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  • Articles: DFG German National Licenses  (2)
  • 1985-1989  (2)
  • Dioscorea rotundata  (1)
  • lipofuscin-laden vacuoles  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructure of electrophysiologically identified human sinoatrial nodes (1988)
    Springer
    Basic research in cardiology 83 (1988), S. 401-409 
    Details
    ISSN: 1435-1803
    Keywords: humansinus node ultrastructure ; inappropriate sinus tachycardia ; sinus node extirpation ; lipofuscin-laden vacuoles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The ultrastructure of freshly excised human sinus node tissue was studied. In three female patients (ages 20, 30, and 36 years) medically refractory disabling episodes of inappropriate sinus tachycardia were surgically treated by extirpation of the sinus node. Each patient underwent intraoperative electrophysiological mapping to determine the area of earliest atrial activation. This area corresponded anatomically to the region of the sinoatrial node and was excised in each patient, the defect repaired using a pericardial patch. The freshly excised SA nodes underwent ultrastructural study. Three types of myocardial cells were identified: pacemaker or polygonal cells with clear cytoplasm, few mitochondria and sparse numbers of contractile elements (P cells); a transitional cell with slightly increased numbers of myofibrils (T cells); and typical atrial myocardial cells with normal numbers of contractile elements. These cell types have previously been identified in post-mortem studies of presumed SA node. The current study confirms the cell types in electrophysiologically documented SA nodes. The one abnormal finding observed in transitional cells in all patients was an increased number of lipofuscin-laden vacuoles. These vacuoles are considered a sign of cell degeneration and their occurrence was totally unexpected in these young adults. In summary, ultrastructural study of electrophysiologically documented human SA nodes confirmed the cell types identified in post-mortem studies. Furthermore, lipofuscin-laden vacuoles were increased in these three patients and this finding may serve as an ultrastructural marker associated with the syndrome of inappropriate sinus tachycardia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02005826
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Studies on the relationship of Dioscorea cayenensis and Dioscorea rotundata cultivars (1986)
    Springer
    Euphytica 35 (1986), S. 733-739 
    Details
    ISSN: 1573-5060
    Keywords: Dioscorea cayenensis ; yellow yam ; Dioscorea rotundata ; white yam ; single linkage ; cluster analysis principal components analysis ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Two numerical taxonomic techniques, single linkage cluster analysis (SLCA) and principal components analysis (PCA) were used to study the relationship between Dioscorea cayenensis and D. rotundata cultivars. The study was prompted by the confusion in the taxonomy of the two taxa. Twenty-two cultivars (14 of D. rotundata and 8 of D. cayenensis) were collected and planted under the same environmental conditions for 3 successive years. Altogether, 76 characters, which include morphological, anatomical and ecological characters were observed and coded for analyses. Results from both methods agreed and showed that two groups of taxa exist. The discrimination between groups and description of differences between groups were more strongly marked from the PCA than in the SLCA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028581
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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