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  • Ependyma  (1)
  • Exocytosis, endocytosis  (1)
  • Gap junctions  (1)
  • Key words: Lake sediments, redox indicators, trace metals, iron, manganese.  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Sedimentary profiles of Fe, Mn, V, Cr, As and Mo as indicators of benthic redox conditions in Baldeggersee (1997)
    Springer
    Aquatic sciences 59 (1997), S. 345-361 
    Details
    ISSN: 1420-9055
    Keywords: Key words: Lake sediments, redox indicators, trace metals, iron, manganese.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Concentration profiles of Mg, K, La, Fe, Mn, V, Cr, As and Mo were determined in samples from a freeze core taken at the deepest site of Baldeggersee in 1993. The special coring technique allowed an exact dating of the sediment samples and an annual resolution of the profiles. Long term changes in benthic redox conditions produce diagnostic trends in several metal profiles. Fe, As and Mn enrichments trace the onset of anoxia at the deepest site of the lake. High values of Mo concentrations and Cr/V ratios indicate periods of stable anoxic conditions in a meromictic hypolimnion. A comparison of oxygen time series with metal profiles between 1950 and 1990 indicates that Mn reacts sensitively to large seasonal variations of deep-water oxygen concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000270050019
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  • 2
    Electronic Resource
    Electronic Resource
    Specific arrangements of membrane particles at sites of exo-endocytosis in the freeze-etched neurohypophysis (1976)
    Springer
    Cell & tissue research 165 (1976), S. 317-325 
    Details
    ISSN: 1432-0878
    Keywords: Exocytosis, endocytosis ; Freeze-etching ; Electron microscopy ; Membrane particles, rosettes ; Neurohypophysis, neurosecretion ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Images have been obtained from freeze-etch replicas of neurohypophyses which are consistent with the view that orderly arranged aggregates of membrane particles occur in regions where fragments of membrane are being added to and taken away from the plasma membrane during secretion. Aggregates of particles included rosette-like and necklace-like patterns similar to those described by other authors at sites of exocytosis and endocytosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222436
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  • 3
    Electronic Resource
    Electronic Resource
    Neuritic growth cone and ependymal gap junctions in the feline subfornical organ during early development (1977)
    Springer
    Cell & tissue research 181 (1977), S. 27-36 
    Details
    ISSN: 1432-0878
    Keywords: Central nervous system (Subfornical organ) ; Gap junctions ; Neuritic growth cones ; Ependyma ; Electron microscopy ; Freezeetching
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Intercellular contacts in the subfornical organ (SFO) of kittens 3, 16, and 29 days old were studied in thin sections and by the freeze-etch method. Gap junctions appeared between growing nerve processes and target cells. The junctions were interspersed between immature synapses lacking mitochondria as well as full preand postsynaptic membrane specializations. Gap junctions were seen on filopodia as well as on more mature processes. The morphology of these junctions was typical of those described earlier but they were of small size (0.2–0.3 μm). Gap junctions of peculiar form were also seen between ependymal elements in the SFO at 16 days. These were of large size (0.5–0.8 μm) and were often of segmented character. This segmentation consisted of bands 3–4 particles in width with a center-to-center spacing of 90 nm with particle free corridors between corresponding to the width of about two rows of particles. The margin of the group might be circumscribed by a row of particles. Although gap junctions of large size were seen between ependymal cells in thin section, features corresponding to the particle free corridors have not been observed to date.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222772
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