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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Cancer Genetics and Cytogenetics 47 (1990), S. 83-87 
    ISSN: 0165-4608
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 71 (1986), S. 703-707 
    ISSN: 1432-2242
    Keywords: Nucleolus organizer ; Chromomycin A3 ; Fluorescence ; Salmo gairdneri ; Salmo trutta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The karyotypes of the rainbow trout (Salmo gairdneri R.) and the brown trout (Salmo trutta L.) were analyzed by means of silver staining and the chromomycin A3/distamycin A/DAPI fluorescence banding technique. The nucleolus organizer regions (NORs) were localized at the secondary constrictions of chromosome no. 14 in S. gairdneri and of chromosome no. 10 in S. trutta. Additional silver positive dots were observed at or close to several centromeres in S. gairdneri. Brilliant chromomycin A3 (CMA3) fluorescence heterochromatin blocks were localized on both sides of the nucleolar constrictions in S. gairdneri. A polymorphic CMA3 positive band was detected close to the NORs of S. trutta. No distamycin A/DAPI intense heterochromatin blocks were detected in the genomes of the two Salmo species investigated.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 76 (1988), S. 45-53 
    ISSN: 1432-2242
    Keywords: Heterochromatin ; DAPI/actinomycin D ; Salmo gairdneri R. ; Salmo trutta fario L. ; Salvelinus fontinalis M.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The heterochromatins of rainbow trout (Salmo gairdneri R.), brown trout (Salmo trutta fario L.) and brook trout (Salvelinus fontinalis M.) were characterized by sequential chromomycin A3/distamycin A/DAPI (CDD) and DAPI/actinomycin D (DAPI/AmD) fluorescence. On most biarmed chromosomes, an equilocal localization of prominent DAPI/AmD positive, chromomycin A3 negative, AT-rich blocks at the centromeres were observed in all three species. Band karyotypes of the three species were established. In rainbow trout, several DAPI/AmD positive heterochromatin blocks behaved positive in a silver-staining method. Mitotic and interphase studies proved the presence of inter-individual NOR variation in brown trout. The NORs of brook trout were localized on chromosomes 5, 10, 14, 15 and 29.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The chromosomes of the European Percidae (Lucioperca lucioperca L., Gymnocephalus cernuus L., Gymnocephalus schraetser L. and Perca fluviatilis L.) were analyzed by means of silver staining chromomycin A3/distamycin A/DAPI and DAPI/actinomycin D fluorescence banding techniques. The nucleolus organizer regions (NORs) were localized at the satellite stalks of chromosome no. 16 in Lucioperca lucioperca and Perca fluviatilis, and of chromosome no. 18 in both Gymnocephalus species. Bright chromomycin A3 fluorescence clusters were associated with them. Bright distamycin A-DAPI and DAPI/actinomycin D heterochromatic blocks were detected in Lucioperca lucioperca and the Gymnocephalus species.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The karyotype of the perch (Percafluviatilis L.) was analysed by means of silver-staining, the chromomyc in A/3 Distamycin A/DAPI and Actinomycin D fluorescence technique in order to locate active NORs and to selectively highlight certain heterochromatic regions. The ribosomal RNA genes are localized at the secondary constrictions of the short arms of chromosomes no. 16. Additionally, bright chromomycin fluorescence was observed in the same regions. No DAPI/ Distamycin A bright heterochromatic block was detected in the perch karyotype.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Genetica 69 (1986), S. 111-118 
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ribosomal RNA gene expression in the genomes of evolutionary diploid (Scardinius erythrophthalmus, Leucaspius delineatus, Tinca tinca) and polyploid species (Cyprinus carpio, Carassius carassius, Carassius auratus gibelio, Carassius auratus auratus) of Cyprinidae has been investigated by means of a silver nitrate technique. The diploid species investigated exhibited only one pair of chromosomes with nucleolus organizers (NOR). Higher numbers of rRNA-expressing chromosomal sites in several evolutionary polyploid species (Carassins) gave evidence against a complete functional diploidization, at least with regard to the NOR bearing chromosomes in these species. The NORs displayed a heterochromatic brilliant chromomycin A3 fluorescence. No distamycin-A/DAPI-bright heterochromatic blocks were detected in the genomes of the Cyprinidae.
    Type of Medium: Electronic Resource
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