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  • 1970-1974  (5)
  • Ependyma  (3)
  • 2. Man  (1)
  • Electron microscopy  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Scanning electron microscopy of the human cerebral ventricular system (1973)
    Springer
    Cell & tissue research 139 (1973), S. 61-68 
    Details
    ISSN: 1432-0878
    Keywords: Fourth ventricle ; Human ; Ependyma ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Scanning electron microscopy was used to assess the ultrastructural differences exhibited by the varigated ependymal lining of the near-term human fetal 4th ventricle. The central portion of the fourth ventricular floor, including the median sulcus is punctuated by numerous clumps of cilia. The density of cilia here is not as great as that described for other regions of the human cerebral ventricular system; accordingly, underlying substructure can be noted. There are distinct differences between ependymas that line the floor of the fourth ventricle with those of the adjacent area postrema. The latter region possesses not cilia, but instead exhibits a dense knap of microvilli. The ultra-architecture of the choroid plexus is relatively similar to that of other circumventricular organs with the exception that it possesses small isolated groups of cilia as well as microvilli. These findings are discussed with respect to the dynamics of local CSF movement and flow, ependymoabsorption and ependymosecretion
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307461
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    In vitro analysis of the cellular localization of luteinizing hormone releasing factor (LRF) in the basal hypothalamus of the rat (1974)
    Springer
    Cell & tissue research 149 (1974), S. 371-378 
    Details
    ISSN: 1432-0878
    Keywords: LRF ; Hypothalamic localization ; Rat ; Ependyma ; Glia ; Light and electron microscopic Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Light and electron microscopic autoradiographic analysis of the medial basal hypothalamus of rat brains incubated for 30 and 60 minutes in tritiated luteinizing releasing factor (3H-LRF) revealed selective uptake in the form of silver grains over specialized ependyma (tanycytes) and perivascular glial cells in the palisade-contact zone of the median eminence. The functional capacity of tanycytes and glia are discussed in light of these data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226771
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Scanning electron microscopy of the third ventricle of sheep (1973)
    Springer
    Cell & tissue research 136 (1973), S. 169-176 
    Details
    ISSN: 1432-0878
    Keywords: Cerebral ventricles ; Ependyma ; Sheep ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Scanning electron microscopy of the third ventricle of sheep demonstrates areas of ciliated ependymal cells at the dorsal and middle third. The cilia of the dorsal portion of the ventricle have biconcave discs that are attached to each cilium by a slender stalk. The lower third and floor of the ventricular wall, as well as the pineal recess, are largely covered by ependymal cells that possess numerous microvilli with only a few isolated cilia scattered along cell surfaces. The infundibular recess is papillated with apical blebs of the ependymal cells that project into the lumen of the recess. Measurements of these surface elements indicate an average diameter of 0.28 μ for cilia, 0.10 μ for microvilli and 0.50 μ for the apical blebs of the infundibular recess. The functional significance of the regional differences in surface structures is discussed in relation to cerebrospinal fluid movement, ependymoabsorption and ependymosecretion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307437
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The ventricular system in neuroendocrine mechanisms (1974)
    Springer
    Cell & tissue research 154 (1974), S. 1-16 
    Details
    ISSN: 1432-0878
    Keywords: Ventricle ; Tanycytes ; Monoamine transport ; Autoradiography ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary This investigation has dealt with a light and electron microscopic autoradiographic analysis of the median eminence of the rat following intraventricular infusion of 3H-dopamine. This study has demonstrated that 3H-dopamine, once infused into the mammalian cerebral ventricular system, is rapidly and selectively absorbed by tanycytes and transported to the contact zone within 5 minutes after ventricular infusion. Certain axon terminals in the ependymal, hypendymal, and palisade-contact zones selectively sequester 3H-dopamine as do subpopulations of arcuate neurons. This picture of intense labelling of neurons and axon terminals is discussed with respect to monoaminergic re-uptake mechanisms. Uptake and transport of 3H-DA by tanycytes is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221067
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Man's impact on a newly formed reservoir (1974)
    Springer
    Hydrobiologia 45 (1974), S. 185-197 
    Details
    ISSN: 1573-5117
    Keywords: 1. Reservoir ; 2. Man ; 3. Eutrophication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A newly formed reservoir in the southwestern part of the United States was analyzed for man's impact on the eutrophication of the impoundment. The analysis of the 14C net productivity (mg 12C/m2 per day) indicated that the area studied was naturally eutrophic. Significant differences in net production were observed among the sites, as the area where man's recreational activities are highly concentrated had a significantly higher production rate than the other sites investigated. Mean monthly estimate of production for all the sites, and monthly and yearly estimates for the area studied are also included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014001
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    Paper (German National Licenses)
    Fulltext
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