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  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructure and cytochemistry of circulating erythrocytes during the annual cycle of Rana esculenta L. (1992)
    Springer
    Comparative clinical pathology 2 (1992), S. 166-169 
    Details
    ISSN: 1433-2981
    Keywords: Erythrocytes ; Flow cytometry ; Frog hibernation ; Image analysis ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Morphometrical (image analysis of cell and nuclear shape factor), morphological (electron microscopy) and cytochemical (acridine orange fluoro-chromasia and propidium iodide-DNA flow cytometry) features of circulating red blood cells were investigated during two periods of the annual cycle of Rana esculenta: the active phase (July) and the underground hibernating phase (January). The results showed that the hibernating phase is marked by more homogeneity of the red cells, both at nuclear (strongly condensed chromatin) and cytoplasmic level (loss of intact organelles and acridine orange fluorochromasia). The almost complete disappearance of the ‘immature’ erythrocytes from the circulation, during the hibernating phase, should be related to a decrease of haemopoietic activity and to an increase of life span accompanied by uncommon storage in different organs both at vascular and intracellular level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00426172
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Morphohistochemical changes of the blood cells in the hibernating frog (Rana esculenta L.) (1991)
    Springer
    Comparative clinical pathology 1 (1991), S. 220-223 
    Details
    ISSN: 1433-2981
    Keywords: Frog hibernation ; Blood cells ; Morphocytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Some morphological features (degree of nuclear segmentation in neutrophils and eosinophils), histochemical patterns (DHFR, LDH, G6PDH) and, in addition, the nucleic acid distribution (DNA, RNA with acridine orange) in the peripheral blood cells of Rana esculenta, during the hibernation phase were investigated. All the observed parameters varied significantly in the frog during hibernation in comparison with the active period. The most evident changes were an increase in the nuclear segmentation of the neutrophils and a lower activity of the histochemically demonstrable DHFR and LDH, probably due to cell ageing. These findings suggest that, in hibernating frogs, there is an increase in the life span of the peripheral blood cells as a consequence of a reduced metabolic activity and a slowing of haematopoiesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235375
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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