extrazellulären Raumes gebildet wird, die wiederum von der Blasenzelle durch eine mäanderförmig unterbrochene Platte abgedeckt ist. Zwischen dem Spaltenapparat der Blasenzellen und dem Reusenapparat der Podozyten der Niere scheint eine Ähnlichkeit zu bestehen.
    Notes: Summary The globular cells are typical elements of the connective tissue of Gastropods. Light- and electronmicroscopic investigations of Cepaea nemoralis have shown, that these cells are filled with variable contents of glycogen, accumulated in the centre of the cell. This crowds the cytoplasm and the cell organelles into the peripheral area, including the cell processes and a narrow band surrounding the nucleus. The typical element of the globular cell is a special differentiation of the cell surface, the so-called “Spaltenapparat”. The three-dimensional organisation of the “Spaltenapparat” has been analysed by serial ultrathin sections. The reconstruction shows, that the “Spaltenapparat” consists of numerous branched invaginations of the extracellular space covered by very small, winding cell processes; there are tiny clefts between them. There appears to be some similarity between the “Spaltenapparat” of the globular cells and the pedicels of the podocytes of the renal glomerulus.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 130 (1972), S. 262-278 
    ISSN: 1432-0878
    Keywords: Connective tissue ; Gastropoda ; Globular cells ; Uptake of ferritin ; Endocytosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Experimentelle Untersuchungen am Schlundringbindegewebe von Cepaea nemoralis haben ergeben, daß — abgesehen von einigen Blutzellen—allein die Blasenzellen befähigt sind, injiziertes Ferritin aufzunehmen. Diese Substanz gelangt aus der Hämolymphe der Körperhöhle über das Gefäßsystem durch das Endothel der Kapillaren in die interzellulären Räume des Bindegewebes und von dort ausschließlich zu den Blasenzellen. Elektronenmikroskopisch zeigt sich, daß die Blasenzellen das Ferritin wahrscheinlich nur durch Endozytose im Bereich des Spaltenapparates aufnehmen. Das Ferritin wird nicht von der Zelle abgebaut, sondern auf engstem Raum, zum Teil in parakristalliner Anordnung, in Endosomen gespeichert. Die Fähigkeit der Blasenzellen, Fremdstoffe selektiv aufzunehmen, läßt vermuten, daß sie eine analoge Bedeutung für die Gastropoden haben wie die Pericardialzellen für Insekten oder das Retikuloendotheliale System für die Vertebraten.
    Notes: Summary Experimental investigations of the ganglionic connective tissue sheath of Cepaea nemoralis have shown, that — except for some blood cells — only the globular cells are capable for the uptake of injected Ferritin. This substance gets out of the hemolymph of the body cavity through the blood-vessels and capillaries, across the collagenous connective tissue into the cytoplasm of the globular cells. The globular cells take up the Ferritin by endocytosis, exclusively by the invagination of the „Spaltenapparat“. The Ferritin remaines accumulated in endosomes sometimes having a paracrystalline pattern. Because of their capability to incorporate and accumulate injected substances, the globular cells have been compared with the pericardial cells of insects respectively with the reticuloendothelial system of vertebrates.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 146 (1973), S. 139-146 
    ISSN: 1432-0878
    Keywords: Amoebocytes ; Globular cells ; Pulmonates ; Cell coat ; Endocytosis ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The cell coat of the amoebocytes and globular cells occurring in the connective tissue of Helix pomatia and Cepaea nemoralis was studied with colloidal iron, Thorotrast, ruthenium red and Alcian blue methods. The positive reactions of the entire cell surface of amoebocytes to these cationic dyes indicate the presence of an acid sialic-glycoprotein. The cell coat of the invaginations of globular cells proved to be distinct from the remainder cell surface since it has shown the strongest reaction of ruthenium red. The importance of the cell coat in the mechanism of endocytosis is discussed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0878
    Keywords: Connective Tissue ; Gastropoda ; Uptake of Ferritin and Trypan Blue ; Light- and Electron-Microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Untersuchungen des Bindegewebes der stylommatophoren Pulmonaten Helix pomatia and Cepaea nemoralis zeigen, daß die Blasenzellen des Bindegewebes befähigt sind, Substanzen aus der Hämolymphe aufzunehmen. Licht- und elektronenmikroskopische Untersuchungen ausgewählter Bindegewebsbereiche, die in bestimmten Zeitintervallen nach der Injektion von Trypanblau oder Ferritin in die Körperhöhle präpariert wurden (Stufenuntersuchungen), ergaben, daß — mit Ausnahme einiger Blutzellen — ausschließlich die Blasenzellen die injizierten Substanzen aufgenommen hatten. Weder andere Bindegewebszellen noch die Zellen von Organen (u.a. Gonaden, Schlundringganglien), die von Bindegewebe umgeben werden, enthielten diese Substanzen oder hatten sie akkumuliert. Die elektronenmikroskopischen Aufnahmen zeigen, daß die Aufnahme von Ferritin in die Blasenzellen wahrscheinlich durch Pinocytose erfolgt.
    Notes: Summary Investigations of the connective tissue of the stylommatophoran pulmonates Helix pomatia and Cepaea nemoralis have demonstrated, that so-called “globular cells” have the capability for the uptake of substances out of the hemolymph. Light- and electron-microscopic investigations of pieces of connective tissues fixed at different intervals after the injection of Trypane Blue or Ferritin into the cavity of the body give striking evidence for the uptake of these substances exclusively into the globular cells (with the exception of some blood cells). Neither other connective tissue cells nor cells of the organs (e.g. gonads, central nervous ganglions) surrounded by connective tissue incorporate or accumulate the injected substances. The uptake of Ferritin into the cytoplasm of the “globular cells”, normally filled with a high amount of glycogen, takes place by pinocytosis.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 137 (1973), S. 281-292 
    ISSN: 1432-0878
    Keywords: Amoebocytes, globular cells ; Connective tissue ; Gastropoda ; Endocytosis ; Selective uptake of foreign particles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Amoebozyten und Blasenzellen im Bindegewebe von Cepaea nemoralis zeigen deutliche Unterschiede in ihrer Endozytosefähigkeit. Grobe Partikeln wie Latexkugeln und Erythrozyten werden von den Amoebozyten endozytiert. Kleine Moleküle wie Ferritin und Hämoglobin werden hauptsächlich in den Blasenzellen akkumuliert, können aber auch von Amoebozyten aufgenommen werden. Dasselbe Endozytoseverhalten ist bei beiden Zellen zu beobachten, wenn Latex und Ferritin nacheinander in bestimmtem Zeitabstand angeboten werden. Die unterschiedliche Affinität der Amoebozyten und Blasenzellen zu den injizierten Fremdstoffen kann einmal durch ihre morphologische Oberflächendifferenzierung bedingt sein, zum anderen könnte ein funktionelles Zusammenwirken der Zellen im Sinne einer Arbeitsteilung vorliegen.
    Notes: Summary Amoebocytes and globular cells in the connective tissue of Cepaea nemoralis vary in the endocytotic incorporation of foreign materials of different size. Only the amoebocytes take up the latex beads and the red blood cells. However most of the injected ferritin and hemoglobin is ingested by the globular cells; a limited endocytotic capacity has been observed for these molecules by the amoebocytes. The results are the same, even though latex beads and ferritin are injected successively in definite intervals. Therefore the different affinity of amoebocytes and globular cells to foreign particles can not depend only on the morphological differentiation of their cell surfaces.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0009-286X
    Keywords: Phasengrenzfläche ; Blasensäule ; Stofftransport ; Mikrosonde. Leitfähigkeit ; Methanol ; Natriumsulfat ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 208 (1980), S. 371-387 
    ISSN: 1432-0878
    Keywords: Lobula complex ; Visual interneurons ; Ultrastructure ; Cobalt-impregnations ; Electron microscopy ; Diptera (Calliphora erythrocephala)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The synaptic organization of three classes of cobalt-filled and silver-intensified visual interneurons in the lobula complex of the blowfly Calliphora (Col A cells, horizontal cells and vertical cells) was studied electron microscopically. The Col A cells are regularly spaced, columnar, small field neurons of the lobula, which constitute a plexus of arborizations at the posterior surface of the neuropil and the axons of which terminate in the ventrolateral protocerebrum. They show postsynaptic specializations in the distal layer of their lobula-arborizations and additional presynaptic sites in a more proximal layer; their axon terminals are presynaptic to large descending neurons projecting into the thoracic ganglion. The horizontal and vertical cells are giant tangential neurons, the arborizations of which cover the anterior and posterior surface of the lobula plate, respectively, and which terminate in the perioesophageal region of the protocerebrum. Both classes of these giant neurons were found to be postsynaptic in the lobula plate and pre- and postsynaptic at their axon terminals and axon collaterals. The significance of these findings with respect to the functional properties of the neurons investigated is discussed.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0009-286X
    Keywords: Blasensäule ; Strömung ; Meßtechnik ; Heißfilm-Anemometrie ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 57 (1985), S. 474-475 
    ISSN: 0009-286X
    Keywords: Blasensäule ; Hydrodynamik ; axiale Vermischung ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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