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  • Articles: DFG German National Licenses  (3)
  • 1990-1994  (1)
  • 1975-1979  (2)
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  • Articles: DFG German National Licenses  (3)
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Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Visualization of centriole-bodies using silver stain (1977)
    Springer
    Chromosoma 65 (1977), S. 9-20 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Duplicate staining of human metaphase chromosomes, first with Giemsa followed by silver, revealed the presence of two small silver-stained bodies not seen in the Giemsa stained metaphases. Similar bodies were subsequently found in the metaphases of several animal groups. The size, structure, spatial relationships to the nucleus, behavior throughout the cell cycle, and apparent universal presence of these bodies suggest that they are either centrioles or associated centriolar structures. These centriole-bodies can be seen throughout the cell cycle, even in hypotonically spread C-metaphase chromosome plates. The silver stain procedure allows enough resolution to distinguish parent and daughter centriole-bodies at interphase, thus permitting visualization of the replication, maturation and separation stages of these bodies with the light microscope.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293127
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Silver stain reveals nucleolus organizer regions on a satellited Yq chromosome (1978)
    Springer
    Human genetics 〈Berlin〉 42 (1978), S. 245-250 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Chromosomes from a patient with a satellited Yq were stained with a silver procedure that differentially stains nucleolus organizer regions. The Yqs stained heavily in all cells examined, indicating the presence of ribosomal cistrons at this region. The Yqs also entered into satellite associations with the D and G group chromosomes at a frequency greater than would be expected through chance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00291303
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Endothermy in fishes: a phylogenetic analysis of constraints, predispositions, and selection pressures (1994)
    Springer
    Environmental biology of fishes 40 (1994), S. 283-302 
    Details
    ISSN: 1573-5133
    Keywords: Endothermy ; Phylogeny ; Character evolution ; Scombroidei ; Tunas ; Billfishes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Endothermy, the ability to raise body temperature by internal heat production, is unusual in teleost fishes and has only been documented within one suborder, the Scombroidei. Two separate modes of endothermy have evolved in the scombroidei; tunas warm their muscles, brain and viscera using heat exchangers in the circulation to these metabolically active tissues while billfishes and one primitive mackerel have a thermogenic organ situated beneath the brain. Both modes of endothermy emphasize common themes. Large body size coupled with heat exchangers are necessary to reduce convective and conductive heat exchange. A tissue with a high oxidative capacity is required for heat generation. Studies based upon morphology and mitochondrial DNA analyses indicate that endothermy has evolved independently at least three times within the scombroid lineage. Mapping of-morphological and physiological traits on a molecular phylogeny for scombroids provides evidence of selective pressures favoring evolution of diverse endothermic styles. The new results suggest anatomical constraints prevent most fish from using the tuna form of endothermy and indicate a possible linkage between endothermy and locomotory style (thunniform or sub-carangiform).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00002518
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    Paper (German National Licenses)
    Fulltext
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