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  • Key words: Lake sediments, redox indicators, trace metals, iron, manganese.  (1)
  • Neurohypophysis (Rat)  (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
    Ultrastructural evidence for sinusoid spaces and coupling between pituicytes in the rat (1975)
    Springer
    Cell & tissue research 161 (1975), S. 33-45 
    Details
    ISSN: 1432-0878
    Keywords: Neurohypophysis (Rat) ; Pituicytes-Gap and tight junctions ; Zonula occludens ; Freeze-etching electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pericapillary palisade of the rat neurohypophysis was examined by means of thin-section and freeze-etch electron-microscopy. Special attention was given to pituicyte processes intermingled with neurosecretory terminals. These processes are identified by the presence of lipid droplets and ribosomes. Extracellular spaces are conspicuously enlarged in circumscribed regions between fingerlike protrusions of pituicyte processes. Neurosecretory axons seem to have free access to these enlarged spaces. Zonulae occludentes often combined with small gap junctions are found at the border of these sinusoid spaces. Gap junctions and occasionally intermediate junctions are seen between pituicyte processes. The topographic relationship and the functional significance of these structural features remain to be further elucidated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222112
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    Paper (German National Licenses)
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